count_backports

   1 #!/usr/bin/python
   2 #
   3 # A hack to count how many commits in a given mainline release were
   4 # backported to a previous series of stable commits.
   5 #
   6 # git log stable..stable | count_backports v5.17
   7 #
   8 import pickle, re
   9 import gitlog
  10
  11 def vmatch(v1, v2):
  12     return v2.startswith(v1)
  13
  14 p_upstream = re.compile(r'commit ([0-9a-f]+) upstream', re.I)
  15 p_upstream2 = re.compile(r'upstream commit ([0-9a-f]+)', re.I)
  16
  17 def upstream(patch):
  18     m = p_upstream.search(patch.changelog) or \
  19         p_upstream2.search(patch.changelog)
  20     if m:
  21         return m.group(1)
  22     return None
  23
  24 db = pickle.load(open('committags.db', 'rb'))
  25 #
  26 # Add 12-char versions of all commit IDs since that's what appears
  27 # in some stable commits. Copy it to a new dict since otherwise the
  28 # keys iterator complains.
  29 #
  30 VDB = { }
  31 for commit in db.keys():
  32     VDB[commit[:12]] = VDB[commit] = db[commit]
  33
  34 versions = { }
  35 seen = 0
  36 input = open(0, 'rb')
  37 patch = gitlog.grabpatch(input)
  38 while patch:
  39     seen += 1
  40     up = upstream(patch)
  41     if up:
  42         if up in VDB:
  43             try:
  44                 versions[VDB[up]] += 1
  45             except KeyError:
  46                 versions[VDB[up]] = 1
  47     patch = gitlog.grabpatch(input)
  48
  49 print(f'{seen} patches seen.')
  50 for v in sorted(versions):
  51     print(f'  {v}: {versions[v]} ({100*versions[v]/seen:.2f}%)')