Display proper version information

- The cli version defaults to "unknown-version" unless set via the VERSION env var
- The commit version can be overridden via GITCOMMIT env var
- The build time can be overridden via BUILDTIME env var

Signed-off-by: Kenfe-Mickael Laventure <mickael.laventure@gmail.com>

Makefile

@@ -6,7 +6,7 @@
 
 # build the CLI
 build: clean
-	@go build -o ./build/docker github.com/docker/cli/cmd/docker
+	@./scripts/build/binary
 
 # remove build artifacts
 clean:
@@ -23,9 +23,7 @@ lint:
 
 # build the CLI for multiple architectures
 cross: clean
-	@gox -output build/docker-{{.OS}}-{{.Arch}} \
-		 -osarch="linux/arm linux/amd64 darwin/amd64 windows/amd64" \
-		 github.com/docker/cli/cmd/docker
+	@./scripts/build/cross
 
 vendor: vendor.conf
 	@vndr 2> /dev/null

cli/command/cli.go

@@ -7,6 +7,7 @@ import (
 	"os"
 	"runtime"
 
+	"github.com/docker/cli/cli"
 	cliconfig "github.com/docker/cli/cli/config"
 	"github.com/docker/cli/cli/config/configfile"
 	"github.com/docker/cli/cli/config/credentials"
@@ -15,7 +16,6 @@ import (
 	"github.com/docker/docker/api/types"
 	"github.com/docker/docker/api/types/versions"
 	"github.com/docker/docker/client"
-	"github.com/docker/docker/dockerversion"
 	dopts "github.com/docker/docker/opts"
 	"github.com/docker/go-connections/sockets"
 	"github.com/docker/go-connections/tlsconfig"
@@ -300,5 +300,5 @@ func newHTTPClient(host string, tlsOptions *tlsconfig.Options) (*http.Client, er
 
 // UserAgent returns the user agent string used for making API requests
 func UserAgent() string {
-	return "Docker-Client/" + dockerversion.Version + " (" + runtime.GOOS + ")"
+	return "Docker-Client/" + cli.Version + " (" + runtime.GOOS + ")"
 }

cli/command/system/version.go

@@ -9,7 +9,6 @@ import (
 	"github.com/docker/cli/cli"
 	"github.com/docker/cli/cli/command"
 	"github.com/docker/docker/api/types"
-	"github.com/docker/docker/dockerversion"
 	"github.com/docker/docker/pkg/templates"
 	"github.com/spf13/cobra"
 )
@@ -94,12 +93,12 @@ func runVersion(dockerCli *command.DockerCli, opts *versionOptions) error {
 
 	vd := versionInfo{
 		Client: clientVersion{
-			Version:           dockerversion.Version,
+			Version:           cli.Version,
 			APIVersion:        dockerCli.Client().ClientVersion(),
 			DefaultAPIVersion: dockerCli.DefaultVersion(),
 			GoVersion:         runtime.Version(),
-			GitCommit:         dockerversion.GitCommit,
-			BuildTime:         dockerversion.BuildTime,
+			GitCommit:         cli.GitCommit,
+			BuildTime:         cli.BuildTime,
 			Os:                runtime.GOOS,
 			Arch:              runtime.GOARCH,
 		},

cli/version.go

@@ -0,0 +1,9 @@
+package cli
+
+// Default build-time variable.
+// These values are overriding via ldflags
+var (
+	Version   = "unknown-version"
+	GitCommit = "unknown-commit"
+	BuildTime = "unknown-buildtime"
+)

cmd/docker/docker.go

@@ -15,7 +15,6 @@ import (
 	cliflags "github.com/docker/cli/cli/flags"
 	"github.com/docker/docker/api/types/versions"
 	"github.com/docker/docker/client"
-	"github.com/docker/docker/dockerversion"
 	"github.com/docker/docker/pkg/term"
 	"github.com/spf13/cobra"
 	"github.com/spf13/pflag"
@@ -184,7 +183,7 @@ func main() {
 }
 
 func showVersion() {
-	fmt.Printf("Docker version %s, build %s\n", dockerversion.Version, dockerversion.GitCommit)
+	fmt.Printf("Docker version %s, build %s\n", cli.Version, cli.GitCommit)
 }
 
 func dockerPreRun(opts *cliflags.ClientOptions) {

scripts/build/binary

@@ -0,0 +1,5 @@
+#!/usr/bin/env sh
+
+source ./scripts/build/ldflags
+
+go build -o ./build/docker --ldflags "${LDFLAGS}" github.com/docker/cli/cmd/docker

scripts/build/cross

@@ -0,0 +1,8 @@
+#!/usr/bin/env sh
+
+source ./scripts/build/ldflags
+
+gox -output build/docker-{{.OS}}-{{.Arch}} \
+    -osarch="linux/arm linux/amd64 darwin/amd64 windows/amd64" \
+	--ldflags "${LDFLAGS}" \
+	github.com/docker/cli/cmd/docker

scripts/build/ldflags

@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+
+VERSION=${VERSION:-"unknown-version"}
+GITCOMMIT=${GITCOMMIT:-$(git rev-parse --short HEAD 2> /dev/null || true)}
+BUILDTIME=${BUILDTIME:-$(date --utc --rfc-3339 ns 2> /dev/null | sed -e 's/ /T/')}
+
+export LDFLAGS="-X github.com/docker/cli/cli.GitCommit=${GITCOMMIT} \
+		-X github.com/docker/cli/cli.BuildTime=${BUILDTIME} \
+		-X github.com/docker/cli/cli.Version=${VERSION} ${LDFLAGS}"

vendor/github.com/docker/docker/dockerversion/useragent.go

@@ -1,76 +0,0 @@
-package dockerversion
-
-import (
-	"fmt"
-	"runtime"
-
-	"github.com/docker/docker/pkg/parsers/kernel"
-	"github.com/docker/docker/pkg/useragent"
-	"golang.org/x/net/context"
-)
-
-// UAStringKey is used as key type for user-agent string in net/context struct
-const UAStringKey = "upstream-user-agent"
-
-// DockerUserAgent is the User-Agent the Docker client uses to identify itself.
-// In accordance with RFC 7231 (5.5.3) is of the form:
-//    [docker client's UA] UpstreamClient([upstream client's UA])
-func DockerUserAgent(ctx context.Context) string {
-	httpVersion := make([]useragent.VersionInfo, 0, 6)
-	httpVersion = append(httpVersion, useragent.VersionInfo{Name: "docker", Version: Version})
-	httpVersion = append(httpVersion, useragent.VersionInfo{Name: "go", Version: runtime.Version()})
-	httpVersion = append(httpVersion, useragent.VersionInfo{Name: "git-commit", Version: GitCommit})
-	if kernelVersion, err := kernel.GetKernelVersion(); err == nil {
-		httpVersion = append(httpVersion, useragent.VersionInfo{Name: "kernel", Version: kernelVersion.String()})
-	}
-	httpVersion = append(httpVersion, useragent.VersionInfo{Name: "os", Version: runtime.GOOS})
-	httpVersion = append(httpVersion, useragent.VersionInfo{Name: "arch", Version: runtime.GOARCH})
-
-	dockerUA := useragent.AppendVersions("", httpVersion...)
-	upstreamUA := getUserAgentFromContext(ctx)
-	if len(upstreamUA) > 0 {
-		ret := insertUpstreamUserAgent(upstreamUA, dockerUA)
-		return ret
-	}
-	return dockerUA
-}
-
-// getUserAgentFromContext returns the previously saved user-agent context stored in ctx, if one exists
-func getUserAgentFromContext(ctx context.Context) string {
-	var upstreamUA string
-	if ctx != nil {
-		var ki interface{} = ctx.Value(UAStringKey)
-		if ki != nil {
-			upstreamUA = ctx.Value(UAStringKey).(string)
-		}
-	}
-	return upstreamUA
-}
-
-// escapeStr returns s with every rune in charsToEscape escaped by a backslash
-func escapeStr(s string, charsToEscape string) string {
-	var ret string
-	for _, currRune := range s {
-		appended := false
-		for _, escapeableRune := range charsToEscape {
-			if currRune == escapeableRune {
-				ret += `\` + string(currRune)
-				appended = true
-				break
-			}
-		}
-		if !appended {
-			ret += string(currRune)
-		}
-	}
-	return ret
-}
-
-// insertUpstreamUserAgent adds the upstream client useragent to create a user-agent
-// string of the form:
-//   $dockerUA UpstreamClient($upstreamUA)
-func insertUpstreamUserAgent(upstreamUA string, dockerUA string) string {
-	charsToEscape := `();\`
-	upstreamUAEscaped := escapeStr(upstreamUA, charsToEscape)
-	return fmt.Sprintf("%s UpstreamClient(%s)", dockerUA, upstreamUAEscaped)
-}

vendor/github.com/docker/docker/dockerversion/version_lib.go

@@ -1,16 +0,0 @@
-// +build !autogen
-
-// Package dockerversion is auto-generated at build-time
-package dockerversion
-
-// Default build-time variable for library-import.
-// This file is overridden on build with build-time informations.
-const (
-	GitCommit          string = "library-import"
-	Version            string = "library-import"
-	BuildTime          string = "library-import"
-	IAmStatic          string = "library-import"
-	ContainerdCommitID string = "library-import"
-	RuncCommitID       string = "library-import"
-	InitCommitID       string = "library-import"
-)