Use Github repo's default branch for up and github actions

src/containerapp/azext_containerapp/_params.py

@@ -157,7 +157,7 @@ def load_arguments(self, _):
     with self.argument_context('containerapp github-action add') as c:
         c.argument('repo_url', help='The GitHub repository to which the workflow file will be added. In the format: https://github.com/<owner>/<repository-name>')
         c.argument('token', help='A Personal Access Token with write access to the specified repository. For more information: https://help.github.com/en/github/authenticating-to-github/creating-a-personal-access-token-for-the-command-line')
-        c.argument('branch', options_list=['--branch', '-b'], help='The branch of the GitHub repo. Defaults to "main" if not specified.')
+        c.argument('branch', options_list=['--branch', '-b'], help='The branch of the Github repo. Assumed to be the Github repo\'s default branch if not specified.')
         c.argument('login_with_github', help='Interactively log in with Github to retrieve the Personal Access Token')
         c.argument('registry_url', help='The container registry server, e.g. myregistry.azurecr.io')
         c.argument('registry_username', help='The username of the registry. If using Azure Container Registry, we will try to infer the credentials if not supplied')
@@ -236,7 +236,7 @@ def load_arguments(self, _):
     with self.argument_context('containerapp up', arg_group='Github Repo') as c:
         c.argument('repo', help='Create an app via Github Actions. In the format: https://github.com/<owner>/<repository-name> or <owner>/<repository-name>')
         c.argument('token', help='A Personal Access Token with write access to the specified repository. For more information: https://help.github.com/en/github/authenticating-to-github/creating-a-personal-access-token-for-the-command-line. If missing (and using --repo), a browser page will be opened to authenticate with Github.')
-        c.argument('branch', options_list=['--branch', '-b'], help='The branch of the GitHub repo. Defaults to "main"')
+        c.argument('branch', options_list=['--branch', '-b'], help='The branch of the Github repo. Assumed to be the Github repo\'s default branch if not specified.')
         c.argument('context_path', help='Path in the repo from which to run the docker build. Defaults to "./". Dockerfile is assumed to be named "Dockerfile" and in this directory.')
         c.argument('service_principal_client_id', help='The service principal client ID. Used by Github Actions to authenticate with Azure.', options_list=["--service-principal-client-id", "--sp-cid"])
         c.argument('service_principal_client_secret', help='The service principal client secret. Used by Github Actions to authenticate with Azure.', options_list=["--service-principal-client-secret", "--sp-sec"])

src/containerapp/azext_containerapp/_up_utils.py

@@ -404,6 +404,8 @@ def _get_dockerfile_content_from_repo(
     repo = repo_url_to_name(repo_url)
     try:
         r = g.get_repo(repo)
+        if not branch:
+            branch = r.default_branch
     except Exception as e:
         raise ValidationError(f"Could not find repo {repo_url}") from e
     try:

src/containerapp/azext_containerapp/custom.py

@@ -1043,6 +1043,8 @@ def _validate_github(repo, branch, token):
         github_repo = None
         try:
             github_repo = g.get_repo(repo)
+            if not branch:
+                branch = github_repo.default_branch
             if not github_repo.permissions.push or not github_repo.permissions.maintain:
                 raise ValidationError("The token does not have appropriate access rights to repository {}.".format(repo))
             try:
@@ -1062,6 +1064,7 @@ def _validate_github(repo, branch, token):
             if e.data and e.data['message']:
                 error_msg += " Error: {}".format(e.data['message'])
             raise CLIInternalError(error_msg) from e
+    return branch
 
 
 def create_or_update_github_action(cmd,
@@ -1071,7 +1074,7 @@ def create_or_update_github_action(cmd,
                                    registry_url=None,
                                    registry_username=None,
                                    registry_password=None,
-                                   branch="main",
+                                   branch=None,
                                    token=None,
                                    login_with_github=False,
                                    image=None,
@@ -1091,7 +1094,7 @@ def create_or_update_github_action(cmd,
     repo = repo_url_to_name(repo_url)
     repo_url = f"https://github.com/{repo}"  # allow specifying repo as <user>/<repo> without the full github url
 
-    _validate_github(repo, branch, token)
+    branch = _validate_github(repo, branch, token)
 
     source_control_info = None
 
@@ -1104,11 +1107,7 @@ def create_or_update_github_action(cmd,
         source_control_info = SourceControlModel
 
     source_control_info["properties"]["repoUrl"] = repo_url
-
-    if branch:
-        source_control_info["properties"]["branch"] = branch
-    if not source_control_info["properties"]["branch"]:
-        source_control_info["properties"]["branch"] = "main"
+    source_control_info["properties"]["branch"] = branch
 
     azure_credentials = None
 
@@ -2007,7 +2006,7 @@ def containerapp_up(cmd,
                     logs_key=None,
                     repo=None,
                     token=None,
-                    branch="main",
+                    branch=None,
                     browse=False,
                     context_path=None,
                     service_principal_client_id=None,