[git] AttributeError: '_GraphWalker' object has no attribute 'shallow'

[zhquan]

When I ran Mordred, I got this error

2025-08-21 11:23:05,767 - GrimoireLab - grimoire_elk.elk - ERROR - Error feeding raw from git (https://github.com/**.git): '_GraphWalker' object has no attribute 'shallow'
Traceback (most recent call last):
  File "/usr/local/lib/python3.12/site-packages/grimoire_elk/elk.py", line 209, in feed_backend
    ocean_backend.feed(**params)
  File "/usr/local/lib/python3.12/site-packages/grimoire_elk/raw/elastic.py", line 234, in feed
    self.feed_items(items)
  File "/usr/local/lib/python3.12/site-packages/grimoire_elk/raw/elastic.py", line 250, in feed_items
    for item in items:
                ^^^^^
  File "/usr/local/lib/python3.12/site-packages/perceval/backend.py", line 316, in fetch
    for item in self.fetch_items(category, **kwargs):
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/perceval/backends/core/git.py", line 166, in fetch_items
    commits = self._fetch_from_repo(from_date, to_date, branches,
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/perceval/backends/core/git.py", line 299, in _fetch_from_repo
    commits = self._fetch_newest_commits_from_repo(repo)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/perceval/backends/core/git.py", line 336, in _fetch_newest_commits_from_repo
    hashes = repo.sync()
             ^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/perceval/backends/core/git.py", line 1111, in sync
    pack_name, refs = self._fetch_pack()
                      ^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/perceval/backends/core/git.py", line 1336, in _fetch_pack
    result = client.fetch_pack(repo_path,
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/dulwich/client.py", line 3009, in fetch_pack
    (new_shallow, new_unshallow) = _handle_upload_pack_head(
                                   ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/dulwich/client.py", line 597, in _handle_upload_pack_head
    if depth not in (0, None) or graph_walker.shallow:
                                 ^^^^^^^^^^^^^^^^^^^^
AttributeError: '_GraphWalker' object has no attribute 'shallow'

[jjmerchante]

A commit in Dulwich introduced a bug in the library (jelmer/dulwich@01bd7a4#diff-4892c787e6ba376b2ad0d9e24b3c7d6398b8ec53112c369df2ab664d921adb25R596
). The graph_walker does not require the shallow method, but that commit attempts to call it. This fails because the current implementation in Perceval only provides the methods ack and next, as defined in its documentation.

A later commit fixes the bug, but there isn't a release available right now.

[jjmerchante]

Adding a new commit to the repository with the latest version:

perceval git --latest-items https://github.com/xxx/yyy.git
[2025-08-21 14:21:58,943] - Sir Perceval is on his quest.
[2025-08-21 14:21:58,944] - Fetching latest commits: 'https://github.com/xxx/yyy.git' git repository
[2025-08-21 14:21:59,879] - Error!: '_GraphWalker' object has no attribute 'shallow'
[2025-08-21 14:21:59,879] - Sir Perceval completed his quest.