Fix git-init in case master is not the default branch

This fix will patch the `git-init` such that if user doesn't provides revision then instead of taking `master` as the default branch we are doing the `symbolic-link` to the HEAD branch.

Signed-off-by: vinamra28 <[email protected]>

pkg/apis/resource/v1alpha1/git/git_resource_test.go

@@ -675,6 +675,44 @@ func TestGitResource_GetDownloadTaskModifier(t *testing.T) {
  {Name: "NO_PROXY", Value: "no-proxy.git.com"},
  },
  },
+ }, {
+ desc: "Without Refspec and without revision",
+ gitResource: &git.Resource{
+ Name: "git-resource",
+ Type: resourcev1alpha1.PipelineResourceTypeGit,
+ URL: "[email protected]:test/test.git",
+ Revision: "",
+ Refspec: "",
+ GitImage: "override-with-git:latest",
+ Submodules: false,
+ Depth: 1,
+ SSLVerify: true,
+ HTTPProxy: "http-proxy.git.com",
+ HTTPSProxy: "https-proxy.git.com",
+ NOProxy: "no-proxy.git.com",
+ },
+ want: corev1.Container{
+ Name: "git-source-git-resource-twkr2",
+ Image: "override-with-git:latest",
+ Command: []string{"/ko-app/git-init"},
+ Args: []string{
+ "-url",
+ "[email protected]:test/test.git",
+ "-revision",
+ "",
+ "-path",
+ "/test/test",
+ "-submodules=false",
+ },
+ WorkingDir: "/workspace",
+ Env: []corev1.EnvVar{
+ {Name: "TEKTON_RESOURCE_NAME", Value: "git-resource"},
+ {Name: "HOME", Value: pipeline.HomeDir},
+ {Name: "HTTP_PROXY", Value: "http-proxy.git.com"},
+ {Name: "HTTPS_PROXY", Value: "https-proxy.git.com"},
+ {Name: "NO_PROXY", Value: "no-proxy.git.com"},
+ },
+ },
  }} {
  t.Run(tc.desc, func(t *testing.T) {
  ts := v1beta1.TaskSpec{}

pkg/git/git.go

@@ -65,7 +65,7 @@ func Fetch(logger *zap.SugaredLogger, spec FetchSpec) error {
  }
 
  if spec.Revision == "" {
- spec.Revision = "master"
+ spec.Revision = "HEAD"
  }
  if spec.Path != "" {
  if _, err := run(logger, "", "init", spec.Path); err != nil {
@@ -85,7 +85,13 @@ func Fetch(logger *zap.SugaredLogger, spec FetchSpec) error {
  logger.Warnf("Failed to set http.sslVerify in git config: %s", err)
  return err
  }
-
+ if spec.Revision == "" {
+ spec.Revision = "HEAD"
+ if _, err := run(logger, "", "symbolic-ref", spec.Revision, "refs/remotes/origin/HEAD"); err != nil {
+ return err
+ }
+ }
+
  fetchArgs := []string{"fetch"}
  if spec.Submodules {
  fetchArgs = append(fetchArgs, "--recurse-submodules=yes")