git error: cannot spawn .git/hooks/post-commit: No such file or directory

Question

I'm trying to write a post-commit hook, I have a Git repository on a mapped drive (V:), msysgit installed in C:\Git, and Python in C:\Python26.

I'm running TortoiseGit on Windows 7 64 Bit.

The script is:

#!C:/Python26/python

import sys
from subprocess import Popen, PIPE, call

GIT_PATH = 'C:\Git\bin\git.exe'
BRANCHES = ['master']
TRAC_ENV = 'C:\TRAC_ENV'
REPO_NAME = 'core'

def call_git(command, args):
    return Popen([GIT_PATH, command] + args, stdout=PIPE).communicate()[0]

def handle_ref(old, new, ref):
    # If something else than the master branch (or whatever is contained by the
    # constant BRANCHES) was pushed, skip this ref.
    if not ref.startswith('refs/heads/') or ref[11:] not in BRANCHES:
        return

    # Get the list of hashs for commits in the changeset.
    args = (old == '0' * 40) and [new] or [new, '^' + old]
    pending_commits = call_git('rev-list', args).splitlines()[::-1]

    call(["trac-admin", TRAC_ENV, "changeset", "added", REPO_NAME] + pending_commits)

if __name__ == '__main__':
    for line in sys.stdin:
        handle_ref(*line.split())

If I run the "git commit..." command from command line, it doesn't seem to even run the hook script at all.

So... the error in the title of your question happens when you try to commit through TortoiseGit, and a command-line commit works successfully (just without executing the hook), right? Is the hook indeed in `.git/hooks/post-commit`, and executable? — Cascabel, Nov 12 '10 at 21:06

score 2 · Accepted Answer · answered Nov 13 '10 at 00:21

According to the githooks man page,

[The post-commit hook] is invoked by git-commit. It takes no parameter, and is invoked after a commit is made.

It takes no parameters. In Python, that means sys.argv[1:] will be an empty list. The man page doesn't say what, if anything, is sent to stdin, but presumably nothing. Let's check that.

I made a little git directory and put this in .git/hooks/post-commit:

#!/usr/bin/env python 
import sys
def handle_ref(old, new, ref):
    with open('/tmp/out','w') as f:
        f.write(old,new,ref)
if __name__ == '__main__':
    with open('/tmp/out','w') as f:
        f.write('post-commit running')
    for line in sys.stdin:
        handle_ref(*line.split())
        with open('/tmp/out','w') as f:
            f.write('Got here')

and made it executable.

When I make a commit I see the /tmp/out file has been created, but its only contents are

post-commit running

So the script ran, but the for line in sys.stdin: loop does nothing since nothing is sent to sys.stdin.

You're going to need to generate the arguments to send to handle_ref in some other way, perhaps through a subprocess call to some git command.

git error: cannot spawn .git/hooks/post-commit: No such file or directory

1 Answers1