convert-repo
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r316 | #!/usr/bin/env python | ||
# | ||||
# This is a generalized framework for converting between SCM | ||||
# repository formats. | ||||
# | ||||
# In its current form, it's hardcoded to convert incrementally between | ||||
# git and Mercurial. | ||||
# | ||||
# To use, you must first import the first git version into Mercurial, | ||||
# and establish a mapping between the git commit hash and the hash in | ||||
# Mercurial for that version. This mapping is kept in a simple text | ||||
# file with lines like so: | ||||
# | ||||
# <git hash> <mercurial hash> | ||||
# | ||||
# To convert the rest of the repo, run: | ||||
# | ||||
# convert-repo <git-dir> <hg-dir> <mapfile> | ||||
# | ||||
# This updates the mapfile on each commit copied, so it can be | ||||
# interrupted and can be run repeatedly to copy new commits. | ||||
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r694 | import sys, os, zlib, sha, time | ||
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r450 | from mercurial import hg, ui, util | ||
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r316 | |||
class convert_git: | ||||
def __init__(self, path): | ||||
self.path = path | ||||
def getheads(self): | ||||
h = file(self.path + "/.git/HEAD").read()[:-1] | ||||
return [h] | ||||
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r692 | def catfile(self, rev, type): | ||
if rev == "0" * 40: raise IOError() | ||||
path = os.getcwd() | ||||
os.chdir(self.path) | ||||
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r694 | fh = os.popen("git-cat-file %s %s 2>/dev/null" % (type, rev)) | ||
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r692 | os.chdir(path) | ||
return fh.read() | ||||
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r316 | def getfile(self, name, rev): | ||
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r692 | return self.catfile(rev, "blob") | ||
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r316 | |||
def getchanges(self, version): | ||||
path = os.getcwd() | ||||
os.chdir(self.path) | ||||
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r692 | fh = os.popen("git-diff-tree --root -m -r %s" % (version)) | ||
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r316 | os.chdir(path) | ||
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r692 | |||
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r316 | changes = [] | ||
for l in fh: | ||||
if "\t" not in l: continue | ||||
m, f = l[:-1].split("\t") | ||||
m = m.split() | ||||
h = m[3] | ||||
p = (m[1] == "100755") | ||||
changes.append((f, h, p)) | ||||
return changes | ||||
def getcommit(self, version): | ||||
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r692 | c = self.catfile(version, "commit") # read the commit hash | ||
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r316 | end = c.find("\n\n") | ||
message = c[end+2:] | ||||
l = c[:end].splitlines() | ||||
manifest = l[0].split()[1] | ||||
parents = [] | ||||
for e in l[1:]: | ||||
n,v = e.split(" ", 1) | ||||
if n == "author": | ||||
p = v.split() | ||||
date = " ".join(p[-2:]) | ||||
author = " ".join(p[:-2]) | ||||
if author[0] == "<": author = author[1:-1] | ||||
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r692 | if n == "committer": | ||
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r431 | p = v.split() | ||
date = " ".join(p[-2:]) | ||||
committer = " ".join(p[:-2]) | ||||
if committer[0] == "<": committer = committer[1:-1] | ||||
message += "\ncommitter: %s %s\n" % (committer, date) | ||||
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r316 | if n == "parent": parents.append(v) | ||
return (parents, author, date, message) | ||||
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r694 | def gettags(self): | ||
tags = {} | ||||
for f in os.listdir(self.path + "/.git/refs/tags"): | ||||
try: | ||||
h = file(self.path + "/.git/refs/tags/" + f).read().strip() | ||||
p, a, d, m = self.getcommit(h) | ||||
if not p: p = [h] # git is ugly, don't blame me | ||||
tags[f] = p[0] | ||||
except: | ||||
pass | ||||
return tags | ||||
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r316 | class convert_mercurial: | ||
def __init__(self, path): | ||||
self.path = path | ||||
u = ui.ui() | ||||
self.repo = hg.repository(u, path) | ||||
def getheads(self): | ||||
h = self.repo.changelog.heads() | ||||
h = [ hg.hex(x) for x in h ] | ||||
return h | ||||
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r692 | |||
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r316 | def putfile(self, f, e, data): | ||
self.repo.wfile(f, "w").write(data) | ||||
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r692 | if self.repo.dirstate.state(f) == '?': | ||
self.repo.dirstate.update([f], "a") | ||||
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r450 | util.set_exec(self.repo.wjoin(f), e) | ||
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r316 | |||
def delfile(self, f): | ||||
try: | ||||
os.unlink(self.repo.wjoin(f)) | ||||
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r692 | #self.repo.remove([f]) | ||
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r316 | except: | ||
pass | ||||
def putcommit(self, files, parents, author, dest, text): | ||||
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r431 | seen = {} | ||
pl = [] | ||||
for p in parents: | ||||
if p not in seen: | ||||
pl.append(p) | ||||
seen[p] = 1 | ||||
parents = pl | ||||
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r316 | |||
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r692 | if len(parents) < 2: parents.append("0" * 40) | ||
if len(parents) < 2: parents.append("0" * 40) | ||||
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r431 | p2 = parents.pop(0) | ||
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r692 | |||
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r431 | while parents: | ||
p1 = p2 | ||||
p2 = parents.pop(0) | ||||
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r692 | self.repo.rawcommit(files, text, author, dest, | ||
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r431 | hg.bin(p1), hg.bin(p2)) | ||
text = "(octopus merge fixup)\n" | ||||
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r692 | return hg.hex(self.repo.changelog.tip()) | ||
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r316 | |||
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r694 | def puttags(self, tags): | ||
try: | ||||
old = self.repo.wfile(".hgtags").read() | ||||
oldlines = old.splitlines(1) | ||||
oldlines.sort() | ||||
except: | ||||
oldlines = [] | ||||
k = tags.keys() | ||||
k.sort() | ||||
newlines = [] | ||||
for tag in k: | ||||
newlines.append("%s %s\n" % (tags[tag], tag)) | ||||
newlines.sort() | ||||
if newlines != oldlines: | ||||
print "updating tags" | ||||
f = self.repo.wfile(".hgtags", "w") | ||||
f.write("".join(newlines)) | ||||
f.close() | ||||
if not oldlines: self.repo.add([".hgtags"]) | ||||
date = "%s 0" % time.mktime(time.gmtime()) | ||||
self.repo.rawcommit([".hgtags"], "update tags", "convert-repo", | ||||
date, self.repo.changelog.tip(), hg.nullid) | ||||
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r316 | class convert: | ||
def __init__(self, source, dest, mapfile): | ||||
self.source = source | ||||
self.dest = dest | ||||
self.mapfile = mapfile | ||||
self.commitcache = {} | ||||
self.map = {} | ||||
for l in file(self.mapfile): | ||||
sv, dv = l[:-1].split() | ||||
self.map[sv] = dv | ||||
def walktree(self, heads): | ||||
visit = heads | ||||
known = {} | ||||
parents = {} | ||||
while visit: | ||||
n = visit.pop(0) | ||||
if n in known or n in self.map: continue | ||||
known[n] = 1 | ||||
self.commitcache[n] = self.source.getcommit(n) | ||||
cp = self.commitcache[n][0] | ||||
for p in cp: | ||||
parents.setdefault(n, []).append(p) | ||||
visit.append(p) | ||||
return parents | ||||
def toposort(self, parents): | ||||
visit = parents.keys() | ||||
seen = {} | ||||
children = {} | ||||
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r692 | |||
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r316 | while visit: | ||
n = visit.pop(0) | ||||
if n in seen: continue | ||||
seen[n] = 1 | ||||
pc = 0 | ||||
if n in parents: | ||||
for p in parents[n]: | ||||
if p not in self.map: pc += 1 | ||||
visit.append(p) | ||||
children.setdefault(p, []).append(n) | ||||
if not pc: root = n | ||||
s = [] | ||||
removed = {} | ||||
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r692 | visit = children.keys() | ||
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r316 | while visit: | ||
n = visit.pop(0) | ||||
if n in removed: continue | ||||
dep = 0 | ||||
if n in parents: | ||||
for p in parents[n]: | ||||
if p in self.map: continue | ||||
if p not in removed: | ||||
# we're still dependent | ||||
visit.append(n) | ||||
dep = 1 | ||||
break | ||||
if not dep: | ||||
# all n's parents are in the list | ||||
removed[n] = 1 | ||||
s.append(n) | ||||
if n in children: | ||||
for c in children[n]: | ||||
visit.insert(0, c) | ||||
return s | ||||
def copy(self, rev): | ||||
p, a, d, t = self.commitcache[rev] | ||||
files = self.source.getchanges(rev) | ||||
for f,v,e in files: | ||||
try: | ||||
data = self.source.getfile(f, v) | ||||
except IOError, inst: | ||||
self.dest.delfile(f) | ||||
else: | ||||
self.dest.putfile(f, e, data) | ||||
r = [self.map[v] for v in p] | ||||
f = [f for f,v,e in files] | ||||
self.map[rev] = self.dest.putcommit(f, r, a, d, t) | ||||
file(self.mapfile, "a").write("%s %s\n" % (rev, self.map[rev])) | ||||
def convert(self): | ||||
heads = self.source.getheads() | ||||
parents = self.walktree(heads) | ||||
t = self.toposort(parents) | ||||
num = len(t) | ||||
for c in t: | ||||
num -= 1 | ||||
if c in self.map: continue | ||||
desc = self.commitcache[c][3].splitlines()[0] | ||||
print num, desc | ||||
self.copy(c) | ||||
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r694 | tags = self.source.gettags() | ||
ctags = {} | ||||
for k in tags: | ||||
v = tags[k] | ||||
if v in self.map: | ||||
ctags[k] = self.map[v] | ||||
self.dest.puttags(ctags) | ||||
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r316 | gitpath, hgpath, mapfile = sys.argv[1:] | ||
c = convert(convert_git(gitpath), convert_mercurial(hgpath), mapfile) | ||||
c.convert() | ||||