Script to append a git revision hash to the nginx server version.

nginx_version.py

#!/usr/bin/env python2.7
#-*- encoding: utf-8 -*-

# Usage:
# ./nginx_version.py /path/to/nginx/src/core/nginx.h <git hash>
# or:
# /path/to/nginx-codebase-root$ /path/to/nginx_version.py <git hash>

from os.path import abspath
from re import compile
from sys import argv


NGINX_VERSION_RE = compile(r'^(#define\s+NGINX_VERSION\s+)"(\d\.\d{1,2}\.\d{1,2})(?:-g([a-fA-F0-9]{,20}))?"$')


def set_version(nginx_h, git_hash):
    output = []

    with open(nginx_h) as fin:
        for line in fin:
            m = NGINX_VERSION_RE.match(line.strip())
            if m is None:
                output.append(line)
            else:
                if m.group(3) == git_hash:
                    return

                output.append('{}"{}-g{}"\n'.format(m.group(1), m.group(2), git_hash))

    with open(nginx_h, 'w') as out:
        out.write("".join(output))


def print_usage(script_path):
    print "Usage:"
    print "{} /path/to/nginx/src/core/nginx.h <git hash>".format(script_path)
    print "or:"
    print "/path/to/nginx-codebase-root$ {} <git hash>".format(script_path)


if __name__ == "__main__":
    argc = len(argv)

    if argc < 2:
        print_usage(abspath(argv[0]))
        exit(1)

    nginx_h = abspath("src/core/nginx.h" if argc == 2 else argv[1])
    # Ensure the git hash is always read from the expected position,
    # instead of relying on that the command wasn't invoked with
    # extranous arguments by simply reading the last argument.
    git_hash = argv[min(argc - 1, 2)]

    set_version(nginx_h, git_hash)