plugins/workdir.py

   1
   2 from yap.yap import YapCore, YapError
   3 from yap.util import get_output, takes_options, run_safely
   4
   5 import os
   6 import tempfile
   7
   8 class WorkdirPlugin(YapCore):
   9     "Create extra work directories of a repository"
  10
  11     def __init__(self, *args, **flags):
  12         super(WorkdirPlugin, self).__init__(*args, **flags)
  13
  14     def _unlock_branch(self, branch):
  15         repo = get_output('git rev-parse --git-dir')[0]
  16         dir = os.path.join(repo, 'yap', 'lock')
  17         try:
  18             os.mkdir(dir)
  19         except OSError:
  20             pass
  21
  22         lockfile = os.path.join(dir, branch.replace('/', '\/'))
  23
  24         try:
  25             os.unlink(lockfile)
  26         except OSError:
  27             pass
  28
  29     def _lock_branch(self, branch, locked_by):
  30         repo = get_output('git rev-parse --git-dir')[0]
  31         dir = os.path.join(repo, 'yap', 'lock')
  32         try:
  33             os.mkdir(dir)
  34         except OSError:
  35             pass
  36
  37         fd, tmplock = tempfile.mkstemp("yap", dir=dir)
  38         os.write(fd, locked_by)
  39         os.close(fd)
  40         while True:
  41             lockfile = os.path.join(dir, branch.replace('/', '\/'))
  42             try:
  43                 os.link(tmplock, lockfile)
  44                 break
  45             except OSError, e:
  46                 try:
  47                     fd = file(lockfile)
  48                 except:
  49                     raise e
  50                 user = fd.readline()
  51                 # If the workdir has been deleted, break his lock
  52                 if os.access(user, os.R_OK):
  53                     raise YapError("That branch is being used by an existing workdir")
  54                 os.unlink(lockfile)
  55                 continue
  56
  57     def cmd_workdir(self, branch, workdir=None):
  58         "<branch> [workdir]"
  59
  60         self._check_git()
  61
  62         branches = get_output("git for-each-ref --format='%(refname)' 'refs/heads'")
  63         if 'refs/heads/%s' % branch not in branches:
  64             raise YapError("Not a branch: %s" % branch)
  65
  66         current = get_output("git symbolic-ref HEAD")[0]
  67
  68         repo = get_output('git rev-parse --git-dir')[0]
  69         repo = os.path.join(os.getcwd(), repo)
  70         repodir = os.path.dirname(repo)
  71         if workdir is None:
  72             repoparent, reponame = os.path.split(repodir)
  73             workdir = os.path.join(repoparent, "%s-%s" % (reponame, branch))
  74
  75         # Make sure the current branch is locked
  76         try:
  77             self._lock_branch(current.replace('refs/heads/', ''), repodir)
  78         except:
  79             pass
  80
  81         self._lock_branch(branch, workdir)
  82
  83         try:
  84             os.mkdir(workdir)
  85         except OSError, e:
  86             raise YapError("Can't create new workdir: %s (%s)" % (workdir, e))
  87
  88         os.chdir(workdir)
  89         os.mkdir(".git")
  90         os.chdir(".git")
  91
  92         for x in ["config", "refs", "logs/refs", "objects", "info",
  93                   "hooks", "packed-refs", "remotes", "svn"]:
  94             if os.path.dirname(x):
  95                 os.makedirs(os.path.dirname(x))
  96             os.symlink(os.path.join(repo, x), x)
  97
  98         run_safely("cp %s HEAD" % os.path.join(repo, 'HEAD'))
  99         os.chdir("..")
 100         run_safely("git symbolic-ref HEAD refs/heads/%s" % branch)
 101         self.cmd_revert(**{'-a': 1})
 102
 103         print "Workdir created at %s for branch %s" % (workdir, branch)
 104
 105     def cmd_switch(self, branch, *args, **flags):
 106         self._check_git()
 107
 108         current = get_output("git symbolic-ref HEAD")[0]
 109
 110         repo = get_output('git rev-parse --git-dir')[0]
 111         self._lock_branch(branch, repo)
 112
 113         try:
 114             super(WorkdirPlugin, self).cmd_switch(branch, *args, **flags)
 115         except:
 116             self._unlock_branch(branch)
 117             raise
 118
 119         self._unlock_branch(current.replace('refs/heads/', ''))