author | Thomas Arendsen Hein <thomas@intevation.de> |
Sun, 08 Oct 2006 10:55:11 +0200 | |
changeset 3289 | 48ae77d1e083 |
parent 2649 | e6a7a6a33a62 |
child 3825 | 158fce02dc40 |
permissions | -rwxr-xr-x |
316 | 1 |
#!/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, time |
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from mercurial import hg, ui, util |
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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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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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316 | 39 |
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)) |
316 | 44 |
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 |
316 | 56 |
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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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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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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message += "\ncommitter: %s\n" % v |
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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) |
316 | 79 |
return (parents, author, date, message) |
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694 | 81 |
def gettags(self): |
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tags = {} |
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for f in os.listdir(self.path + "/refs/tags"): |
694 | 84 |
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 |
694 | 89 |
except: |
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pass |
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return tags |
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316 | 93 |
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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return [ hg.hex(x) for x in h ] |
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316 | 103 |
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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450 | 108 |
util.set_exec(self.repo.wjoin(f), e) |
316 | 109 |
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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]) |
316 | 114 |
except: |
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pass |
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def putcommit(self, files, parents, author, dest, text): |
431 | 118 |
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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if len(parents) < 2: parents.append("0" * 40) |
431 | 128 |
p2 = parents.pop(0) |
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431 | 130 |
while parents: |
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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)) |
431 | 135 |
text = "(octopus merge fixup)\n" |
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p2 = hg.hex(self.repo.changelog.tip()) |
431 | 137 |
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return p2 |
316 | 139 |
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694 | 140 |
def puttags(self, tags): |
141 |
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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148 |
k = tags.keys() |
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k.sort() |
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newlines = [] |
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for tag in k: |
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newlines.append("%s %s\n" % (tags[tag], tag)) |
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153 |
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newlines.sort() |
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155 |
||
156 |
if newlines != oldlines: |
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#print "updating tags" |
694 | 158 |
f = self.repo.wfile(".hgtags", "w") |
159 |
f.write("".join(newlines)) |
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f.close() |
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if not oldlines: self.repo.add([".hgtags"]) |
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date = "%s 0" % int(time.mktime(time.gmtime())) |
694 | 163 |
self.repo.rawcommit([".hgtags"], "update tags", "convert-repo", |
164 |
date, self.repo.changelog.tip(), hg.nullid) |
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return hg.hex(self.repo.changelog.tip()) |
694 | 166 |
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316 | 167 |
class convert: |
168 |
def __init__(self, source, dest, mapfile): |
|
169 |
self.source = source |
|
170 |
self.dest = dest |
|
171 |
self.mapfile = mapfile |
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172 |
self.commitcache = {} |
|
173 |
||
174 |
self.map = {} |
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175 |
try: |
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for l in file(self.mapfile): |
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177 |
sv, dv = l[:-1].split() |
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self.map[sv] = dv |
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179 |
except IOError: |
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180 |
pass |
316 | 181 |
|
182 |
def walktree(self, heads): |
|
183 |
visit = heads |
|
184 |
known = {} |
|
185 |
parents = {} |
|
186 |
while visit: |
|
187 |
n = visit.pop(0) |
|
188 |
if n in known or n in self.map: continue |
|
189 |
known[n] = 1 |
|
190 |
self.commitcache[n] = self.source.getcommit(n) |
|
191 |
cp = self.commitcache[n][0] |
|
192 |
for p in cp: |
|
193 |
parents.setdefault(n, []).append(p) |
|
194 |
visit.append(p) |
|
195 |
||
196 |
return parents |
|
197 |
||
198 |
def toposort(self, parents): |
|
199 |
visit = parents.keys() |
|
200 |
seen = {} |
|
201 |
children = {} |
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|
316 | 203 |
while visit: |
204 |
n = visit.pop(0) |
|
205 |
if n in seen: continue |
|
206 |
seen[n] = 1 |
|
207 |
pc = 0 |
|
208 |
if n in parents: |
|
209 |
for p in parents[n]: |
|
210 |
if p not in self.map: pc += 1 |
|
211 |
visit.append(p) |
|
212 |
children.setdefault(p, []).append(n) |
|
213 |
if not pc: root = n |
|
214 |
||
215 |
s = [] |
|
216 |
removed = {} |
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217 |
visit = children.keys() |
316 | 218 |
while visit: |
219 |
n = visit.pop(0) |
|
220 |
if n in removed: continue |
|
221 |
dep = 0 |
|
222 |
if n in parents: |
|
223 |
for p in parents[n]: |
|
224 |
if p in self.map: continue |
|
225 |
if p not in removed: |
|
226 |
# we're still dependent |
|
227 |
visit.append(n) |
|
228 |
dep = 1 |
|
229 |
break |
|
230 |
||
231 |
if not dep: |
|
232 |
# all n's parents are in the list |
|
233 |
removed[n] = 1 |
|
234 |
s.append(n) |
|
235 |
if n in children: |
|
236 |
for c in children[n]: |
|
237 |
visit.insert(0, c) |
|
238 |
||
239 |
return s |
|
240 |
||
241 |
def copy(self, rev): |
|
242 |
p, a, d, t = self.commitcache[rev] |
|
243 |
files = self.source.getchanges(rev) |
|
244 |
||
245 |
for f,v,e in files: |
|
246 |
try: |
|
247 |
data = self.source.getfile(f, v) |
|
248 |
except IOError, inst: |
|
249 |
self.dest.delfile(f) |
|
250 |
else: |
|
251 |
self.dest.putfile(f, e, data) |
|
252 |
||
253 |
r = [self.map[v] for v in p] |
|
254 |
f = [f for f,v,e in files] |
|
255 |
self.map[rev] = self.dest.putcommit(f, r, a, d, t) |
|
256 |
file(self.mapfile, "a").write("%s %s\n" % (rev, self.map[rev])) |
|
257 |
||
258 |
def convert(self): |
|
259 |
heads = self.source.getheads() |
|
260 |
parents = self.walktree(heads) |
|
261 |
t = self.toposort(parents) |
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262 |
t = [n for n in t if n not in self.map] |
316 | 263 |
num = len(t) |
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264 |
c = None |
316 | 265 |
|
266 |
for c in t: |
|
267 |
num -= 1 |
|
268 |
desc = self.commitcache[c][3].splitlines()[0] |
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|
269 |
#print num, desc |
316 | 270 |
self.copy(c) |
271 |
||
694 | 272 |
tags = self.source.gettags() |
273 |
ctags = {} |
|
274 |
for k in tags: |
|
275 |
v = tags[k] |
|
276 |
if v in self.map: |
|
277 |
ctags[k] = self.map[v] |
|
278 |
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279 |
if c and ctags: |
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nrev = self.dest.puttags(ctags) |
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281 |
# write another hash correspondence to override the previous |
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282 |
# one so we don't end up with extra tag heads |
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283 |
file(self.mapfile, "a").write("%s %s\n" % (c, nrev)) |
694 | 284 |
|
316 | 285 |
gitpath, hgpath, mapfile = sys.argv[1:] |
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286 |
if os.path.isdir(gitpath + "/.git"): |
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|
287 |
gitpath += "/.git" |
316 | 288 |
|
289 |
c = convert(convert_git(gitpath), convert_mercurial(hgpath), mapfile) |
|
290 |
c.convert() |