Add --registry-authfile to specify a specific auth file for the registry push

Author: creydr

cmd/build.go

@@ -13,6 +13,7 @@ import (
 	pack "knative.dev/func/pkg/builders/buildpacks"
 	"knative.dev/func/pkg/builders/s2i"
 	"knative.dev/func/pkg/config"
+	"knative.dev/func/pkg/docker"
 	fn "knative.dev/func/pkg/functions"
 	"knative.dev/func/pkg/oci"
 )
@@ -29,7 +30,7 @@ SYNOPSIS
 	{{rootCmdUse}} build [-r|--registry] [--builder] [--builder-image]
 		         [--push] [--username] [--password] [--token]
 	             [--platform] [-p|--path] [-c|--confirm] [-v|--verbose]
-		         [--build-timestamp] [--registry-insecure]
+		         [--build-timestamp] [--registry-insecure] [--registry-authfile]
 
 DESCRIPTION
 
@@ -69,7 +70,7 @@ EXAMPLES
 		SuggestFor: []string{"biuld", "buidl", "built"},
 		PreRunE: bindEnv("image", "path", "builder", "registry", "confirm",
 			"push", "builder-image", "base-image", "platform", "verbose",
-			"build-timestamp", "registry-insecure", "username", "password", "token"),
+			"build-timestamp", "registry-insecure", "registry-authfile", "username", "password", "token"),
 		RunE: func(cmd *cobra.Command, args []string) error {
 			return runBuild(cmd, args, newClient)
 		},
@@ -102,6 +103,7 @@ EXAMPLES
 	cmd.Flags().StringP("registry", "r", cfg.Registry,
 		"Container registry + registry namespace. (ex 'ghcr.io/myuser').  The full image name is automatically determined using this along with function name. ($FUNC_REGISTRY)")
 	cmd.Flags().Bool("registry-insecure", cfg.RegistryInsecure, "Skip TLS certificate verification when communicating in HTTPS with the registry ($FUNC_REGISTRY_INSECURE)")
+	cmd.Flags().String("registry-authfile", "", "Path to a authentication file containing registry credentials ($FUNC_REGISTRY_AUTHFILE)")
 
 	// Function-Context Flags:
 	// Options whose value is available on the function with context only
@@ -293,6 +295,9 @@ type buildConfig struct {
 	// Build with the current timestamp as the created time for docker image.
 	// This is only useful for buildpacks builder.
 	WithTimestamp bool
+
+	// RegistryAuthfile is the path to a docker-config file containing registry credentials.
+	RegistryAuthfile string
 }
 
 // newBuildConfig gathers options into a single build request.
@@ -305,16 +310,17 @@ func newBuildConfig() buildConfig {
 			Verbose:          viper.GetBool("verbose"),
 			RegistryInsecure: viper.GetBool("registry-insecure"),
 		},
-		BuilderImage:  viper.GetString("builder-image"),
-		BaseImage:     viper.GetString("base-image"),
-		Image:         viper.GetString("image"),
-		Path:          viper.GetString("path"),
-		Platform:      viper.GetString("platform"),
-		Push:          viper.GetBool("push"),
-		Username:      viper.GetString("username"),
-		Password:      viper.GetString("password"),
-		Token:         viper.GetString("token"),
-		WithTimestamp: viper.GetBool("build-timestamp"),
+		BuilderImage:     viper.GetString("builder-image"),
+		BaseImage:        viper.GetString("base-image"),
+		Image:            viper.GetString("image"),
+		Path:             viper.GetString("path"),
+		Platform:         viper.GetString("platform"),
+		Push:             viper.GetBool("push"),
+		Username:         viper.GetString("username"),
+		Password:         viper.GetString("password"),
+		Token:            viper.GetString("token"),
+		WithTimestamp:    viper.GetBool("build-timestamp"),
+		RegistryAuthfile: viper.GetString("registry-authfile"),
 	}
 }
 
@@ -479,10 +485,12 @@ func (c buildConfig) Validate(cmd *cobra.Command) (err error) {
 // deployment is not the contiainer, but rather the running service.
 func (c buildConfig) clientOptions() ([]fn.Option, error) {
 	o := []fn.Option{fn.WithRegistry(c.Registry)}
+
+	t := newTransport(c.RegistryInsecure)
+	creds := newCredentialsProvider(config.Dir(), t, c.RegistryAuthfile)
+
 	switch c.Builder {
 	case builders.Host:
-		t := newTransport(c.RegistryInsecure) // may provide a custom impl which proxies
-		creds := newCredentialsProvider(config.Dir(), t)
 		o = append(o,
 			fn.WithBuilder(oci.NewBuilder(builders.Host, c.Verbose)),
 			fn.WithPusher(oci.NewPusher(c.RegistryInsecure, false, c.Verbose,
@@ -495,12 +503,20 @@ func (c buildConfig) clientOptions() ([]fn.Option, error) {
 			fn.WithBuilder(pack.NewBuilder(
 				pack.WithName(builders.Pack),
 				pack.WithTimestamp(c.WithTimestamp),
-				pack.WithVerbose(c.Verbose))))
+				pack.WithVerbose(c.Verbose))),
+			fn.WithPusher(docker.NewPusher(
+				docker.WithCredentialsProvider(creds),
+				docker.WithTransport(t),
+				docker.WithVerbose(c.Verbose))))
 	case builders.S2I:
 		o = append(o,
 			fn.WithBuilder(s2i.NewBuilder(
 				s2i.WithName(builders.S2I),
-				s2i.WithVerbose(c.Verbose))))
+				s2i.WithVerbose(c.Verbose))),
+			fn.WithPusher(docker.NewPusher(
+				docker.WithCredentialsProvider(creds),
+				docker.WithTransport(t),
+				docker.WithVerbose(c.Verbose))))
 	default:
 		return o, builders.ErrUnknownBuilder{Name: c.Builder, Known: KnownBuilders()}
 	}

cmd/client.go

@@ -56,9 +56,9 @@ func NewTestClient(options ...fn.Option) ClientFactory {
 // 'Verbose' indicates the system should write out a higher amount of logging.
 func NewClient(cfg ClientConfig, options ...fn.Option) (*fn.Client, func()) {
 	var (
-		t  = newTransport(cfg.InsecureSkipVerify)    // may provide a custom impl which proxies
-		c  = newCredentialsProvider(config.Dir(), t) // for accessing registries
-		d  = newKnativeDeployer(cfg.Verbose)         // default deployer (can be overridden via options)
+		t  = newTransport(cfg.InsecureSkipVerify)        // may provide a custom impl which proxies
+		c  = newCredentialsProvider(config.Dir(), t, "") // for accessing registries
+		d  = newKnativeDeployer(cfg.Verbose)             // default deployer (can be overridden via options)
 		pp = newTektonPipelinesProvider(c, cfg.Verbose)
 		o  = []fn.Option{ // standard (shared) options for all commands
 			fn.WithVerbose(cfg.Verbose),
@@ -101,7 +101,8 @@ func newTransport(insecureSkipVerify bool) fnhttp.RoundTripCloser {
 // newCredentialsProvider returns a credentials provider which possibly
 // has cluster-flavor specific additional credential loaders to take advantage
 // of features or configuration nuances of cluster variants.
-func newCredentialsProvider(configPath string, t http.RoundTripper) oci.CredentialsProvider {
+// If authFilePath is provided (non-empty), it will be used as the primary auth file.
+func newCredentialsProvider(configPath string, t http.RoundTripper, authFilePath string) oci.CredentialsProvider {
 	additionalLoaders := append(k8s.GetOpenShiftDockerCredentialLoaders(), k8s.GetGoogleCredentialLoader()...)
 	additionalLoaders = append(additionalLoaders, k8s.GetECRCredentialLoader()...)
 	additionalLoaders = append(additionalLoaders, k8s.GetACRCredentialLoader()...)
@@ -112,6 +113,11 @@ func newCredentialsProvider(configPath string, t http.RoundTripper) oci.Credenti
 		creds.WithAdditionalCredentialLoaders(additionalLoaders...),
 	}
 
+	// If a custom auth file path is provided, use it
+	if authFilePath != "" {
+		options = append(options, creds.WithAuthFilePath(authFilePath))
+	}
+
 	// Other cluster variants can be supported here
 	return creds.NewCredentialsProvider(configPath, options...)
 }

docs/reference/func_build.md

@@ -12,7 +12,7 @@ SYNOPSIS
 	func build [-r|--registry] [--builder] [--builder-image]
 		         [--push] [--username] [--password] [--token]
 	             [--platform] [-p|--path] [-c|--confirm] [-v|--verbose]
-		         [--build-timestamp] [--registry-insecure]
+		         [--build-timestamp] [--registry-insecure] [--registry-authfile]
 
 DESCRIPTION
 
@@ -57,19 +57,20 @@ func build
 ### Options
 
 ```
-      --base-image string      Override the base image for your function (host builder only)
-      --build-timestamp        Use the actual time as the created time for the docker image. This is only useful for buildpacks builder.
-  -b, --builder string         Builder to use when creating the function's container. Currently supported builders are "host", "pack" and "s2i". ($FUNC_BUILDER) (default "pack")
-      --builder-image string   Specify a custom builder image for use by the builder other than its default. ($FUNC_BUILDER_IMAGE)
-  -c, --confirm                Prompt to confirm options interactively ($FUNC_CONFIRM)
-  -h, --help                   help for build
-  -i, --image string           Full image name in the form [registry]/[namespace]/[name]:[tag] (optional). This option takes precedence over --registry ($FUNC_IMAGE)
-  -p, --path string            Path to the function.  Default is current directory ($FUNC_PATH)
-      --platform string        Optionally specify a target platform, for example "linux/amd64" when using the s2i build strategy
-  -u, --push                   Attempt to push the function image to the configured registry after being successfully built
-  -r, --registry string        Container registry + registry namespace. (ex 'ghcr.io/myuser').  The full image name is automatically determined using this along with function name. ($FUNC_REGISTRY)
-      --registry-insecure      Skip TLS certificate verification when communicating in HTTPS with the registry ($FUNC_REGISTRY_INSECURE)
-  -v, --verbose                Print verbose logs ($FUNC_VERBOSE)
+      --base-image string          Override the base image for your function (host builder only)
+      --build-timestamp            Use the actual time as the created time for the docker image. This is only useful for buildpacks builder.
+  -b, --builder string             Builder to use when creating the function's container. Currently supported builders are "host", "pack" and "s2i". ($FUNC_BUILDER) (default "pack")
+      --builder-image string       Specify a custom builder image for use by the builder other than its default. ($FUNC_BUILDER_IMAGE)
+  -c, --confirm                    Prompt to confirm options interactively ($FUNC_CONFIRM)
+  -h, --help                       help for build
+  -i, --image string               Full image name in the form [registry]/[namespace]/[name]:[tag] (optional). This option takes precedence over --registry ($FUNC_IMAGE)
+  -p, --path string                Path to the function.  Default is current directory ($FUNC_PATH)
+      --platform string            Optionally specify a target platform, for example "linux/amd64" when using the s2i build strategy
+  -u, --push                       Attempt to push the function image to the configured registry after being successfully built
+  -r, --registry string            Container registry + registry namespace. (ex 'ghcr.io/myuser').  The full image name is automatically determined using this along with function name. ($FUNC_REGISTRY)
+      --registry-authfile string   Path to a docker-config file containing registry credentials ($FUNC_REGISTRY_AUTHFILE)
+      --registry-insecure          Skip TLS certificate verification when communicating in HTTPS with the registry ($FUNC_REGISTRY_INSECURE)
+  -v, --verbose                    Print verbose logs ($FUNC_VERBOSE)
 ```
 
 ### SEE ALSO

pkg/creds/credentials.go

@@ -94,6 +94,14 @@ type credentialsProvider struct {
 
 type Opt func(opts *credentialsProvider)
 
+// WithAuthFilePath sets a custom path to a docker-config file containing registry credentials.
+// If not specified, the default path (configPath/auth.json) will be used.
+func WithAuthFilePath(path string) Opt {
+	return func(opts *credentialsProvider) {
+		opts.authFilePath = path
+	}
+}
+
 // WithPromptForCredentials sets custom callback that is supposed to
 // interactively ask for credentials in case the credentials cannot be found in configuration files.
 // The callback may be called multiple times in case incorrect credentials were returned before.
@@ -187,7 +195,10 @@ func NewCredentialsProvider(configPath string, opts ...Opt) oci.CredentialsProvi
 			return oci.Credentials{}, ErrCredentialsNotFound
 		})
 
-	c.authFilePath = filepath.Join(configPath, "auth.json")
+	// Set authFilePath if not already set by WithAuthFilePath option
+	if c.authFilePath == "" {
+		c.authFilePath = filepath.Join(configPath, "auth.json")
+	}
 	sys := &containersTypes.SystemContext{
 		AuthFilePath: c.authFilePath,
 	}

pkg/creds/credentials_test.go

@@ -815,6 +815,91 @@ func TestCredentialsHomePermissions(t *testing.T) {
 	}
 }
 
+func TestCredentialsFromAuthfile(t *testing.T) {
+	tests := []struct {
+		name              string
+		verifyCredentials creds.VerifyCredentialsCallback
+		authFileContent   string
+		image             string
+		want              Credentials
+	}{
+		{
+			name:              "Single registry auth file",
+			verifyCredentials: correctVerifyCbk,
+			authFileContent: fmt.Sprintf(`
+{
+	"auths": {
+		"docker.io": {
+			"auth": "%s"
+		}
+	}
+}
+`, base64.StdEncoding.EncodeToString([]byte(fmt.Sprintf("%s:%s", dockerIoUser, dockerIoUserPwd)))),
+			image: "docker.io/someorg/someimage:sometag",
+			want:  Credentials{Username: dockerIoUser, Password: dockerIoUserPwd},
+		},
+		{
+			name:              "Auth file with multiple registries",
+			verifyCredentials: correctVerifyCbk,
+			authFileContent: fmt.Sprintf(`
+{
+	"auths": {
+		"docker.io": {
+			"auth": "%s"
+		},
+		"quay.io": {
+			"auth": "%s"
+		}
+	}
+}
+`, base64.StdEncoding.EncodeToString([]byte(fmt.Sprintf("%s:%s", dockerIoUser, dockerIoUserPwd))),
+				base64.StdEncoding.EncodeToString([]byte(fmt.Sprintf("%s:%s", quayIoUser, quayIoUserPwd)))),
+			image: "quay.io/someorg/someimage:sometag",
+			want:  Credentials{Username: quayIoUser, Password: quayIoUserPwd},
+		},
+	}
+
+	// reset HOME to the original value after tests since they may change it
+	defer func() {
+		os.Setenv("HOME", homeTempDir)
+	}()
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			resetHomeDir(t)
+
+			authFile, err := os.CreateTemp("", "test-auth-*.txt")
+			if err != nil {
+				t.Fatalf("failed to create temp auth file: %s", err)
+			}
+			t.Cleanup(func() {
+				os.Remove(authFile.Name())
+			})
+			if _, err := authFile.Write([]byte(tt.authFileContent)); err != nil {
+				t.Fatalf("failed to write auth file: %s", err)
+			}
+			authFile.Close()
+
+			credentialsProvider := creds.NewCredentialsProvider(
+				testConfigPath(t),
+				creds.WithVerifyCredentials(tt.verifyCredentials),
+				creds.WithAuthFilePath(authFile.Name()),
+			)
+
+			got, err := credentialsProvider(context.Background(), tt.image)
+
+			// ASSERT
+			if err != nil {
+				t.Errorf("%v", err)
+				return
+			}
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("got: %v, want: %v", got, tt.want)
+			}
+		})
+	}
+}
+
 // ********************** helper functions below **************************** \\
 
 func resetHomeDir(t *testing.T) {