Merge pull request drone-plugins#160 from appleboy/defalut

keep only master branch for latest

cmd/drone-docker/main.go

@@ -192,6 +192,11 @@ func main() {
 			Usage:  "docker email",
 			EnvVar: "PLUGIN_EMAIL,DOCKER_EMAIL",
 		},
+		cli.StringFlag{
+			Name:   "repo.branch",
+			Usage:  "repository default branch",
+			EnvVar: "DRONE_REPO_BRANCH",
+		},
 	}
 
 	if err := app.Run(os.Args); err != nil {
@@ -240,10 +245,19 @@ func run(c *cli.Context) error {
 	}
 
 	if c.Bool("tags.auto") {
-		plugin.Build.Tags = docker.DefaultTagSuffix(
+		if docker.UseDefaultTag( // return true if tag event or default branch
 			c.String("commit.ref"),
-			c.String("tags.suffix"),
-		)
+			c.String("repo.branch"),
+		) {
+			plugin.Build.Tags = docker.DefaultTagSuffix(
+				c.String("commit.ref"),
+				c.String("tags.suffix"),
+			)
+		} else {
+			logrus.Printf("skipping automated docker build for %s", c.String("commit.ref"))
+
+			return nil
+		}
 	}
 
 	return plugin.Exec()

docker.go

@@ -60,6 +60,24 @@ type (
 	}
 )
 
+func stripHeadPrefix(ref string) string {
+	ref = strings.TrimPrefix(ref, "refs/heads/")
+	return ref
+}
+
+// UseDefaultTag for keep only default branch for latest tag
+func UseDefaultTag(ref, defaultBranch string) bool {
+	if strings.HasPrefix(ref, "refs/tags/") {
+		return true
+	}
+
+	if stripHeadPrefix(ref) == defaultBranch {
+		return true
+	}
+
+	return false
+}
+
 // Exec executes the plugin step
 func (p Plugin) Exec() error {
 	// start the Docker daemon server

docker_test.go

@@ -0,0 +1,67 @@
+package docker
+
+import "testing"
+
+func Test_stripHeadPrefix(t *testing.T) {
+	type args struct {
+		ref string
+	}
+	tests := []struct {
+		args args
+		want string
+	}{
+		{
+			args: args{
+				ref: "refs/heads/master",
+			},
+			want: "master",
+		},
+	}
+	for _, tt := range tests {
+		if got := stripHeadPrefix(tt.args.ref); got != tt.want {
+			t.Errorf("stripHeadPrefix() = %v, want %v", got, tt.want)
+		}
+	}
+}
+
+func TestUseDefaultTag(t *testing.T) {
+	type args struct {
+		ref           string
+		defaultBranch string
+	}
+	tests := []struct {
+		name string
+		args args
+		want bool
+	}{
+		{
+			name: "latest tag for default branch",
+			args: args{
+				ref:           "refs/heads/master",
+				defaultBranch: "master",
+			},
+			want: true,
+		},
+		{
+			name: "build from tags",
+			args: args{
+				ref:           "refs/tags/v1.0.0",
+				defaultBranch: "master",
+			},
+			want: true,
+		},
+		{
+			name: "skip build for not default branch",
+			args: args{
+				ref:           "refs/heads/develop",
+				defaultBranch: "master",
+			},
+			want: false,
+		},
+	}
+	for _, tt := range tests {
+		if got := UseDefaultTag(tt.args.ref, tt.args.defaultBranch); got != tt.want {
+			t.Errorf("%q. UseDefaultTag() = %v, want %v", tt.name, got, tt.want)
+		}
+	}
+}