fetch-externals

#!/usr/bin/env python
#
# Read a depot_tools style DEPS file and recursively checkout the repos
# listed
#

from __future__ import print_function

import os

# required to make some DEPS files syntactically valid
def Var(var_name):
    return '%s'

def system(cmd):
    print(cmd)
    os.system(cmd)

def systemCaptureOutput(cmd):
    return os.popen(cmd).read()

def checkout_deps(basepath):
    depsfile = os.path.join(basepath, 'DEPS')

    if not os.path.exists(depsfile):
        print('Nothing to do for', depsfile)
        return
    print('Processing deps in', depsfile)

    # evaluate contents of DEPS file
    f = open(depsfile, 'r')
    exec(f.read())

    # process the path:url pairs in deps
    for path in sorted(deps.keys()):
        src = deps[path]

        (url, rev) = src.split('@')
        if path.startswith('src/'):
            path = path[4:]
        print('%s %s %s' % (url, path, rev))

        if not os.path.exists(os.path.join(path, '.git')):
            if url.find('svn') >= 0:
                system('git svn clone -q %s %s -r %s' % (url, path, rev))
            else:
                system('git clone -n %s %s' % (url, path))
                system('cd %s && git reset --hard %s' % (path, rev))
        else:
            if url.find('svn') >= 0:
                system('cd %s && git svn fetch -q -r %s' % (path, rev))
                gitRev = systemCaptureOutput('cd %s && git svn find-rev r%s' % (path, rev))
                system('cd %s && git reset --hard %s' % (path, gitRev))
            else:
                system('cd %s && git fetch %s' % (path, url))
                system('cd %s && git reset --hard %s' % (path, rev))

        # and recurse
        checkout_deps(os.path.join(basepath, path))

    print('Done processing of', depsfile)

checkout_deps('.')