add GITHUB_BASE_REF as source for branch

Author: linkdata

pkg/gitsemver.go

@@ -133,11 +133,13 @@ func (vs *GitSemVer) GetTag(repo string) (string, bool) {
 }
 
 func (vs *GitSemVer) getBranchGitHub(repo string) (branchName string) {
-	if branchName = strings.TrimSpace(vs.Env.Getenv("GITHUB_REF_NAME")); branchName != "" {
-		if strings.TrimSpace(vs.Env.Getenv("GITHUB_REF_TYPE")) == "tag" {
-			for _, branchName = range vs.Git.GetBranchesFromTag(repo, branchName) {
-				if vs.IsReleaseBranch(branchName) {
-					break
+	if branchName = strings.TrimSpace(vs.Env.Getenv("GITHUB_BASE_REF")); branchName == "" {
+		if branchName = strings.TrimSpace(vs.Env.Getenv("GITHUB_REF_NAME")); branchName != "" {
+			if strings.TrimSpace(vs.Env.Getenv("GITHUB_REF_TYPE")) == "tag" {
+				for _, branchName = range vs.Git.GetBranchesFromTag(repo, branchName) {
+					if vs.IsReleaseBranch(branchName) {
+						break
+					}
 				}
 			}
 		}

pkg/gitsemver_test.go

@@ -142,6 +142,13 @@ func Test_VersionStringer_GetBranch(t *testing.T) {
 	delete(env, "GITHUB_REF_NAME")
 	git.branch = ""
 
+	git.branch = "detached"
+	env["GITHUB_BASE_REF"] = "main"
+	name = vs.GetBranch(".")
+	isEqual(t, "main", name)
+	delete(env, "GITHUB_BASE_REF")
+	git.branch = ""
+
 	git.branch = "detached"
 	env["CI_COMMIT_REF_NAME"] = "gitlab---branch"
 	name = vs.GetBranch(".")