Added ability to clone from a local repository to a (new) remote one.
Rearranged the clone command a good bit to make sure it validates that
the source does exist and that the destination doesn't before doing anything.
Before I moved the source repo check it would create the destination
repository before it verified the source existed.
Moved the responsibility for creating the destination repo root directory
entirly into the localrepo class so that local to local cloning doesn't break.
This also simplifies the code a bit since it's no longer being done in both
clone and init.
Changed the names of the 'repo' and 'other' variables to 'dest_repo' and
'src_repo' to maintain my sanity.
Passes 82/83 tests. The only failure is the version number test, which I
suspect is supposed to fail since it comes from a generated file.
#!/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.
import sys, os, zlib, sha, time
from mercurial import hg, ui, util
class convert_git:
def __init__(self, path):
self.path = path
def getheads(self):
return [file(self.path + "/HEAD").read()[:-1]]
def catfile(self, rev, type):
if rev == "0" * 40: raise IOError()
fh = os.popen("GIT_DIR=%s git-cat-file %s %s 2>/dev/null" % (self.path, type, rev))
return fh.read()
def getfile(self, name, rev):
return self.catfile(rev, "blob")
def getchanges(self, version):
fh = os.popen("GIT_DIR=%s git-diff-tree --root -m -r %s" % (self.path, version))
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):
c = self.catfile(version, "commit") # read the commit hash
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()
tm, tz = p[-2:]
author = " ".join(p[:-2])
if author[0] == "<": author = author[1:-1]
if n == "committer":
p = v.split()
tm, tz = p[-2:]
committer = " ".join(p[:-2])
if committer[0] == "<": committer = committer[1:-1]
message += "\ncommitter: %s\n" % v
if n == "parent": parents.append(v)
tzs, tzh, tzm = tz[-5:-4] + "1", tz[-4:-2], tz[-2:]
tz = -int(tzs) * (int(tzh) * 3600 + int(tzm))
date = tm + " " + str(tz)
return (parents, author, date, message)
def gettags(self):
tags = {}
for f in os.listdir(self.path + "/refs/tags"):
try:
h = file(self.path + "/refs/tags/" + f).read().strip()
c = self.catfile(h, "tag") # read the commit hash
h = c.splitlines()[0].split()[1]
tags[f] = h
except:
pass
return tags
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()
return [ hg.hex(x) for x in h ]
def putfile(self, f, e, data):
self.repo.wfile(f, "w").write(data)
if self.repo.dirstate.state(f) == '?':
self.repo.dirstate.update([f], "a")
util.set_exec(self.repo.wjoin(f), e)
def delfile(self, f):
try:
os.unlink(self.repo.wjoin(f))
#self.repo.remove([f])
except:
pass
def putcommit(self, files, parents, author, dest, text):
seen = {}
pl = []
for p in parents:
if p not in seen:
pl.append(p)
seen[p] = 1
parents = pl
if len(parents) < 2: parents.append("0" * 40)
if len(parents) < 2: parents.append("0" * 40)
p2 = parents.pop(0)
while parents:
p1 = p2
p2 = parents.pop(0)
self.repo.rawcommit(files, text, author, dest,
hg.bin(p1), hg.bin(p2))
text = "(octopus merge fixup)\n"
p2 = hg.hex(self.repo.changelog.tip())
return p2
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" % int(time.mktime(time.gmtime()))
self.repo.rawcommit([".hgtags"], "update tags", "convert-repo",
date, self.repo.changelog.tip(), hg.nullid)
return hg.hex(self.repo.changelog.tip())
class convert:
def __init__(self, source, dest, mapfile):
self.source = source
self.dest = dest
self.mapfile = mapfile
self.commitcache = {}
self.map = {}
try:
for l in file(self.mapfile):
sv, dv = l[:-1].split()
self.map[sv] = dv
except IOError:
pass
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 = {}
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 = {}
visit = children.keys()
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)
t = [n for n in t if n not in self.map]
num = len(t)
c = None
for c in t:
num -= 1
desc = self.commitcache[c][3].splitlines()[0]
#print num, desc
self.copy(c)
tags = self.source.gettags()
ctags = {}
for k in tags:
v = tags[k]
if v in self.map:
ctags[k] = self.map[v]
if c and ctags:
nrev = self.dest.puttags(ctags)
# write another hash correspondence to override the previous
# one so we don't end up with extra tag heads
file(self.mapfile, "a").write("%s %s\n" % (c, nrev))
gitpath, hgpath, mapfile = sys.argv[1:]
if os.path.isdir(gitpath + "/.git"):
gitpath += "/.git"
c = convert(convert_git(gitpath), convert_mercurial(hgpath), mapfile)
c.convert()