1  #!/usr/bin/env python
 2  # SPDX-License-Identifier: AGPL-3.0-or-later OR GPL-2.0-or-later OR CERN-OHL-S-2.0+ OR Apache-2.0
 3  # Check if commit message if signed off by author or committer.
 4  # Currently only checks the last commit log
 5  from typing import Dict, Optional
 6  from subprocess import run, PIPE
 7  
 8  r = run(("git", "log", "-n", "1", "--pretty=fuller"), stdout=PIPE)
 9  ids: Dict[str, Optional[str]] = {
10      "Author:": None,
11      "Commit:": None,
12      "Signed-off-by:": None,
13  }
14  for line in r.stdout.decode().split("\n"):
15      for key in ids.keys():
16          if key in line:
17              idx = line.index(key)
18              ids[key] = line[(idx + len(key)):].strip()
19  author = ids["Author:"]
20  committer = ids["Commit:"]
21  signer = ids["Signed-off-by:"]
22  
23  assert author is not None
24  assert committer is not None
25  signer = ids["Signed-off-by:"]
26  if signer is None:
27      raise ValueError("'Signed-off-by:' line not found in commit message")
28  if signer not in (author, committer):
29      raise ValueError(
30          f"Signer '{signer}' differs from author '{author}' and committer '{committer}'",
31      )