#!/usr/bin/env python

# metabuild-gitball: "make dist" equivalent that uses git
# Creates a foo-version.commitid.tar.bz2 file.
# 
# Copyright 2011 Colin Walters <walters@verbum.org>
# Licensed under the new-BSD license (http://www.opensource.org/licenses/bsd-license.php)

import os
import sys
import re
import subprocess

def fatal(msg):
    sys.stderr.write(msg + "\n")
    sys.exit(1)

def _extract_config_log_variable(name):
    f = open('config.log')
    keystart = name + '=\''
    for line in f:
        if line.startswith(keystart):
            return line[len(keystart):-2]
    f.close()
    fatal("Failed to find '%s' in config.status" % (name, ))

if not os.path.isfile('config.log'):
    fatal("Couldn't find config.log; did you run configure?")
package = _extract_config_log_variable('PACKAGE_TARNAME')
version = _extract_config_log_variable('VERSION')

commitid = subprocess.Popen(['git', 'rev-parse', 'HEAD'], stdout=subprocess.PIPE).communicate()[0]
commitid = commitid[0:8]
prefix = '%s-%s.%s' % (package, version, commitid)
target_filename = '%s.tar.bz2' % (prefix, )
gitproc = subprocess.Popen(['git', 'archive', '--format=tar',
                            '--prefix=%s/' % (prefix, ), 'HEAD'], stdout=subprocess.PIPE,
                           stderr=sys.stderr)
tarfile_f = open(target_filename, 'w')
bzproc = subprocess.Popen(['bzip2', '-c'], stdout=tarfile_f, stdin=gitproc.stdout, stderr=sys.stderr)
tarfile_f.close()
bzproc.wait()
print "Created %s" % (target_filename, )