git.py

   1 # Copyright (c) 2005 Fredrik Kuivinen <freku045@student.liu.se>
   2 #
   3 # This program is free software; you can redistribute it and/or modify
   4 # it under the terms of the GNU General Public License version 2 as
   5 # published by the Free Software Foundation.
   6 #
   7 # This program is distributed in the hope that it will be useful,
   8 # but WITHOUT ANY WARRANTY; without even the implied warranty of
   9 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10 # GNU General Public License for more details.
  11 #
  12 # You should have received a copy of the GNU General Public License
  13 # along with this program; if not, write to the Free Software
  14 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  15
  16 import sys, os, re
  17
  18 from ctcore import *
  19
  20 def repoValid():
  21     if not os.environ.has_key('GIT_DIR'):
  22         os.environ['GIT_DIR'] = '.git'
  23
  24     if not os.environ.has_key('GIT_OBJECT_DIRECTORY'):
  25         os.environ['GIT_OBJECT_DIRECTORY'] = os.environ['GIT_DIR'] + '/objects'
  26
  27     if not (os.path.exists(os.environ['GIT_DIR']) and
  28             os.path.exists(os.environ['GIT_DIR'] + '/refs') and
  29             os.path.exists(os.environ['GIT_OBJECT_DIRECTORY']) and
  30             os.path.exists(os.environ['GIT_OBJECT_DIRECTORY'] + '/00')):
  31         print "Git archive not found."
  32         print "Make sure that the current working directory contains a '.git' directory, or\nthat GIT_DIR is set appropriately."
  33         sys.exit(1)
  34
  35 parseDiffRE = re.compile(':([0-9]+) ([0-9]+) ([0-9a-f]{40}) ([0-9a-f]{40}) ([MCRNADUT])([0-9]*)')
  36 def parseDiff(prog):
  37     inp = runProgram(prog)
  38     ret = []
  39     try:
  40         recs = inp.split("\0")
  41         recs.pop() # remove last entry (which is '')
  42         it = recs.__iter__()
  43         while True:
  44             rec = it.next()
  45             m = parseDiffRE.match(rec)
  46
  47             if not m:
  48                 print "Unknown output from " + str(prog) + "!: " + rec + "\n"
  49                 continue
  50
  51             f = File()
  52             f.srcMode = m.group(1)
  53             f.dstMode = m.group(2)
  54             f.srcSHA = m.group(3)
  55             f.dstSHA = m.group(4)
  56             if m.group(5) == 'N':
  57                 f.change = 'A'
  58             else:
  59                 f.change = m.group(5)
  60             f.score = m.group(6)
  61             f.srcName = f.dstName = it.next()
  62
  63             if f.change == 'C' or f.change == 'R':
  64                 f.dstName = it.next()
  65                 f.patch = getPatch(f.srcName, f.dstName)
  66             else:
  67                 f.patch = getPatch(f.srcName)
  68
  69             ret.append(f)
  70     except StopIteration:
  71         pass
  72     return ret
  73
  74
  75 # HEAD is src in the returned File objects. That is, srcName is the
  76 # name in HEAD and dstName is the name in the cache.
  77 def getFiles():
  78     files = parseDiff('git-diff-files -z')
  79     for f in files:
  80         doUpdateCache(f.srcName)
  81
  82     files = parseDiff('git-diff-cache -z -M --cached HEAD')
  83     for f in files:
  84         c = f.change
  85         if   c == 'C':
  86             f.text = 'Copy from ' + f.srcName + ' to ' + f.dstName
  87         elif c == 'R':
  88             f.text = 'Rename from ' + f.srcName + ' to ' + f.dstName
  89         elif c == 'A':
  90             f.text = 'New file: ' + f.srcName
  91         elif c == 'D':
  92             f.text = 'Deleted file: ' + f.srcName
  93         elif c == 'T':
  94             f.text = 'Type change: ' + f.srcName
  95         else:
  96             f.text = f.srcName
  97
  98     return files
  99
 100 def getPatch(file, otherFile = None):
 101     if otherFile:
 102         f = [file, otherFile]
 103     else:
 104         f = [file]
 105     return runProgram(['git-diff-cache', '-p', '-M', '--cached', 'HEAD'] + f)
 106
 107 def doUpdateCache(filename):
 108     runProgram(['git-update-cache', '--remove', '--add', '--replace', filename])
 109
 110 def doCommit(filesToKeep, fileRealNames, msg):
 111     for file in filesToKeep:
 112         # If we have a new file in the cache which we do not want to
 113         # commit we have to remove it from the cache. We will add this
 114         # cache entry back in to the cache at the end of this
 115         # function.
 116         if file.change == 'A':
 117             runProgram(['git-update-cache', '--force-remove',
 118                         '--', file.srcName])
 119         elif file.change == 'R':
 120             runProgram(['git-update-cache', '--force-remove',
 121                         '--', file.dstName])
 122             runProgram(['git-update-cache', '--add', '--replace',
 123                         '--cacheinfo', file.srcMode, file.srcSHA, file.srcName])
 124         else:
 125             runProgram(['git-update-cache', '--add', '--replace',
 126                         '--cacheinfo', file.srcMode, file.srcSHA, file.srcName])
 127
 128     tree = runProgram(['git-write-tree'])
 129     tree = tree.rstrip()
 130
 131     if commitIsMerge():
 132         merge = ['-p', 'MERGE_HEAD']
 133     else:
 134         merge = []
 135     commit = runProgram(['git-commit-tree', tree, '-p', 'HEAD'] + merge, msg)
 136
 137     try:
 138         f = open(os.environ['GIT_DIR'] + '/HEAD', 'w+')
 139         f.write(commit)
 140         f.close()
 141     except OSError, e:
 142         raise CommitError('write to ' + os.environ['GIT_DIR'] + '/HEAD', e.strerror)
 143
 144     try:
 145         os.unlink(os.environ['GIT_DIR'] + '/MERGE_HEAD')
 146     except OSError:
 147         pass
 148
 149     for file in filesToKeep:
 150         # Don't add files that are going to be deleted back to the cache
 151         if file.change != 'D':
 152             runProgram(['git-update-cache', '--add', '--replace', '--cacheinfo',
 153                         file.dstMode, file.dstSHA, file.dstName])
 154
 155         if file.change == 'R':
 156             runProgram(['git-update-cache', '--remove', '--', file.srcName])
 157
 158 def discardFile(file):
 159     runProgram(['git-read-tree', 'HEAD'])
 160     c = file.change
 161     if c == 'M' or c == 'T':
 162         runProgram(['git-checkout-cache', '-f', '-q', '--', file.dstName])
 163     elif c == 'A' or c == 'C':
 164         # The file won't be tracked by git now. We could unlink it
 165         # from the working directory, but that seems a little bit
 166         # too dangerous.
 167         pass
 168     elif c == 'D':
 169         runProgram(['git-checkout-cache', '-f', '-q', '--', file.dstName])
 170     elif c == 'R':
 171         # Same comment applies here as to the 'A' or 'C' case.
 172         runProgram(['git-checkout-cache', '-f', '-q', '--', file.srcName])
 173
 174 def ignoreFile(file):
 175     # Not yet implemented
 176     pass
 177
 178 def commitIsMerge():
 179     try:
 180         os.stat(os.environ['GIT_DIR'] + '/MERGE_HEAD')
 181         return True
 182     except OSError:
 183         return False
 184
 185 def mergeMessage():
 186     return '''This is a merge commit if you do not want to commit a ''' + \
 187            '''merge remove the file $GIT_DIR/MERGE_HEAD.'''