feat: support TemplateField for build.artifacts.docker.cliFlags

pkg/skaffold/build/docker/docker.go

@@ -106,7 +106,7 @@ func (b *Builder) dockerCLIBuild(ctx context.Context, out io.Writer, name string
 	if err != nil {
 		return "", fmt.Errorf("unable to evaluate build args: %w", err)
 	}
-	cliArgs, err := docker.ToCLIBuildArgs(a, ba)
+	cliArgs, err := docker.ToCLIBuildArgs(a, ba, imageInfoEnv)
 	if err != nil {
 		return "", fmt.Errorf("getting docker build args: %w", err)
 	}

pkg/skaffold/build/docker/docker_test.go

@@ -45,6 +45,7 @@ func TestDockerCLIBuild(t *testing.T) {
 		cliFlags         []string // CLI flags to pass through to command.
 		cfg              mockConfig
 		extraEnv         []string
+		imageName        string
 		err              error
 		expectedEnv      []string
 		expectedCLIFlags []string // CLI flags expected to be autogenerated.
@@ -79,11 +80,20 @@ func TestDockerCLIBuild(t *testing.T) {
 			expectedEnv:      []string{"KEY=VALUE", "DOCKER_BUILDKIT=1"},
 		},
 		{
-			description:   "cliFlags",
-			cliFlags:      []string{"--platform", "linux/amd64"},
-			localBuild:    latest.LocalBuild{},
-			wantDockerCLI: true,
-			expectedEnv:   []string{"KEY=VALUE"},
+			description:      "cliFlags",
+			cliFlags:         []string{"--platform", "linux/amd64"},
+			localBuild:       latest.LocalBuild{},
+			wantDockerCLI:    true,
+			expectedCLIFlags: []string{"--platform", "linux/amd64"},
+			expectedEnv:      []string{"KEY=VALUE"},
+		},
+		{
+			description:      "cliFlags replace template",
+			imageName:        "docker.io/library/image:tag",
+			cliFlags:         []string{"--cache-to=type=registry,ref={{ .IMAGE_REPO }}/cache-image:cache"},
+			localBuild:       latest.LocalBuild{},
+			wantDockerCLI:    true,
+			expectedCLIFlags: []string{"--cache-to=type=registry,ref=docker.io/library/cache-image:cache"},
 		},
 		{
 			description:      "buildkit and extra env",
@@ -151,23 +161,26 @@ func TestDockerCLIBuild(t *testing.T) {
 			t.Override(&docker.DefaultAuthHelper, stubAuth{})
 			var mockCmd *testutil.FakeCmd
 
+			imageName := "tag"
+			if test.imageName != "" {
+				imageName = test.imageName
+			}
+
 			if test.err != nil {
 				var pruneFlag string
 				if test.cfg.Prune() {
 					pruneFlag = " --force-rm"
 				}
 				mockCmd = testutil.CmdRunErr(
-					"docker build . --file "+dockerfilePath+" -t tag"+pruneFlag,
+					"docker build . --file "+dockerfilePath+" -t "+imageName+pruneFlag,
 					test.err,
 				)
 				t.Override(&util.DefaultExecCommand, mockCmd)
 			}
 			if test.wantDockerCLI {
-				cmdLine := "docker build . --file " + dockerfilePath + " -t tag"
-				if len(test.cliFlags) > 0 || len(test.expectedCLIFlags) > 0 {
-					flags := append(test.cliFlags, test.expectedCLIFlags...)
-
-					cmdLine += " " + strings.Join(flags, " ")
+				cmdLine := "docker build . --file " + dockerfilePath + " -t " + imageName
+				if len(test.expectedCLIFlags) > 0 {
+					cmdLine += " " + strings.Join(test.expectedCLIFlags, " ")
 				}
 				mockCmd = testutil.CmdRunEnv(cmdLine, test.expectedEnv)
 				t.Override(&util.DefaultExecCommand, mockCmd)
@@ -186,7 +199,7 @@ func TestDockerCLIBuild(t *testing.T) {
 				},
 			}
 
-			_, err := builder.Build(context.Background(), io.Discard, artifact, "tag", platform.Matcher{})
+			_, err := builder.Build(context.Background(), io.Discard, artifact, imageName, platform.Matcher{})
 			t.CheckError(test.err != nil, err)
 			if mockCmd != nil {
 				t.CheckDeepEqual(1, mockCmd.TimesCalled())
@@ -283,6 +296,7 @@ type stubAuth struct{}
 func (t stubAuth) GetAuthConfig(context.Context, string) (registry.AuthConfig, error) {
 	return registry.AuthConfig{}, nil
 }
+
 func (t stubAuth) GetAllAuthConfigs(context.Context) (map[string]registry.AuthConfig, error) {
 	return nil, nil
 }

pkg/skaffold/build/gcb/docker.go

@@ -108,7 +108,7 @@ func (b *Builder) dockerBuildArgs(a *latest.Artifact, tag string, deps []*latest
 		return nil, fmt.Errorf("unable to evaluate build args: %w", err)
 	}
 
-	ba, err := docker.ToCLIBuildArgs(d, buildArgs)
+	ba, err := docker.ToCLIBuildArgs(d, buildArgs, nil)
 	if err != nil {
 		return nil, fmt.Errorf("getting docker build args: %w", err)
 	}

pkg/skaffold/docker/image.go

@@ -626,7 +626,7 @@ func (l *localDaemon) DiskUsage(ctx context.Context) (uint64, error) {
 	return uint64(usage.LayersSize), nil
 }
 
-func ToCLIBuildArgs(a *latest.DockerArtifact, evaluatedArgs map[string]*string) ([]string, error) {
+func ToCLIBuildArgs(a *latest.DockerArtifact, evaluatedArgs map[string]*string, env map[string]string) ([]string, error) {
 	var args []string
 	var keys []string
 	for k := range evaluatedArgs {
@@ -653,7 +653,13 @@ func ToCLIBuildArgs(a *latest.DockerArtifact, evaluatedArgs map[string]*string)
 		args = append(args, "--cache-from", from)
 	}
 
-	args = append(args, a.CliFlags...)
+	for _, cliFlag := range a.CliFlags {
+		cliFlag, err := util.ExpandEnvTemplate(cliFlag, env)
+		if err != nil {
+			return nil, fmt.Errorf("unable to evaluate cli flags: %w", err)
+		}
+		args = append(args, cliFlag)
+	}
 
 	if a.Target != "" {
 		args = append(args, "--target", a.Target)

pkg/skaffold/docker/image_test.go

@@ -318,6 +318,14 @@ func TestGetBuildArgs(t *testing.T) {
 			},
 			want: []string{"--foo", "--bar"},
 		},
+		{
+			description: "expand env for CLI flags",
+			artifact: &latest.DockerArtifact{
+				CliFlags: []string{"--cache-to=type=registry,ref={{ .IMAGE_REPO }}/cache-image:cache"},
+			},
+			env:  []string{"IMAGE_REPO=docker.io/library"},
+			want: []string{"--cache-to=type=registry,ref=docker.io/library/cache-image:cache"},
+		},
 		{
 			description: "target",
 			artifact: &latest.DockerArtifact{
@@ -430,7 +438,7 @@ func TestGetBuildArgs(t *testing.T) {
 				return
 			}
 
-			result, err := ToCLIBuildArgs(test.artifact, args)
+			result, err := ToCLIBuildArgs(test.artifact, args, nil)
 
 			t.CheckError(test.shouldErr, err)
 			if !test.shouldErr {