Mercurial > hg
view contrib/convert-repo @ 3416:145a8fde69e6
Update branch on checkout/update
author | Matt Mackall <mpm@selenic.com> |
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date | Tue, 17 Oct 2006 18:30:20 -0500 |
parents | e6a7a6a33a62 |
children | 158fce02dc40 |
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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, time from mercurial import hg, ui, util class convert_git: def __init__(self, path): self.path = path def getheads(self): fh = os.popen("GIT_DIR=%s git-rev-parse --verify HEAD" % self.path) return [fh.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()