update externals seperately

svn-update-externals-seperately.py

"""
zope's huge facade breaks simple svn update (with 1.6.0 r34332).
"""

import sys
import os.path
from subprocess import Popen, check_call, PIPE


def svn_get_info(args):
    output = Popen(["svn", "info"] + args, stdout=PIPE).communicate()[0]
    col = dict()
    for line in output.splitlines():
        line = line.strip()
        if line:
            k, v = line.strip().split(': ', 1)
            col[k] = v
    return col


def main(args):
    check_call(["svn", "up", "--ignore-externals"] + args)
    path = svn_get_info(args)['Path']
    output = Popen(["svn", "status", "--ignore-externals", path],
                   stdout=PIPE).communicate()[0]
    dirs = set()
    for line in output.splitlines():
        status, tail = line.split(None, 1)
        if status == "X":
            dirs.add(os.path.dirname(tail))
    for dir in dirs:
        output = Popen(["svn", "propget", "svn:externals", dir],
                       stdout=PIPE).communicate()[0]
        for entry in output.splitlines():
            fields = entry.split()
            if not fields:
                continue
            url = fields.pop()
            path = os.path.join(dir, fields.pop(0))
            print "\nFetching external from %s %s" % (path, ' '.join(fields))
            if os.path.exists(path):
                # check URL
                cururl = svn_get_info([path])['URL']
                if cururl != url:
                    check_call(["svn", "switch", url, path] + fields)
                else:
                    check_call(["svn", "up", path] + fields)
            else:
                check_call(["svn", "checkout", url, path] + fields)


exit(main(sys.argv[1:]))