mirror of
https://github.com/git/git
synced 2024-10-30 04:01:21 +00:00
439 lines
14 KiB
Python
Executable file
439 lines
14 KiB
Python
Executable file
#!/usr/bin/python
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import sys, math, random, os, re, signal, tempfile, stat, errno, traceback
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from heapq import heappush, heappop
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from sets import Set
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sys.path.append('@@GIT_PYTHON_PATH@@')
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from gitMergeCommon import *
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# The actual merge code
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# ---------------------
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originalIndexFile = os.environ.get('GIT_INDEX_FILE',
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os.environ.get('GIT_DIR', '.git') + '/index')
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temporaryIndexFile = os.environ.get('GIT_DIR', '.git') + \
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'/merge-recursive-tmp-index'
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def setupIndex(temporary):
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try:
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os.unlink(temporaryIndexFile)
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except OSError:
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pass
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if temporary:
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newIndex = temporaryIndexFile
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os.environ
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else:
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newIndex = originalIndexFile
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os.environ['GIT_INDEX_FILE'] = newIndex
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def merge(h1, h2, branch1Name, branch2Name, graph, callDepth=0):
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'''Merge the commits h1 and h2, return the resulting virtual
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commit object and a flag indicating the cleaness of the merge.'''
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assert(isinstance(h1, Commit) and isinstance(h2, Commit))
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assert(isinstance(graph, Graph))
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def infoMsg(*args):
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sys.stdout.write(' '*callDepth)
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printList(args)
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infoMsg('Merging:')
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infoMsg(h1)
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infoMsg(h2)
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sys.stdout.flush()
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ca = getCommonAncestors(graph, h1, h2)
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infoMsg('found', len(ca), 'common ancestor(s):')
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for x in ca:
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infoMsg(x)
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sys.stdout.flush()
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Ms = ca[0]
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for h in ca[1:]:
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[Ms, ignore] = merge(Ms, h,
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'Temporary shared merge branch 1',
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'Temporary shared merge branch 2',
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graph, callDepth+1)
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assert(isinstance(Ms, Commit))
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if callDepth == 0:
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setupIndex(False)
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cleanCache = False
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else:
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setupIndex(True)
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runProgram(['git-read-tree', h1.tree()])
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cleanCache = True
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[shaRes, clean] = mergeTrees(h1.tree(), h2.tree(), Ms.tree(),
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branch1Name, branch2Name,
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cleanCache)
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if clean or cleanCache:
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res = Commit(None, [h1, h2], tree=shaRes)
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graph.addNode(res)
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else:
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res = None
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return [res, clean]
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getFilesRE = re.compile(r'^([0-7]+) (\S+) ([0-9a-f]{40})\t(.*)$', re.S)
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def getFilesAndDirs(tree):
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files = Set()
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dirs = Set()
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out = runProgram(['git-ls-tree', '-r', '-z', tree])
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for l in out.split('\0'):
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m = getFilesRE.match(l)
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if m:
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if m.group(2) == 'tree':
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dirs.add(m.group(4))
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elif m.group(2) == 'blob':
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files.add(m.group(4))
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return [files, dirs]
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class CacheEntry:
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def __init__(self, path):
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class Stage:
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def __init__(self):
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self.sha1 = None
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self.mode = None
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self.stages = [Stage(), Stage(), Stage()]
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self.path = path
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unmergedRE = re.compile(r'^([0-7]+) ([0-9a-f]{40}) ([1-3])\t(.*)$', re.S)
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def unmergedCacheEntries():
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'''Create a dictionary mapping file names to CacheEntry
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objects. The dictionary contains one entry for every path with a
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non-zero stage entry.'''
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lines = runProgram(['git-ls-files', '-z', '--unmerged']).split('\0')
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lines.pop()
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res = {}
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for l in lines:
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m = unmergedRE.match(l)
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if m:
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mode = int(m.group(1), 8)
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sha1 = m.group(2)
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stage = int(m.group(3)) - 1
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path = m.group(4)
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if res.has_key(path):
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e = res[path]
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else:
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e = CacheEntry(path)
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res[path] = e
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e.stages[stage].mode = mode
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e.stages[stage].sha1 = sha1
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else:
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die('Error: Merge program failed: Unexpected output from', \
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'git-ls-files:', l)
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return res
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def mergeTrees(head, merge, common, branch1Name, branch2Name,
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cleanCache):
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'''Merge the trees 'head' and 'merge' with the common ancestor
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'common'. The name of the head branch is 'branch1Name' and the name of
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the merge branch is 'branch2Name'. Return a tuple (tree, cleanMerge)
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where tree is the resulting tree and cleanMerge is True iff the
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merge was clean.'''
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assert(isSha(head) and isSha(merge) and isSha(common))
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if common == merge:
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print 'Already uptodate!'
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return [head, True]
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if cleanCache:
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updateArg = '-i'
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else:
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updateArg = '-u'
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runProgram(['git-read-tree', updateArg, '-m', common, head, merge])
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cleanMerge = True
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[tree, code] = runProgram('git-write-tree', returnCode=True)
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tree = tree.rstrip()
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if code != 0:
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[files, dirs] = getFilesAndDirs(head)
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[filesM, dirsM] = getFilesAndDirs(merge)
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files.union_update(filesM)
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dirs.union_update(dirsM)
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cleanMerge = True
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entries = unmergedCacheEntries()
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for name in entries:
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if not processEntry(entries[name], branch1Name, branch2Name,
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files, dirs, cleanCache):
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cleanMerge = False
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if cleanMerge or cleanCache:
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tree = runProgram('git-write-tree').rstrip()
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else:
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tree = None
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else:
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cleanMerge = True
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return [tree, cleanMerge]
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def processEntry(entry, branch1Name, branch2Name, files, dirs, cleanCache):
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'''Merge one cache entry. 'files' is a Set with the files in both of
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the heads that we are going to merge. 'dirs' contains the
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corresponding data for directories. If 'cleanCache' is True no
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non-zero stages will be left in the cache for the path
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corresponding to the entry 'entry'.'''
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# cleanCache == True => Don't leave any non-stage 0 entries in the cache and
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# don't update the working directory
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# False => Leave unmerged entries and update the working directory
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# clean == True => non-conflict case
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# False => conflict case
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# If cleanCache == False then the cache shouldn't be updated if clean == False
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def updateFile(clean, sha, mode, path, onlyWd=False):
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updateCache = not onlyWd and (cleanCache or (not cleanCache and clean))
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updateWd = onlyWd or (not cleanCache and clean)
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if updateWd:
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prog = ['git-cat-file', 'blob', sha]
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if stat.S_ISREG(mode):
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try:
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os.unlink(path)
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except OSError:
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pass
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if mode & 0100:
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mode = 0777
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else:
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mode = 0666
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fd = os.open(path, os.O_WRONLY | os.O_TRUNC | os.O_CREAT, mode)
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proc = subprocess.Popen(prog, stdout=fd)
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proc.wait()
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os.close(fd)
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elif stat.S_ISLNK(mode):
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linkTarget = runProgram(prog)
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os.symlink(linkTarget, path)
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else:
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assert(False)
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if updateWd and updateCache:
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runProgram(['git-update-index', '--add', '--', path])
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elif updateCache:
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runProgram(['git-update-index', '--add', '--cacheinfo',
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'0%o' % mode, sha, path])
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def removeFile(clean, path):
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if cleanCache or (not cleanCache and clean):
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runProgram(['git-update-index', '--force-remove', '--', path])
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if not cleanCache and clean:
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try:
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os.unlink(path)
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except OSError, e:
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if e.errno != errno.ENOENT and e.errno != errno.EISDIR:
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raise
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def uniquePath(path, branch):
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newPath = path + '_' + branch
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suffix = 0
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while newPath in files or newPath in dirs:
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suffix += 1
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newPath = path + '_' + branch + '_' + str(suffix)
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files.add(newPath)
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return newPath
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debug('processing', entry.path, 'clean cache:', cleanCache)
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cleanMerge = True
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path = entry.path
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oSha = entry.stages[0].sha1
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oMode = entry.stages[0].mode
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aSha = entry.stages[1].sha1
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aMode = entry.stages[1].mode
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bSha = entry.stages[2].sha1
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bMode = entry.stages[2].mode
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assert(oSha == None or isSha(oSha))
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assert(aSha == None or isSha(aSha))
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assert(bSha == None or isSha(bSha))
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assert(oMode == None or type(oMode) is int)
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assert(aMode == None or type(aMode) is int)
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assert(bMode == None or type(bMode) is int)
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if (oSha and (not aSha or not bSha)):
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#
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# Case A: Deleted in one
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#
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if (not aSha and not bSha) or \
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(aSha == oSha and not bSha) or \
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(not aSha and bSha == oSha):
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# Deleted in both or deleted in one and unchanged in the other
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if aSha:
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print 'Removing ' + path
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removeFile(True, path)
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else:
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# Deleted in one and changed in the other
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cleanMerge = False
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if not aSha:
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print 'CONFLICT (del/mod): "' + path + '" deleted in', \
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branch1Name, 'and modified in', branch2Name, \
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'. Version', branch2Name, ' of "' + path + \
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'" left in tree'
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mode = bMode
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sha = bSha
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else:
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print 'CONFLICT (mod/del): "' + path + '" deleted in', \
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branch2Name, 'and modified in', branch1Name + \
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'. Version', branch1Name, 'of "' + path + \
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'" left in tree'
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mode = aMode
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sha = aSha
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updateFile(False, sha, mode, path)
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elif (not oSha and aSha and not bSha) or \
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(not oSha and not aSha and bSha):
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#
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# Case B: Added in one.
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#
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if aSha:
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addBranch = branch1Name
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otherBranch = branch2Name
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mode = aMode
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sha = aSha
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conf = 'file/dir'
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else:
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addBranch = branch2Name
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otherBranch = branch1Name
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mode = bMode
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sha = bSha
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conf = 'dir/file'
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if path in dirs:
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cleanMerge = False
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newPath = uniquePath(path, addBranch)
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print 'CONFLICT (' + conf + \
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'): There is a directory with name "' + path + '" in', \
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otherBranch + '. Adding "' + path + '" as "' + newPath + '"'
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removeFile(False, path)
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path = newPath
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else:
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print 'Adding "' + path + '"'
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updateFile(True, sha, mode, path)
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elif not oSha and aSha and bSha:
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#
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# Case C: Added in both (check for same permissions).
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#
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if aSha == bSha:
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if aMode != bMode:
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cleanMerge = False
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print 'CONFLICT: File "' + path + \
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'" added identically in both branches,', \
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'but permissions conflict', '0%o' % aMode, '->', \
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'0%o' % bMode
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print 'CONFLICT: adding with permission:', '0%o' % aMode
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updateFile(False, aSha, aMode, path)
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else:
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# This case is handled by git-read-tree
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assert(False)
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else:
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cleanMerge = False
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newPath1 = uniquePath(path, branch1Name)
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newPath2 = uniquePath(path, branch2Name)
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print 'CONFLICT (add/add): File "' + path + \
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'" added non-identically in both branches.'
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removeFile(False, path)
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updateFile(False, aSha, aMode, newPath1)
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updateFile(False, bSha, bMode, newPath2)
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elif oSha and aSha and bSha:
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#
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# case D: Modified in both, but differently.
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#
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print 'Auto-merging', path
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orig = runProgram(['git-unpack-file', oSha]).rstrip()
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src1 = runProgram(['git-unpack-file', aSha]).rstrip()
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src2 = runProgram(['git-unpack-file', bSha]).rstrip()
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[out, ret] = runProgram(['merge',
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'-L', branch1Name + '/' + path,
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'-L', 'orig/' + path,
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'-L', branch2Name + '/' + path,
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src1, orig, src2], returnCode=True)
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if aMode == oMode:
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mode = bMode
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else:
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mode = aMode
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sha = runProgram(['git-hash-object', '-t', 'blob', '-w',
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src1]).rstrip()
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if ret != 0:
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cleanMerge = False
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print 'CONFLICT (content): Merge conflict in "' + path + '".'
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if cleanCache:
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updateFile(False, sha, mode, path)
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else:
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updateFile(True, aSha, aMode, path)
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updateFile(False, sha, mode, path, True)
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else:
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updateFile(True, sha, mode, path)
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os.unlink(orig)
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os.unlink(src1)
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os.unlink(src2)
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else:
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die("ERROR: Fatal merge failure, shouldn't happen.")
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return cleanMerge
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def usage():
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die('Usage:', sys.argv[0], ' <base>... -- <head> <remote>..')
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# main entry point as merge strategy module
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# The first parameters up to -- are merge bases, and the rest are heads.
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# This strategy module figures out merge bases itself, so we only
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# get heads.
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if len(sys.argv) < 4:
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usage()
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for nextArg in xrange(1, len(sys.argv)):
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if sys.argv[nextArg] == '--':
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if len(sys.argv) != nextArg + 3:
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die('Not handling anything other than two heads merge.')
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try:
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h1 = firstBranch = sys.argv[nextArg + 1]
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h2 = secondBranch = sys.argv[nextArg + 2]
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except IndexError:
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usage()
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break
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print 'Merging', h1, 'with', h2
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try:
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h1 = runProgram(['git-rev-parse', '--verify', h1 + '^0']).rstrip()
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h2 = runProgram(['git-rev-parse', '--verify', h2 + '^0']).rstrip()
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graph = buildGraph([h1, h2])
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[res, clean] = merge(graph.shaMap[h1], graph.shaMap[h2],
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firstBranch, secondBranch, graph)
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print ''
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except:
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traceback.print_exc(None, sys.stderr)
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sys.exit(2)
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if clean:
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sys.exit(0)
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else:
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sys.exit(1)
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