Bug 937447 – emaint of package portage shows strange output

• Product: Portage Development
• Status: UNCONFIRMED ---

[Description Ulrich Serfling 2024-08-06 10:10:39 UTC]

syncing repos with emaint works (portage version 3.0.65-r1) but shows additional strange (to me) output.
Older version 3.0.63-r2 does not show this behaviour.
Gentoo forum suggested: "It looks like a bug with a recently added feature (repo revisions) in Portage."

root@maxwell:~ # emaint sync --repo science
>>> Syncing repository 'science' into '/var/db/repos/science'...
/usr/bin/git fetch origin --depth 1
warning: redirecting to https://anongit.gentoo.org/git/proj/sci.git/
remote: Total 0 (delta 0), reused 0 (delta 0), pack-reused 0 (from 0)
/usr/bin/git reset --merge refs/remotes/origin/master
=== Sync completed for science
Traceback (most recent call last):
  File "/usr/lib/python3.12/site-packages/portage/util/_async/AsyncFunction.py", line 41, in _target_wrapper
    result = target(*args, **kwargs)
             ^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/portage/sync/controller.py", line 178, in sync
    get_repo_revision_history(self.settings["EROOT"], [repo])
  File "/usr/lib/python3.12/site-packages/portage/sync/revision_history.py", line 67, in get_repo_revision_history
    return _maybe_update_revisions(eroot, items)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/portage/sync/revision_history.py", line 98, in _maybe_update_revisions
    previous_revisions = json.load(f)
                         ^^^^^^^^^^^^
  File "/usr/lib/python3.12/json/__init__.py", line 293, in load
    return loads(fp.read(),
           ^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/json/__init__.py", line 346, in loads
    return _default_decoder.decode(s)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/json/decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/json/decoder.py", line 355, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

Action: sync for repo: science, returned code = 1


root@maxwell:~ #