t/subtree-hash

   1 #!/bin/sh
   2 """": # -*-python-*-
   3 bup_python="$(dirname "$0")/../cmd/bup-python" || exit $?
   4 exec "$bup_python" "$0" ${1+"$@"}
   5 """
   6 # end of bup preamble
   7
   8 from __future__ import absolute_import
   9 import os, sys
  10
  11 from bup.helpers import handle_ctrl_c, readpipe
  12 from bup import options
  13
  14
  15 optspec = """
  16 subtree-hash ROOT_HASH [PATH_ITEM...]
  17 --
  18 """
  19
  20 handle_ctrl_c()
  21
  22 o = options.Options(optspec)
  23 (opt, flags, extra) = o.parse(sys.argv[1:])
  24
  25 if len(extra) < 1:
  26     o.fatal('must specify a root hash')
  27
  28 tree_hash = extra[0]
  29 path = extra[1:]
  30
  31 while path:
  32     target_name = path[0]
  33     subtree_items = readpipe(['git', 'ls-tree', '-z', tree_hash])
  34     target_hash = None
  35     for entry in subtree_items.split('\0'):
  36         if not entry:
  37             break
  38         info, name = entry.split('\t', 1)
  39         if name == target_name:
  40             _, _, target_hash = info.split(' ')
  41             break
  42     if not target_hash:
  43         print >> sys.stderr, "Can't find %r in %s" % (target_name, tree_hash)
  44         break
  45     tree_hash = target_hash
  46     path = path[1:]
  47
  48 if path:
  49     sys.exit(1)
  50
  51 print tree_hash