bake: allow dot in target names for compose

This is a hotfix for v0.8 to unblock release and
restore backward compatibility. More proper fix
coming later.

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

bake/bake.go

@@ -29,7 +29,9 @@ var (
 	gitURLPathWithFragmentSuffix = regexp.MustCompile(`\.git(?:#.+)?$`)
 
 	validTargetNameChars        = `[a-zA-Z0-9_-]+`
+	validTargetNameCharsCompose = `[a-zA-Z0-9._-]+`
 	targetNamePattern           = regexp.MustCompile(`^` + validTargetNameChars + `$`)
+	targetNamePatternCompose    = regexp.MustCompile(`^` + validTargetNameCharsCompose + `$`)
 )
 
 type File struct {
@@ -968,6 +970,13 @@ func validateTargetName(name string) error {
 	return nil
 }
 
+func validateTargetNameCompose(name string) error {
+	if !targetNamePatternCompose.MatchString(name) {
+		return errors.Errorf("only %q are allowed", validTargetNameCharsCompose)
+	}
+	return nil
+}
+
 func sliceEqual(s1, s2 []string) bool {
 	if len(s1) != len(s2) {
 		return false

bake/compose.go

@@ -60,7 +60,7 @@ func ParseCompose(dt []byte) (*Config, error) {
 				continue
 			}
 
-			if err = validateTargetName(s.Name); err != nil {
+			if err = validateTargetNameCompose(s.Name); err != nil {
 				return nil, errors.Wrapf(err, "invalid service name %q", s.Name)
 			}
 

bake/compose_test.go

@@ -330,6 +330,10 @@ func TestServiceName(t *testing.T) {
 		},
 		{
 			svc:     "a.b",
+			wantErr: false,
+		},
+		{
+			svc:     "a?b",
 			wantErr: true,
 		},
 		{