bake: allow pattern matching for target names in --set

README.md

@@ -507,11 +507,13 @@ Options:
 | Flag | Description |
 | --- | --- |
 |  -f, --file stringArray  | Build definition file
+|      --load              | Shorthand for --set=*.output=type=docker
 |      --no-cache          | Do not use cache when building the image
 |      --print             | Print the options without building
 |      --progress string   | Set type of progress output (auto, plain, tty). Use plain to show container output (default "auto")
 |      --pull              | Always attempt to pull a newer version of the image
-|      --set stringArray   | Override target value (eg: target.key=value)
+|      --push              | Shorthand for --set=*.output=type=registry
+|      --set stringArray   | Override target value (eg: targetpattern.key=value)
 
 #### `-f, --file FILE`
 
@@ -554,14 +556,16 @@ Same as `build --progress`. Set type of progress output (auto, plain, tty). Use
 
 Same as `build --pull`.
 
-#### `--set target.key[.subkey]=value`
+#### `--set targetpattern.key[.subkey]=value`
 
-Override target configurations from command line.
+Override target configurations from command line. The pattern matching syntax is defined in https://golang.org/pkg/path/#Match.
 
 Example:
 ```
 docker buildx bake --set target.args.mybuildarg=value
 docker buildx bake --set target.platform=linux/arm64
+docker buildx bake --set foo*.args.mybuildarg=value	# overrides build arg for all targets starting with 'foo'
+docker buildx bake --set *.platform=linux/arm64		# overrides platform for all targets
 ```
 
 #### File definition

bake/bake.go

@@ -106,6 +106,26 @@ func mergeConfig(c1, c2 Config) Config {
 	return c1
 }
 
+func (c Config) expandTargets(pattern string) ([]string, error) {
+	if _, ok := c.Target[pattern]; ok {
+		return []string{pattern}, nil
+	}
+	var names []string
+	for name := range c.Target {
+		ok, err := path.Match(pattern, name)
+		if err != nil {
+			return nil, errors.Wrapf(err, "could not match targets with '%s'", pattern)
+		}
+		if ok {
+			names = append(names, name)
+		}
+	}
+	if len(names) == 0 {
+		return nil, errors.Errorf("could not find any target matching '%s'", pattern)
+	}
+	return names, nil
+}
+
 func (c Config) newOverrides(v []string) (map[string]Target, error) {
 	m := map[string]Target{}
 	for _, v := range v {
@@ -116,65 +136,69 @@ func (c Config) newOverrides(v []string) (map[string]Target, error) {
 			return nil, errors.Errorf("invalid override key %s, expected target.name", parts[0])
 		}
 
-		name := keys[0]
+		pattern := keys[0]
 		if len(parts) != 2 && keys[1] != "args" {
 			return nil, errors.Errorf("invalid override %s, expected target.name=value", v)
 		}
 
-		t := m[name]
-		if _, ok := c.Target[name]; !ok {
-			return nil, errors.Errorf("unknown target %s", name)
+		names, err := c.expandTargets(pattern)
+		if err != nil {
+			return nil, err
 		}
 
-		switch keys[1] {
-		case "context":
-			t.Context = &parts[1]
-		case "dockerfile":
-			t.Dockerfile = &parts[1]
-		case "args":
-			if len(keys) != 3 {
-				return nil, errors.Errorf("invalid key %s, args requires name", parts[0])
-			}
-			if t.Args == nil {
-				t.Args = map[string]string{}
-			}
-			if len(parts) < 2 {
-				v, ok := os.LookupEnv(keys[2])
-				if ok {
-					t.Args[keys[2]] = v
+		for _, name := range names {
+			t := m[name]
+
+			switch keys[1] {
+			case "context":
+				t.Context = &parts[1]
+			case "dockerfile":
+				t.Dockerfile = &parts[1]
+			case "args":
+				if len(keys) != 3 {
+					return nil, errors.Errorf("invalid key %s, args requires name", parts[0])
 				}
-			} else {
-				t.Args[keys[2]] = parts[1]
-			}
-		case "labels":
-			if len(keys) != 3 {
-				return nil, errors.Errorf("invalid key %s, lanels requires name", parts[0])
-			}
-			if t.Labels == nil {
-				t.Labels = map[string]string{}
+				if t.Args == nil {
+					t.Args = map[string]string{}
+				}
+				if len(parts) < 2 {
+					v, ok := os.LookupEnv(keys[2])
+					if ok {
+						t.Args[keys[2]] = v
+					}
+				} else {
+					t.Args[keys[2]] = parts[1]
+				}
+			case "labels":
+				if len(keys) != 3 {
+					return nil, errors.Errorf("invalid key %s, lanels requires name", parts[0])
+				}
+				if t.Labels == nil {
+					t.Labels = map[string]string{}
+				}
+				t.Labels[keys[2]] = parts[1]
+			case "tags":
+				t.Tags = append(t.Tags, parts[1])
+			case "cache-from":
+				t.CacheFrom = append(t.CacheFrom, parts[1])
+			case "cache-to":
+				t.CacheTo = append(t.CacheTo, parts[1])
+			case "target":
+				s := parts[1]
+				t.Target = &s
+			case "secrets":
+				t.Secrets = append(t.Secrets, parts[1])
+			case "ssh":
+				t.SSH = append(t.SSH, parts[1])
+			case "platform":
+				t.Platforms = append(t.Platforms, parts[1])
+			case "output":
+				t.Outputs = append(t.Outputs, parts[1])
+			default:
+				return nil, errors.Errorf("unknown key: %s", keys[1])
 			}
-			t.Labels[keys[2]] = parts[1]
-		case "tags":
-			t.Tags = append(t.Tags, parts[1])
-		case "cache-from":
-			t.CacheFrom = append(t.CacheFrom, parts[1])
-		case "cache-to":
-			t.CacheTo = append(t.CacheTo, parts[1])
-		case "target":
-			s := parts[1]
-			t.Target = &s
-		case "secrets":
-			t.Secrets = append(t.Secrets, parts[1])
-		case "ssh":
-			t.SSH = append(t.SSH, parts[1])
-		case "platform":
-			t.Platforms = append(t.Platforms, parts[1])
-		case "output":
-			t.Outputs = append(t.Outputs, parts[1])
-		default:
-			return nil, errors.Errorf("unknown key: %s", keys[1])
+			m[name] = t
 		}
-		m[name] = t
 	}
 	return m, nil
 }

bake/bake_test.go

@@ -18,10 +18,10 @@ func TestReadTargets(t *testing.T) {
 
 	fp := filepath.Join(tmpdir, "config.hcl")
 	err = ioutil.WriteFile(fp, []byte(`
-target "dep" {
+target "webDEP" {
 	args {
-		VAR_INHERITED = "dep"
-		VAR_BOTH = "dep"
+		VAR_INHERITED = "webDEP"
+		VAR_BOTH = "webDEP"
 	}
 }
 
@@ -30,7 +30,7 @@ target "webapp" {
 	args {
 		VAR_BOTH = "webapp"
 	}
-	inherits = ["dep"]
+	inherits = ["webDEP"]
 }`), 0600)
 	require.NoError(t, err)
 
@@ -43,13 +43,13 @@ target "webapp" {
 
 		require.Equal(t, "Dockerfile.webapp", *m["webapp"].Dockerfile)
 		require.Equal(t, ".", *m["webapp"].Context)
-		require.Equal(t, "dep", m["webapp"].Args["VAR_INHERITED"])
+		require.Equal(t, "webDEP", m["webapp"].Args["VAR_INHERITED"])
 	})
 
 	t.Run("InvalidTargetOverrides", func(t *testing.T) {
 		_, err := ReadTargets(ctx, []string{fp}, []string{"webapp"}, []string{"nosuchtarget.context=foo"})
 		require.NotNil(t, err)
-		require.Equal(t, err.Error(), "unknown target nosuchtarget")
+		require.Equal(t, err.Error(), "could not find any target matching 'nosuchtarget'")
 	})
 
 	t.Run("ArgsOverrides", func(t *testing.T) {
@@ -87,8 +87,8 @@ target "webapp" {
 		// building leaf but overriding parent fields
 		t.Run("parent", func(t *testing.T) {
 			m, err := ReadTargets(ctx, []string{fp}, []string{"webapp"}, []string{
-				"dep.args.VAR_INHERITED=override",
-				"dep.args.VAR_BOTH=override",
+				"webDEP.args.VAR_INHERITED=override",
+				"webDEP.args.VAR_BOTH=override",
 			})
 			require.NoError(t, err)
 			require.Equal(t, m["webapp"].Args["VAR_INHERITED"], "override")
@@ -106,6 +106,66 @@ target "webapp" {
 		require.Equal(t, "foo", *m["webapp"].Context)
 	})
 
+	t.Run("PatternOverride", func(t *testing.T) {
+		// same check for two cases
+		multiTargetCheck := func(t *testing.T, m map[string]Target, err error) {
+			require.NoError(t, err)
+			require.Equal(t, 2, len(m))
+			require.Equal(t, "foo", *m["webapp"].Dockerfile)
+			require.Equal(t, "webDEP", m["webapp"].Args["VAR_INHERITED"])
+			require.Equal(t, "foo", *m["webDEP"].Dockerfile)
+			require.Equal(t, "webDEP", m["webDEP"].Args["VAR_INHERITED"])
+		}
+
+		cases := []struct {
+			name      string
+			targets   []string
+			overrides []string
+			check     func(*testing.T, map[string]Target, error)
+		}{
+			{
+				name:      "multi target single pattern",
+				targets:   []string{"webapp", "webDEP"},
+				overrides: []string{"web*.dockerfile=foo"},
+				check:     multiTargetCheck,
+			},
+			{
+				name:      "multi target multi pattern",
+				targets:   []string{"webapp", "webDEP"},
+				overrides: []string{"web*.dockerfile=foo", "*.args.VAR_BOTH=bar"},
+				check:     multiTargetCheck,
+			},
+			{
+				name:      "single target",
+				targets:   []string{"webapp"},
+				overrides: []string{"web*.dockerfile=foo"},
+				check: func(t *testing.T, m map[string]Target, err error) {
+					require.NoError(t, err)
+					require.Equal(t, 1, len(m))
+					require.Equal(t, "foo", *m["webapp"].Dockerfile)
+					require.Equal(t, "webDEP", m["webapp"].Args["VAR_INHERITED"])
+				},
+			},
+			{
+				name:      "nomatch",
+				targets:   []string{"webapp"},
+				overrides: []string{"nomatch*.dockerfile=foo"},
+				check: func(t *testing.T, m map[string]Target, err error) {
+					// NOTE: I am unsure whether failing to match should always error out
+					// instead of simply skipping that override.
+					// Let's enforce the error and we can relax it later if users complain.
+					require.NotNil(t, err)
+					require.Equal(t, err.Error(), "could not find any target matching 'nomatch*'")
+				},
+			},
+		}
+		for _, test := range cases {
+			t.Run(test.name, func(t *testing.T) {
+				m, err := ReadTargets(ctx, []string{fp}, test.targets, test.overrides)
+				test.check(t, m, err)
+			})
+		}
+	})
 }
 
 func TestReadTargetsCompose(t *testing.T) {

commands/bake.go

@@ -37,7 +37,17 @@ func runBake(dockerCli command.Cli, targets []string, in bakeOptions) error {
 		targets = []string{"default"}
 	}
 
-	m, err := bake.ReadTargets(ctx, in.files, targets, in.overrides)
+	overrides := in.overrides
+	if in.exportPush {
+		if in.exportLoad {
+			return errors.Errorf("push and load may not be set together at the moment")
+		}
+		overrides = append(overrides, "*.output=type=registry")
+	} else if in.exportLoad {
+		overrides = append(overrides, "*.output=type=docker")
+	}
+
+	m, err := bake.ReadTargets(ctx, in.files, targets, overrides)
 	if err != nil {
 		return err
 	}
@@ -99,7 +109,9 @@ func bakeCmd(dockerCli command.Cli) *cobra.Command {
 
 	flags.StringArrayVarP(&options.files, "file", "f", []string{}, "Build definition file")
 	flags.BoolVar(&options.printOnly, "print", false, "Print the options without building")
-	flags.StringArrayVar(&options.overrides, "set", nil, "Override target value (eg: target.key=value)")
+	flags.StringArrayVar(&options.overrides, "set", nil, "Override target value (eg: targetpattern.key=value)")
+	flags.BoolVar(&options.exportPush, "push", false, "Shorthand for --set=*.output=type=registry")
+	flags.BoolVar(&options.exportLoad, "load", false, "Shorthand for --set=*.output=type=docker")
 
 	commonFlags(&options.commonOptions, flags)
 

commands/build.go

@@ -38,9 +38,6 @@ type buildOptions struct {
 	extraHosts  []string
 	networkMode string
 
-	exportPush bool
-	exportLoad bool
-
 	// unimplemented
 	squash bool
 	quiet  bool
@@ -65,9 +62,11 @@ type buildOptions struct {
 }
 
 type commonOptions struct {
-	noCache  bool
-	progress string
-	pull     bool
+	noCache    bool
+	progress   string
+	pull       bool
+	exportPush bool
+	exportLoad bool
 }
 
 func runBuild(dockerCli command.Cli, in buildOptions) error {