git.py

   1 import sys, os, re
   2
   3 from ctcore import *
   4
   5 def repoValid():
   6     if not os.environ.has_key('GIT_DIR'):
   7         os.environ['GIT_DIR'] = '.git'
   8
   9     if not os.environ.has_key('GIT_OBJECT_DIRECTORY'):
  10         os.environ['GIT_OBJECT_DIRECTORY'] = os.environ['GIT_DIR'] + '/objects'
  11
  12     if not (os.path.exists(os.environ['GIT_DIR']) and
  13             os.path.exists(os.environ['GIT_DIR'] + '/refs') and
  14             os.path.exists(os.environ['GIT_OBJECT_DIRECTORY']) and
  15             os.path.exists(os.environ['GIT_OBJECT_DIRECTORY'] + '/00')):
  16         print "Git archive not found."
  17         print "Make sure that the current working directory contains a '.git' directory, or\nthat GIT_DIR is set appropriately."
  18         sys.exit(1)
  19
  20 parseDiffRE = re.compile(':([0-9]+) ([0-9]+) ([0-9a-f]{40}) ([0-9a-f]{40}) ([MCRNADUT])([0-9]*)')
  21 def parseDiff(prog):
  22     inp = runProgram(prog)
  23     ret = []
  24     try:
  25         recs = inp.split("\0")
  26         recs.pop() # remove last entry (which is '')
  27         it = recs.__iter__()
  28         while True:
  29             rec = it.next()
  30             m = parseDiffRE.match(rec)
  31
  32             if not m:
  33                 print "Unknown output from " + str(prog) + "!: " + rec + "\n"
  34                 continue
  35
  36             f = File()
  37             f.srcMode = m.group(1)
  38             f.dstMode = m.group(2)
  39             f.srcSHA = m.group(3)
  40             f.dstSHA = m.group(4)
  41             if m.group(5) == 'N':
  42                 f.change = 'A'
  43             else:
  44                 f.change = m.group(5)
  45             f.score = m.group(6)
  46             f.srcName = f.dstName = it.next()
  47
  48             if f.change == 'C' or f.change == 'R':
  49                 f.dstName = it.next()
  50                 f.patch = getPatch(f.srcName, f.dstName)
  51             else:
  52                 f.patch = getPatch(f.srcName)
  53
  54             ret.append(f)
  55     except StopIteration:
  56         pass
  57     return ret
  58
  59
  60 # HEAD is src in the returned File objects. That is, srcName is the
  61 # name in HEAD and dstName is the name in the cache.
  62 def getFiles():
  63     files = parseDiff('git-diff-files -z')
  64     for f in files:
  65         doUpdateCache(f.srcName)
  66
  67     files = parseDiff('git-diff-cache -z -M --cached HEAD')
  68     for f in files:
  69         c = f.change
  70         if   c == 'C':
  71             f.text = 'Copy from ' + f.srcName + ' to ' + f.dstName
  72         elif c == 'R':
  73             f.text = 'Rename from ' + f.srcName + ' to ' + f.dstName
  74         elif c == 'A':
  75             f.text = 'New file: ' + f.srcName
  76         elif c == 'D':
  77             f.text = 'Deleted file: ' + f.srcName
  78         elif c == 'T':
  79             f.text = 'Type change: ' + f.srcName
  80         else:
  81             f.text = f.srcName
  82
  83     return files
  84
  85 def getPatch(file, otherFile = None):
  86     if otherFile:
  87         f = [file, otherFile]
  88     else:
  89         f = [file]
  90     return runProgram(['git-diff-cache', '-p', '-M', '--cached', 'HEAD'] + f)
  91
  92 def doUpdateCache(filename):
  93     runProgram(['git-update-cache', '--remove', '--add', '--replace', filename])
  94
  95 def doCommit(filesToKeep, fileRealNames, msg):
  96     for file in filesToKeep:
  97         # If we have a new file in the cache which we do not want to
  98         # commit we have to remove it from the cache. We will add this
  99         # cache entry back in to the cache at the end of this
 100         # function.
 101         if file.change == 'A':
 102             runProgram(['git-update-cache', '--force-remove', file.srcName])
 103         else:
 104             runProgram(['git-update-cache', '--add', '--replace', '--cacheinfo',
 105                         file.srcMode, file.srcSHA, file.srcName])
 106
 107     tree = runProgram(['git-write-tree'])
 108     tree = tree.rstrip()
 109     commit = runProgram(['git-commit-tree', tree, '-p', 'HEAD'], msg)
 110
 111     try:
 112         f = open(os.environ['GIT_DIR'] + '/HEAD', 'w+')
 113         f.write(commit)
 114         f.close()
 115     except OSError, e:
 116         raise CommitError('write to ' + os.environ['GIT_DIR'] + '/HEAD', e.strerror)
 117
 118     try:
 119         os.unlink(os.environ['GIT_DIR'] + '/MERGE_HEAD')
 120     except OSError:
 121         pass
 122
 123     for file in filesToKeep:
 124         # Don't add files that are going to be deleted back to the cache
 125         if file.change != 'D':
 126             runProgram(['git-update-cache', '--add', '--replace', '--cacheinfo',
 127                         file.dstMode, file.dstSHA, file.dstName])
 128
 129 def discardFile(file):
 130     runProgram(['git-read-tree', 'HEAD'])
 131     c = file.change
 132     if c == 'M' or c == 'T':
 133         runProgram(['git-checkout-cache', '-f', '-q', '--', file.dstName])
 134     elif c == 'A' or c == 'C':
 135         # The file won't be tracked by git now. We could unlink it
 136         # from the working directory, but that seems a little bit
 137         # too dangerous.
 138         pass
 139     elif c == 'D':
 140         runProgram(['git-checkout-cache', '-f', '-q', '--', file.dstName])
 141     elif c == 'R':
 142         # Same comment applies here as to the 'A' or 'C' case.
 143         runProgram(['git-checkout-cache', '-f', '-q', '--', file.srcName])
 144
 145 def ignoreFile(file):
 146     # Not yet implemented
 147     pass