git-migrate

   1 #!/usr/bin/python
   2
   3 import os
   4 import sys
   5 import subprocess
   6 import shutil
   7
   8 def clonePackage(base, pkg):
   9     if not os.path.isdir('%s.git' % pkg):
  10         if os.path.isdir(pkg):
  11             shutil.rmtree(pkg)
  12         # Use --no-follow-parent because we're going to handle that with
  13         # grafts.
  14         subprocess.check_call(['git', 'svn', 'clone',
  15                                '--no-follow-parent',
  16                                '-Aauthors',
  17                                '-q',
  18                                '--no-metadata',
  19                                '%s/packages/%s' % (base, pkg)],
  20                               stdout=subprocess.PIPE)
  21
  22         # Then make the repository bare, because git-svn can't do this
  23         shutil.move('%s/.git' % pkg, '%s.git' % pkg)
  24         shutil.rmtree(pkg)
  25         subprocess.check_call(['git', 'config', 'core.bare', 'true'],
  26                               cwd='%s.git' % pkg)
  27
  28     # Some of these repos have a rev where everything was deleted
  29     # as a result of the move. We don't want that rev to exist.
  30     p = subprocess.Popen(['git', 'ls-files'],
  31                          cwd='%s.git' % pkg,
  32                          stdout=subprocess.PIPE)
  33     p.wait()
  34     if len(p.stdout.read()) == 0:
  35         subprocess.check_call(['git', 'reset', '--soft', 'HEAD^'],
  36                               cwd='%s.git' % pkg)
  37
  38 def cloneAllPackages(base):
  39     for pkg in open('package-list'):
  40         clonePackage(base, pkg.strip())
  41
  42 def mergeHistory(old_pkg, new_pkg, n):
  43     cwd = os.getcwd()
  44     subprocess.check_call(['git', 'push',
  45                            'file:///%s/%s.git' % (cwd, new_pkg),
  46                            'master:refs/heads/%s' % old_pkg],
  47                           cwd='%s.git' % old_pkg)
  48
  49 def mergeHistories():
  50     merges = []
  51     for line in open('merges'):
  52         line = line.strip()
  53         if line == '' or line[0] == '#':
  54             continue
  55
  56         merges.append(line.split())
  57
  58     for merge in merges:
  59         mergeHistory(*merge)
  60
  61 if __name__ == '__main__':
  62     try:
  63         base = sys.argv[1]
  64     except:
  65         base = 'svn://invirt.mit.edu/trunk'
  66
  67     cloneAllPackages(base)
  68     mergeHistories()