Manage git subtrees

update-subtrees.py

#!/usr/bin/env python
# Copyright 2011 Michael Komitee. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without modification, are
# permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice, this list of
# conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright notice, this list
# of conditions and the following disclaimer in the documentation and/or other materials
# provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY MICHAEL KOMITEE ``AS IS'' AND ANY EXPRESS OR IMPLIED
# WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
# FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MICHAEl KOMITEE OR
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
# ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# The views and conclusions contained in the software and documentation are those of the
# authors and should not be interpreted as representing official policies, either expressed
# or implied, of Michael Komitee. 
import sys
import os
import re
import subprocess
import csv

class Subtree(object):
    def __init__(self, data):
        self.prefix = data[0]
        self.repository = data[1]
        m = re.search('/([^/]*)$', self.repository)
        base = re.sub('.git$', '', m.group(1))
        if self.prefix == '':
            self.path = base
        else:
            self.path = '%s/%s' % (self.prefix, base)

    def __repr__(self):
        return('''Subtree(path='%s', repository='%s')''' % (self.path, 
                                                              self.repository))

    def is_deployed(self):
        return(os.path.exists(self.path))

    def deploy(self):
        command = ['git', 'subtree']
        if self.is_deployed():
            command.append('pull')
        else:
            command.append('add')
        null = open('/dev/null', 'a')
        out  = open('/dev/stdout', 'a')
        err  = open('/dev/stdout', 'a')
        command += ['--prefix', self.path, '--squash', self.repository, 'master']
        print(' '.join(command))
        try:
            subprocess.check_call(command, stdin=null, stdout=out, stderr=err)
        except subprocess.CalledProcessError:
            sys.exit(1)
        out.close()
        err.close()
        null.close()


def git_status():
    null = open('/dev/null', 'a')
    command = ['git', 'status']
    try:
        subprocess.check_call(command, stdin=null, stdout=null, stderr=null)
    except subprocess.CalledProcessError:
        sys.stderr.write("Problem checking git status\n")
        sys.exit(1)
    null.close()


def read_subtrees(config_file):
    config = csv.reader(open(config_file), delimiter=',')
    subtrees = [Subtree(line) for line in config]
    return subtrees


if __name__ == '__main__':
    git_status()
    # repositories.csv should be a csv file with two fields per line. The
    # first field is where in your repository (relative path) you want the
    # subtree installed, and the second should be the git repositories url
    # e.g:
    # vim/bundle,git://github.com/vim-scripts/Gist.vim.git
    for subtree in read_subtrees('repositories.csv'):
        subtree.deploy()

# vim: set ft=python ts=4 sw=4 et: