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         try:
  39             os.write(fd, locked_by)
  40             os.close(fd)
  41             while True:
  42                 lockfile = os.path.join(dir, branch.replace('/', '\/'))
  43                 try:
  44                     os.link(tmplock, lockfile)
  45                     break
  46                 except OSError, e:
  47                     try:
  48                         fd = file(lockfile)
  49                     except:
  50                         raise e
  51                     user = fd.readline()
  52                     # If the workdir has been deleted, break his lock
  53                     if os.access(user, os.R_OK):
  54                         raise YapError("That branch is being used by an existing workdir")
  55                     os.unlink(lockfile)
  56                     continue
  57         finally:
  58             os.unlink(tmplock)
  59
  60     def cmd_workdir(self, branch, workdir=None):
  61         "<branch> [workdir]"
  62
  63         self._check_git()
  64
  65         branches = get_output("git for-each-ref --format='%(refname)' 'refs/heads'")
  66         if 'refs/heads/%s' % branch not in branches:
  67             raise YapError("Not a branch: %s" % branch)
  68
  69         current = get_output("git symbolic-ref HEAD")[0]
  70
  71         repo = get_output('git rev-parse --git-dir')[0]
  72         repo = os.path.join(os.getcwd(), repo)
  73         repodir = os.path.dirname(repo)
  74         if workdir is None:
  75             repoparent, reponame = os.path.split(repodir)
  76             workdir = os.path.join(repoparent, "%s-%s" % (reponame, branch))
  77
  78         # Make sure the current branch is locked
  79         try:
  80             self._lock_branch(current.replace('refs/heads/', ''), repodir)
  81         except:
  82             pass
  83
  84         self._lock_branch(branch, workdir)
  85
  86         try:
  87             os.mkdir(workdir)
  88         except OSError, e:
  89             raise YapError("Can't create new workdir: %s (%s)" % (workdir, e))
  90
  91         os.chdir(workdir)
  92         os.mkdir(".git")
  93         os.chdir(".git")
  94
  95         for x in ["config", "refs", "logs/refs", "objects", "info",
  96                   "hooks", "packed-refs", "remotes", "svn"]:
  97             if os.path.dirname(x):
  98                 os.makedirs(os.path.dirname(x))
  99             os.symlink(os.path.join(repo, x), x)
 100
 101         run_safely("cp %s HEAD" % os.path.join(repo, 'HEAD'))
 102         os.chdir("..")
 103         run_safely("git symbolic-ref HEAD refs/heads/%s" % branch)
 104         self.cmd_revert(**{'-a': 1})
 105
 106         print "Workdir created at %s for branch %s" % (workdir, branch)
 107
 108     def cmd_switch(self, branch, *args, **flags):
 109         self._check_git()
 110
 111         current = get_output("git symbolic-ref HEAD")[0]
 112
 113         repo = get_output('git rev-parse --git-dir')[0]
 114         self._lock_branch(branch, repo)
 115
 116         try:
 117             super(WorkdirPlugin, self).cmd_switch(branch, *args, **flags)
 118         except:
 119             self._unlock_branch(branch)
 120             raise
 121
 122         self._unlock_branch(current.replace('refs/heads/', ''))