cli/config: remove warning for deprecated ~/.dockercfg file

The `~/.dockercfg` file was replaced by `~/.docker/config.json` in 2015
(github.com/docker/docker/commit/18c9b6c6455f116ae59cde8544413b3d7d294a5e).

Commit b83bc67136 (v23.0.0, but backported to
v20.10) added a warning if no "current" config file was found but a legacy
file was, and if the CLI would fall back to using the deprecated file.

Commit ee218fa89e removed support for the
legacy file, but kept a warning in place if a legacy file was in place,
and now ignored.

This patch removes the warning as well, fully deprecating the legacy
`~/.dockercfg` file.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

cli/config/config.go

@@ -19,49 +19,22 @@ const (
 	// ConfigFileName is the name of config file
 	ConfigFileName = "config.json"
 	configFileDir  = ".docker"
-	oldConfigfile  = ".dockercfg" // Deprecated: remove once we stop printing deprecation warning
 	contextsDir    = "contexts"
 )
 
 var (
 	initConfigDir = new(sync.Once)
 	configDir     string
-	homeDir       string
 )
 
-// resetHomeDir is used in testing to reset the "homeDir" package variable to
-// force re-lookup of the home directory between tests.
-func resetHomeDir() {
-	homeDir = ""
-}
-
-func getHomeDir() string {
-	if homeDir == "" {
-		homeDir = homedir.Get()
-	}
-	return homeDir
-}
-
-// resetConfigDir is used in testing to reset the "configDir" package variable
-// and its sync.Once to force re-lookup between tests.
-func resetConfigDir() {
-	configDir = ""
-	initConfigDir = new(sync.Once)
-}
-
-func setConfigDir() {
-	if configDir != "" {
-		return
-	}
-	configDir = os.Getenv("DOCKER_CONFIG")
-	if configDir == "" {
-		configDir = filepath.Join(getHomeDir(), configFileDir)
-	}
-}
-
 // Dir returns the directory the configuration file is stored in
 func Dir() string {
-	initConfigDir.Do(setConfigDir)
+	initConfigDir.Do(func() {
+		configDir = os.Getenv("DOCKER_CONFIG")
+		if configDir == "" {
+			configDir = filepath.Join(homedir.Get(), configFileDir)
+		}
+	})
 	return configDir
 }
 
@@ -97,53 +70,42 @@ func LoadFromReader(configData io.Reader) (*configfile.ConfigFile, error) {
 // Load reads the configuration files in the given directory, and sets up
 // the auth config information and returns values.
 func Load(configDir string) (*configfile.ConfigFile, error) {
-	cfg, _, err := load(configDir)
-	return cfg, err
-}
-
-// TODO remove this temporary hack, which is used to warn about the deprecated ~/.dockercfg file
-// so we can remove the bool return value and collapse this back into `Load`
-func load(configDir string) (*configfile.ConfigFile, bool, error) {
-	printLegacyFileWarning := false
-
 	if configDir == "" {
 		configDir = Dir()
 	}
+	return load(configDir)
+}
 
+func load(configDir string) (*configfile.ConfigFile, error) {
 	filename := filepath.Join(configDir, ConfigFileName)
 	configFile := configfile.New(filename)
 
-	// Try happy path first - latest config file
+	file, err := os.Open(filename)
-	if file, err := os.Open(filename); err == nil {
+	if err != nil {
+		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, nil
+		}
+		// if file is there but we can't stat it for any reason other
+		// than it doesn't exist then stop
+		return configFile, nil
+	}
 	defer file.Close()
 	err = configFile.LoadFromReader(file)
 	if err != nil {
 		err = errors.Wrap(err, filename)
 	}
-		return configFile, printLegacyFileWarning, 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, printLegacyFileWarning, errors.Wrap(err, filename)
-	}
-
-	// Can't find latest config file so check for the old one
-	filename = filepath.Join(getHomeDir(), oldConfigfile)
-	if _, err := os.Stat(filename); err == nil {
-		printLegacyFileWarning = true
-	}
-	return configFile, printLegacyFileWarning, nil
 }
 
 // LoadDefaultConfigFile attempts to load the default config file and returns
 // an initialized ConfigFile struct if none is found.
 func LoadDefaultConfigFile(stderr io.Writer) *configfile.ConfigFile {
-	configFile, printLegacyFileWarning, err := load(Dir())
+	configFile, err := load(Dir())
 	if err != nil {
-		fmt.Fprintf(stderr, "WARNING: Error loading config file: %v\n", err)
+		_, _ = fmt.Fprintf(stderr, "WARNING: Error loading config file: %v\n", err)
-	}
-	if printLegacyFileWarning {
-		_, _ = fmt.Fprintln(stderr, "WARNING: Support for the legacy ~/.dockercfg configuration file and file-format has been removed and the configuration file will be ignored")
 	}
 	if !configFile.ContainsAuth() {
 		configFile.CredentialsStore = credentials.DetectDefaultStore(configFile.CredentialsStore)

cli/config/config_test.go

@@ -5,27 +5,15 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
-	"runtime"
 	"strings"
 	"testing"
 
 	"github.com/docker/cli/cli/config/configfile"
 	"github.com/docker/cli/cli/config/credentials"
-	"github.com/docker/cli/cli/config/types"
 	"gotest.tools/v3/assert"
 	is "gotest.tools/v3/assert/cmp"
-	"gotest.tools/v3/env"
-	"gotest.tools/v3/fs"
 )
 
-var homeKey = "HOME"
-
-func init() {
-	if runtime.GOOS == "windows" {
-		homeKey = "USERPROFILE"
-	}
-}
-
 func setupConfigDir(t *testing.T) string {
 	tmpdir := t.TempDir()
 	oldDir := Dir()
@@ -93,24 +81,6 @@ func TestEmptyJSON(t *testing.T) {
 	saveConfigAndValidateNewFormat(t, config, tmpHome)
 }
 
-func TestOldJSONFallbackDeprecationWarning(t *testing.T) {
-	js := `{"https://index.docker.io/v1/":{"auth":"am9lam9lOmhlbGxv","email":"user@example.com"}}`
-	tmpHome := fs.NewDir(t, t.Name(), fs.WithFile(oldConfigfile, js))
-	defer tmpHome.Remove()
-	env.PatchAll(t, map[string]string{homeKey: tmpHome.Path(), "DOCKER_CONFIG": ""})
-
-	// reset the homeDir, configDir, and its sync.Once, to force them being resolved again
-	resetHomeDir()
-	resetConfigDir()
-
-	buffer := new(bytes.Buffer)
-	configFile := LoadDefaultConfigFile(buffer)
-	expected := configfile.New(tmpHome.Join(configFileDir, ConfigFileName))
-	expected.AuthConfigs = map[string]types.AuthConfig{}
-	assert.Assert(t, strings.Contains(buffer.String(), "WARNING: Support for the legacy ~/.dockercfg configuration file and file-format has been removed and the configuration file will be ignored"))
-	assert.Check(t, is.DeepEqual(expected, configFile))
-}
-
 func TestNewJSON(t *testing.T) {
 	tmpHome := t.TempDir()
 

docs/deprecated.md

@@ -380,9 +380,6 @@ Given that the old file format encourages insecure storage of credentials
 Docker v1.7.0 has created this file, support for this file, and its format has
 been removed.
 
-A warning is printed in situations where the CLI would fall back to the old file,
-notifying the user that the legacy file is present, but ignored.
-
 ### Configuration options for experimental CLI features
 
 **Deprecated in Release: v19.03**