Merge pull request #31709 from dnephin/better-errors

Replace fmt.Errorf() with errors.Errorf() in the cli

cobra.go

@@ -5,6 +5,7 @@ import (
 	"strings"
 
 	"github.com/docker/docker/pkg/term"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 )
 
@@ -51,7 +52,7 @@ var helpCommand = &cobra.Command{
 	RunE: func(c *cobra.Command, args []string) error {
 		cmd, args, e := c.Root().Find(args)
 		if cmd == nil || e != nil || len(args) > 0 {
-			return fmt.Errorf("unknown help topic: %v", strings.Join(args, " "))
+			return errors.Errorf("unknown help topic: %v", strings.Join(args, " "))
 		}
 
 		helpFunc := cmd.HelpFunc()

command/bundlefile/bundlefile.go

@@ -2,8 +2,9 @@ package bundlefile
 
 import (
 	"encoding/json"
-	"fmt"
 	"io"
+
+	"github.com/pkg/errors"
 )
 
 // Bundlefile stores the contents of a bundlefile
@@ -39,12 +40,12 @@ func LoadFile(reader io.Reader) (*Bundlefile, error) {
 	if err := decoder.Decode(bundlefile); err != nil {
 		switch jsonErr := err.(type) {
 		case *json.SyntaxError:
-			return nil, fmt.Errorf(
+			return nil, errors.Errorf(
 				"JSON syntax error at byte %v: %s",
 				jsonErr.Offset,
 				jsonErr.Error())
 		case *json.UnmarshalTypeError:
-			return nil, fmt.Errorf(
+			return nil, errors.Errorf(
 				"Unexpected type at byte %v. Expected %s but received %s.",
 				jsonErr.Offset,
 				jsonErr.Type,

command/cli.go

@@ -1,7 +1,6 @@
 package command
 
 import (
-	"errors"
 	"fmt"
 	"io"
 	"net/http"
@@ -21,6 +20,7 @@ import (
 	dopts "github.com/docker/docker/opts"
 	"github.com/docker/go-connections/sockets"
 	"github.com/docker/go-connections/tlsconfig"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"golang.org/x/net/context"
 )

command/container/attach.go

@@ -1,7 +1,6 @@
 package container
 
 import (
-	"errors"
 	"io"
 	"net/http/httputil"
 
@@ -10,6 +9,7 @@ import (
 	"github.com/docker/docker/cli"
 	"github.com/docker/docker/cli/command"
 	"github.com/docker/docker/pkg/signal"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"golang.org/x/net/context"
 )

command/container/cp.go

@@ -1,8 +1,6 @@
 package container
 
 import (
-	"errors"
-	"fmt"
 	"io"
 	"os"
 	"path/filepath"
@@ -13,6 +11,7 @@ import (
 	"github.com/docker/docker/cli/command"
 	"github.com/docker/docker/pkg/archive"
 	"github.com/docker/docker/pkg/system"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"golang.org/x/net/context"
 )
@@ -227,7 +226,7 @@ func copyToContainer(ctx context.Context, dockerCli *command.DockerCli, srcPath,
 		content = os.Stdin
 		resolvedDstPath = dstInfo.Path
 		if !dstInfo.IsDir {
-			return fmt.Errorf("destination \"%s:%s\" must be a directory", dstContainer, dstPath)
+			return errors.Errorf("destination \"%s:%s\" must be a directory", dstContainer, dstPath)
 		}
 	} else {
 		// Prepare source copy info.

command/container/create.go

@@ -14,6 +14,7 @@ import (
 	apiclient "github.com/docker/docker/client"
 	"github.com/docker/docker/pkg/jsonmessage"
 	"github.com/docker/docker/registry"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"github.com/spf13/pflag"
 	"golang.org/x/net/context"
@@ -118,7 +119,7 @@ func (cid *cidFile) Close() error {
 		return nil
 	}
 	if err := os.Remove(cid.path); err != nil {
-		return fmt.Errorf("failed to remove the CID file '%s': %s \n", cid.path, err)
+		return errors.Errorf("failed to remove the CID file '%s': %s \n", cid.path, err)
 	}
 
 	return nil
@@ -126,7 +127,7 @@ func (cid *cidFile) Close() error {
 
 func (cid *cidFile) Write(id string) error {
 	if _, err := cid.file.Write([]byte(id)); err != nil {
-		return fmt.Errorf("Failed to write the container ID to the file: %s", err)
+		return errors.Errorf("Failed to write the container ID to the file: %s", err)
 	}
 	cid.written = true
 	return nil
@@ -134,12 +135,12 @@ func (cid *cidFile) Write(id string) error {
 
 func newCIDFile(path string) (*cidFile, error) {
 	if _, err := os.Stat(path); err == nil {
-		return nil, fmt.Errorf("Container ID file found, make sure the other container isn't running or delete %s", path)
+		return nil, errors.Errorf("Container ID file found, make sure the other container isn't running or delete %s", path)
 	}
 
 	f, err := os.Create(path)
 	if err != nil {
-		return nil, fmt.Errorf("Failed to create the container ID file: %s", err)
+		return nil, errors.Errorf("Failed to create the container ID file: %s", err)
 	}
 
 	return &cidFile{path: path, file: f}, nil

command/container/diff.go

@@ -1,12 +1,12 @@
 package container
 
 import (
-	"errors"
 	"fmt"
 
 	"github.com/docker/docker/cli"
 	"github.com/docker/docker/cli/command"
 	"github.com/docker/docker/pkg/archive"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"golang.org/x/net/context"
 )

command/container/export.go

@@ -1,11 +1,11 @@
 package container
 
 import (
-	"errors"
 	"io"
 
 	"github.com/docker/docker/cli"
 	"github.com/docker/docker/cli/command"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"golang.org/x/net/context"
 )

command/container/kill.go

@@ -1,12 +1,12 @@
 package container
 
 import (
-	"errors"
 	"fmt"
 	"strings"
 
 	"github.com/docker/docker/cli"
 	"github.com/docker/docker/cli/command"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"golang.org/x/net/context"
 )

command/container/opts.go

@@ -18,6 +18,7 @@ import (
 	"github.com/docker/docker/pkg/signal"
 	runconfigopts "github.com/docker/docker/runconfig/opts"
 	"github.com/docker/go-connections/nat"
+	"github.com/pkg/errors"
 	"github.com/spf13/pflag"
 )
 
@@ -301,7 +302,7 @@ func parse(flags *pflag.FlagSet, copts *containerOptions) (*containerConfig, err
 	// Validate the input mac address
 	if copts.macAddress != "" {
 		if _, err := opts.ValidateMACAddress(copts.macAddress); err != nil {
-			return nil, fmt.Errorf("%s is not a valid mac address", copts.macAddress)
+			return nil, errors.Errorf("%s is not a valid mac address", copts.macAddress)
 		}
 	}
 	if copts.stdin {
@@ -317,7 +318,7 @@ func parse(flags *pflag.FlagSet, copts *containerOptions) (*containerConfig, err
 
 	swappiness := copts.swappiness
 	if swappiness != -1 && (swappiness < 0 || swappiness > 100) {
-		return nil, fmt.Errorf("invalid value: %d. Valid memory swappiness range is 0-100", swappiness)
+		return nil, errors.Errorf("invalid value: %d. Valid memory swappiness range is 0-100", swappiness)
 	}
 
 	var binds []string
@@ -368,7 +369,7 @@ func parse(flags *pflag.FlagSet, copts *containerOptions) (*containerConfig, err
 	// Merge in exposed ports to the map of published ports
 	for _, e := range copts.expose.GetAll() {
 		if strings.Contains(e, ":") {
-			return nil, fmt.Errorf("invalid port format for --expose: %s", e)
+			return nil, errors.Errorf("invalid port format for --expose: %s", e)
 		}
 		//support two formats for expose, original format <portnum>/[<proto>] or <startport-endport>/[<proto>]
 		proto, port := nat.SplitProtoPort(e)
@@ -376,7 +377,7 @@ func parse(flags *pflag.FlagSet, copts *containerOptions) (*containerConfig, err
 		//if expose a port, the start and end port are the same
 		start, end, err := nat.ParsePortRange(port)
 		if err != nil {
-			return nil, fmt.Errorf("invalid range format for --expose: %s, error: %s", e, err)
+			return nil, errors.Errorf("invalid range format for --expose: %s, error: %s", e, err)
 		}
 		for i := start; i <= end; i++ {
 			p, err := nat.NewPort(proto, strconv.FormatUint(i, 10))
@@ -413,22 +414,22 @@ func parse(flags *pflag.FlagSet, copts *containerOptions) (*containerConfig, err
 
 	ipcMode := container.IpcMode(copts.ipcMode)
 	if !ipcMode.Valid() {
-		return nil, fmt.Errorf("--ipc: invalid IPC mode")
+		return nil, errors.Errorf("--ipc: invalid IPC mode")
 	}
 
 	pidMode := container.PidMode(copts.pidMode)
 	if !pidMode.Valid() {
-		return nil, fmt.Errorf("--pid: invalid PID mode")
+		return nil, errors.Errorf("--pid: invalid PID mode")
 	}
 
 	utsMode := container.UTSMode(copts.utsMode)
 	if !utsMode.Valid() {
-		return nil, fmt.Errorf("--uts: invalid UTS mode")
+		return nil, errors.Errorf("--uts: invalid UTS mode")
 	}
 
 	usernsMode := container.UsernsMode(copts.usernsMode)
 	if !usernsMode.Valid() {
-		return nil, fmt.Errorf("--userns: invalid USER mode")
+		return nil, errors.Errorf("--userns: invalid USER mode")
 	}
 
 	restartPolicy, err := runconfigopts.ParseRestartPolicy(copts.restartPolicy)
@@ -459,7 +460,7 @@ func parse(flags *pflag.FlagSet, copts *containerOptions) (*containerConfig, err
 		copts.healthRetries != 0
 	if copts.noHealthcheck {
 		if haveHealthSettings {
-			return nil, fmt.Errorf("--no-healthcheck conflicts with --health-* options")
+			return nil, errors.Errorf("--no-healthcheck conflicts with --health-* options")
 		}
 		test := strslice.StrSlice{"NONE"}
 		healthConfig = &container.HealthConfig{Test: test}
@@ -470,13 +471,13 @@ func parse(flags *pflag.FlagSet, copts *containerOptions) (*containerConfig, err
 			probe = strslice.StrSlice(args)
 		}
 		if copts.healthInterval < 0 {
-			return nil, fmt.Errorf("--health-interval cannot be negative")
+			return nil, errors.Errorf("--health-interval cannot be negative")
 		}
 		if copts.healthTimeout < 0 {
-			return nil, fmt.Errorf("--health-timeout cannot be negative")
+			return nil, errors.Errorf("--health-timeout cannot be negative")
 		}
 		if copts.healthRetries < 0 {
-			return nil, fmt.Errorf("--health-retries cannot be negative")
+			return nil, errors.Errorf("--health-retries cannot be negative")
 		}
 
 		healthConfig = &container.HealthConfig{
@@ -591,7 +592,7 @@ func parse(flags *pflag.FlagSet, copts *containerOptions) (*containerConfig, err
 	}
 
 	if copts.autoRemove && !hostConfig.RestartPolicy.IsNone() {
-		return nil, fmt.Errorf("Conflicting options: --restart and --rm")
+		return nil, errors.Errorf("Conflicting options: --restart and --rm")
 	}
 
 	// only set this value if the user provided the flag, else it should default to nil
@@ -653,7 +654,7 @@ func parse(flags *pflag.FlagSet, copts *containerOptions) (*containerConfig, err
 func parseLoggingOpts(loggingDriver string, loggingOpts []string) (map[string]string, error) {
 	loggingOptsMap := runconfigopts.ConvertKVStringsToMap(loggingOpts)
 	if loggingDriver == "none" && len(loggingOpts) > 0 {
-		return map[string]string{}, fmt.Errorf("invalid logging opts for driver %s", loggingDriver)
+		return map[string]string{}, errors.Errorf("invalid logging opts for driver %s", loggingDriver)
 	}
 	return loggingOptsMap, nil
 }
@@ -666,17 +667,17 @@ func parseSecurityOpts(securityOpts []string) ([]string, error) {
 			if strings.Contains(opt, ":") {
 				con = strings.SplitN(opt, ":", 2)
 			} else {
-				return securityOpts, fmt.Errorf("Invalid --security-opt: %q", opt)
+				return securityOpts, errors.Errorf("Invalid --security-opt: %q", opt)
 			}
 		}
 		if con[0] == "seccomp" && con[1] != "unconfined" {
 			f, err := ioutil.ReadFile(con[1])
 			if err != nil {
-				return securityOpts, fmt.Errorf("opening seccomp profile (%s) failed: %v", con[1], err)
+				return securityOpts, errors.Errorf("opening seccomp profile (%s) failed: %v", con[1], err)
 			}
 			b := bytes.NewBuffer(nil)
 			if err := json.Compact(b, f); err != nil {
-				return securityOpts, fmt.Errorf("compacting json for seccomp profile (%s) failed: %v", con[1], err)
+				return securityOpts, errors.Errorf("compacting json for seccomp profile (%s) failed: %v", con[1], err)
 			}
 			securityOpts[key] = fmt.Sprintf("seccomp=%s", b.Bytes())
 		}
@@ -693,7 +694,7 @@ func parseStorageOpts(storageOpts []string) (map[string]string, error) {
 			opt := strings.SplitN(option, "=", 2)
 			m[opt[0]] = opt[1]
 		} else {
-			return nil, fmt.Errorf("invalid storage option")
+			return nil, errors.Errorf("invalid storage option")
 		}
 	}
 	return m, nil
@@ -719,7 +720,7 @@ func parseDevice(device string) (container.DeviceMapping, error) {
 	case 1:
 		src = arr[0]
 	default:
-		return container.DeviceMapping{}, fmt.Errorf("invalid device specification: %s", device)
+		return container.DeviceMapping{}, errors.Errorf("invalid device specification: %s", device)
 	}
 
 	if dst == "" {
@@ -742,7 +743,7 @@ func validateDeviceCgroupRule(val string) (string, error) {
 		return val, nil
 	}
 
-	return val, fmt.Errorf("invalid device cgroup format '%s'", val)
+	return val, errors.Errorf("invalid device cgroup format '%s'", val)
 }
 
 // validDeviceMode checks if the mode for device is valid or not.
@@ -778,12 +779,12 @@ func validatePath(val string, validator func(string) bool) (string, error) {
 	var mode string
 
 	if strings.Count(val, ":") > 2 {
-		return val, fmt.Errorf("bad format for path: %s", val)
+		return val, errors.Errorf("bad format for path: %s", val)
 	}
 
 	split := strings.SplitN(val, ":", 3)
 	if split[0] == "" {
-		return val, fmt.Errorf("bad format for path: %s", val)
+		return val, errors.Errorf("bad format for path: %s", val)
 	}
 	switch len(split) {
 	case 1:
@@ -802,13 +803,13 @@ func validatePath(val string, validator func(string) bool) (string, error) {
 		containerPath = split[1]
 		mode = split[2]
 		if isValid := validator(split[2]); !isValid {
-			return val, fmt.Errorf("bad mode specified: %s", mode)
+			return val, errors.Errorf("bad mode specified: %s", mode)
 		}
 		val = fmt.Sprintf("%s:%s:%s", split[0], containerPath, mode)
 	}
 
 	if !path.IsAbs(containerPath) {
-		return val, fmt.Errorf("%s is not an absolute path", containerPath)
+		return val, errors.Errorf("%s is not an absolute path", containerPath)
 	}
 	return val, nil
 }
@@ -882,5 +883,5 @@ func validateAttach(val string) (string, error) {
 			return s, nil
 		}
 	}
-	return val, fmt.Errorf("valid streams are STDIN, STDOUT and STDERR")
+	return val, errors.Errorf("valid streams are STDIN, STDOUT and STDERR")
 }

command/container/opts_test.go

@@ -16,6 +16,7 @@ import (
 	"github.com/docker/docker/pkg/testutil/assert"
 	"github.com/docker/docker/runconfig"
 	"github.com/docker/go-connections/nat"
+	"github.com/pkg/errors"
 	"github.com/spf13/pflag"
 )
 
@@ -224,7 +225,7 @@ func compareRandomizedStrings(a, b, c, d string) error {
 	if a == d && b == c {
 		return nil
 	}
-	return fmt.Errorf("strings don't match")
+	return errors.Errorf("strings don't match")
 }
 
 // Simple parse with MacAddress validation
@@ -751,14 +752,14 @@ func callDecodeContainerConfig(volumes []string, binds []string) (*container.Con
 		w.Config.Volumes[v] = struct{}{}
 	}
 	if b, err = json.Marshal(w); err != nil {
-		return nil, nil, fmt.Errorf("Error on marshal %s", err.Error())
+		return nil, nil, errors.Errorf("Error on marshal %s", err.Error())
 	}
 	c, h, _, err = runconfig.DecodeContainerConfig(bytes.NewReader(b))
 	if err != nil {
-		return nil, nil, fmt.Errorf("Error parsing %s: %v", string(b), err)
+		return nil, nil, errors.Errorf("Error parsing %s: %v", string(b), err)
 	}
 	if c == nil || h == nil {
-		return nil, nil, fmt.Errorf("Empty config or hostconfig")
+		return nil, nil, errors.Errorf("Empty config or hostconfig")
 	}
 
 	return c, h, err

command/container/pause.go

@@ -1,12 +1,12 @@
 package container
 
 import (
-	"errors"
 	"fmt"
 	"strings"
 
 	"github.com/docker/docker/cli"
 	"github.com/docker/docker/cli/command"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"golang.org/x/net/context"
 )

command/container/port.go

@@ -7,6 +7,7 @@ import (
 	"github.com/docker/docker/cli"
 	"github.com/docker/docker/cli/command"
 	"github.com/docker/go-connections/nat"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"golang.org/x/net/context"
 )
@@ -64,7 +65,7 @@ func runPort(dockerCli *command.DockerCli, opts *portOptions) error {
 			}
 			return nil
 		}
-		return fmt.Errorf("Error: No public port '%s' published for %s", natPort, opts.container)
+		return errors.Errorf("Error: No public port '%s' published for %s", natPort, opts.container)
 	}
 
 	for from, frontends := range c.NetworkSettings.Ports {

command/container/rename.go

@@ -1,12 +1,12 @@
 package container
 
 import (
-	"errors"
 	"fmt"
 	"strings"
 
 	"github.com/docker/docker/cli"
 	"github.com/docker/docker/cli/command"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"golang.org/x/net/context"
 )
@@ -45,7 +45,7 @@ func runRename(dockerCli *command.DockerCli, opts *renameOptions) error {
 
 	if err := dockerCli.Client().ContainerRename(ctx, oldName, newName); err != nil {
 		fmt.Fprintln(dockerCli.Err(), err)
-		return fmt.Errorf("Error: failed to rename container named %s", oldName)
+		return errors.Errorf("Error: failed to rename container named %s", oldName)
 	}
 	return nil
 }

command/container/restart.go

@@ -1,13 +1,13 @@
 package container
 
 import (
-	"errors"
 	"fmt"
 	"strings"
 	"time"
 
 	"github.com/docker/docker/cli"
 	"github.com/docker/docker/cli/command"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"golang.org/x/net/context"
 )

command/container/rm.go

@@ -1,13 +1,13 @@
 package container
 
 import (
-	"errors"
 	"fmt"
 	"strings"
 
 	"github.com/docker/docker/api/types"
 	"github.com/docker/docker/cli"
 	"github.com/docker/docker/cli/command"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"golang.org/x/net/context"
 )

command/container/run.go

@@ -1,7 +1,6 @@
 package container
 
 import (
-	"errors"
 	"fmt"
 	"io"
 	"net/http/httputil"
@@ -18,6 +17,7 @@ import (
 	"github.com/docker/docker/pkg/promise"
 	"github.com/docker/docker/pkg/signal"
 	"github.com/docker/libnetwork/resolvconf/dns"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"github.com/spf13/pflag"
 	"golang.org/x/net/context"

command/container/start.go

@@ -1,7 +1,6 @@
 package container
 
 import (
-	"errors"
 	"fmt"
 	"io"
 	"net/http/httputil"
@@ -12,6 +11,7 @@ import (
 	"github.com/docker/docker/cli/command"
 	"github.com/docker/docker/pkg/promise"
 	"github.com/docker/docker/pkg/signal"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"golang.org/x/net/context"
 )
@@ -173,7 +173,7 @@ func startContainersWithoutAttachments(ctx context.Context, dockerCli *command.D
 	}
 
 	if len(failedContainers) > 0 {
-		return fmt.Errorf("Error: failed to start containers: %s", strings.Join(failedContainers, ", "))
+		return errors.Errorf("Error: failed to start containers: %s", strings.Join(failedContainers, ", "))
 	}
 	return nil
 }

command/container/stats.go

@@ -1,7 +1,6 @@
 package container
 
 import (
-	"errors"
 	"fmt"
 	"io"
 	"strings"
@@ -14,6 +13,7 @@ import (
 	"github.com/docker/docker/cli"
 	"github.com/docker/docker/cli/command"
 	"github.com/docker/docker/cli/command/formatter"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"golang.org/x/net/context"
 )

command/container/stats_helpers.go

@@ -2,7 +2,6 @@ package container
 
 import (
 	"encoding/json"
-	"errors"
 	"io"
 	"strings"
 	"sync"
@@ -12,6 +11,7 @@ import (
 	"github.com/docker/docker/api/types"
 	"github.com/docker/docker/cli/command/formatter"
 	"github.com/docker/docker/client"
+	"github.com/pkg/errors"
 	"golang.org/x/net/context"
 )
 

command/container/stop.go

@@ -1,13 +1,13 @@
 package container
 
 import (
-	"errors"
 	"fmt"
 	"strings"
 	"time"
 
 	"github.com/docker/docker/cli"
 	"github.com/docker/docker/cli/command"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"golang.org/x/net/context"
 )

command/container/unpause.go

@@ -1,12 +1,12 @@
 package container
 
 import (
-	"errors"
 	"fmt"
 	"strings"
 
 	"github.com/docker/docker/cli"
 	"github.com/docker/docker/cli/command"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"golang.org/x/net/context"
 )

command/container/update.go

@@ -1,7 +1,6 @@
 package container
 
 import (
-	"errors"
 	"fmt"
 	"strings"
 
@@ -10,6 +9,7 @@ import (
 	"github.com/docker/docker/cli/command"
 	"github.com/docker/docker/opts"
 	runconfigopts "github.com/docker/docker/runconfig/opts"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"golang.org/x/net/context"
 )

command/container/wait.go

@@ -1,12 +1,12 @@
 package container
 
 import (
-	"errors"
 	"fmt"
 	"strings"
 
 	"github.com/docker/docker/cli"
 	"github.com/docker/docker/cli/command"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"golang.org/x/net/context"
 )

command/formatter/formatter.go

@@ -2,13 +2,13 @@ package formatter
 
 import (
 	"bytes"
-	"fmt"
 	"io"
 	"strings"
 	"text/tabwriter"
 	"text/template"
 
 	"github.com/docker/docker/pkg/templates"
+	"github.com/pkg/errors"
 )
 
 // Format keys used to specify certain kinds of output formats
@@ -64,7 +64,7 @@ func (c *Context) preFormat() {
 func (c *Context) parseFormat() (*template.Template, error) {
 	tmpl, err := templates.Parse(c.finalFormat)
 	if err != nil {
-		return tmpl, fmt.Errorf("Template parsing error: %v\n", err)
+		return tmpl, errors.Errorf("Template parsing error: %v\n", err)
 	}
 	return tmpl, err
 }
@@ -85,7 +85,7 @@ func (c *Context) postFormat(tmpl *template.Template, subContext subContext) {
 
 func (c *Context) contextFormat(tmpl *template.Template, subContext subContext) error {
 	if err := tmpl.Execute(c.buffer, subContext); err != nil {
-		return fmt.Errorf("Template parsing error: %v\n", err)
+		return errors.Errorf("Template parsing error: %v\n", err)
 	}
 	if c.Format.IsTable() && c.header != nil {
 		c.header = subContext.FullHeader()

command/formatter/reflect.go

@@ -2,9 +2,10 @@ package formatter
 
 import (
 	"encoding/json"
-	"fmt"
 	"reflect"
 	"unicode"
+
+	"github.com/pkg/errors"
 )
 
 func marshalJSON(x interface{}) ([]byte, error) {
@@ -19,14 +20,14 @@ func marshalJSON(x interface{}) ([]byte, error) {
 func marshalMap(x interface{}) (map[string]interface{}, error) {
 	val := reflect.ValueOf(x)
 	if val.Kind() != reflect.Ptr {
-		return nil, fmt.Errorf("expected a pointer to a struct, got %v", val.Kind())
+		return nil, errors.Errorf("expected a pointer to a struct, got %v", val.Kind())
 	}
 	if val.IsNil() {
-		return nil, fmt.Errorf("expected a pointer to a struct, got nil pointer")
+		return nil, errors.Errorf("expected a pointer to a struct, got nil pointer")
 	}
 	valElem := val.Elem()
 	if valElem.Kind() != reflect.Struct {
-		return nil, fmt.Errorf("expected a pointer to a struct, got a pointer to %v", valElem.Kind())
+		return nil, errors.Errorf("expected a pointer to a struct, got a pointer to %v", valElem.Kind())
 	}
 	typ := val.Type()
 	m := make(map[string]interface{})
@@ -48,7 +49,7 @@ var unmarshallableNames = map[string]struct{}{"FullHeader": {}}
 // It returns ("", nil, nil) for valid but non-marshallable parameter. (e.g. "unexportedFunc()")
 func marshalForMethod(typ reflect.Method, val reflect.Value) (string, interface{}, error) {
 	if val.Kind() != reflect.Func {
-		return "", nil, fmt.Errorf("expected func, got %v", val.Kind())
+		return "", nil, errors.Errorf("expected func, got %v", val.Kind())
 	}
 	name, numIn, numOut := typ.Name, val.Type().NumIn(), val.Type().NumOut()
 	_, blackListed := unmarshallableNames[name]

command/formatter/service.go

@@ -1,7 +1,6 @@
 package formatter
 
 import (
-	"fmt"
 	"strings"
 	"time"
 
@@ -11,6 +10,7 @@ import (
 	"github.com/docker/docker/cli/command/inspect"
 	"github.com/docker/docker/pkg/stringid"
 	units "github.com/docker/go-units"
+	"github.com/pkg/errors"
 )
 
 const serviceInspectPrettyTemplate Format = `
@@ -147,7 +147,7 @@ func ServiceInspectWrite(ctx Context, refs []string, getRef inspect.GetRefFunc)
 			}
 			service, ok := serviceI.(swarm.Service)
 			if !ok {
-				return fmt.Errorf("got wrong object to inspect")
+				return errors.Errorf("got wrong object to inspect")
 			}
 			if err := format(&serviceInspectContext{Service: service}); err != nil {
 				return err

command/idresolver/idresolver.go

@@ -1,12 +1,11 @@
 package idresolver
 
 import (
-	"fmt"
-
 	"golang.org/x/net/context"
 
 	"github.com/docker/docker/api/types/swarm"
 	"github.com/docker/docker/client"
+	"github.com/pkg/errors"
 )
 
 // IDResolver provides ID to Name resolution.
@@ -46,7 +45,7 @@ func (r *IDResolver) get(ctx context.Context, t interface{}, id string) (string,
 		}
 		return service.Spec.Annotations.Name, nil
 	default:
-		return "", fmt.Errorf("unsupported type")
+		return "", errors.Errorf("unsupported type")
 	}
 
 }

command/image/build.go

@@ -28,6 +28,7 @@ import (
 	"github.com/docker/docker/pkg/urlutil"
 	runconfigopts "github.com/docker/docker/runconfig/opts"
 	units "github.com/docker/go-units"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"golang.org/x/net/context"
 )
@@ -166,14 +167,14 @@ func runBuild(dockerCli *command.DockerCli, options buildOptions) error {
 	case urlutil.IsURL(specifiedContext):
 		buildCtx, relDockerfile, err = build.GetContextFromURL(progBuff, specifiedContext, options.dockerfileName)
 	default:
-		return fmt.Errorf("unable to prepare context: path %q not found", specifiedContext)
+		return errors.Errorf("unable to prepare context: path %q not found", specifiedContext)
 	}
 
 	if err != nil {
 		if options.quiet && urlutil.IsURL(specifiedContext) {
 			fmt.Fprintln(dockerCli.Err(), progBuff)
 		}
-		return fmt.Errorf("unable to prepare context: %s", err)
+		return errors.Errorf("unable to prepare context: %s", err)
 	}
 
 	if tempDir != "" {
@@ -185,7 +186,7 @@ func runBuild(dockerCli *command.DockerCli, options buildOptions) error {
 		// And canonicalize dockerfile name to a platform-independent one
 		relDockerfile, err = archive.CanonicalTarNameForPath(relDockerfile)
 		if err != nil {
-			return fmt.Errorf("cannot canonicalize dockerfile path %s: %v", relDockerfile, err)
+			return errors.Errorf("cannot canonicalize dockerfile path %s: %v", relDockerfile, err)
 		}
 
 		f, err := os.Open(filepath.Join(contextDir, ".dockerignore"))
@@ -203,7 +204,7 @@ func runBuild(dockerCli *command.DockerCli, options buildOptions) error {
 		}
 
 		if err := build.ValidateContextDirectory(contextDir, excludes); err != nil {
-			return fmt.Errorf("Error checking context: '%s'.", err)
+			return errors.Errorf("Error checking context: '%s'.", err)
 		}
 
 		// If .dockerignore mentions .dockerignore or the Dockerfile

command/image/build/context.go

@@ -18,6 +18,7 @@ import (
 	"github.com/docker/docker/pkg/ioutils"
 	"github.com/docker/docker/pkg/progress"
 	"github.com/docker/docker/pkg/streamformatter"
+	"github.com/pkg/errors"
 )
 
 const (
@@ -36,7 +37,7 @@ func ValidateContextDirectory(srcPath string, excludes []string) error {
 	return filepath.Walk(contextRoot, func(filePath string, f os.FileInfo, err error) error {
 		if err != nil {
 			if os.IsPermission(err) {
-				return fmt.Errorf("can't stat '%s'", filePath)
+				return errors.Errorf("can't stat '%s'", filePath)
 			}
 			if os.IsNotExist(err) {
 				return nil
@@ -65,7 +66,7 @@ func ValidateContextDirectory(srcPath string, excludes []string) error {
 		if !f.IsDir() {
 			currentFile, err := os.Open(filePath)
 			if err != nil && os.IsPermission(err) {
-				return fmt.Errorf("no permission to read from '%s'", filePath)
+				return errors.Errorf("no permission to read from '%s'", filePath)
 			}
 			currentFile.Close()
 		}
@@ -81,7 +82,7 @@ func GetContextFromReader(r io.ReadCloser, dockerfileName string) (out io.ReadCl
 
 	magic, err := buf.Peek(archive.HeaderSize)
 	if err != nil && err != io.EOF {
-		return nil, "", fmt.Errorf("failed to peek context header from STDIN: %v", err)
+		return nil, "", errors.Errorf("failed to peek context header from STDIN: %v", err)
 	}
 
 	if archive.IsArchive(magic) {
@@ -91,7 +92,7 @@ func GetContextFromReader(r io.ReadCloser, dockerfileName string) (out io.ReadCl
 	// Input should be read as a Dockerfile.
 	tmpDir, err := ioutil.TempDir("", "docker-build-context-")
 	if err != nil {
-		return nil, "", fmt.Errorf("unable to create temporary context directory: %v", err)
+		return nil, "", errors.Errorf("unable to create temporary context directory: %v", err)
 	}
 
 	f, err := os.Create(filepath.Join(tmpDir, DefaultDockerfileName))
@@ -131,10 +132,10 @@ func GetContextFromReader(r io.ReadCloser, dockerfileName string) (out io.ReadCl
 // success.
 func GetContextFromGitURL(gitURL, dockerfileName string) (absContextDir, relDockerfile string, err error) {
 	if _, err := exec.LookPath("git"); err != nil {
-		return "", "", fmt.Errorf("unable to find 'git': %v", err)
+		return "", "", errors.Errorf("unable to find 'git': %v", err)
 	}
 	if absContextDir, err = gitutils.Clone(gitURL); err != nil {
-		return "", "", fmt.Errorf("unable to 'git clone' to temporary context directory: %v", err)
+		return "", "", errors.Errorf("unable to 'git clone' to temporary context directory: %v", err)
 	}
 
 	return getDockerfileRelPath(absContextDir, dockerfileName)
@@ -147,7 +148,7 @@ func GetContextFromGitURL(gitURL, dockerfileName string) (absContextDir, relDock
 func GetContextFromURL(out io.Writer, remoteURL, dockerfileName string) (io.ReadCloser, string, error) {
 	response, err := httputils.Download(remoteURL)
 	if err != nil {
-		return nil, "", fmt.Errorf("unable to download remote context %s: %v", remoteURL, err)
+		return nil, "", errors.Errorf("unable to download remote context %s: %v", remoteURL, err)
 	}
 	progressOutput := streamformatter.NewStreamFormatter().NewProgressOutput(out, true)
 
@@ -167,7 +168,7 @@ func GetContextFromLocalDir(localDir, dockerfileName string) (absContextDir, rel
 	// current directory and not the context directory.
 	if dockerfileName != "" {
 		if dockerfileName, err = filepath.Abs(dockerfileName); err != nil {
-			return "", "", fmt.Errorf("unable to get absolute path to Dockerfile: %v", err)
+			return "", "", errors.Errorf("unable to get absolute path to Dockerfile: %v", err)
 		}
 	}
 
@@ -179,7 +180,7 @@ func GetContextFromLocalDir(localDir, dockerfileName string) (absContextDir, rel
 // the dockerfile in that context directory, and a non-nil error on success.
 func getDockerfileRelPath(givenContextDir, givenDockerfile string) (absContextDir, relDockerfile string, err error) {
 	if absContextDir, err = filepath.Abs(givenContextDir); err != nil {
-		return "", "", fmt.Errorf("unable to get absolute context directory of given context directory %q: %v", givenContextDir, err)
+		return "", "", errors.Errorf("unable to get absolute context directory of given context directory %q: %v", givenContextDir, err)
 	}
 
 	// The context dir might be a symbolic link, so follow it to the actual
@@ -192,17 +193,17 @@ func getDockerfileRelPath(givenContextDir, givenDockerfile string) (absContextDi
 	if !isUNC(absContextDir) {
 		absContextDir, err = filepath.EvalSymlinks(absContextDir)
 		if err != nil {
-			return "", "", fmt.Errorf("unable to evaluate symlinks in context path: %v", err)
+			return "", "", errors.Errorf("unable to evaluate symlinks in context path: %v", err)
 		}
 	}
 
 	stat, err := os.Lstat(absContextDir)
 	if err != nil {
-		return "", "", fmt.Errorf("unable to stat context directory %q: %v", absContextDir, err)
+		return "", "", errors.Errorf("unable to stat context directory %q: %v", absContextDir, err)
 	}
 
 	if !stat.IsDir() {
-		return "", "", fmt.Errorf("context must be a directory: %s", absContextDir)
+		return "", "", errors.Errorf("context must be a directory: %s", absContextDir)
 	}
 
 	absDockerfile := givenDockerfile
@@ -236,23 +237,23 @@ func getDockerfileRelPath(givenContextDir, givenDockerfile string) (absContextDi
 	if !isUNC(absDockerfile) {
 		absDockerfile, err = filepath.EvalSymlinks(absDockerfile)
 		if err != nil {
-			return "", "", fmt.Errorf("unable to evaluate symlinks in Dockerfile path: %v", err)
+			return "", "", errors.Errorf("unable to evaluate symlinks in Dockerfile path: %v", err)
 		}
 	}
 
 	if _, err := os.Lstat(absDockerfile); err != nil {
 		if os.IsNotExist(err) {
-			return "", "", fmt.Errorf("Cannot locate Dockerfile: %q", absDockerfile)
+			return "", "", errors.Errorf("Cannot locate Dockerfile: %q", absDockerfile)
 		}
-		return "", "", fmt.Errorf("unable to stat Dockerfile: %v", err)
+		return "", "", errors.Errorf("unable to stat Dockerfile: %v", err)
 	}
 
 	if relDockerfile, err = filepath.Rel(absContextDir, absDockerfile); err != nil {
-		return "", "", fmt.Errorf("unable to get relative Dockerfile path: %v", err)
+		return "", "", errors.Errorf("unable to get relative Dockerfile path: %v", err)
 	}
 
 	if strings.HasPrefix(relDockerfile, ".."+string(filepath.Separator)) {
-		return "", "", fmt.Errorf("The Dockerfile (%s) must be within the build context (%s)", givenDockerfile, givenContextDir)
+		return "", "", errors.Errorf("The Dockerfile (%s) must be within the build context (%s)", givenDockerfile, givenContextDir)
 	}
 
 	return absContextDir, relDockerfile, nil

command/image/load.go

@@ -1,7 +1,6 @@
 package image
 
 import (
-	"fmt"
 	"io"
 
 	"golang.org/x/net/context"
@@ -10,6 +9,7 @@ import (
 	"github.com/docker/docker/cli/command"
 	"github.com/docker/docker/pkg/jsonmessage"
 	"github.com/docker/docker/pkg/system"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 )
 
@@ -56,7 +56,7 @@ func runLoad(dockerCli *command.DockerCli, opts loadOptions) error {
 	// To avoid getting stuck, verify that a tar file is given either in
 	// the input flag or through stdin and if not display an error message and exit.
 	if opts.input == "" && dockerCli.In().IsTerminal() {
-		return fmt.Errorf("requested load from stdin, but stdin is empty")
+		return errors.Errorf("requested load from stdin, but stdin is empty")
 	}
 
 	if !dockerCli.Out().IsTerminal() {

command/image/pull.go

@@ -1,17 +1,16 @@
 package image
 
 import (
-	"errors"
 	"fmt"
 	"strings"
 
-	"golang.org/x/net/context"
-
 	"github.com/docker/distribution/reference"
 	"github.com/docker/docker/cli"
 	"github.com/docker/docker/cli/command"
 	"github.com/docker/docker/registry"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
+	"golang.org/x/net/context"
 )
 
 type pullOptions struct {

command/image/remove.go

@@ -9,6 +9,7 @@ import (
 	"github.com/docker/docker/api/types"
 	"github.com/docker/docker/cli"
 	"github.com/docker/docker/cli/command"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 )
 
@@ -71,7 +72,7 @@ func runRemove(dockerCli *command.DockerCli, opts removeOptions, images []string
 	}
 
 	if len(errs) > 0 {
-		return fmt.Errorf("%s", strings.Join(errs, "\n"))
+		return errors.Errorf("%s", strings.Join(errs, "\n"))
 	}
 	return nil
 }

command/image/save.go

@@ -1,14 +1,13 @@
 package image
 
 import (
-	"errors"
 	"io"
 
-	"golang.org/x/net/context"
-
 	"github.com/docker/docker/cli"
 	"github.com/docker/docker/cli/command"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
+	"golang.org/x/net/context"
 )
 
 type saveOptions struct {

command/image/trust.go

@@ -3,7 +3,6 @@ package image
 import (
 	"encoding/hex"
 	"encoding/json"
-	"errors"
 	"fmt"
 	"io"
 	"path"
@@ -19,6 +18,7 @@ import (
 	"github.com/docker/notary/client"
 	"github.com/docker/notary/tuf/data"
 	"github.com/opencontainers/go-digest"
+	"github.com/pkg/errors"
 	"golang.org/x/net/context"
 )
 
@@ -92,7 +92,7 @@ func PushTrustedReference(cli *command.DockerCli, repoInfo *registry.RepositoryI
 	}
 
 	if cnt > 1 {
-		return fmt.Errorf("internal error: only one call to handleTarget expected")
+		return errors.Errorf("internal error: only one call to handleTarget expected")
 	}
 
 	if target == nil {
@@ -195,7 +195,7 @@ func addTargetToAllSignableRoles(repo *client.NotaryRepository, target *client.T
 	}
 
 	if len(signableRoles) == 0 {
-		return fmt.Errorf("no valid signing keys for delegation roles")
+		return errors.Errorf("no valid signing keys for delegation roles")
 	}
 
 	return repo.AddTarget(target, signableRoles...)
@@ -245,7 +245,7 @@ func trustedPull(ctx context.Context, cli *command.DockerCli, repoInfo *registry
 			refs = append(refs, t)
 		}
 		if len(refs) == 0 {
-			return trust.NotaryError(ref.Name(), fmt.Errorf("No trusted tags for %s", ref.Name()))
+			return trust.NotaryError(ref.Name(), errors.Errorf("No trusted tags for %s", ref.Name()))
 		}
 	} else {
 		t, err := notaryRepo.GetTargetByName(tagged.Tag(), trust.ReleasesRole, data.CanonicalTargetsRole)
@@ -255,7 +255,7 @@ func trustedPull(ctx context.Context, cli *command.DockerCli, repoInfo *registry
 		// Only get the tag if it's in the top level targets role or the releases delegation role
 		// ignore it if it's in any other delegation roles
 		if t.Role != trust.ReleasesRole && t.Role != data.CanonicalTargetsRole {
-			return trust.NotaryError(ref.Name(), fmt.Errorf("No trust data for %s", tagged.Tag()))
+			return trust.NotaryError(ref.Name(), errors.Errorf("No trust data for %s", tagged.Tag()))
 		}
 
 		logrus.Debugf("retrieving target for %s role\n", t.Role)
@@ -347,7 +347,7 @@ func TrustedReference(ctx context.Context, cli *command.DockerCli, ref reference
 	// Only list tags in the top level targets role or the releases delegation role - ignore
 	// all other delegation roles
 	if t.Role != trust.ReleasesRole && t.Role != data.CanonicalTargetsRole {
-		return nil, trust.NotaryError(repoInfo.Name.Name(), fmt.Errorf("No trust data for %s", ref.Tag()))
+		return nil, trust.NotaryError(repoInfo.Name.Name(), errors.Errorf("No trust data for %s", ref.Tag()))
 	}
 	r, err := convertTarget(t.Target)
 	if err != nil {

command/in.go

@@ -1,12 +1,12 @@
 package command
 
 import (
-	"errors"
 	"io"
 	"os"
 	"runtime"
 
 	"github.com/docker/docker/pkg/term"
+	"github.com/pkg/errors"
 )
 
 // InStream is an input stream used by the DockerCli to read user input

command/inspect/inspector.go

@@ -3,7 +3,6 @@ package inspect
 import (
 	"bytes"
 	"encoding/json"
-	"fmt"
 	"io"
 	"strings"
 	"text/template"
@@ -11,6 +10,7 @@ import (
 	"github.com/Sirupsen/logrus"
 	"github.com/docker/docker/cli"
 	"github.com/docker/docker/pkg/templates"
+	"github.com/pkg/errors"
 )
 
 // Inspector defines an interface to implement to process elements
@@ -44,7 +44,7 @@ func NewTemplateInspectorFromString(out io.Writer, tmplStr string) (Inspector, e
 
 	tmpl, err := templates.Parse(tmplStr)
 	if err != nil {
-		return nil, fmt.Errorf("Template parsing error: %s", err)
+		return nil, errors.Errorf("Template parsing error: %s", err)
 	}
 	return NewTemplateInspector(out, tmpl), nil
 }
@@ -94,7 +94,7 @@ func (i *TemplateInspector) Inspect(typedElement interface{}, rawElement []byte)
 	buffer := new(bytes.Buffer)
 	if err := i.tmpl.Execute(buffer, typedElement); err != nil {
 		if rawElement == nil {
-			return fmt.Errorf("Template parsing error: %v", err)
+			return errors.Errorf("Template parsing error: %v", err)
 		}
 		return i.tryRawInspectFallback(rawElement)
 	}
@@ -112,12 +112,12 @@ func (i *TemplateInspector) tryRawInspectFallback(rawElement []byte) error {
 	dec := json.NewDecoder(rdr)
 
 	if rawErr := dec.Decode(&raw); rawErr != nil {
-		return fmt.Errorf("unable to read inspect data: %v", rawErr)
+		return errors.Errorf("unable to read inspect data: %v", rawErr)
 	}
 
 	tmplMissingKey := i.tmpl.Option("missingkey=error")
 	if rawErr := tmplMissingKey.Execute(buffer, raw); rawErr != nil {
-		return fmt.Errorf("Template parsing error: %v", rawErr)
+		return errors.Errorf("Template parsing error: %v", rawErr)
 	}
 
 	i.buffer.Write(buffer.Bytes())

command/network/create.go

@@ -13,6 +13,7 @@ import (
 	"github.com/docker/docker/cli/command"
 	"github.com/docker/docker/opts"
 	runconfigopts "github.com/docker/docker/runconfig/opts"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 )
 
@@ -114,7 +115,7 @@ func runCreate(dockerCli *command.DockerCli, opts createOptions) error {
 // structured ipam data.
 func consolidateIpam(subnets, ranges, gateways []string, auxaddrs map[string]string) ([]network.IPAMConfig, error) {
 	if len(subnets) < len(ranges) || len(subnets) < len(gateways) {
-		return nil, fmt.Errorf("every ip-range or gateway must have a corresponding subnet")
+		return nil, errors.Errorf("every ip-range or gateway must have a corresponding subnet")
 	}
 	iData := map[string]*network.IPAMConfig{}
 
@@ -130,7 +131,7 @@ func consolidateIpam(subnets, ranges, gateways []string, auxaddrs map[string]str
 				return nil, err
 			}
 			if ok1 || ok2 {
-				return nil, fmt.Errorf("multiple overlapping subnet configuration is not supported")
+				return nil, errors.Errorf("multiple overlapping subnet configuration is not supported")
 			}
 		}
 		iData[s] = &network.IPAMConfig{Subnet: s, AuxAddress: map[string]string{}}
@@ -148,14 +149,14 @@ func consolidateIpam(subnets, ranges, gateways []string, auxaddrs map[string]str
 				continue
 			}
 			if iData[s].IPRange != "" {
-				return nil, fmt.Errorf("cannot configure multiple ranges (%s, %s) on the same subnet (%s)", r, iData[s].IPRange, s)
+				return nil, errors.Errorf("cannot configure multiple ranges (%s, %s) on the same subnet (%s)", r, iData[s].IPRange, s)
 			}
 			d := iData[s]
 			d.IPRange = r
 			match = true
 		}
 		if !match {
-			return nil, fmt.Errorf("no matching subnet for range %s", r)
+			return nil, errors.Errorf("no matching subnet for range %s", r)
 		}
 	}
 
@@ -171,14 +172,14 @@ func consolidateIpam(subnets, ranges, gateways []string, auxaddrs map[string]str
 				continue
 			}
 			if iData[s].Gateway != "" {
-				return nil, fmt.Errorf("cannot configure multiple gateways (%s, %s) for the same subnet (%s)", g, iData[s].Gateway, s)
+				return nil, errors.Errorf("cannot configure multiple gateways (%s, %s) for the same subnet (%s)", g, iData[s].Gateway, s)
 			}
 			d := iData[s]
 			d.Gateway = g
 			match = true
 		}
 		if !match {
-			return nil, fmt.Errorf("no matching subnet for gateway %s", g)
+			return nil, errors.Errorf("no matching subnet for gateway %s", g)
 		}
 	}
 
@@ -197,7 +198,7 @@ func consolidateIpam(subnets, ranges, gateways []string, auxaddrs map[string]str
 			match = true
 		}
 		if !match {
-			return nil, fmt.Errorf("no matching subnet for aux-address %s", aa)
+			return nil, errors.Errorf("no matching subnet for aux-address %s", aa)
 		}
 	}
 
@@ -215,13 +216,13 @@ func subnetMatches(subnet, data string) (bool, error) {
 
 	_, s, err := net.ParseCIDR(subnet)
 	if err != nil {
-		return false, fmt.Errorf("Invalid subnet %s : %v", s, err)
+		return false, errors.Errorf("Invalid subnet %s : %v", s, err)
 	}
 
 	if strings.Contains(data, "/") {
 		ip, _, err = net.ParseCIDR(data)
 		if err != nil {
-			return false, fmt.Errorf("Invalid cidr %s : %v", data, err)
+			return false, errors.Errorf("Invalid cidr %s : %v", data, err)
 		}
 	} else {
 		ip = net.ParseIP(data)

command/node/demote_test.go

@@ -2,12 +2,12 @@ package node
 
 import (
 	"bytes"
-	"fmt"
 	"io/ioutil"
 	"testing"
 
 	"github.com/docker/docker/api/types/swarm"
 	"github.com/docker/docker/cli/internal/test"
+	"github.com/pkg/errors"
 	// Import builders to get the builder function as package function
 	. "github.com/docker/docker/cli/internal/test/builders"
 	"github.com/docker/docker/pkg/testutil/assert"
@@ -26,14 +26,14 @@ func TestNodeDemoteErrors(t *testing.T) {
 		{
 			args: []string{"nodeID"},
 			nodeInspectFunc: func() (swarm.Node, []byte, error) {
-				return swarm.Node{}, []byte{}, fmt.Errorf("error inspecting the node")
+				return swarm.Node{}, []byte{}, errors.Errorf("error inspecting the node")
 			},
 			expectedError: "error inspecting the node",
 		},
 		{
 			args: []string{"nodeID"},
 			nodeUpdateFunc: func(nodeID string, version swarm.Version, node swarm.NodeSpec) error {
-				return fmt.Errorf("error updating the node")
+				return errors.Errorf("error updating the node")
 			},
 			expectedError: "error updating the node",
 		},
@@ -60,7 +60,7 @@ func TestNodeDemoteNoChange(t *testing.T) {
 			},
 			nodeUpdateFunc: func(nodeID string, version swarm.Version, node swarm.NodeSpec) error {
 				if node.Role != swarm.NodeRoleWorker {
-					return fmt.Errorf("expected role worker, got %s", node.Role)
+					return errors.Errorf("expected role worker, got %s", node.Role)
 				}
 				return nil
 			},
@@ -78,7 +78,7 @@ func TestNodeDemoteMultipleNode(t *testing.T) {
 			},
 			nodeUpdateFunc: func(nodeID string, version swarm.Version, node swarm.NodeSpec) error {
 				if node.Role != swarm.NodeRoleWorker {
-					return fmt.Errorf("expected role worker, got %s", node.Role)
+					return errors.Errorf("expected role worker, got %s", node.Role)
 				}
 				return nil
 			},

command/node/inspect_test.go

@@ -9,6 +9,7 @@ import (
 	"github.com/docker/docker/api/types"
 	"github.com/docker/docker/api/types/swarm"
 	"github.com/docker/docker/cli/internal/test"
+	"github.com/pkg/errors"
 	// Import builders to get the builder function as package function
 	. "github.com/docker/docker/cli/internal/test/builders"
 	"github.com/docker/docker/pkg/testutil/assert"
@@ -29,24 +30,24 @@ func TestNodeInspectErrors(t *testing.T) {
 		{
 			args: []string{"self"},
 			infoFunc: func() (types.Info, error) {
-				return types.Info{}, fmt.Errorf("error asking for node info")
+				return types.Info{}, errors.Errorf("error asking for node info")
 			},
 			expectedError: "error asking for node info",
 		},
 		{
 			args: []string{"nodeID"},
 			nodeInspectFunc: func() (swarm.Node, []byte, error) {
-				return swarm.Node{}, []byte{}, fmt.Errorf("error inspecting the node")
+				return swarm.Node{}, []byte{}, errors.Errorf("error inspecting the node")
 			},
 			infoFunc: func() (types.Info, error) {
-				return types.Info{}, fmt.Errorf("error asking for node info")
+				return types.Info{}, errors.Errorf("error asking for node info")
 			},
 			expectedError: "error inspecting the node",
 		},
 		{
 			args: []string{"self"},
 			nodeInspectFunc: func() (swarm.Node, []byte, error) {
-				return swarm.Node{}, []byte{}, fmt.Errorf("error inspecting the node")
+				return swarm.Node{}, []byte{}, errors.Errorf("error inspecting the node")
 			},
 			infoFunc: func() (types.Info, error) {
 				return types.Info{}, nil
@@ -59,7 +60,7 @@ func TestNodeInspectErrors(t *testing.T) {
 				"pretty": "true",
 			},
 			infoFunc: func() (types.Info, error) {
-				return types.Info{}, fmt.Errorf("error asking for node info")
+				return types.Info{}, errors.Errorf("error asking for node info")
 			},
 			expectedError: "error asking for node info",
 		},

command/node/list_test.go

@@ -2,13 +2,13 @@ package node
 
 import (
 	"bytes"
-	"fmt"
 	"io/ioutil"
 	"testing"
 
 	"github.com/docker/docker/api/types"
 	"github.com/docker/docker/api/types/swarm"
 	"github.com/docker/docker/cli/internal/test"
+	"github.com/pkg/errors"
 	// Import builders to get the builder function as package function
 	. "github.com/docker/docker/cli/internal/test/builders"
 	"github.com/docker/docker/pkg/testutil/assert"
@@ -22,7 +22,7 @@ func TestNodeListErrorOnAPIFailure(t *testing.T) {
 	}{
 		{
 			nodeListFunc: func() ([]swarm.Node, error) {
-				return []swarm.Node{}, fmt.Errorf("error listing nodes")
+				return []swarm.Node{}, errors.Errorf("error listing nodes")
 			},
 			expectedError: "error listing nodes",
 		},
@@ -35,7 +35,7 @@ func TestNodeListErrorOnAPIFailure(t *testing.T) {
 				}, nil
 			},
 			infoFunc: func() (types.Info, error) {
-				return types.Info{}, fmt.Errorf("error asking for node info")
+				return types.Info{}, errors.Errorf("error asking for node info")
 			},
 			expectedError: "error asking for node info",
 		},

command/node/promote_test.go

@@ -2,12 +2,12 @@ package node
 
 import (
 	"bytes"
-	"fmt"
 	"io/ioutil"
 	"testing"
 
 	"github.com/docker/docker/api/types/swarm"
 	"github.com/docker/docker/cli/internal/test"
+	"github.com/pkg/errors"
 	// Import builders to get the builder function as package function
 	. "github.com/docker/docker/cli/internal/test/builders"
 	"github.com/docker/docker/pkg/testutil/assert"
@@ -26,14 +26,14 @@ func TestNodePromoteErrors(t *testing.T) {
 		{
 			args: []string{"nodeID"},
 			nodeInspectFunc: func() (swarm.Node, []byte, error) {
-				return swarm.Node{}, []byte{}, fmt.Errorf("error inspecting the node")
+				return swarm.Node{}, []byte{}, errors.Errorf("error inspecting the node")
 			},
 			expectedError: "error inspecting the node",
 		},
 		{
 			args: []string{"nodeID"},
 			nodeUpdateFunc: func(nodeID string, version swarm.Version, node swarm.NodeSpec) error {
-				return fmt.Errorf("error updating the node")
+				return errors.Errorf("error updating the node")
 			},
 			expectedError: "error updating the node",
 		},
@@ -60,7 +60,7 @@ func TestNodePromoteNoChange(t *testing.T) {
 			},
 			nodeUpdateFunc: func(nodeID string, version swarm.Version, node swarm.NodeSpec) error {
 				if node.Role != swarm.NodeRoleManager {
-					return fmt.Errorf("expected role manager, got %s", node.Role)
+					return errors.Errorf("expected role manager, got %s", node.Role)
 				}
 				return nil
 			},
@@ -78,7 +78,7 @@ func TestNodePromoteMultipleNode(t *testing.T) {
 			},
 			nodeUpdateFunc: func(nodeID string, version swarm.Version, node swarm.NodeSpec) error {
 				if node.Role != swarm.NodeRoleManager {
-					return fmt.Errorf("expected role manager, got %s", node.Role)
+					return errors.Errorf("expected role manager, got %s", node.Role)
 				}
 				return nil
 			},

command/node/ps.go

@@ -1,7 +1,6 @@
 package node
 
 import (
-	"fmt"
 	"strings"
 
 	"github.com/docker/docker/api/types"
@@ -12,6 +11,7 @@ import (
 	"github.com/docker/docker/cli/command/idresolver"
 	"github.com/docker/docker/cli/command/task"
 	"github.com/docker/docker/opts"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"golang.org/x/net/context"
 )
@@ -100,7 +100,7 @@ func runPs(dockerCli command.Cli, opts psOptions) error {
 	}
 
 	if len(errs) > 0 {
-		return fmt.Errorf("%s", strings.Join(errs, "\n"))
+		return errors.Errorf("%s", strings.Join(errs, "\n"))
 	}
 
 	return nil

command/node/ps_test.go

@@ -10,6 +10,7 @@ import (
 	"github.com/docker/docker/api/types"
 	"github.com/docker/docker/api/types/swarm"
 	"github.com/docker/docker/cli/internal/test"
+	"github.com/pkg/errors"
 	// Import builders to get the builder function as package function
 	. "github.com/docker/docker/cli/internal/test/builders"
 	"github.com/docker/docker/pkg/testutil/assert"
@@ -28,21 +29,21 @@ func TestNodePsErrors(t *testing.T) {
 	}{
 		{
 			infoFunc: func() (types.Info, error) {
-				return types.Info{}, fmt.Errorf("error asking for node info")
+				return types.Info{}, errors.Errorf("error asking for node info")
 			},
 			expectedError: "error asking for node info",
 		},
 		{
 			args: []string{"nodeID"},
 			nodeInspectFunc: func() (swarm.Node, []byte, error) {
-				return swarm.Node{}, []byte{}, fmt.Errorf("error inspecting the node")
+				return swarm.Node{}, []byte{}, errors.Errorf("error inspecting the node")
 			},
 			expectedError: "error inspecting the node",
 		},
 		{
 			args: []string{"nodeID"},
 			taskListFunc: func(options types.TaskListOptions) ([]swarm.Task, error) {
-				return []swarm.Task{}, fmt.Errorf("error returning the task list")
+				return []swarm.Task{}, errors.Errorf("error returning the task list")
 			},
 			expectedError: "error returning the task list",
 		},

command/node/remove.go

@@ -9,6 +9,7 @@ import (
 	"github.com/docker/docker/api/types"
 	"github.com/docker/docker/cli"
 	"github.com/docker/docker/cli/command"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 )
 
@@ -49,7 +50,7 @@ func runRemove(dockerCli command.Cli, args []string, opts removeOptions) error {
 	}
 
 	if len(errs) > 0 {
-		return fmt.Errorf("%s", strings.Join(errs, "\n"))
+		return errors.Errorf("%s", strings.Join(errs, "\n"))
 	}
 
 	return nil

command/node/remove_test.go

@@ -2,12 +2,12 @@ package node
 
 import (
 	"bytes"
-	"fmt"
 	"io/ioutil"
 	"testing"
 
 	"github.com/docker/docker/cli/internal/test"
 	"github.com/docker/docker/pkg/testutil/assert"
+	"github.com/pkg/errors"
 )
 
 func TestNodeRemoveErrors(t *testing.T) {
@@ -22,7 +22,7 @@ func TestNodeRemoveErrors(t *testing.T) {
 		{
 			args: []string{"nodeID"},
 			nodeRemoveFunc: func() error {
-				return fmt.Errorf("error removing the node")
+				return errors.Errorf("error removing the node")
 			},
 			expectedError: "error removing the node",
 		},

command/node/update.go

@@ -1,7 +1,6 @@
 package node
 
 import (
-	"errors"
 	"fmt"
 
 	"github.com/docker/docker/api/types/swarm"
@@ -9,6 +8,7 @@ import (
 	"github.com/docker/docker/cli/command"
 	"github.com/docker/docker/opts"
 	runconfigopts "github.com/docker/docker/runconfig/opts"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"github.com/spf13/pflag"
 	"golang.org/x/net/context"
@@ -104,7 +104,7 @@ func mergeNodeUpdate(flags *pflag.FlagSet) func(*swarm.Node) error {
 			for _, k := range keys {
 				// if a key doesn't exist, fail the command explicitly
 				if _, exists := spec.Annotations.Labels[k]; !exists {
-					return fmt.Errorf("key %s doesn't exist in node's labels", k)
+					return errors.Errorf("key %s doesn't exist in node's labels", k)
 				}
 				delete(spec.Annotations.Labels, k)
 			}

command/node/update_test.go

@@ -2,12 +2,12 @@ package node
 
 import (
 	"bytes"
-	"fmt"
 	"io/ioutil"
 	"testing"
 
 	"github.com/docker/docker/api/types/swarm"
 	"github.com/docker/docker/cli/internal/test"
+	"github.com/pkg/errors"
 	// Import builders to get the builder function as package function
 	. "github.com/docker/docker/cli/internal/test/builders"
 	"github.com/docker/docker/pkg/testutil/assert"
@@ -31,14 +31,14 @@ func TestNodeUpdateErrors(t *testing.T) {
 		{
 			args: []string{"nodeID"},
 			nodeInspectFunc: func() (swarm.Node, []byte, error) {
-				return swarm.Node{}, []byte{}, fmt.Errorf("error inspecting the node")
+				return swarm.Node{}, []byte{}, errors.Errorf("error inspecting the node")
 			},
 			expectedError: "error inspecting the node",
 		},
 		{
 			args: []string{"nodeID"},
 			nodeUpdateFunc: func(nodeID string, version swarm.Version, node swarm.NodeSpec) error {
-				return fmt.Errorf("error updating the node")
+				return errors.Errorf("error updating the node")
 			},
 			expectedError: "error updating the node",
 		},
@@ -88,7 +88,7 @@ func TestNodeUpdate(t *testing.T) {
 			},
 			nodeUpdateFunc: func(nodeID string, version swarm.Version, node swarm.NodeSpec) error {
 				if node.Role != swarm.NodeRoleManager {
-					return fmt.Errorf("expected role manager, got %s", node.Role)
+					return errors.Errorf("expected role manager, got %s", node.Role)
 				}
 				return nil
 			},
@@ -103,7 +103,7 @@ func TestNodeUpdate(t *testing.T) {
 			},
 			nodeUpdateFunc: func(nodeID string, version swarm.Version, node swarm.NodeSpec) error {
 				if node.Availability != swarm.NodeAvailabilityDrain {
-					return fmt.Errorf("expected drain availability, got %s", node.Availability)
+					return errors.Errorf("expected drain availability, got %s", node.Availability)
 				}
 				return nil
 			},
@@ -118,7 +118,7 @@ func TestNodeUpdate(t *testing.T) {
 			},
 			nodeUpdateFunc: func(nodeID string, version swarm.Version, node swarm.NodeSpec) error {
 				if _, present := node.Annotations.Labels["lbl"]; !present {
-					return fmt.Errorf("expected 'lbl' label, got %v", node.Annotations.Labels)
+					return errors.Errorf("expected 'lbl' label, got %v", node.Annotations.Labels)
 				}
 				return nil
 			},
@@ -133,7 +133,7 @@ func TestNodeUpdate(t *testing.T) {
 			},
 			nodeUpdateFunc: func(nodeID string, version swarm.Version, node swarm.NodeSpec) error {
 				if value, present := node.Annotations.Labels["key"]; !present || value != "value" {
-					return fmt.Errorf("expected 'key' label to be 'value', got %v", node.Annotations.Labels)
+					return errors.Errorf("expected 'key' label to be 'value', got %v", node.Annotations.Labels)
 				}
 				return nil
 			},
@@ -150,7 +150,7 @@ func TestNodeUpdate(t *testing.T) {
 			},
 			nodeUpdateFunc: func(nodeID string, version swarm.Version, node swarm.NodeSpec) error {
 				if len(node.Annotations.Labels) > 0 {
-					return fmt.Errorf("expected no labels, got %v", node.Annotations.Labels)
+					return errors.Errorf("expected no labels, got %v", node.Annotations.Labels)
 				}
 				return nil
 			},

command/plugin/create.go

@@ -13,6 +13,7 @@ import (
 	"github.com/docker/docker/cli"
 	"github.com/docker/docker/cli/command"
 	"github.com/docker/docker/pkg/archive"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"golang.org/x/net/context"
 )
@@ -50,7 +51,7 @@ func validateContextDir(contextDir string) (string, error) {
 	}
 
 	if !stat.IsDir() {
-		return "", fmt.Errorf("context must be a directory")
+		return "", errors.Errorf("context must be a directory")
 	}
 
 	return absContextDir, nil

command/plugin/enable.go

@@ -6,6 +6,7 @@ import (
 	"github.com/docker/docker/api/types"
 	"github.com/docker/docker/cli"
 	"github.com/docker/docker/cli/command"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"golang.org/x/net/context"
 )
@@ -36,7 +37,7 @@ func newEnableCommand(dockerCli *command.DockerCli) *cobra.Command {
 func runEnable(dockerCli *command.DockerCli, opts *enableOpts) error {
 	name := opts.name
 	if opts.timeout < 0 {
-		return fmt.Errorf("negative timeout %d is invalid", opts.timeout)
+		return errors.Errorf("negative timeout %d is invalid", opts.timeout)
 	}
 
 	if err := dockerCli.Client().PluginEnable(context.Background(), name, types.PluginEnableOptions{Timeout: opts.timeout}); err != nil {

command/plugin/install.go

@@ -1,7 +1,6 @@
 package plugin
 
 import (
-	"errors"
 	"fmt"
 	"strings"
 
@@ -12,6 +11,7 @@ import (
 	"github.com/docker/docker/cli/command/image"
 	"github.com/docker/docker/pkg/jsonmessage"
 	"github.com/docker/docker/registry"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"github.com/spf13/pflag"
 	"golang.org/x/net/context"
@@ -92,7 +92,7 @@ func buildPullConfig(ctx context.Context, dockerCli *command.DockerCli, opts plu
 		ref = reference.TagNameOnly(ref)
 		nt, ok := ref.(reference.NamedTagged)
 		if !ok {
-			return types.PluginInstallOptions{}, fmt.Errorf("invalid name: %s", ref.String())
+			return types.PluginInstallOptions{}, errors.Errorf("invalid name: %s", ref.String())
 		}
 
 		ctx := context.Background()
@@ -132,7 +132,7 @@ func runInstall(dockerCli *command.DockerCli, opts pluginOptions) error {
 			return err
 		}
 		if _, ok := aref.(reference.Canonical); ok {
-			return fmt.Errorf("invalid name: %s", opts.localName)
+			return errors.Errorf("invalid name: %s", opts.localName)
 		}
 		localName = reference.FamiliarString(reference.TagNameOnly(aref))
 	}

command/plugin/push.go

@@ -1,8 +1,6 @@
 package plugin
 
 import (
-	"fmt"
-
 	"golang.org/x/net/context"
 
 	"github.com/docker/distribution/reference"
@@ -11,6 +9,7 @@ import (
 	"github.com/docker/docker/cli/command/image"
 	"github.com/docker/docker/pkg/jsonmessage"
 	"github.com/docker/docker/registry"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 )
 
@@ -37,7 +36,7 @@ func runPush(dockerCli *command.DockerCli, name string) error {
 		return err
 	}
 	if _, ok := named.(reference.Canonical); ok {
-		return fmt.Errorf("invalid name: %s", name)
+		return errors.Errorf("invalid name: %s", name)
 	}
 
 	named = reference.TagNameOnly(named)

command/plugin/upgrade.go

@@ -39,11 +39,11 @@ func runUpgrade(dockerCli *command.DockerCli, opts pluginOptions) error {
 	ctx := context.Background()
 	p, _, err := dockerCli.Client().PluginInspectWithRaw(ctx, opts.localName)
 	if err != nil {
-		return fmt.Errorf("error reading plugin data: %v", err)
+		return errors.Errorf("error reading plugin data: %v", err)
 	}
 
 	if p.Enabled {
-		return fmt.Errorf("the plugin must be disabled before upgrading")
+		return errors.Errorf("the plugin must be disabled before upgrading")
 	}
 
 	opts.localName = p.Name

command/registry.go

@@ -17,6 +17,7 @@ import (
 	registrytypes "github.com/docker/docker/api/types/registry"
 	"github.com/docker/docker/pkg/term"
 	"github.com/docker/docker/registry"
+	"github.com/pkg/errors"
 )
 
 // ElectAuthServer returns the default registry to use (by asking the daemon)
@@ -95,7 +96,7 @@ func ConfigureAuth(cli *DockerCli, flUser, flPassword, serverAddress string, isD
 	// will hit this if you attempt docker login from mintty where stdin
 	// is a pipe, not a character based console.
 	if flPassword == "" && !cli.In().IsTerminal() {
-		return authconfig, fmt.Errorf("Error: Cannot perform an interactive login from a non TTY device")
+		return authconfig, errors.Errorf("Error: Cannot perform an interactive login from a non TTY device")
 	}
 
 	authconfig.Username = strings.TrimSpace(authconfig.Username)
@@ -113,7 +114,7 @@ func ConfigureAuth(cli *DockerCli, flUser, flPassword, serverAddress string, isD
 		}
 	}
 	if flUser == "" {
-		return authconfig, fmt.Errorf("Error: Non-null Username Required")
+		return authconfig, errors.Errorf("Error: Non-null Username Required")
 	}
 	if flPassword == "" {
 		oldState, err := term.SaveState(cli.In().FD())
@@ -128,7 +129,7 @@ func ConfigureAuth(cli *DockerCli, flUser, flPassword, serverAddress string, isD
 
 		term.RestoreTerminal(cli.In().FD(), oldState)
 		if flPassword == "" {
-			return authconfig, fmt.Errorf("Error: Password Required")
+			return authconfig, errors.Errorf("Error: Password Required")
 		}
 	}
 

command/registry/login.go

@@ -8,6 +8,7 @@ import (
 	"github.com/docker/docker/cli"
 	"github.com/docker/docker/cli/command"
 	"github.com/docker/docker/registry"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 )
 
@@ -76,7 +77,7 @@ func runLogin(dockerCli *command.DockerCli, opts loginOptions) error {
 		authConfig.IdentityToken = response.IdentityToken
 	}
 	if err := dockerCli.CredentialsStore(serverAddress).Store(authConfig); err != nil {
-		return fmt.Errorf("Error saving credentials: %v", err)
+		return errors.Errorf("Error saving credentials: %v", err)
 	}
 
 	if response.Status != "" {

command/secret/create.go

@@ -11,6 +11,7 @@ import (
 	"github.com/docker/docker/opts"
 	"github.com/docker/docker/pkg/system"
 	runconfigopts "github.com/docker/docker/runconfig/opts"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"golang.org/x/net/context"
 )
@@ -58,7 +59,7 @@ func runSecretCreate(dockerCli *command.DockerCli, options createOptions) error
 
 	secretData, err := ioutil.ReadAll(in)
 	if err != nil {
-		return fmt.Errorf("Error reading content from %q: %v", options.file, err)
+		return errors.Errorf("Error reading content from %q: %v", options.file, err)
 	}
 
 	spec := swarm.SecretSpec{

command/secret/remove.go

@@ -6,6 +6,7 @@ import (
 
 	"github.com/docker/docker/cli"
 	"github.com/docker/docker/cli/command"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"golang.org/x/net/context"
 )
@@ -45,7 +46,7 @@ func runSecretRemove(dockerCli *command.DockerCli, opts removeOptions) error {
 	}
 
 	if len(errs) > 0 {
-		return fmt.Errorf("%s", strings.Join(errs, "\n"))
+		return errors.Errorf("%s", strings.Join(errs, "\n"))
 	}
 
 	return nil

command/service/inspect.go

@@ -1,7 +1,6 @@
 package service
 
 import (
-	"fmt"
 	"strings"
 
 	"golang.org/x/net/context"
@@ -10,6 +9,7 @@ import (
 	"github.com/docker/docker/cli/command"
 	"github.com/docker/docker/cli/command/formatter"
 	apiclient "github.com/docker/docker/client"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 )
 
@@ -30,7 +30,7 @@ func newInspectCommand(dockerCli *command.DockerCli) *cobra.Command {
 			opts.refs = args
 
 			if opts.pretty && len(opts.format) > 0 {
-				return fmt.Errorf("--format is incompatible with human friendly format")
+				return errors.Errorf("--format is incompatible with human friendly format")
 			}
 			return runInspect(dockerCli, opts)
 		},
@@ -55,7 +55,7 @@ func runInspect(dockerCli *command.DockerCli, opts inspectOptions) error {
 		if err == nil || !apiclient.IsErrServiceNotFound(err) {
 			return service, nil, err
 		}
-		return nil, nil, fmt.Errorf("Error: no such service: %s", ref)
+		return nil, nil, errors.Errorf("Error: no such service: %s", ref)
 	}
 
 	f := opts.format
@@ -69,7 +69,7 @@ func runInspect(dockerCli *command.DockerCli, opts inspectOptions) error {
 	// check if the user is trying to apply a template to the pretty format, which
 	// is not supported
 	if strings.HasPrefix(f, "pretty") && f != "pretty" {
-		return fmt.Errorf("Cannot supply extra formatting options to the pretty template")
+		return errors.Errorf("Cannot supply extra formatting options to the pretty template")
 	}
 
 	serviceCtx := formatter.Context{

command/service/logs.go

@@ -17,6 +17,7 @@ import (
 	"github.com/docker/docker/client"
 	"github.com/docker/docker/pkg/stdcopy"
 	"github.com/docker/docker/pkg/stringid"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 )
 
@@ -170,7 +171,7 @@ func (lw *logWriter) Write(buf []byte) (int, error) {
 
 	parts := bytes.SplitN(buf, []byte(" "), numParts)
 	if len(parts) != numParts {
-		return 0, fmt.Errorf("invalid context in log message: %v", string(buf))
+		return 0, errors.Errorf("invalid context in log message: %v", string(buf))
 	}
 
 	logCtx, err := lw.parseContext(string(parts[contextIndex]))
@@ -210,24 +211,24 @@ func (lw *logWriter) parseContext(input string) (logContext, error) {
 	for _, component := range components {
 		parts := strings.SplitN(component, "=", 2)
 		if len(parts) != 2 {
-			return logContext{}, fmt.Errorf("invalid context: %s", input)
+			return logContext{}, errors.Errorf("invalid context: %s", input)
 		}
 		context[parts[0]] = parts[1]
 	}
 
 	nodeID, ok := context["com.docker.swarm.node.id"]
 	if !ok {
-		return logContext{}, fmt.Errorf("missing node id in context: %s", input)
+		return logContext{}, errors.Errorf("missing node id in context: %s", input)
 	}
 
 	serviceID, ok := context["com.docker.swarm.service.id"]
 	if !ok {
-		return logContext{}, fmt.Errorf("missing service id in context: %s", input)
+		return logContext{}, errors.Errorf("missing service id in context: %s", input)
 	}
 
 	taskID, ok := context["com.docker.swarm.task.id"]
 	if !ok {
-		return logContext{}, fmt.Errorf("missing task id in context: %s", input)
+		return logContext{}, errors.Errorf("missing task id in context: %s", input)
 	}
 
 	return logContext{

command/service/opts.go

@@ -1,7 +1,6 @@
 package service
 
 import (
-	"errors"
 	"fmt"
 	"strconv"
 	"strings"
@@ -11,6 +10,7 @@ import (
 	"github.com/docker/docker/api/types/swarm"
 	"github.com/docker/docker/opts"
 	runconfigopts "github.com/docker/docker/runconfig/opts"
+	"github.com/pkg/errors"
 	"github.com/spf13/pflag"
 )
 
@@ -32,7 +32,7 @@ func (d *PositiveDurationOpt) Set(s string) error {
 		return err
 	}
 	if *d.DurationOpt.value < 0 {
-		return fmt.Errorf("duration cannot be negative")
+		return errors.Errorf("duration cannot be negative")
 	}
 	return nil
 }
@@ -140,7 +140,7 @@ func (opts *placementPrefOpts) Set(value string) error {
 		return errors.New(`placement preference must be of the format "<strategy>=<arg>"`)
 	}
 	if fields[0] != "spread" {
-		return fmt.Errorf("unsupported placement preference %s (only spread is supported)", fields[0])
+		return errors.Errorf("unsupported placement preference %s (only spread is supported)", fields[0])
 	}
 
 	opts.prefs = append(opts.prefs, swarm.PlacementPreference{
@@ -268,7 +268,7 @@ func (opts *healthCheckOptions) toHealthConfig() (*container.HealthConfig, error
 		opts.retries != 0
 	if opts.noHealthcheck {
 		if haveHealthSettings {
-			return nil, fmt.Errorf("--%s conflicts with --health-* options", flagNoHealthcheck)
+			return nil, errors.Errorf("--%s conflicts with --health-* options", flagNoHealthcheck)
 		}
 		healthConfig = &container.HealthConfig{Test: []string{"NONE"}}
 	} else if haveHealthSettings {
@@ -372,7 +372,7 @@ func (opts *serviceOptions) ToServiceMode() (swarm.ServiceMode, error) {
 	switch opts.mode {
 	case "global":
 		if opts.replicas.Value() != nil {
-			return serviceMode, fmt.Errorf("replicas can only be used with replicated mode")
+			return serviceMode, errors.Errorf("replicas can only be used with replicated mode")
 		}
 
 		serviceMode.Global = &swarm.GlobalService{}
@@ -381,7 +381,7 @@ func (opts *serviceOptions) ToServiceMode() (swarm.ServiceMode, error) {
 			Replicas: opts.replicas.Value(),
 		}
 	default:
-		return serviceMode, fmt.Errorf("Unknown mode: %s, only replicated and global supported", opts.mode)
+		return serviceMode, errors.Errorf("Unknown mode: %s, only replicated and global supported", opts.mode)
 	}
 	return serviceMode, nil
 }

command/service/parse.go

@@ -1,12 +1,11 @@
 package service
 
 import (
-	"fmt"
-
 	"github.com/docker/docker/api/types"
 	"github.com/docker/docker/api/types/filters"
 	swarmtypes "github.com/docker/docker/api/types/swarm"
 	"github.com/docker/docker/client"
+	"github.com/pkg/errors"
 	"golang.org/x/net/context"
 )
 
@@ -18,7 +17,7 @@ func ParseSecrets(client client.SecretAPIClient, requestedSecrets []*swarmtypes.
 
 	for _, secret := range requestedSecrets {
 		if _, exists := secretRefs[secret.File.Name]; exists {
-			return nil, fmt.Errorf("duplicate secret target for %s not allowed", secret.SecretName)
+			return nil, errors.Errorf("duplicate secret target for %s not allowed", secret.SecretName)
 		}
 		secretRef := new(swarmtypes.SecretReference)
 		*secretRef = *secret
@@ -47,7 +46,7 @@ func ParseSecrets(client client.SecretAPIClient, requestedSecrets []*swarmtypes.
 	for _, ref := range secretRefs {
 		id, ok := foundSecrets[ref.SecretName]
 		if !ok {
-			return nil, fmt.Errorf("secret not found: %s", ref.SecretName)
+			return nil, errors.Errorf("secret not found: %s", ref.SecretName)
 		}
 
 		// set the id for the ref to properly assign in swarm

command/service/ps.go

@@ -1,7 +1,6 @@
 package service
 
 import (
-	"fmt"
 	"strings"
 
 	"golang.org/x/net/context"
@@ -15,6 +14,7 @@ import (
 	"github.com/docker/docker/cli/command/node"
 	"github.com/docker/docker/cli/command/task"
 	"github.com/docker/docker/opts"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 )
 
@@ -89,7 +89,7 @@ func runPS(dockerCli *command.DockerCli, opts psOptions) error {
 		}
 		// If nothing has been found, return immediately.
 		if serviceCount == 0 {
-			return fmt.Errorf("no such services: %s", service)
+			return errors.Errorf("no such services: %s", service)
 		}
 	}
 

command/service/remove.go

@@ -6,6 +6,7 @@ import (
 
 	"github.com/docker/docker/cli"
 	"github.com/docker/docker/cli/command"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"golang.org/x/net/context"
 )
@@ -41,7 +42,7 @@ func runRemove(dockerCli *command.DockerCli, sids []string) error {
 		fmt.Fprintf(dockerCli.Out(), "%s\n", sid)
 	}
 	if len(errs) > 0 {
-		return fmt.Errorf(strings.Join(errs, "\n"))
+		return errors.Errorf(strings.Join(errs, "\n"))
 	}
 	return nil
 }

command/service/scale.go

@@ -10,6 +10,7 @@ import (
 	"github.com/docker/docker/api/types"
 	"github.com/docker/docker/cli"
 	"github.com/docker/docker/cli/command"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 )
 
@@ -30,7 +31,7 @@ func scaleArgs(cmd *cobra.Command, args []string) error {
 	}
 	for _, arg := range args {
 		if parts := strings.SplitN(arg, "=", 2); len(parts) != 2 {
-			return fmt.Errorf(
+			return errors.Errorf(
 				"Invalid scale specifier '%s'.\nSee '%s --help'.\n\nUsage:  %s\n\n%s",
 				arg,
 				cmd.CommandPath(),
@@ -43,7 +44,7 @@ func scaleArgs(cmd *cobra.Command, args []string) error {
 }
 
 func runScale(dockerCli *command.DockerCli, args []string) error {
-	var errors []string
+	var errs []string
 	for _, arg := range args {
 		parts := strings.SplitN(arg, "=", 2)
 		serviceID, scaleStr := parts[0], parts[1]
@@ -51,19 +52,19 @@ func runScale(dockerCli *command.DockerCli, args []string) error {
 		// validate input arg scale number
 		scale, err := strconv.ParseUint(scaleStr, 10, 64)
 		if err != nil {
-			errors = append(errors, fmt.Sprintf("%s: invalid replicas value %s: %v", serviceID, scaleStr, err))
+			errs = append(errs, fmt.Sprintf("%s: invalid replicas value %s: %v", serviceID, scaleStr, err))
 			continue
 		}
 
 		if err := runServiceScale(dockerCli, serviceID, scale); err != nil {
-			errors = append(errors, fmt.Sprintf("%s: %v", serviceID, err))
+			errs = append(errs, fmt.Sprintf("%s: %v", serviceID, err))
 		}
 	}
 
-	if len(errors) == 0 {
+	if len(errs) == 0 {
 		return nil
 	}
-	return fmt.Errorf(strings.Join(errors, "\n"))
+	return errors.Errorf(strings.Join(errs, "\n"))
 }
 
 func runServiceScale(dockerCli *command.DockerCli, serviceID string, scale uint64) error {
@@ -77,7 +78,7 @@ func runServiceScale(dockerCli *command.DockerCli, serviceID string, scale uint6
 
 	serviceMode := &service.Spec.Mode
 	if serviceMode.Replicated == nil {
-		return fmt.Errorf("scale can only be used with replicated mode")
+		return errors.Errorf("scale can only be used with replicated mode")
 	}
 
 	serviceMode.Replicated.Replicas = &scale

command/service/trust.go

@@ -2,7 +2,6 @@ package service
 
 import (
 	"encoding/hex"
-	"fmt"
 
 	"github.com/Sirupsen/logrus"
 	"github.com/docker/distribution/reference"
@@ -72,7 +71,7 @@ func trustedResolveDigest(ctx context.Context, cli *command.DockerCli, ref refer
 	// Only get the tag if it's in the top level targets role or the releases delegation role
 	// ignore it if it's in any other delegation roles
 	if t.Role != trust.ReleasesRole && t.Role != data.CanonicalTargetsRole {
-		return nil, trust.NotaryError(repoInfo.Name.Name(), fmt.Errorf("No trust data for %s", reference.FamiliarString(ref)))
+		return nil, trust.NotaryError(repoInfo.Name.Name(), errors.Errorf("No trust data for %s", reference.FamiliarString(ref)))
 	}
 
 	logrus.Debugf("retrieving target for %s role\n", t.Role)

command/service/update.go

@@ -1,7 +1,6 @@
 package service
 
 import (
-	"errors"
 	"fmt"
 	"sort"
 	"strings"
@@ -19,6 +18,7 @@ import (
 	runconfigopts "github.com/docker/docker/runconfig/opts"
 	"github.com/docker/go-connections/nat"
 	shlex "github.com/flynn-archive/go-shlex"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"github.com/spf13/pflag"
 	"golang.org/x/net/context"
@@ -136,7 +136,7 @@ func runUpdate(dockerCli *command.DockerCli, flags *pflag.FlagSet, serviceID str
 			clientSideRollback = true
 			spec = service.PreviousSpec
 			if spec == nil {
-				return fmt.Errorf("service does not have a previous specification to roll back to")
+				return errors.Errorf("service does not have a previous specification to roll back to")
 			}
 		} else {
 			serverSideRollback = true
@@ -621,7 +621,7 @@ func updateMounts(flags *pflag.FlagSet, mounts *[]mounttypes.Mount) error {
 		values := flags.Lookup(flagMountAdd).Value.(*opts.MountOpt).Value()
 		for _, mount := range values {
 			if _, ok := mountsByTarget[mount.Target]; ok {
-				return fmt.Errorf("duplicate mount target")
+				return errors.Errorf("duplicate mount target")
 			}
 			mountsByTarget[mount.Target] = mount
 		}
@@ -819,7 +819,7 @@ func updateReplicas(flags *pflag.FlagSet, serviceMode *swarm.ServiceMode) error
 	}
 
 	if serviceMode == nil || serviceMode.Replicated == nil {
-		return fmt.Errorf("replicas can only be used with replicated mode")
+		return errors.Errorf("replicas can only be used with replicated mode")
 	}
 	serviceMode.Replicated.Replicas = flags.Lookup(flagReplicas).Value.(*Uint64Opt).Value()
 	return nil
@@ -908,7 +908,7 @@ func updateHealthcheck(flags *pflag.FlagSet, containerSpec *swarm.ContainerSpec)
 			}
 			return nil
 		}
-		return fmt.Errorf("--%s conflicts with --health-* options", flagNoHealthcheck)
+		return errors.Errorf("--%s conflicts with --health-* options", flagNoHealthcheck)
 	}
 	if len(containerSpec.Healthcheck.Test) > 0 && containerSpec.Healthcheck.Test[0] == "NONE" {
 		containerSpec.Healthcheck.Test = nil

command/stack/deploy.go

@@ -52,9 +52,9 @@ func runDeploy(dockerCli *command.DockerCli, opts deployOptions) error {
 
 	switch {
 	case opts.bundlefile == "" && opts.composefile == "":
-		return fmt.Errorf("Please specify either a bundle file (with --bundle-file) or a Compose file (with --compose-file).")
+		return errors.Errorf("Please specify either a bundle file (with --bundle-file) or a Compose file (with --compose-file).")
 	case opts.bundlefile != "" && opts.composefile != "":
-		return fmt.Errorf("You cannot specify both a bundle file and a Compose file.")
+		return errors.Errorf("You cannot specify both a bundle file and a Compose file.")
 	case opts.bundlefile != "":
 		return deployBundle(ctx, dockerCli, opts)
 	default:

command/stack/deploy_composefile.go

@@ -28,7 +28,7 @@ func deployCompose(ctx context.Context, dockerCli *command.DockerCli, opts deplo
 	config, err := loader.Load(configDetails)
 	if err != nil {
 		if fpe, ok := err.(*loader.ForbiddenPropertiesError); ok {
-			return fmt.Errorf("Compose file contains unsupported options:\n\n%s\n",
+			return errors.Errorf("Compose file contains unsupported options:\n\n%s\n",
 				propertyWarnings(fpe.Properties))
 		}
 
@@ -168,12 +168,12 @@ func validateExternalNetworks(
 		network, err := client.NetworkInspect(ctx, networkName, false)
 		if err != nil {
 			if dockerclient.IsErrNetworkNotFound(err) {
-				return fmt.Errorf("network %q is declared as external, but could not be found. You need to create the network before the stack is deployed (with overlay driver)", networkName)
+				return errors.Errorf("network %q is declared as external, but could not be found. You need to create the network before the stack is deployed (with overlay driver)", networkName)
 			}
 			return err
 		}
 		if network.Scope != "swarm" {
-			return fmt.Errorf("network %q is declared as external, but it is not in the right scope: %q instead of %q", networkName, network.Scope, "swarm")
+			return errors.Errorf("network %q is declared as external, but it is not in the right scope: %q instead of %q", networkName, network.Scope, "swarm")
 		}
 	}
 

command/stack/list.go

@@ -12,6 +12,7 @@ import (
 	"github.com/docker/docker/cli/command"
 	"github.com/docker/docker/cli/compose/convert"
 	"github.com/docker/docker/client"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"golang.org/x/net/context"
 )
@@ -100,7 +101,7 @@ func getStacks(
 		labels := service.Spec.Labels
 		name, ok := labels[convert.LabelNamespace]
 		if !ok {
-			return nil, fmt.Errorf("cannot get label %s for service %s",
+			return nil, errors.Errorf("cannot get label %s for service %s",
 				convert.LabelNamespace, service.ID)
 		}
 		ztack, ok := m[name]

command/stack/opts.go

@@ -6,6 +6,7 @@ import (
 	"os"
 
 	"github.com/docker/docker/cli/command/bundlefile"
+	"github.com/pkg/errors"
 	"github.com/spf13/pflag"
 )
 
@@ -30,7 +31,7 @@ func loadBundlefile(stderr io.Writer, namespace string, path string) (*bundlefil
 		path = defaultPath
 	}
 	if _, err := os.Stat(path); err != nil {
-		return nil, fmt.Errorf(
+		return nil, errors.Errorf(
 			"Bundle %s not found. Specify the path with --file",
 			path)
 	}
@@ -44,7 +45,7 @@ func loadBundlefile(stderr io.Writer, namespace string, path string) (*bundlefil
 
 	bundle, err := bundlefile.LoadFile(reader)
 	if err != nil {
-		return nil, fmt.Errorf("Error reading %s: %v\n", path, err)
+		return nil, errors.Errorf("Error reading %s: %v\n", path, err)
 	}
 	return bundle, err
 }

command/stack/remove.go

@@ -7,6 +7,7 @@ import (
 	"github.com/docker/docker/api/types/swarm"
 	"github.com/docker/docker/cli"
 	"github.com/docker/docker/cli/command"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"golang.org/x/net/context"
 )
@@ -61,7 +62,7 @@ func runRemove(dockerCli *command.DockerCli, opts removeOptions) error {
 	hasError = removeNetworks(ctx, dockerCli, networks) || hasError
 
 	if hasError {
-		return fmt.Errorf("Failed to remove some resources")
+		return errors.Errorf("Failed to remove some resources")
 	}
 	return nil
 }

command/swarm/init.go

@@ -64,7 +64,7 @@ func runInit(dockerCli command.Cli, flags *pflag.FlagSet, opts initOptions) erro
 		case swarm.NodeAvailabilityActive, swarm.NodeAvailabilityPause, swarm.NodeAvailabilityDrain:
 			req.Availability = availability
 		default:
-			return fmt.Errorf("invalid availability %q, only active, pause and drain are supported", opts.availability)
+			return errors.Errorf("invalid availability %q, only active, pause and drain are supported", opts.availability)
 		}
 	}
 

command/swarm/init_test.go

@@ -11,6 +11,7 @@ import (
 	"github.com/docker/docker/cli/internal/test"
 	"github.com/docker/docker/pkg/testutil/assert"
 	"github.com/docker/docker/pkg/testutil/golden"
+	"github.com/pkg/errors"
 )
 
 func TestSwarmInitErrorOnAPIFailure(t *testing.T) {
@@ -26,28 +27,28 @@ func TestSwarmInitErrorOnAPIFailure(t *testing.T) {
 		{
 			name: "init-failed",
 			swarmInitFunc: func() (string, error) {
-				return "", fmt.Errorf("error initializing the swarm")
+				return "", errors.Errorf("error initializing the swarm")
 			},
 			expectedError: "error initializing the swarm",
 		},
 		{
 			name: "init-failed-with-ip-choice",
 			swarmInitFunc: func() (string, error) {
-				return "", fmt.Errorf("could not choose an IP address to advertise")
+				return "", errors.Errorf("could not choose an IP address to advertise")
 			},
 			expectedError: "could not choose an IP address to advertise - specify one with --advertise-addr",
 		},
 		{
 			name: "swarm-inspect-after-init-failed",
 			swarmInspectFunc: func() (swarm.Swarm, error) {
-				return swarm.Swarm{}, fmt.Errorf("error inspecting the swarm")
+				return swarm.Swarm{}, errors.Errorf("error inspecting the swarm")
 			},
 			expectedError: "error inspecting the swarm",
 		},
 		{
 			name: "node-inspect-after-init-failed",
 			nodeInspectFunc: func() (swarm.Node, []byte, error) {
-				return swarm.Node{}, []byte{}, fmt.Errorf("error inspecting the node")
+				return swarm.Node{}, []byte{}, errors.Errorf("error inspecting the node")
 			},
 			expectedError: "error inspecting the node",
 		},
@@ -57,7 +58,7 @@ func TestSwarmInitErrorOnAPIFailure(t *testing.T) {
 				flagAutolock: "true",
 			},
 			swarmGetUnlockKeyFunc: func() (types.SwarmUnlockKeyResponse, error) {
-				return types.SwarmUnlockKeyResponse{}, fmt.Errorf("error getting swarm unlock key")
+				return types.SwarmUnlockKeyResponse{}, errors.Errorf("error getting swarm unlock key")
 			},
 			expectedError: "could not fetch unlock key: error getting swarm unlock key",
 		},

command/swarm/join.go

@@ -9,6 +9,7 @@ import (
 	"github.com/docker/docker/api/types/swarm"
 	"github.com/docker/docker/cli"
 	"github.com/docker/docker/cli/command"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"github.com/spf13/pflag"
 )
@@ -61,7 +62,7 @@ func runJoin(dockerCli command.Cli, flags *pflag.FlagSet, opts joinOptions) erro
 		case swarm.NodeAvailabilityActive, swarm.NodeAvailabilityPause, swarm.NodeAvailabilityDrain:
 			req.Availability = availability
 		default:
-			return fmt.Errorf("invalid availability %q, only active, pause and drain are supported", opts.availability)
+			return errors.Errorf("invalid availability %q, only active, pause and drain are supported", opts.availability)
 		}
 	}
 

command/swarm/join_test.go

@@ -2,7 +2,6 @@ package swarm
 
 import (
 	"bytes"
-	"fmt"
 	"io/ioutil"
 	"strings"
 	"testing"
@@ -11,6 +10,7 @@ import (
 	"github.com/docker/docker/api/types/swarm"
 	"github.com/docker/docker/cli/internal/test"
 	"github.com/docker/docker/pkg/testutil/assert"
+	"github.com/pkg/errors"
 )
 
 func TestSwarmJoinErrors(t *testing.T) {
@@ -34,7 +34,7 @@ func TestSwarmJoinErrors(t *testing.T) {
 			name: "join-failed",
 			args: []string{"remote"},
 			swarmJoinFunc: func() error {
-				return fmt.Errorf("error joining the swarm")
+				return errors.Errorf("error joining the swarm")
 			},
 			expectedError: "error joining the swarm",
 		},
@@ -42,7 +42,7 @@ func TestSwarmJoinErrors(t *testing.T) {
 			name: "join-failed-on-init",
 			args: []string{"remote"},
 			infoFunc: func() (types.Info, error) {
-				return types.Info{}, fmt.Errorf("error asking for node info")
+				return types.Info{}, errors.Errorf("error asking for node info")
 			},
 			expectedError: "error asking for node info",
 		},

command/swarm/join_token.go

@@ -1,14 +1,13 @@
 package swarm
 
 import (
-	"errors"
 	"fmt"
 
-	"github.com/spf13/cobra"
-
 	"github.com/docker/docker/api/types/swarm"
 	"github.com/docker/docker/cli"
 	"github.com/docker/docker/cli/command"
+	"github.com/pkg/errors"
+	"github.com/spf13/cobra"
 	"golang.org/x/net/context"
 )
 

command/swarm/join_token_test.go

@@ -9,6 +9,7 @@ import (
 	"github.com/docker/docker/api/types"
 	"github.com/docker/docker/api/types/swarm"
 	"github.com/docker/docker/cli/internal/test"
+	"github.com/pkg/errors"
 	// Import builders to get the builder function as package function
 	. "github.com/docker/docker/cli/internal/test/builders"
 	"github.com/docker/docker/pkg/testutil/assert"
@@ -44,7 +45,7 @@ func TestSwarmJoinTokenErrors(t *testing.T) {
 			name: "swarm-inspect-failed",
 			args: []string{"worker"},
 			swarmInspectFunc: func() (swarm.Swarm, error) {
-				return swarm.Swarm{}, fmt.Errorf("error inspecting the swarm")
+				return swarm.Swarm{}, errors.Errorf("error inspecting the swarm")
 			},
 			expectedError: "error inspecting the swarm",
 		},
@@ -55,7 +56,7 @@ func TestSwarmJoinTokenErrors(t *testing.T) {
 				flagRotate: "true",
 			},
 			swarmInspectFunc: func() (swarm.Swarm, error) {
-				return swarm.Swarm{}, fmt.Errorf("error inspecting the swarm")
+				return swarm.Swarm{}, errors.Errorf("error inspecting the swarm")
 			},
 			expectedError: "error inspecting the swarm",
 		},
@@ -66,7 +67,7 @@ func TestSwarmJoinTokenErrors(t *testing.T) {
 				flagRotate: "true",
 			},
 			swarmUpdateFunc: func(swarm swarm.Spec, flags swarm.UpdateFlags) error {
-				return fmt.Errorf("error updating the swarm")
+				return errors.Errorf("error updating the swarm")
 			},
 			expectedError: "error updating the swarm",
 		},
@@ -74,7 +75,7 @@ func TestSwarmJoinTokenErrors(t *testing.T) {
 			name: "node-inspect-failed",
 			args: []string{"worker"},
 			nodeInspectFunc: func() (swarm.Node, []byte, error) {
-				return swarm.Node{}, []byte{}, fmt.Errorf("error inspecting node")
+				return swarm.Node{}, []byte{}, errors.Errorf("error inspecting node")
 			},
 			expectedError: "error inspecting node",
 		},
@@ -82,7 +83,7 @@ func TestSwarmJoinTokenErrors(t *testing.T) {
 			name: "info-failed",
 			args: []string{"worker"},
 			infoFunc: func() (types.Info, error) {
-				return types.Info{}, fmt.Errorf("error asking for node info")
+				return types.Info{}, errors.Errorf("error asking for node info")
 			},
 			expectedError: "error asking for node info",
 		},

command/swarm/leave_test.go

@@ -2,13 +2,13 @@ package swarm
 
 import (
 	"bytes"
-	"fmt"
 	"io/ioutil"
 	"strings"
 	"testing"
 
 	"github.com/docker/docker/cli/internal/test"
 	"github.com/docker/docker/pkg/testutil/assert"
+	"github.com/pkg/errors"
 )
 
 func TestSwarmLeaveErrors(t *testing.T) {
@@ -26,7 +26,7 @@ func TestSwarmLeaveErrors(t *testing.T) {
 		{
 			name: "leave-failed",
 			swarmLeaveFunc: func() error {
-				return fmt.Errorf("error leaving the swarm")
+				return errors.Errorf("error leaving the swarm")
 			},
 			expectedError: "error leaving the swarm",
 		},

command/swarm/opts.go

@@ -2,13 +2,13 @@ package swarm
 
 import (
 	"encoding/csv"
-	"errors"
 	"fmt"
 	"strings"
 	"time"
 
 	"github.com/docker/docker/api/types/swarm"
 	"github.com/docker/docker/opts"
+	"github.com/pkg/errors"
 	"github.com/spf13/pflag"
 )
 
@@ -139,7 +139,7 @@ func parseExternalCA(caSpec string) (*swarm.ExternalCA, error) {
 		parts := strings.SplitN(field, "=", 2)
 
 		if len(parts) != 2 {
-			return nil, fmt.Errorf("invalid field '%s' must be a key=value pair", field)
+			return nil, errors.Errorf("invalid field '%s' must be a key=value pair", field)
 		}
 
 		key, value := parts[0], parts[1]
@@ -150,7 +150,7 @@ func parseExternalCA(caSpec string) (*swarm.ExternalCA, error) {
 			if strings.ToLower(value) == string(swarm.ExternalCAProtocolCFSSL) {
 				externalCA.Protocol = swarm.ExternalCAProtocolCFSSL
 			} else {
-				return nil, fmt.Errorf("unrecognized external CA protocol %s", value)
+				return nil, errors.Errorf("unrecognized external CA protocol %s", value)
 			}
 		case "url":
 			hasURL = true

command/swarm/unlock.go

@@ -2,17 +2,16 @@ package swarm
 
 import (
 	"bufio"
-	"errors"
 	"fmt"
 	"io"
 	"strings"
 
-	"github.com/spf13/cobra"
-	"golang.org/x/crypto/ssh/terminal"
-
 	"github.com/docker/docker/api/types/swarm"
 	"github.com/docker/docker/cli"
 	"github.com/docker/docker/cli/command"
+	"github.com/pkg/errors"
+	"github.com/spf13/cobra"
+	"golang.org/x/crypto/ssh/terminal"
 	"golang.org/x/net/context"
 )
 

command/swarm/unlock_key_test.go

@@ -9,6 +9,7 @@ import (
 	"github.com/docker/docker/api/types"
 	"github.com/docker/docker/api/types/swarm"
 	"github.com/docker/docker/cli/internal/test"
+	"github.com/pkg/errors"
 	// Import builders to get the builder function as package function
 	. "github.com/docker/docker/cli/internal/test/builders"
 	"github.com/docker/docker/pkg/testutil/assert"
@@ -36,7 +37,7 @@ func TestSwarmUnlockKeyErrors(t *testing.T) {
 				flagRotate: "true",
 			},
 			swarmInspectFunc: func() (swarm.Swarm, error) {
-				return swarm.Swarm{}, fmt.Errorf("error inspecting the swarm")
+				return swarm.Swarm{}, errors.Errorf("error inspecting the swarm")
 			},
 			expectedError: "error inspecting the swarm",
 		},
@@ -59,14 +60,14 @@ func TestSwarmUnlockKeyErrors(t *testing.T) {
 				return *Swarm(Autolock()), nil
 			},
 			swarmUpdateFunc: func(swarm swarm.Spec, flags swarm.UpdateFlags) error {
-				return fmt.Errorf("error updating the swarm")
+				return errors.Errorf("error updating the swarm")
 			},
 			expectedError: "error updating the swarm",
 		},
 		{
 			name: "swarm-get-unlock-key-failed",
 			swarmGetUnlockKeyFunc: func() (types.SwarmUnlockKeyResponse, error) {
-				return types.SwarmUnlockKeyResponse{}, fmt.Errorf("error getting unlock key")
+				return types.SwarmUnlockKeyResponse{}, errors.Errorf("error getting unlock key")
 			},
 			expectedError: "error getting unlock key",
 		},

command/swarm/unlock_test.go

@@ -2,7 +2,6 @@ package swarm
 
 import (
 	"bytes"
-	"fmt"
 	"io/ioutil"
 	"strings"
 	"testing"
@@ -11,6 +10,7 @@ import (
 	"github.com/docker/docker/api/types/swarm"
 	"github.com/docker/docker/cli/internal/test"
 	"github.com/docker/docker/pkg/testutil/assert"
+	"github.com/pkg/errors"
 )
 
 func TestSwarmUnlockErrors(t *testing.T) {
@@ -59,7 +59,7 @@ func TestSwarmUnlockErrors(t *testing.T) {
 				}, nil
 			},
 			swarmUnlockFunc: func(req swarm.UnlockRequest) error {
-				return fmt.Errorf("error unlocking the swarm")
+				return errors.Errorf("error unlocking the swarm")
 			},
 			expectedError: "error unlocking the swarm",
 		},
@@ -90,7 +90,7 @@ func TestSwarmUnlock(t *testing.T) {
 		},
 		swarmUnlockFunc: func(req swarm.UnlockRequest) error {
 			if req.UnlockKey != input {
-				return fmt.Errorf("Invalid unlock key")
+				return errors.Errorf("Invalid unlock key")
 			}
 			return nil
 		},

command/swarm/update_test.go

@@ -10,6 +10,7 @@ import (
 	"github.com/docker/docker/api/types"
 	"github.com/docker/docker/api/types/swarm"
 	"github.com/docker/docker/cli/internal/test"
+	"github.com/pkg/errors"
 	// Import builders to get the builder function as package function
 	. "github.com/docker/docker/cli/internal/test/builders"
 	"github.com/docker/docker/pkg/testutil/assert"
@@ -37,7 +38,7 @@ func TestSwarmUpdateErrors(t *testing.T) {
 				flagTaskHistoryLimit: "10",
 			},
 			swarmInspectFunc: func() (swarm.Swarm, error) {
-				return swarm.Swarm{}, fmt.Errorf("error inspecting the swarm")
+				return swarm.Swarm{}, errors.Errorf("error inspecting the swarm")
 			},
 			expectedError: "error inspecting the swarm",
 		},
@@ -47,7 +48,7 @@ func TestSwarmUpdateErrors(t *testing.T) {
 				flagTaskHistoryLimit: "10",
 			},
 			swarmUpdateFunc: func(swarm swarm.Spec, flags swarm.UpdateFlags) error {
-				return fmt.Errorf("error updating the swarm")
+				return errors.Errorf("error updating the swarm")
 			},
 			expectedError: "error updating the swarm",
 		},
@@ -60,7 +61,7 @@ func TestSwarmUpdateErrors(t *testing.T) {
 				return *Swarm(), nil
 			},
 			swarmGetUnlockKeyFunc: func() (types.SwarmUnlockKeyResponse, error) {
-				return types.SwarmUnlockKeyResponse{}, fmt.Errorf("error getting unlock key")
+				return types.SwarmUnlockKeyResponse{}, errors.Errorf("error getting unlock key")
 			},
 			expectedError: "error getting unlock key",
 		},
@@ -108,33 +109,33 @@ func TestSwarmUpdate(t *testing.T) {
 			},
 			swarmUpdateFunc: func(swarm swarm.Spec, flags swarm.UpdateFlags) error {
 				if *swarm.Orchestration.TaskHistoryRetentionLimit != 10 {
-					return fmt.Errorf("historyLimit not correctly set")
+					return errors.Errorf("historyLimit not correctly set")
 				}
 				heartbeatDuration, err := time.ParseDuration("10s")
 				if err != nil {
 					return err
 				}
 				if swarm.Dispatcher.HeartbeatPeriod != heartbeatDuration {
-					return fmt.Errorf("heartbeatPeriodLimit not correctly set")
+					return errors.Errorf("heartbeatPeriodLimit not correctly set")
 				}
 				certExpiryDuration, err := time.ParseDuration("20s")
 				if err != nil {
 					return err
 				}
 				if swarm.CAConfig.NodeCertExpiry != certExpiryDuration {
-					return fmt.Errorf("certExpiry not correctly set")
+					return errors.Errorf("certExpiry not correctly set")
 				}
 				if len(swarm.CAConfig.ExternalCAs) != 1 {
-					return fmt.Errorf("externalCA not correctly set")
+					return errors.Errorf("externalCA not correctly set")
 				}
 				if *swarm.Raft.KeepOldSnapshots != 10 {
-					return fmt.Errorf("keepOldSnapshots not correctly set")
+					return errors.Errorf("keepOldSnapshots not correctly set")
 				}
 				if swarm.Raft.SnapshotInterval != 100 {
-					return fmt.Errorf("snapshotInterval not correctly set")
+					return errors.Errorf("snapshotInterval not correctly set")
 				}
 				if !swarm.EncryptionConfig.AutoLockManagers {
-					return fmt.Errorf("autolock not correctly set")
+					return errors.Errorf("autolock not correctly set")
 				}
 				return nil
 			},
@@ -147,7 +148,7 @@ func TestSwarmUpdate(t *testing.T) {
 			},
 			swarmUpdateFunc: func(swarm swarm.Spec, flags swarm.UpdateFlags) error {
 				if *swarm.Orchestration.TaskHistoryRetentionLimit != 10 {
-					return fmt.Errorf("historyLimit not correctly set")
+					return errors.Errorf("historyLimit not correctly set")
 				}
 				return nil
 			},

command/system/inspect.go

@@ -10,6 +10,7 @@ import (
 	"github.com/docker/docker/cli/command"
 	"github.com/docker/docker/cli/command/inspect"
 	apiclient "github.com/docker/docker/client"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 )
 
@@ -48,7 +49,7 @@ func runInspect(dockerCli *command.DockerCli, opts inspectOptions) error {
 	case "", "container", "image", "node", "network", "service", "volume", "task", "plugin":
 		elementSearcher = inspectAll(context.Background(), dockerCli, opts.size, opts.inspectType)
 	default:
-		return fmt.Errorf("%q is not a valid value for --type", opts.inspectType)
+		return errors.Errorf("%q is not a valid value for --type", opts.inspectType)
 	}
 	return inspect.Inspect(dockerCli.Out(), opts.ids, opts.format, elementSearcher)
 }
@@ -198,6 +199,6 @@ func inspectAll(ctx context.Context, dockerCli *command.DockerCli, getSize bool,
 			}
 			return v, raw, err
 		}
-		return nil, nil, fmt.Errorf("Error: No such object: %s", ref)
+		return nil, nil, errors.Errorf("Error: No such object: %s", ref)
 	}
 }

command/volume/create.go

@@ -8,6 +8,7 @@ import (
 	"github.com/docker/docker/cli/command"
 	"github.com/docker/docker/opts"
 	runconfigopts "github.com/docker/docker/runconfig/opts"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"golang.org/x/net/context"
 )
@@ -32,7 +33,7 @@ func newCreateCommand(dockerCli command.Cli) *cobra.Command {
 		RunE: func(cmd *cobra.Command, args []string) error {
 			if len(args) == 1 {
 				if opts.name != "" {
-					return fmt.Errorf("Conflicting options: either specify --name or provide positional arg, not both\n")
+					return errors.Errorf("Conflicting options: either specify --name or provide positional arg, not both\n")
 				}
 				opts.name = args[0]
 			}

command/volume/create_test.go

@@ -2,7 +2,6 @@ package volume
 
 import (
 	"bytes"
-	"fmt"
 	"io/ioutil"
 	"strings"
 	"testing"
@@ -11,6 +10,7 @@ import (
 	volumetypes "github.com/docker/docker/api/types/volume"
 	"github.com/docker/docker/cli/internal/test"
 	"github.com/docker/docker/pkg/testutil/assert"
+	"github.com/pkg/errors"
 )
 
 func TestVolumeCreateErrors(t *testing.T) {
@@ -33,7 +33,7 @@ func TestVolumeCreateErrors(t *testing.T) {
 		},
 		{
 			volumeCreateFunc: func(createBody volumetypes.VolumesCreateBody) (types.Volume, error) {
-				return types.Volume{}, fmt.Errorf("error creating volume")
+				return types.Volume{}, errors.Errorf("error creating volume")
 			},
 			expectedError: "error creating volume",
 		},
@@ -60,7 +60,7 @@ func TestVolumeCreateWithName(t *testing.T) {
 	cli := test.NewFakeCli(&fakeClient{
 		volumeCreateFunc: func(body volumetypes.VolumesCreateBody) (types.Volume, error) {
 			if body.Name != name {
-				return types.Volume{}, fmt.Errorf("expected name %q, got %q", name, body.Name)
+				return types.Volume{}, errors.Errorf("expected name %q, got %q", name, body.Name)
 			}
 			return types.Volume{
 				Name: body.Name,
@@ -98,16 +98,16 @@ func TestVolumeCreateWithFlags(t *testing.T) {
 	cli := test.NewFakeCli(&fakeClient{
 		volumeCreateFunc: func(body volumetypes.VolumesCreateBody) (types.Volume, error) {
 			if body.Name != "" {
-				return types.Volume{}, fmt.Errorf("expected empty name, got %q", body.Name)
+				return types.Volume{}, errors.Errorf("expected empty name, got %q", body.Name)
 			}
 			if body.Driver != expectedDriver {
-				return types.Volume{}, fmt.Errorf("expected driver %q, got %q", expectedDriver, body.Driver)
+				return types.Volume{}, errors.Errorf("expected driver %q, got %q", expectedDriver, body.Driver)
 			}
 			if !compareMap(body.DriverOpts, expectedOpts) {
-				return types.Volume{}, fmt.Errorf("expected drivers opts %v, got %v", expectedOpts, body.DriverOpts)
+				return types.Volume{}, errors.Errorf("expected drivers opts %v, got %v", expectedOpts, body.DriverOpts)
 			}
 			if !compareMap(body.Labels, expectedLabels) {
-				return types.Volume{}, fmt.Errorf("expected labels %v, got %v", expectedLabels, body.Labels)
+				return types.Volume{}, errors.Errorf("expected labels %v, got %v", expectedLabels, body.Labels)
 			}
 			return types.Volume{
 				Name: name,

command/volume/inspect_test.go

@@ -8,6 +8,7 @@ import (
 
 	"github.com/docker/docker/api/types"
 	"github.com/docker/docker/cli/internal/test"
+	"github.com/pkg/errors"
 	// Import builders to get the builder function as package function
 	. "github.com/docker/docker/cli/internal/test/builders"
 	"github.com/docker/docker/pkg/testutil/assert"
@@ -27,7 +28,7 @@ func TestVolumeInspectErrors(t *testing.T) {
 		{
 			args: []string{"foo"},
 			volumeInspectFunc: func(volumeID string) (types.Volume, error) {
-				return types.Volume{}, fmt.Errorf("error while inspecting the volume")
+				return types.Volume{}, errors.Errorf("error while inspecting the volume")
 			},
 			expectedError: "error while inspecting the volume",
 		},
@@ -46,7 +47,7 @@ func TestVolumeInspectErrors(t *testing.T) {
 						Name: "foo",
 					}, nil
 				}
-				return types.Volume{}, fmt.Errorf("error while inspecting the volume")
+				return types.Volume{}, errors.Errorf("error while inspecting the volume")
 			},
 			expectedError: "error while inspecting the volume",
 		},
@@ -78,7 +79,7 @@ func TestVolumeInspectWithoutFormat(t *testing.T) {
 			args: []string{"foo"},
 			volumeInspectFunc: func(volumeID string) (types.Volume, error) {
 				if volumeID != "foo" {
-					return types.Volume{}, fmt.Errorf("Invalid volumeID, expected %s, got %s", "foo", volumeID)
+					return types.Volume{}, errors.Errorf("Invalid volumeID, expected %s, got %s", "foo", volumeID)
 				}
 				return *Volume(), nil
 			},

command/volume/list_test.go

@@ -2,7 +2,6 @@ package volume
 
 import (
 	"bytes"
-	"fmt"
 	"io/ioutil"
 	"testing"
 
@@ -11,6 +10,7 @@ import (
 	volumetypes "github.com/docker/docker/api/types/volume"
 	"github.com/docker/docker/cli/config/configfile"
 	"github.com/docker/docker/cli/internal/test"
+	"github.com/pkg/errors"
 	// Import builders to get the builder function as package function
 	. "github.com/docker/docker/cli/internal/test/builders"
 	"github.com/docker/docker/pkg/testutil/assert"
@@ -30,7 +30,7 @@ func TestVolumeListErrors(t *testing.T) {
 		},
 		{
 			volumeListFunc: func(filter filters.Args) (volumetypes.VolumesListOKBody, error) {
-				return volumetypes.VolumesListOKBody{}, fmt.Errorf("error listing volumes")
+				return volumetypes.VolumesListOKBody{}, errors.Errorf("error listing volumes")
 			},
 			expectedError: "error listing volumes",
 		},

command/volume/prune_test.go

@@ -13,6 +13,7 @@ import (
 	"github.com/docker/docker/cli/internal/test"
 	"github.com/docker/docker/pkg/testutil/assert"
 	"github.com/docker/docker/pkg/testutil/golden"
+	"github.com/pkg/errors"
 )
 
 func TestVolumePruneErrors(t *testing.T) {
@@ -31,7 +32,7 @@ func TestVolumePruneErrors(t *testing.T) {
 				"force": "true",
 			},
 			volumePruneFunc: func(args filters.Args) (types.VolumesPruneReport, error) {
-				return types.VolumesPruneReport{}, fmt.Errorf("error pruning volumes")
+				return types.VolumesPruneReport{}, errors.Errorf("error pruning volumes")
 			},
 			expectedError: "error pruning volumes",
 		},

command/volume/remove.go

@@ -6,6 +6,7 @@ import (
 
 	"github.com/docker/docker/cli"
 	"github.com/docker/docker/cli/command"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"golang.org/x/net/context"
 )
@@ -53,7 +54,7 @@ func runRemove(dockerCli command.Cli, opts *removeOptions) error {
 	}
 
 	if len(errs) > 0 {
-		return fmt.Errorf("%s", strings.Join(errs, "\n"))
+		return errors.Errorf("%s", strings.Join(errs, "\n"))
 	}
 	return nil
 }

command/volume/remove_test.go

@@ -2,12 +2,12 @@ package volume
 
 import (
 	"bytes"
-	"fmt"
 	"io/ioutil"
 	"testing"
 
 	"github.com/docker/docker/cli/internal/test"
 	"github.com/docker/docker/pkg/testutil/assert"
+	"github.com/pkg/errors"
 )
 
 func TestVolumeRemoveErrors(t *testing.T) {
@@ -22,7 +22,7 @@ func TestVolumeRemoveErrors(t *testing.T) {
 		{
 			args: []string{"nodeID"},
 			volumeRemoveFunc: func(volumeID string, force bool) error {
-				return fmt.Errorf("error removing the volume")
+				return errors.Errorf("error removing the volume")
 			},
 			expectedError: "error removing the volume",
 		},

compose/convert/service.go

@@ -261,7 +261,7 @@ func convertHealthcheck(healthcheck *composetypes.HealthCheckConfig) (*container
 	)
 	if healthcheck.Disable {
 		if len(healthcheck.Test) != 0 {
-			return nil, fmt.Errorf("test and disable can't be set at the same time")
+			return nil, errors.Errorf("test and disable can't be set at the same time")
 		}
 		return &container.HealthConfig{
 			Test: []string{"NONE"},
@@ -312,7 +312,7 @@ func convertRestartPolicy(restart string, source *composetypes.RestartPolicy) (*
 				MaxAttempts: &attempts,
 			}, nil
 		default:
-			return nil, fmt.Errorf("unknown restart policy: %s", restart)
+			return nil, errors.Errorf("unknown restart policy: %s", restart)
 		}
 	}
 	return &swarm.RestartPolicy{
@@ -418,13 +418,13 @@ func convertDeployMode(mode string, replicas *uint64) (swarm.ServiceMode, error)
 	switch mode {
 	case "global":
 		if replicas != nil {
-			return serviceMode, fmt.Errorf("replicas can only be used with replicated mode")
+			return serviceMode, errors.Errorf("replicas can only be used with replicated mode")
 		}
 		serviceMode.Global = &swarm.GlobalService{}
 	case "replicated", "":
 		serviceMode.Replicated = &swarm.ReplicatedService{Replicas: replicas}
 	default:
-		return serviceMode, fmt.Errorf("Unknown mode: %s", mode)
+		return serviceMode, errors.Errorf("Unknown mode: %s", mode)
 	}
 	return serviceMode, nil
 }

compose/loader/loader.go

@@ -19,6 +19,7 @@ import (
 	units "github.com/docker/go-units"
 	shellwords "github.com/mattn/go-shellwords"
 	"github.com/mitchellh/mapstructure"
+	"github.com/pkg/errors"
 	yaml "gopkg.in/yaml.v2"
 )
 
@@ -35,7 +36,7 @@ func ParseYAML(source []byte) (map[string]interface{}, error) {
 	}
 	cfgMap, ok := cfg.(map[interface{}]interface{})
 	if !ok {
-		return nil, fmt.Errorf("Top-level object must be a mapping")
+		return nil, errors.Errorf("Top-level object must be a mapping")
 	}
 	converted, err := convertToStringKeysRecursive(cfgMap, "")
 	if err != nil {
@@ -47,10 +48,10 @@ func ParseYAML(source []byte) (map[string]interface{}, error) {
 // Load reads a ConfigDetails and returns a fully loaded configuration
 func Load(configDetails types.ConfigDetails) (*types.Config, error) {
 	if len(configDetails.ConfigFiles) < 1 {
-		return nil, fmt.Errorf("No files specified")
+		return nil, errors.Errorf("No files specified")
 	}
 	if len(configDetails.ConfigFiles) > 1 {
-		return nil, fmt.Errorf("Multiple files are not yet supported")
+		return nil, errors.Errorf("Multiple files are not yet supported")
 	}
 
 	configDict := getConfigDict(configDetails)
@@ -309,7 +310,7 @@ func formatInvalidKeyError(keyPrefix string, key interface{}) error {
 	} else {
 		location = fmt.Sprintf("in %s", keyPrefix)
 	}
-	return fmt.Errorf("Non-string key %s: %#v", location, key)
+	return errors.Errorf("Non-string key %s: %#v", location, key)
 }
 
 // LoadServices produces a ServiceConfig map from a compose file Dict
@@ -414,7 +415,7 @@ func transformUlimits(data interface{}) (interface{}, error) {
 		ulimit.Hard = value["hard"].(int)
 		return ulimit, nil
 	default:
-		return data, fmt.Errorf("invalid type %T for ulimits", value)
+		return data, errors.Errorf("invalid type %T for ulimits", value)
 	}
 }
 
@@ -435,6 +436,12 @@ func LoadNetworks(source map[string]interface{}) (map[string]types.NetworkConfig
 	return networks, nil
 }
 
+func externalVolumeError(volume, key string) error {
+	return errors.Errorf(
+		"conflicting parameters \"external\" and %q specified for volume %q",
+		key, volume)
+}
+
 // LoadVolumes produces a VolumeConfig map from a compose file Dict
 // the source Dict is not validated if directly used. Use Load() to enable validation
 func LoadVolumes(source map[string]interface{}) (map[string]types.VolumeConfig, error) {
@@ -445,15 +452,14 @@ func LoadVolumes(source map[string]interface{}) (map[string]types.VolumeConfig,
 	}
 	for name, volume := range volumes {
 		if volume.External.External {
-			template := "conflicting parameters \"external\" and %q specified for volume %q"
 			if volume.Driver != "" {
-				return nil, fmt.Errorf(template, "driver", name)
+				return nil, externalVolumeError(name, "driver")
 			}
 			if len(volume.DriverOpts) > 0 {
-				return nil, fmt.Errorf(template, "driver_opts", name)
+				return nil, externalVolumeError(name, "driver_opts")
 			}
 			if len(volume.Labels) > 0 {
-				return nil, fmt.Errorf(template, "labels", name)
+				return nil, externalVolumeError(name, "labels")
 			}
 			if volume.External.Name == "" {
 				volume.External.Name = name
@@ -497,7 +503,7 @@ func transformMapStringString(data interface{}) (interface{}, error) {
 	case map[string]string:
 		return value, nil
 	default:
-		return data, fmt.Errorf("invalid type %T for map[string]string", value)
+		return data, errors.Errorf("invalid type %T for map[string]string", value)
 	}
 }
 
@@ -508,7 +514,7 @@ func transformExternal(data interface{}) (interface{}, error) {
 	case map[string]interface{}:
 		return map[string]interface{}{"external": true, "name": value["name"]}, nil
 	default:
-		return data, fmt.Errorf("invalid type %T for external", value)
+		return data, errors.Errorf("invalid type %T for external", value)
 	}
 }
 
@@ -536,12 +542,12 @@ func transformServicePort(data interface{}) (interface{}, error) {
 			case map[string]interface{}:
 				ports = append(ports, value)
 			default:
-				return data, fmt.Errorf("invalid type %T for port", value)
+				return data, errors.Errorf("invalid type %T for port", value)
 			}
 		}
 		return ports, nil
 	default:
-		return data, fmt.Errorf("invalid type %T for port", entries)
+		return data, errors.Errorf("invalid type %T for port", entries)
 	}
 }
 
@@ -552,7 +558,7 @@ func transformServiceSecret(data interface{}) (interface{}, error) {
 	case map[string]interface{}:
 		return data, nil
 	default:
-		return data, fmt.Errorf("invalid type %T for secret", value)
+		return data, errors.Errorf("invalid type %T for secret", value)
 	}
 }
 
@@ -563,7 +569,7 @@ func transformServiceVolumeConfig(data interface{}) (interface{}, error) {
 	case map[string]interface{}:
 		return data, nil
 	default:
-		return data, fmt.Errorf("invalid type %T for service volume", value)
+		return data, errors.Errorf("invalid type %T for service volume", value)
 	}
 
 }
@@ -595,7 +601,7 @@ func transformStringList(data interface{}) (interface{}, error) {
 	case []interface{}:
 		return value, nil
 	default:
-		return data, fmt.Errorf("invalid type %T for string list", value)
+		return data, errors.Errorf("invalid type %T for string list", value)
 	}
 }
 
@@ -619,7 +625,7 @@ func transformMappingOrList(mappingOrList interface{}, sep string, allowNil bool
 		}
 		return result
 	}
-	panic(fmt.Errorf("expected a map or a list, got %T: %#v", mappingOrList, mappingOrList))
+	panic(errors.Errorf("expected a map or a list, got %T: %#v", mappingOrList, mappingOrList))
 }
 
 func transformShellCommand(value interface{}) (interface{}, error) {
@@ -636,7 +642,7 @@ func transformHealthCheckTest(data interface{}) (interface{}, error) {
 	case []interface{}:
 		return value, nil
 	default:
-		return value, fmt.Errorf("invalid type %T for healthcheck.test", value)
+		return value, errors.Errorf("invalid type %T for healthcheck.test", value)
 	}
 }
 
@@ -647,7 +653,7 @@ func transformSize(value interface{}) (int64, error) {
 	case string:
 		return units.RAMInBytes(value)
 	}
-	panic(fmt.Errorf("invalid type for size %T", value))
+	panic(errors.Errorf("invalid type for size %T", value))
 }
 
 func toServicePortConfigs(value string) ([]interface{}, error) {

config/config.go

@@ -1,7 +1,6 @@
 package config
 
 import (
-	"fmt"
 	"io"
 	"os"
 	"path/filepath"
@@ -9,6 +8,7 @@ import (
 	"github.com/docker/docker/api/types"
 	"github.com/docker/docker/cli/config/configfile"
 	"github.com/docker/docker/pkg/homedir"
+	"github.com/pkg/errors"
 )
 
 const (
@@ -84,18 +84,18 @@ func Load(configDir string) (*configfile.ConfigFile, error) {
 	if _, err := os.Stat(configFile.Filename); err == nil {
 		file, err := os.Open(configFile.Filename)
 		if err != nil {
-			return &configFile, fmt.Errorf("%s - %v", configFile.Filename, err)
+			return &configFile, errors.Errorf("%s - %v", configFile.Filename, err)
 		}
 		defer file.Close()
 		err = configFile.LoadFromReader(file)
 		if err != nil {
-			err = fmt.Errorf("%s - %v", configFile.Filename, err)
+			err = errors.Errorf("%s - %v", configFile.Filename, err)
 		}
 		return &configFile, err
 	} else if !os.IsNotExist(err) {
 		// if file is there but we can't stat it for any reason other
 		// than it doesn't exist then stop
-		return &configFile, fmt.Errorf("%s - %v", configFile.Filename, err)
+		return &configFile, errors.Errorf("%s - %v", configFile.Filename, err)
 	}
 
 	// Can't find latest config file so check for the old one
@@ -105,12 +105,12 @@ func Load(configDir string) (*configfile.ConfigFile, error) {
 	}
 	file, err := os.Open(confFile)
 	if err != nil {
-		return &configFile, fmt.Errorf("%s - %v", confFile, err)
+		return &configFile, errors.Errorf("%s - %v", confFile, err)
 	}
 	defer file.Close()
 	err = configFile.LegacyLoadFromReader(file)
 	if err != nil {
-		return &configFile, fmt.Errorf("%s - %v", confFile, err)
+		return &configFile, errors.Errorf("%s - %v", confFile, err)
 	}
 
 	if configFile.HTTPHeaders == nil {

config/configfile/file.go

@@ -3,7 +3,6 @@ package configfile
 import (
 	"encoding/base64"
 	"encoding/json"
-	"fmt"
 	"io"
 	"io/ioutil"
 	"os"
@@ -11,6 +10,7 @@ import (
 	"strings"
 
 	"github.com/docker/docker/api/types"
+	"github.com/pkg/errors"
 )
 
 const (
@@ -51,12 +51,12 @@ func (configFile *ConfigFile) LegacyLoadFromReader(configData io.Reader) error {
 	if err := json.Unmarshal(b, &configFile.AuthConfigs); err != nil {
 		arr := strings.Split(string(b), "\n")
 		if len(arr) < 2 {
-			return fmt.Errorf("The Auth config file is empty")
+			return errors.Errorf("The Auth config file is empty")
 		}
 		authConfig := types.AuthConfig{}
 		origAuth := strings.Split(arr[0], " = ")
 		if len(origAuth) != 2 {
-			return fmt.Errorf("Invalid Auth config file")
+			return errors.Errorf("Invalid Auth config file")
 		}
 		authConfig.Username, authConfig.Password, err = decodeAuth(origAuth[1])
 		if err != nil {
@@ -135,7 +135,7 @@ func (configFile *ConfigFile) SaveToWriter(writer io.Writer) error {
 // Save encodes and writes out all the authorization information
 func (configFile *ConfigFile) Save() error {
 	if configFile.Filename == "" {
-		return fmt.Errorf("Can't save config with empty filename")
+		return errors.Errorf("Can't save config with empty filename")
 	}
 
 	if err := os.MkdirAll(filepath.Dir(configFile.Filename), 0700); err != nil {
@@ -176,11 +176,11 @@ func decodeAuth(authStr string) (string, string, error) {
 		return "", "", err
 	}
 	if n > decLen {
-		return "", "", fmt.Errorf("Something went wrong decoding auth config")
+		return "", "", errors.Errorf("Something went wrong decoding auth config")
 	}
 	arr := strings.SplitN(string(decoded), ":", 2)
 	if len(arr) != 2 {
-		return "", "", fmt.Errorf("Invalid auth configuration file")
+		return "", "", errors.Errorf("Invalid auth configuration file")
 	}
 	password := strings.Trim(arr[1], "\x00")
 	return arr[0], password, nil

config/credentials/native_store_test.go

@@ -11,6 +11,7 @@ import (
 	"github.com/docker/docker-credential-helpers/client"
 	"github.com/docker/docker-credential-helpers/credentials"
 	"github.com/docker/docker/api/types"
+	"github.com/pkg/errors"
 )
 
 const (
@@ -20,7 +21,7 @@ const (
 	missingCredsAddress  = "https://missing.docker.io/v1"
 )
 
-var errCommandExited = fmt.Errorf("exited 1")
+var errCommandExited = errors.Errorf("exited 1")
 
 // mockCommand simulates interactions between the docker client and a remote
 // credentials helper.

required.go

@@ -1,9 +1,9 @@
 package cli
 
 import (
-	"fmt"
 	"strings"
 
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 )
 
@@ -14,10 +14,10 @@ func NoArgs(cmd *cobra.Command, args []string) error {
 	}
 
 	if cmd.HasSubCommands() {
-		return fmt.Errorf("\n" + strings.TrimRight(cmd.UsageString(), "\n"))
+		return errors.Errorf("\n" + strings.TrimRight(cmd.UsageString(), "\n"))
 	}
 
-	return fmt.Errorf(
+	return errors.Errorf(
 		"\"%s\" accepts no argument(s).\nSee '%s --help'.\n\nUsage:  %s\n\n%s",
 		cmd.CommandPath(),
 		cmd.CommandPath(),
@@ -32,7 +32,7 @@ func RequiresMinArgs(min int) cobra.PositionalArgs {
 		if len(args) >= min {
 			return nil
 		}
-		return fmt.Errorf(
+		return errors.Errorf(
 			"\"%s\" requires at least %d argument(s).\nSee '%s --help'.\n\nUsage:  %s\n\n%s",
 			cmd.CommandPath(),
 			min,
@@ -49,7 +49,7 @@ func RequiresMaxArgs(max int) cobra.PositionalArgs {
 		if len(args) <= max {
 			return nil
 		}
-		return fmt.Errorf(
+		return errors.Errorf(
 			"\"%s\" requires at most %d argument(s).\nSee '%s --help'.\n\nUsage:  %s\n\n%s",
 			cmd.CommandPath(),
 			max,
@@ -66,7 +66,7 @@ func RequiresRangeArgs(min int, max int) cobra.PositionalArgs {
 		if len(args) >= min && len(args) <= max {
 			return nil
 		}
-		return fmt.Errorf(
+		return errors.Errorf(
 			"\"%s\" requires at least %d and at most %d argument(s).\nSee '%s --help'.\n\nUsage:  %s\n\n%s",
 			cmd.CommandPath(),
 			min,
@@ -84,7 +84,7 @@ func ExactArgs(number int) cobra.PositionalArgs {
 		if len(args) == number {
 			return nil
 		}
-		return fmt.Errorf(
+		return errors.Errorf(
 			"\"%s\" requires exactly %d argument(s).\nSee '%s --help'.\n\nUsage:  %s\n\n%s",
 			cmd.CommandPath(),
 			number,

trust/trust.go

@@ -2,7 +2,6 @@ package trust
 
 import (
 	"encoding/json"
-	"fmt"
 	"net"
 	"net/http"
 	"net/url"
@@ -29,6 +28,7 @@ import (
 	"github.com/docker/notary/trustpinning"
 	"github.com/docker/notary/tuf/data"
 	"github.com/docker/notary/tuf/signed"
+	"github.com/pkg/errors"
 )
 
 var (
@@ -57,7 +57,7 @@ func Server(index *registrytypes.IndexInfo) (string, error) {
 	if s := os.Getenv("DOCKER_CONTENT_TRUST_SERVER"); s != "" {
 		urlObj, err := url.Parse(s)
 		if err != nil || urlObj.Scheme != "https" {
-			return "", fmt.Errorf("valid https URL required for trust server, got %s", s)
+			return "", errors.Errorf("valid https URL required for trust server, got %s", s)
 		}
 
 		return s, nil
@@ -205,27 +205,27 @@ func NotaryError(repoName string, err error) error {
 	switch err.(type) {
 	case *json.SyntaxError:
 		logrus.Debugf("Notary syntax error: %s", err)
-		return fmt.Errorf("Error: no trust data available for remote repository %s. Try running notary server and setting DOCKER_CONTENT_TRUST_SERVER to its HTTPS address?", repoName)
+		return errors.Errorf("Error: no trust data available for remote repository %s. Try running notary server and setting DOCKER_CONTENT_TRUST_SERVER to its HTTPS address?", repoName)
 	case signed.ErrExpired:
-		return fmt.Errorf("Error: remote repository %s out-of-date: %v", repoName, err)
+		return errors.Errorf("Error: remote repository %s out-of-date: %v", repoName, err)
 	case trustmanager.ErrKeyNotFound:
-		return fmt.Errorf("Error: signing keys for remote repository %s not found: %v", repoName, err)
+		return errors.Errorf("Error: signing keys for remote repository %s not found: %v", repoName, err)
 	case storage.NetworkError:
-		return fmt.Errorf("Error: error contacting notary server: %v", err)
+		return errors.Errorf("Error: error contacting notary server: %v", err)
 	case storage.ErrMetaNotFound:
-		return fmt.Errorf("Error: trust data missing for remote repository %s or remote repository not found: %v", repoName, err)
+		return errors.Errorf("Error: trust data missing for remote repository %s or remote repository not found: %v", repoName, err)
 	case trustpinning.ErrRootRotationFail, trustpinning.ErrValidationFail, signed.ErrInvalidKeyType:
-		return fmt.Errorf("Warning: potential malicious behavior - trust data mismatch for remote repository %s: %v", repoName, err)
+		return errors.Errorf("Warning: potential malicious behavior - trust data mismatch for remote repository %s: %v", repoName, err)
 	case signed.ErrNoKeys:
-		return fmt.Errorf("Error: could not find signing keys for remote repository %s, or could not decrypt signing key: %v", repoName, err)
+		return errors.Errorf("Error: could not find signing keys for remote repository %s, or could not decrypt signing key: %v", repoName, err)
 	case signed.ErrLowVersion:
-		return fmt.Errorf("Warning: potential malicious behavior - trust data version is lower than expected for remote repository %s: %v", repoName, err)
+		return errors.Errorf("Warning: potential malicious behavior - trust data version is lower than expected for remote repository %s: %v", repoName, err)
 	case signed.ErrRoleThreshold:
-		return fmt.Errorf("Warning: potential malicious behavior - trust data has insufficient signatures for remote repository %s: %v", repoName, err)
+		return errors.Errorf("Warning: potential malicious behavior - trust data has insufficient signatures for remote repository %s: %v", repoName, err)
 	case client.ErrRepositoryNotExist:
-		return fmt.Errorf("Error: remote trust data does not exist for %s: %v", repoName, err)
+		return errors.Errorf("Error: remote trust data does not exist for %s: %v", repoName, err)
 	case signed.ErrInsufficientSignatures:
-		return fmt.Errorf("Error: could not produce valid signature for %s.  If Yubikey was used, was touch input provided?: %v", repoName, err)
+		return errors.Errorf("Error: could not produce valid signature for %s.  If Yubikey was used, was touch input provided?: %v", repoName, err)
 	}
 
 	return err