get_first_pushdate is failing with `IndexError: tuple index out of range`

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#5,239 opened on Sep 2, 2025 4 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 3/5
Estimated time: 1-2 days
Newbie friendliness: 35/100

Issue type: Bug
Clarity: Needs clarification
Activity status: Stale
Tech stack: python
Domain: tooling

Research direction

Start in bugbug/repository.py at get_first_pushdate, then follow its caller in scripts/commit_retriever.py. Reproduce the bugbug-data-commits failure and determine why hg_log returns no entry; done means the command no longer raises IndexError for this repository state.

Written by the indexing model from the issue text.

Description

Traceback (most recent call last):
  File "/usr/local/bin/bugbug-data-commits", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "/usr/local/lib/python3.12/site-packages/scripts/commit_retriever.py", line 67, in main
    retriever.retrieve_commits(args.limit)
  File "/usr/local/lib/python3.12/site-packages/scripts/commit_retriever.py", line 40, in retrieve_commits
    repository.download_commits(self.repo_dir, revs=revs[i : (i + chunk_size)])
  File "/usr/local/lib/python3.12/site-packages/bugbug/repository.py", line 1370, in download_commits
    first_pushdate = get_first_pushdate(repo_dir)
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/bugbug/repository.py", line 1338, in get_first_pushdate
    return hg_log(hg, [b"0"])[0].pushdate
           ~~~~~~~~~~~~~~~~~~^^^
IndexError: tuple index out of range

Dominant language: Python
Stars: 570
Forks: 351
Avg merge: 2d 13h
Merged PRs (30d): 65

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