mdw@git.distorted.org.uk Git - stgit/blob - stgit/basedir.py

   1 """Access to the GIT base directory
   2 """
   3
   4 __copyright__ = """
   5 Copyright (C) 2006, Catalin Marinas <catalin.marinas@gmail.com>
   6
   7 This program is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License version 2 as
   9 published by the Free Software Foundation.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with this program; if not, write to the Free Software
  18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  19 """
  20
  21 import os
  22
  23 class BaseDirException(Exception):
  24     pass
  25
  26 def __output(cmd):
  27     f = os.popen(cmd, 'r')
  28     string = f.readline().rstrip()
  29     if f.close():
  30         raise BaseDirException, 'Error: failed to execute "%s"' % cmd
  31     return string
  32
  33 # GIT_DIR value cached
  34 __base_dir = None
  35
  36 def get():
  37     """Return the .git directory location
  38     """
  39     global __base_dir
  40
  41     if not __base_dir:
  42         if 'GIT_DIR' in os.environ:
  43             __base_dir = os.environ['GIT_DIR']
  44         else:
  45             __base_dir = __output('git-rev-parse --git-dir')
  46
  47     return __base_dir