Mercurial > hg
view contrib/convert-repo @ 338:1e091b3293d5
default path support with .hg/hgrc
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default path support with .hg/hgrc
hg init creates a new .hgrc file containing a default path pointing to
where we pulled from. hg pull now uses "default" as the default source.
manifest hash: 0908e3b0648f92a63a3b58e49107cedf07ca0fb4
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author | mpm@selenic.com |
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date | Tue, 14 Jun 2005 18:37:53 -0800 |
parents | c48d069163d6 |
children | dfc44f3f587c |
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#!/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 from mercurial import hg, ui class convert_git: def __init__(self, path): self.path = path def getheads(self): h = file(self.path + "/.git/HEAD").read()[:-1] return [h] def getfile(self, name, rev): a = file(self.path + ("/.git/objects/%s/%s" % (rev[:2], rev[2:]))).read() b = zlib.decompress(a) if sha.sha(b).hexdigest() != rev: raise "bad hash" head, text = b.split('\0', 1) return text def getchanges(self, version): path = os.getcwd() os.chdir(self.path) fh = os.popen("git-diff-tree -m -r %s" % (version)) os.chdir(path) 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.getfile("", version) # 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() date = " ".join(p[-2:]) author = " ".join(p[:-2]) if author[0] == "<": author = author[1:-1] if n == "parent": parents.append(v) return (parents, author, date, message) 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 def putfile(self, f, e, data): self.repo.wfile(f, "w").write(data) hg.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): p1, p2 = "0"*40, "0"*40 if len(parents) > 0: p1 = parents[0] if len(parents) > 1: p2 = parents[1] if len(parents) > 2: raise "the dreaded octopus merge!" self.repo.rawcommit(files, text, author, dest, hg.bin(p1), hg.bin(p2)) 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 = {} 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 = {} 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 = parents.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) 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) gitpath, hgpath, mapfile = sys.argv[1:] c = convert(convert_git(gitpath), convert_mercurial(hgpath), mapfile) c.convert()