Issue #597: Handle Temporary Redirect when a repository or organizati…

…on name was changed (#604)

git_machete/github.py

@@ -10,7 +10,7 @@
 import urllib.request
 import urllib.error
 
-from git_machete.utils import debug, fmt
+from git_machete.utils import debug, fmt, warn
 from git_machete.exceptions import MacheteException, UnprocessableEntityHTTPError
 from git_machete.git_operations import GitContext, LocalBranchShortName
 
@@ -196,7 +196,7 @@ def __fire_github_api_request(method: str, path: str, token: Optional[str], requ
             error_reason: str = __extract_failure_info_from_422(error_response)
             raise UnprocessableEntityHTTPError(error_reason)
         elif err.code in (http.HTTPStatus.UNAUTHORIZED, http.HTTPStatus.FORBIDDEN):
-            first_line = f'GitHub API returned {err.code} HTTP status with error message: `{err.reason}`\n'
+            first_line = f'GitHub API returned `{err.code}` HTTP status with error message: `{err.reason}`\n'
             if token:
                 raise MacheteException(first_line + f'Make sure that the GitHub API token provided by the {__get_github_token_provider()} '
                                                     f'is valid and allows for access to `{method.upper()}` `https://{host}{path}`.\n'
@@ -214,8 +214,31 @@ def __fire_github_api_request(method: str, path: str, token: Optional[str], requ
                 f'`{method} {url}` request ended up in 404 response from GitHub. A valid GitHub API token is required.\n'
                 f'Provide a GitHub API token with `repo` access via one of the: {get_github_token_possible_providers()} '
                 'Visit `https://github.com/settings/tokens` to generate a new one.')  # TODO (#164): make dedicated exception here
+        elif err.code == http.HTTPStatus.TEMPORARY_REDIRECT:
+            if err.headers['Location'] is not None:
+                if len(err.headers['Location'].split('/')) >= 5:
+                    current_repo_and_org = get_repo_and_org_names_by_id(err.headers['Location'].split('/')[4])
+            else:
+                first_line = fmt(f'GitHub API returned `{err.code}` HTTP status with error message: `{err.reason}`\n')
+                raise MacheteException(
+                    first_line + 'It looks like the organization or repository name got changed recently and is outdated.\n'
+                    'Inferring current organization or repository... -> Cannot infer current organization or repository\n'
+                    'Update your remote repository manually via: `git remote set-url <remote_name> <new_repository_url>`.')
+            # err.headers is a case-insensitive dict of class Message with the `__getitem__` and `get` functions implemented in
+            # https://github.com/python/cpython/blob/3.10/Lib/email/message.py
+            pulls_or_issues_api_suffix = "/".join(path.split("/")[4:])
+            new_path = f'/repos/{current_repo_and_org}/{pulls_or_issues_api_suffix}'
+            # for example when creating a new PR, new_path='/repos/new_org_name/new_repo_name/pulls'
+            warn(f'GitHub API returned `{err.code}` HTTP status with error message: `{err.reason}`. \n'
+                 'It looks like the organization or repository name got changed recently and is outdated.\n'
+                 'Inferring current organization or repository... '
+                 f'New organization = `{current_repo_and_org.split("/")[0]}`, '
+                 f'new repository = `{current_repo_and_org.split("/")[1]}`.\n'
+                 'You can update your remote repository via: `git remote set-url <remote_name> <new_repository_url>`.',
+                 end='')
+            return __fire_github_api_request(method=method, path=new_path, token=token, request_body=request_body)
         else:
-            first_line = fmt(f'GitHub API returned {err.code} HTTP status with error message: `{err.reason}`\n')
+            first_line = fmt(f'GitHub API returned `{err.code}` HTTP status with error message: `{err.reason}`\n')
             raise MacheteException(
                 first_line + "Please open an issue regarding this topic under link: https://github.com/VirtusLab/git-machete/issues/new")
     except OSError as e:
@@ -316,6 +339,12 @@ def checkout_pr_refs(git: GitContext, remote: str, pr_number: int, branch: Local
     git.checkout(branch)
 
 
+def get_repo_and_org_names_by_id(repo_id: str) -> str:
+    token: Optional[str] = __get_github_token()
+    repo = __fire_github_api_request('GET', f'/repositories/{repo_id}', token)
+    return str(repo['full_name'])
+
+
 def get_github_token_possible_providers() -> str:
     return (f'\n\t1. `{GITHUB_TOKEN_ENV_VAR}` environment variable.\n'
             '\t2. Content of the `~/.github-token` file.\n'