category - git :: Sacha Chua

A git post-commit hook for tagging my subed.el release version

Oct 23, 2024| git, emacs, subed

Debian uses Git repository tags to notice when to update packages. I kept forgetting to tag subed's versions, so now I made a git post-commit hook which I think will do the trick. I based it on https://gist.github.com/ajmirsky/1245103, just updated for Python 3 and tweaked to work with how I do versions in subed.el. I've also added it to my README.org.

#!/usr/bin/python

# place in .git/hooks/post-commit
# Based on https://gist.github.com/ajmirsky/1245103

import subprocess
import re

print("checking for version change...",)

output = subprocess.check_output(['git', 'diff', 'HEAD^', 'HEAD', '-U0']).decode("utf-8")

version_info = None
for d in output.split("\n"):
    rg = re.compile(r'\+(?:;;\s+)?Version:\s+(?P<major>[0-9]+)\.(?P<minor>[0-9]+)\.(?P<rev>[0-9]+)')
    m = rg.search(d)
    if m:
        version_info = m.groupdict()
        break

if version_info:
    tag = "v%s.%s.%s" % (version_info['major'], version_info['minor'], version_info['rev'])
    existing = subprocess.check_output(['git', 'tag']).decode("utf-8").split("\n")
    if tag in existing:
        print("%s is already tagged, not updating" % tag)
    else:
        result = subprocess.run(['git', 'tag', '-f', tag])
        if result.returncode:
            raise Exception('tagging not successful: %s %s' % (result.stdout, result.returncode))
        print("tagged revision: %s" % tag)
else:
    print("none found.")

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Categories: git