contrib/convert-repo
author mpm@selenic.com
Sun, 12 Jun 2005 08:51:11 -0800
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child 431 dfc44f3f587c
permissions -rwxr-xr-x
Add new convert-repo script -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Add new convert-repo script This is the beginnings of a generalized framework for converting repositories. Currently hardwired to convert from git to hg. manifest hash: dc3b72de2c45bfdaffcc1cf71da530228793facd -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.0 (GNU/Linux) iD8DBQFCrGf/ywK+sNU5EO8RAi9EAJ0eQ++cwSgn5j2PHiTvF7r3JNiv4gCePY+X do12pUvCczyBKVCoBN7y/uI= =YtzI -----END PGP SIGNATURE-----
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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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# In its current form, it's hardcoded to convert incrementally between
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# git and Mercurial.
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#
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# To use, you must first import the first git version into Mercurial,
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# and establish a mapping between the git commit hash and the hash in
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# Mercurial for that version. This mapping is kept in a simple text
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# file with lines like so:
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#
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# <git hash> <mercurial hash>
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#
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# To convert the rest of the repo, run:
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#
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# convert-repo <git-dir> <hg-dir> <mapfile>
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#
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# This updates the mapfile on each commit copied, so it can be
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# interrupted and can be run repeatedly to copy new commits.
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import sys, os, zlib, sha
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from mercurial import hg, ui
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class convert_git:
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    def __init__(self, path):
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        self.path = path
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    def getheads(self):
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        h = file(self.path + "/.git/HEAD").read()[:-1]
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        return [h]
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    def getfile(self, name, rev):
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        a = file(self.path + ("/.git/objects/%s/%s"
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                              % (rev[:2], rev[2:]))).read()
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        b = zlib.decompress(a)
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        if sha.sha(b).hexdigest() != rev: raise "bad hash"
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        head, text = b.split('\0', 1)
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        return text
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    def getchanges(self, version):
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        path = os.getcwd()
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        os.chdir(self.path)
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        fh = os.popen("git-diff-tree -m -r %s" % (version))
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        os.chdir(path)
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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.getfile("", version) # 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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        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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                date = " ".join(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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            if n == "parent": parents.append(v)
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        return (parents, author, date, message)
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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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        self.repo = hg.repository(u, path)
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    def getheads(self):
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        h = self.repo.changelog.heads()
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        h = [ hg.hex(x) for x in h ]
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        return 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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        hg.set_exec(self.repo.wjoin(f), e)
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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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        p1, p2 = "0"*40, "0"*40
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        if len(parents) > 0: p1 = parents[0]
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        if len(parents) > 1: p2 = parents[1]
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        if len(parents) > 2: raise "the dreaded octopus merge!"
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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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        return hg.hex(self.repo.changelog.tip())
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class convert:
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    def __init__(self, source, dest, mapfile):
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        self.source = source
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        self.dest = dest
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        self.mapfile = mapfile
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        self.commitcache = {}
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        self.map = {}
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        for l in file(self.mapfile):
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            sv, dv = l[:-1].split()
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            self.map[sv] = dv
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    def walktree(self, heads):
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        visit = heads
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        known = {}
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        parents = {}
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        while visit:
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            n = visit.pop(0)
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            if n in known or n in self.map: continue
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            known[n] = 1
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            self.commitcache[n] = self.source.getcommit(n)
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            cp = self.commitcache[n][0]
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            for p in cp:
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                parents.setdefault(n, []).append(p)
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                visit.append(p)
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        return parents
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    def toposort(self, parents):
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        visit = parents.keys()
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        seen = {}
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        children = {}
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        while visit:
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            n = visit.pop(0)
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            if n in seen: continue
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            seen[n] = 1
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            pc = 0
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            if n in parents:
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                for p in parents[n]:
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                    if p not in self.map: pc += 1
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                    visit.append(p)
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                    children.setdefault(p, []).append(n)
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            if not pc: root = n
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        s = []
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        removed = {}
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        visit = parents.keys()
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        while visit:
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            n = visit.pop(0)
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            if n in removed: continue
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            dep = 0
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            if n in parents:
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                for p in parents[n]:
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                    if p in self.map: continue
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                    if p not in removed:
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                        # we're still dependent
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                        visit.append(n)
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                        dep = 1
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                        break
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            if not dep:
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                # all n's parents are in the list
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                removed[n] = 1
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                s.append(n)
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                if n in children:
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                    for c in children[n]:
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                        visit.insert(0, c)
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        return s
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    def copy(self, rev):
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        p, a, d, t = self.commitcache[rev]
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        files = self.source.getchanges(rev)
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        for f,v,e in files:
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            try:
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                data = self.source.getfile(f, v)
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            except IOError, inst:
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                self.dest.delfile(f)
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            else:
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                self.dest.putfile(f, e, data)
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        r = [self.map[v] for v in p]
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        f = [f for f,v,e in files]
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        self.map[rev] = self.dest.putcommit(f, r, a, d, t)
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        file(self.mapfile, "a").write("%s %s\n" % (rev, self.map[rev]))
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    def convert(self):
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        heads = self.source.getheads()
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        parents = self.walktree(heads)
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        t = self.toposort(parents)
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        num = len(t)
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        for c in t:
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            num -= 1
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            if c in self.map: continue
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            desc = self.commitcache[c][3].splitlines()[0]
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            print num, desc
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            self.copy(c)
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gitpath, hgpath, mapfile = sys.argv[1:]
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c = convert(convert_git(gitpath), convert_mercurial(hgpath), mapfile)
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c.convert()