How do we verify commit messages for a push?

Question

Coming from CVS, we have a policy that commit messages should be tagged with a bug number (simple suffix \"... [9999]\"). A CVS script checks this during commits and rejects

Answer 1

This is a python version of pre-receive, which took me a while to finish, hope it could help others. I mainly use it with Trac, but it could be easily modified for other purposes.

I have also put down the instructions to modify back the historical commit message, which is a little more complicated than I thought.

#!/usr/bin/env python
import subprocess

import sys 
import re

def main():
    input  = sys.stdin.read()
    oldrev, newrev, refname = input.split(" ")
    separator = "----****----"


    proc = subprocess.Popen(["git", "log", "--format=%H%n%ci%n%s%b%n" + separator, oldrev + ".." +  newrev], stdout=subprocess.PIPE)
    message = proc.stdout.read()
    commit_list = message.strip().split(separator)[:-1] #discard the last line

    is_valid = True

    print "Parsing message:"
    print message

    for commit in commit_list:
        line_list = commit.strip().split("\n")
        hash = line_list[0]
        date = line_list[1]
        content = " ".join(line_list[2:])
        if not re.findall("refs *#[0-9]+", content): #check for keyword
            is_valid = False

    if not is_valid:
        print "Please hook a trac ticket when commiting the source code!!!" 
        print "Use this command to change commit message (one commit at a time): "
        print "1. run: git rebase --interactive " + oldrev + "^" 
        print "2. In the default editor, modify 'pick' to 'edit' in the line whose commit you want to modify"
        print "3. run: git commit --amend"
        print "4. modify the commit message"
        print "5. run: git rebase --continue"
        print "6. remember to add the ticket number next time!"
        print "reference: http://stackoverflow.com/questions/1186535/how-to-modify-a-specified-commit"

        sys.exit(1)

main()