Git receive/update hooks and new branches

Question

I have a problem with the \'update\' hook. In the case of a new branch, it gets a 0000000000000000000000000000000000000000 as the \'oldrev\'. And I don\'t know how to handle

Answer 1

I just figured it out myself.

git log newref --not otherheads

is the key to get all logs of a branch that are not on any other branch. Below is my python script to check for the correct maximum line length of the commit messages.

import sys
import commands

ref = sys.argv[1]
old = sys.argv[2]
new = sys.argv[3]

x = 0

# only a tag is pushed to server, nothing to check
if ref.find('refs/tags/') >= 0:
  if len(ref.strip('refs/tags/')) > 25:
    print 'tag name is longer than 25 characters'
    exit(1)
  else:
    exit(0)
# either a new branch is pushed or an empty repo is being pushed
if old == '0000000000000000000000000000000000000000':
  heads = commands.getoutput("git for-each-ref --format='%(refname)' 'refs/heads/*'")
  heads = heads.replace(ref+'\n','').replace('\n',' ')
  hashes = commands.getoutput('git log '+new+' --pretty=%H --not '+heads).split('\n')
else:
  hashes = commands.getoutput('git log '+old+'..'+new+' --pretty=%H').split('\n')

for hash in hashes:
  subject = commands.getoutput('git show '+hash+' --format=%s --summary').split('\n')
  body = commands.getoutput('git show '+hash+' --format=%b --summary').split('\n')

  if len(subject[0]) > 75:
    print
    print 'commit: '+hash
    print 'bad commit message(s): header line is too long or second line is not blank (max 75 chars)'
    print 'bad line: "%s"' % subject[0]
    print 'length of header line: %d' % len(subject[0])
    print 'try again with correct message format'
    print
    x = 1

  for line in body: 
    if len(line) > 75:
      print
      print 'commit: '+hash
      print 'bad commit message(s): description lines are too long (max 75 chars)'
      print 'bad line: "%s"' % line
      print 'length of  line: %d' % len(line)
      print 'try again with correct message format'
      print
      x = 1

if x == 0:
  exit(0)
else:
  exit(1)