contrib/convert-repo
author Matt Mackall <mpm@selenic.com>
Wed, 20 Dec 2006 17:04:07 -0600
changeset 3939 b58c1681d23b
parent 3938 0fab73b3f453
child 3953 fad134931327
permissions -rwxr-xr-x
Update convert-repo usage comments
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#!/usr/bin/env python
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#
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# This is a generalized framework for converting between SCM
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# repository formats.
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#
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# To use, run:
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#
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# convert-repo <source> [<dest> [<mapfile>]]
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#
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# Currently accepted source formats: git
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# Currently accepted destination formats: hg
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#
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# If destination isn't given, a new Mercurial repo named <src>-hg will
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# be created. If <mapfile> isn't given, it will be put in a default
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# location (<dest>/.hg/shamap by default)
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#
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# The <mapfile> is a simple text file that maps each source commit ID to
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# the destination ID for that revision, like so:
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#
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# <source ID> <destination ID>
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#
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# If the file doesn't exist, it's automatically created.  It's updated
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# on each commit copied, so convert-repo can be interrupted and can
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# be run repeatedly to copy new commits.
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import sys, os, zlib, sha, time
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os.environ["HGENCODING"] = "utf-8"
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from mercurial import hg, ui, util, fancyopts
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class Abort(Exception): pass
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quiet = 0
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def status(msg):
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    if not quiet: sys.stdout.write(str(msg))
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def warn(msg):
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    sys.stderr.write(str(msg))
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def abort(msg):
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    raise Abort(msg)
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def recode(s):
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    try:
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        return s.decode("utf-8").encode("utf-8")
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    except:
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        try:
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            return s.decode("latin-1").encode("utf-8")
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        except:
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            return s.decode("utf-8", "replace").encode("utf-8")
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class convert_git:
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    def __init__(self, path):
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        if os.path.isdir(path + "/.git"):
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            path += "/.git"
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        self.path = path
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        if not os.path.exists(path + "/HEAD"):
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            raise TypeError("couldn't open GIT repo %s" % path)
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    def getheads(self):
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        fh = os.popen("GIT_DIR=%s git-rev-parse --verify HEAD" % self.path)
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        return [fh.read()[:-1]]
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    def catfile(self, rev, type):
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        if rev == "0" * 40: raise IOError()
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        fh = os.popen("GIT_DIR=%s git-cat-file %s %s 2>/dev/null" % (self.path, type, rev))
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        return fh.read()
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    def getfile(self, name, rev):
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        return self.catfile(rev, "blob")
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    def getchanges(self, version):
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        fh = os.popen("GIT_DIR=%s git-diff-tree --root -m -r %s" % (self.path, version))
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        changes = []
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        for l in fh:
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            if "\t" not in l: continue
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            m, f = l[:-1].split("\t")
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            m = m.split()
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            h = m[3]
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            p = (m[1] == "100755")
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            changes.append((f, h, p))
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        return changes
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    def getcommit(self, version):
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        c = self.catfile(version, "commit") # read the commit hash
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        end = c.find("\n\n")
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        message = c[end+2:]
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        message = recode(message)
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        l = c[:end].splitlines()
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        manifest = l[0].split()[1]
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        parents = []
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        for e in l[1:]:
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            n,v = e.split(" ", 1)
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            if n == "author":
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                p = v.split()
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                tm, tz = p[-2:]
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                author = " ".join(p[:-2])
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                if author[0] == "<": author = author[1:-1]
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                author = recode(author)
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            if n == "committer":
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                p = v.split()
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                tm, tz = p[-2:]
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                committer = " ".join(p[:-2])
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                if committer[0] == "<": committer = committer[1:-1]
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                committer = recode(committer)
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                message += "\ncommitter: %s\n" % committer
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            if n == "parent": parents.append(v)
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        tzs, tzh, tzm = tz[-5:-4] + "1", tz[-4:-2], tz[-2:]
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        tz = -int(tzs) * (int(tzh) * 3600 + int(tzm))
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        date = tm + " " + str(tz)
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        return (parents, author, date, message)
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    def gettags(self):
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        tags = {}
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        for f in os.listdir(self.path + "/refs/tags"):
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            try:
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                h = file(self.path + "/refs/tags/" + f).read().strip()
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                c = self.catfile(h, "tag") # read the commit hash
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                h = c.splitlines()[0].split()[1]
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                tags[f] = h
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            except:
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                pass
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        return tags
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class convert_mercurial:
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    def __init__(self, path):
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        self.path = path
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        u = ui.ui()
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        try:
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            self.repo = hg.repository(u, path)
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        except:
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            raise TypeError("could open hg repo %s" % path)
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    def mapfile(self):
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        return os.path.join(self.path, ".hg", "shamap")
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    def getheads(self):
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        h = self.repo.changelog.heads()
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        return [ hg.hex(x) for x in h ]
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    def putfile(self, f, e, data):
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        self.repo.wfile(f, "w").write(data)
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        if self.repo.dirstate.state(f) == '?':
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            self.repo.dirstate.update([f], "a")
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        util.set_exec(self.repo.wjoin(f), e)
316
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    def delfile(self, f):
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        try:
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            os.unlink(self.repo.wjoin(f))
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            #self.repo.remove([f])
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        except:
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            pass
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    def putcommit(self, files, parents, author, dest, text):
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        seen = {}
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        pl = []
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        for p in parents:
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            if p not in seen:
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                pl.append(p)
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                seen[p] = 1
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        parents = pl
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        if len(parents) < 2: parents.append("0" * 40)
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   165
        if len(parents) < 2: parents.append("0" * 40)
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        p2 = parents.pop(0)
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   167
431
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   168
        while parents:
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   169
            p1 = p2
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            p2 = parents.pop(0)
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            self.repo.rawcommit(files, text, author, dest,
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                                hg.bin(p1), hg.bin(p2))
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            text = "(octopus merge fixup)\n"
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            p2 = hg.hex(self.repo.changelog.tip())
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        return p2
316
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    def puttags(self, tags):
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        try:
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            old = self.repo.wfile(".hgtags").read()
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            oldlines = old.splitlines(1)
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            oldlines.sort()
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        except:
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            oldlines = []
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   185
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        k = tags.keys()
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        k.sort()
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   188
        newlines = []
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   189
        for tag in k:
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            newlines.append("%s %s\n" % (tags[tag], tag))
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   191
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        newlines.sort()
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   193
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   194
        if newlines != oldlines:
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   195
            status("updating tags\n")
694
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            f = self.repo.wfile(".hgtags", "w")
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   197
            f.write("".join(newlines))
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            f.close()
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   199
            if not oldlines: self.repo.add([".hgtags"])
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bea6356b8bca git -> hg conversion script
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parents: 1237
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            date = "%s 0" % int(time.mktime(time.gmtime()))
694
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   201
            self.repo.rawcommit([".hgtags"], "update tags", "convert-repo",
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   202
                                date, self.repo.changelog.tip(), hg.nullid)
1387
0c7e8d345564 convert-repo: linearize the tag commit
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parents: 1386
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   203
            return hg.hex(self.repo.changelog.tip())
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   204
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   205
converters = [convert_git, convert_mercurial]
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   206
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   207
def converter(path):
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   208
    if not os.path.isdir(path):
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   209
        abort("%s: not a directory\n" % path)
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   210
    for c in converters:
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   211
        try:
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   212
            return c(path)
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   213
        except TypeError:
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   214
            pass
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   215
    abort("%s: unknown repository type\n" % path)
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   216
316
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   217
class convert:
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   218
    def __init__(self, source, dest, mapfile):
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   219
316
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        self.source = source
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   221
        self.dest = dest
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   222
        self.mapfile = mapfile
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   223
        self.commitcache = {}
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   224
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   225
        self.map = {}
1655
7bfd4724932a convert-repo: automatically create empty map file
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parents: 1389
diff changeset
   226
        try:
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   227
            for l in file(self.mapfile):
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diff changeset
   228
                sv, dv = l[:-1].split()
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   229
                self.map[sv] = dv
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   230
        except IOError:
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diff changeset
   231
            pass
316
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   232
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   233
    def walktree(self, heads):
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   234
        visit = heads
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   235
        known = {}
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   236
        parents = {}
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   237
        while visit:
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   238
            n = visit.pop(0)
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   239
            if n in known or n in self.map: continue
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   240
            known[n] = 1
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diff changeset
   241
            self.commitcache[n] = self.source.getcommit(n)
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diff changeset
   242
            cp = self.commitcache[n][0]
c48d069163d6 Add new convert-repo script
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parents:
diff changeset
   243
            for p in cp:
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diff changeset
   244
                parents.setdefault(n, []).append(p)
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   245
                visit.append(p)
c48d069163d6 Add new convert-repo script
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parents:
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   246
c48d069163d6 Add new convert-repo script
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parents:
diff changeset
   247
        return parents
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   248
c48d069163d6 Add new convert-repo script
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diff changeset
   249
    def toposort(self, parents):
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diff changeset
   250
        visit = parents.keys()
c48d069163d6 Add new convert-repo script
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diff changeset
   251
        seen = {}
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   252
        children = {}
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695dd9a491da convert-repo: deal with packed git and other fixes
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diff changeset
   253
316
c48d069163d6 Add new convert-repo script
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parents:
diff changeset
   254
        while visit:
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parents:
diff changeset
   255
            n = visit.pop(0)
c48d069163d6 Add new convert-repo script
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parents:
diff changeset
   256
            if n in seen: continue
c48d069163d6 Add new convert-repo script
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parents:
diff changeset
   257
            seen[n] = 1
c48d069163d6 Add new convert-repo script
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parents:
diff changeset
   258
            pc = 0
c48d069163d6 Add new convert-repo script
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parents:
diff changeset
   259
            if n in parents:
c48d069163d6 Add new convert-repo script
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parents:
diff changeset
   260
                for p in parents[n]:
c48d069163d6 Add new convert-repo script
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parents:
diff changeset
   261
                    if p not in self.map: pc += 1
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parents:
diff changeset
   262
                    visit.append(p)
c48d069163d6 Add new convert-repo script
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parents:
diff changeset
   263
                    children.setdefault(p, []).append(n)
c48d069163d6 Add new convert-repo script
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parents:
diff changeset
   264
            if not pc: root = n
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parents:
diff changeset
   265
c48d069163d6 Add new convert-repo script
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parents:
diff changeset
   266
        s = []
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diff changeset
   267
        removed = {}
692
695dd9a491da convert-repo: deal with packed git and other fixes
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parents: 450
diff changeset
   268
        visit = children.keys()
316
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parents:
diff changeset
   269
        while visit:
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parents:
diff changeset
   270
            n = visit.pop(0)
c48d069163d6 Add new convert-repo script
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parents:
diff changeset
   271
            if n in removed: continue
c48d069163d6 Add new convert-repo script
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parents:
diff changeset
   272
            dep = 0
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parents:
diff changeset
   273
            if n in parents:
c48d069163d6 Add new convert-repo script
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parents:
diff changeset
   274
                for p in parents[n]:
c48d069163d6 Add new convert-repo script
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parents:
diff changeset
   275
                    if p in self.map: continue
c48d069163d6 Add new convert-repo script
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parents:
diff changeset
   276
                    if p not in removed:
c48d069163d6 Add new convert-repo script
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parents:
diff changeset
   277
                        # we're still dependent
c48d069163d6 Add new convert-repo script
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diff changeset
   278
                        visit.append(n)
c48d069163d6 Add new convert-repo script
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parents:
diff changeset
   279
                        dep = 1
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parents:
diff changeset
   280
                        break
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parents:
diff changeset
   281
c48d069163d6 Add new convert-repo script
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parents:
diff changeset
   282
            if not dep:
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parents:
diff changeset
   283
                # all n's parents are in the list
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parents:
diff changeset
   284
                removed[n] = 1
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parents:
diff changeset
   285
                s.append(n)
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parents:
diff changeset
   286
                if n in children:
c48d069163d6 Add new convert-repo script
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parents:
diff changeset
   287
                    for c in children[n]:
c48d069163d6 Add new convert-repo script
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parents:
diff changeset
   288
                        visit.insert(0, c)
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parents:
diff changeset
   289
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parents:
diff changeset
   290
        return s
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parents:
diff changeset
   291
c48d069163d6 Add new convert-repo script
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diff changeset
   292
    def copy(self, rev):
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parents:
diff changeset
   293
        p, a, d, t = self.commitcache[rev]
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parents:
diff changeset
   294
        files = self.source.getchanges(rev)
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parents:
diff changeset
   295
c48d069163d6 Add new convert-repo script
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parents:
diff changeset
   296
        for f,v,e in files:
c48d069163d6 Add new convert-repo script
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parents:
diff changeset
   297
            try:
c48d069163d6 Add new convert-repo script
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parents:
diff changeset
   298
                data = self.source.getfile(f, v)
c48d069163d6 Add new convert-repo script
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parents:
diff changeset
   299
            except IOError, inst:
c48d069163d6 Add new convert-repo script
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parents:
diff changeset
   300
                self.dest.delfile(f)
c48d069163d6 Add new convert-repo script
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parents:
diff changeset
   301
            else:
c48d069163d6 Add new convert-repo script
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parents:
diff changeset
   302
                self.dest.putfile(f, e, data)
c48d069163d6 Add new convert-repo script
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parents:
diff changeset
   303
c48d069163d6 Add new convert-repo script
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parents:
diff changeset
   304
        r = [self.map[v] for v in p]
c48d069163d6 Add new convert-repo script
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parents:
diff changeset
   305
        f = [f for f,v,e in files]
c48d069163d6 Add new convert-repo script
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parents:
diff changeset
   306
        self.map[rev] = self.dest.putcommit(f, r, a, d, t)
c48d069163d6 Add new convert-repo script
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parents:
diff changeset
   307
        file(self.mapfile, "a").write("%s %s\n" % (rev, self.map[rev]))
c48d069163d6 Add new convert-repo script
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parents:
diff changeset
   308
c48d069163d6 Add new convert-repo script
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parents:
diff changeset
   309
    def convert(self):
3938
0fab73b3f453 convert-repo: add some smarts
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parents: 3917
diff changeset
   310
        status("scanning source...\n")
316
c48d069163d6 Add new convert-repo script
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parents:
diff changeset
   311
        heads = self.source.getheads()
c48d069163d6 Add new convert-repo script
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        parents = self.walktree(heads)
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        status("sorting...\n")
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        t = self.toposort(parents)
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        t = [n for n in t if n not in self.map]
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        num = len(t)
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        c = None
316
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        status("converting...\n")
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        for c in t:
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            num -= 1
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            desc = self.commitcache[c][3].splitlines()[0]
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            status("%d %s\n" % (num, desc))
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            self.copy(c)
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        tags = self.source.gettags()
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        ctags = {}
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        for k in tags:
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            v = tags[k]
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            if v in self.map:
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                ctags[k] = self.map[v]
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        if c and ctags:
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            nrev = self.dest.puttags(ctags)
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            # write another hash correspondence to override the previous
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            # one so we don't end up with extra tag heads
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            if nrev:
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                file(self.mapfile, "a").write("%s %s\n" % (c, nrev))
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def command(src, dest=None, mapfile=None, **opts):
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    srcc = converter(src)
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    if not hasattr(srcc, "getcommit"):
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        abort("%s: can't read from this repo type\n" % src)
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    if not dest:
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        dest = src + "-hg"
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        status("assuming destination %s\n" % dest)
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        if not os.path.isdir(dest):
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            status("creating repository %s\n" % dest)
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            os.system("hg init " + dest)
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    destc = converter(dest)
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    if not hasattr(destc, "putcommit"):
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        abort("%s: can't write to this repo type\n" % src)
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    if not mapfile:
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        try:
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            mapfile = destc.mapfile()
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        except:
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            mapfile = os.path.join(destc, "map")
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    c = convert(srcc, destc, mapfile)
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    c.convert()
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   363
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options = [('q', 'quiet', None, 'suppress output')]
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opts = {}
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args = fancyopts.fancyopts(sys.argv[1:], options, opts)
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if opts['quiet']:
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    quiet = 1
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   370
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   371
try:
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   372
    command(*args, **opts)
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   373
except Abort, inst:
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   374
    warn(inst)
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   375
except KeyboardInterrupt:
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   376
    status("interrupted\n")