post-commit hook for tagging a release version

post-commit

#!/usr/bin/python

# place in .git/hooks/post-commit

import commands, re

print "checking for version change...",

status, output = commands.getstatusoutput('git diff HEAD HEAD^ -U0')

version_info = None

for d in output.split("\n"):
    rg = re.compile("\+VERSION\s?\=\s?\((?P<major>[0-9]+)\s?\,\s?(?P<minor>[0-9]+)\s?\,\s?(?P<rev>[0-9]+)\s?\)")
    m  = rg.search(d)
    if m:
       version_info = m.groupdict()
       break

if version_info:
    tag = "%s.%s.%s" % (version_info['major'], version_info['minor'], version_info['rev'])
    status, output = commands.getstatusoutput('git tag -f %s' % tag)
    if status:
       raise Exception('tagging not successful: %s %s' % (output, status))
    print "tagged revision: %s" % tag
else:
    print "none found."