Add handling for GIT_CHECKOUT variable to skip checkout

common/build.go

@@ -463,6 +463,23 @@ func (b *Build) GetGitStrategy() GitStrategy {
 	}
 }
 
+func (b *Build) GetGitCheckout() bool {
+	if b.GetGitStrategy() == GitNone {
+		return false
+	}
+
+	strCheckout := b.GetAllVariables().Get("GIT_CHECKOUT")
+	if len(strCheckout) == 0 {
+		return true
+	}
+
+	checkout, err := strconv.ParseBool(strCheckout)
+	if err != nil {
+		return true
+	}
+	return checkout
+}
+
 func (b *Build) GetSubmoduleStrategy() SubmoduleStrategy {
 	if b.GetGitStrategy() == GitNone {
 		return SubmoduleNone

executors/shell/executor_shell_test.go

@@ -212,11 +212,36 @@ func TestBuildWithGitStrategyFetch(t *testing.T) {
 		out, err := runBuildReturningOutput(t, build)
 		assert.NoError(t, err)
 		assert.Contains(t, out, "Cloning repository")
+		assert.Regexp(t, "Checking out [a-f0-9]+ as", out)
 
 		out, err = runBuildReturningOutput(t, build)
 		assert.NoError(t, err)
 		assert.Contains(t, out, "Fetching changes")
+		assert.Regexp(t, "Checking out [a-f0-9]+ as", out)
+		assert.Contains(t, out, "pre-clone-script")
+	})
+}
+
+func TestBuildWithGitStrategyFetchNoCheckout(t *testing.T) {
+	onEachShell(t, func(t *testing.T, shell string) {
+		successfulBuild, err := common.GetSuccessfulBuild()
+		assert.NoError(t, err)
+		build, cleanup := newBuild(t, successfulBuild, shell)
+		defer cleanup()
 
+		build.Runner.PreCloneScript = "echo pre-clone-script"
+		build.Variables = append(build.Variables, common.JobVariable{Key: "GIT_STRATEGY", Value: "fetch"})
+		build.Variables = append(build.Variables, common.JobVariable{Key: "GIT_CHECKOUT", Value: "false"})
+
+		out, err := runBuildReturningOutput(t, build)
+		assert.NoError(t, err)
+		assert.Contains(t, out, "Cloning repository")
+		assert.Contains(t, out, "Skippping Git checkout")
+
+		out, err = runBuildReturningOutput(t, build)
+		assert.NoError(t, err)
+		assert.Contains(t, out, "Fetching changes")
+		assert.Contains(t, out, "Skippping Git checkout")
 		assert.Contains(t, out, "pre-clone-script")
 	})
 }
@@ -238,7 +263,30 @@ func TestBuildWithGitStrategyClone(t *testing.T) {
 		out, err = runBuildReturningOutput(t, build)
 		assert.NoError(t, err)
 		assert.Contains(t, out, "Cloning repository")
+		assert.Regexp(t, "Checking out [a-f0-9]+ as", out)
+		assert.Contains(t, out, "pre-clone-script")
+	})
+}
+
+func TestBuildWithGitStrategyCloneNoCheckout(t *testing.T) {
+	onEachShell(t, func(t *testing.T, shell string) {
+		successfulBuild, err := common.GetSuccessfulBuild()
+		assert.NoError(t, err)
+		build, cleanup := newBuild(t, successfulBuild, shell)
+		defer cleanup()
 
+		build.Runner.PreCloneScript = "echo pre-clone-script"
+		build.Variables = append(build.Variables, common.JobVariable{Key: "GIT_STRATEGY", Value: "clone"})
+		build.Variables = append(build.Variables, common.JobVariable{Key: "GIT_CHECKOUT", Value: "false"})
+
+		out, err := runBuildReturningOutput(t, build)
+		assert.NoError(t, err)
+		assert.Contains(t, out, "Cloning repository")
+
+		out, err = runBuildReturningOutput(t, build)
+		assert.NoError(t, err)
+		assert.Contains(t, out, "Cloning repository")
+		assert.Contains(t, out, "Skippping Git checkout")
 		assert.Contains(t, out, "pre-clone-script")
 	})
 }

shells/abstract.go

@@ -248,20 +248,21 @@ func (b *AbstractShell) writeCloneFetchCmds(w ShellWriter, info common.ShellScri
 	switch info.Build.GetGitStrategy() {
 	case common.GitFetch:
 		b.writeFetchCmd(w, build, projectDir, gitDir)
-		b.writeCheckoutCmd(w, build)
-
 	case common.GitClone:
 		b.writeCloneCmd(w, build, projectDir)
-		b.writeCheckoutCmd(w, build)
-
 	case common.GitNone:
 		w.Notice("Skipping Git repository setup")
 		w.MkDir(projectDir)
-
 	default:
 		return errors.New("unknown GIT_STRATEGY")
 	}
 
+	if info.Build.GetGitCheckout() {
+		b.writeCheckoutCmd(w, build)
+	} else {
+		w.Notice("Skippping Git checkout")
+	}
+
 	return nil
 }