Mercurial > hg
view mercurial/bundlerepo.py @ 7787:b8d750daadde
Introduce HG_PREPEND to solve pretxn races
- add writepending to flush delayed writes to separate file
- add support in hooks for lazy evaluation of callable parameters
- add HG_PENDING to pretxn hooks
- call writepending if hook is used
- pass repo root to hook environment
- if HG_PENDING = repo root, we're in pretxn hook
- read pending data to make pending changesets visible
- filter HG_PENDING in tests/printenv.py
author | Matt Mackall <mpm@selenic.com> |
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date | Mon, 16 Feb 2009 19:35:07 -0600 |
parents | 1d54e2f6c0b7 |
children | af062a9fea9b |
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""" bundlerepo.py - repository class for viewing uncompressed bundles This provides a read-only repository interface to bundles as if they were part of the actual repository. Copyright 2006, 2007 Benoit Boissinot <bboissin@gmail.com> This software may be used and distributed according to the terms of the GNU General Public License, incorporated herein by reference. """ from node import hex, nullid, short from i18n import _ import changegroup, util, os, struct, bz2, zlib, tempfile, shutil, mdiff import repo, localrepo, changelog, manifest, filelog, revlog, context, error class bundlerevlog(revlog.revlog): def __init__(self, opener, indexfile, bundlefile, linkmapper=None): # How it works: # to retrieve a revision, we need to know the offset of # the revision in the bundlefile (an opened file). # # We store this offset in the index (start), to differentiate a # rev in the bundle and from a rev in the revlog, we check # len(index[r]). If the tuple is bigger than 7, it is a bundle # (it is bigger since we store the node to which the delta is) # revlog.revlog.__init__(self, opener, indexfile) self.bundlefile = bundlefile self.basemap = {} def chunkpositer(): for chunk in changegroup.chunkiter(bundlefile): pos = bundlefile.tell() yield chunk, pos - len(chunk) n = len(self) prev = None for chunk, start in chunkpositer(): size = len(chunk) if size < 80: raise util.Abort(_("invalid changegroup")) start += 80 size -= 80 node, p1, p2, cs = struct.unpack("20s20s20s20s", chunk[:80]) if node in self.nodemap: prev = node continue for p in (p1, p2): if not p in self.nodemap: raise error.LookupError(p1, self.indexfile, _("unknown parent")) if linkmapper is None: link = n else: link = linkmapper(cs) if not prev: prev = p1 # start, size, full unc. size, base (unused), link, p1, p2, node e = (revlog.offset_type(start, 0), size, -1, -1, link, self.rev(p1), self.rev(p2), node) self.basemap[n] = prev self.index.insert(-1, e) self.nodemap[node] = n prev = node n += 1 def bundle(self, rev): """is rev from the bundle""" if rev < 0: return False return rev in self.basemap def bundlebase(self, rev): return self.basemap[rev] def chunk(self, rev, df=None, cachelen=4096): # Warning: in case of bundle, the diff is against bundlebase, # not against rev - 1 # XXX: could use some caching if not self.bundle(rev): return revlog.revlog.chunk(self, rev, df) self.bundlefile.seek(self.start(rev)) return self.bundlefile.read(self.length(rev)) def revdiff(self, rev1, rev2): """return or calculate a delta between two revisions""" if self.bundle(rev1) and self.bundle(rev2): # hot path for bundle revb = self.rev(self.bundlebase(rev2)) if revb == rev1: return self.chunk(rev2) elif not self.bundle(rev1) and not self.bundle(rev2): return revlog.revlog.revdiff(self, rev1, rev2) return mdiff.textdiff(self.revision(self.node(rev1)), self.revision(self.node(rev2))) def revision(self, node): """return an uncompressed revision of a given""" if node == nullid: return "" text = None chain = [] iter_node = node rev = self.rev(iter_node) # reconstruct the revision if it is from a changegroup while self.bundle(rev): if self._cache and self._cache[0] == iter_node: text = self._cache[2] break chain.append(rev) iter_node = self.bundlebase(rev) rev = self.rev(iter_node) if text is None: text = revlog.revlog.revision(self, iter_node) while chain: delta = self.chunk(chain.pop()) text = mdiff.patches(text, [delta]) p1, p2 = self.parents(node) if node != revlog.hash(text, p1, p2): raise error.RevlogError(_("integrity check failed on %s:%d") % (self.datafile, self.rev(node))) self._cache = (node, self.rev(node), text) return text def addrevision(self, text, transaction, link, p1=None, p2=None, d=None): raise NotImplementedError def addgroup(self, revs, linkmapper, transaction): raise NotImplementedError def strip(self, rev, minlink): raise NotImplementedError def checksize(self): raise NotImplementedError class bundlechangelog(bundlerevlog, changelog.changelog): def __init__(self, opener, bundlefile): changelog.changelog.__init__(self, opener) bundlerevlog.__init__(self, opener, self.indexfile, bundlefile) class bundlemanifest(bundlerevlog, manifest.manifest): def __init__(self, opener, bundlefile, linkmapper): manifest.manifest.__init__(self, opener) bundlerevlog.__init__(self, opener, self.indexfile, bundlefile, linkmapper) class bundlefilelog(bundlerevlog, filelog.filelog): def __init__(self, opener, path, bundlefile, linkmapper): filelog.filelog.__init__(self, opener, path) bundlerevlog.__init__(self, opener, self.indexfile, bundlefile, linkmapper) class bundlerepository(localrepo.localrepository): def __init__(self, ui, path, bundlename): self._tempparent = None try: localrepo.localrepository.__init__(self, ui, path) except error.RepoError: self._tempparent = tempfile.mkdtemp() tmprepo = localrepo.instance(ui,self._tempparent,1) localrepo.localrepository.__init__(self, ui, self._tempparent) if path: self._url = 'bundle:' + path + '+' + bundlename else: self._url = 'bundle:' + bundlename self.tempfile = None self.bundlefile = open(bundlename, "rb") header = self.bundlefile.read(6) if not header.startswith("HG"): raise util.Abort(_("%s: not a Mercurial bundle file") % bundlename) elif not header.startswith("HG10"): raise util.Abort(_("%s: unknown bundle version") % bundlename) elif (header == "HG10BZ") or (header == "HG10GZ"): fdtemp, temp = tempfile.mkstemp(prefix="hg-bundle-", suffix=".hg10un", dir=self.path) self.tempfile = temp fptemp = os.fdopen(fdtemp, 'wb') def generator(f): if header == "HG10BZ": zd = bz2.BZ2Decompressor() zd.decompress("BZ") elif header == "HG10GZ": zd = zlib.decompressobj() for chunk in f: yield zd.decompress(chunk) gen = generator(util.filechunkiter(self.bundlefile, 4096)) try: fptemp.write("HG10UN") for chunk in gen: fptemp.write(chunk) finally: fptemp.close() self.bundlefile.close() self.bundlefile = open(self.tempfile, "rb") # seek right after the header self.bundlefile.seek(6) elif header == "HG10UN": # nothing to do pass else: raise util.Abort(_("%s: unknown bundle compression type") % bundlename) # dict with the mapping 'filename' -> position in the bundle self.bundlefilespos = {} def __getattr__(self, name): if name == 'changelog': self.changelog = bundlechangelog(self.sopener, self.bundlefile) self.manstart = self.bundlefile.tell() return self.changelog elif name == 'manifest': self.bundlefile.seek(self.manstart) self.manifest = bundlemanifest(self.sopener, self.bundlefile, self.changelog.rev) self.filestart = self.bundlefile.tell() return self.manifest elif name == 'manstart': self.changelog return self.manstart elif name == 'filestart': self.manifest return self.filestart else: raise AttributeError(name) def url(self): return self._url def file(self, f): if not self.bundlefilespos: self.bundlefile.seek(self.filestart) while 1: chunk = changegroup.getchunk(self.bundlefile) if not chunk: break self.bundlefilespos[chunk] = self.bundlefile.tell() for c in changegroup.chunkiter(self.bundlefile): pass if f[0] == '/': f = f[1:] if f in self.bundlefilespos: self.bundlefile.seek(self.bundlefilespos[f]) return bundlefilelog(self.sopener, f, self.bundlefile, self.changelog.rev) else: return filelog.filelog(self.sopener, f) def close(self): """Close assigned bundle file immediately.""" self.bundlefile.close() def __del__(self): bundlefile = getattr(self, 'bundlefile', None) if bundlefile and not bundlefile.closed: bundlefile.close() tempfile = getattr(self, 'tempfile', None) if tempfile is not None: os.unlink(tempfile) if self._tempparent: shutil.rmtree(self._tempparent, True) def cancopy(self): return False def getcwd(self): return os.getcwd() # always outside the repo def instance(ui, path, create): if create: raise util.Abort(_('cannot create new bundle repository')) parentpath = ui.config("bundle", "mainreporoot", "") if parentpath: # Try to make the full path relative so we get a nice, short URL. # In particular, we don't want temp dir names in test outputs. cwd = os.getcwd() if parentpath == cwd: parentpath = '' else: cwd = os.path.join(cwd,'') if parentpath.startswith(cwd): parentpath = parentpath[len(cwd):] path = util.drop_scheme('file', path) if path.startswith('bundle:'): path = util.drop_scheme('bundle', path) s = path.split("+", 1) if len(s) == 1: repopath, bundlename = parentpath, s[0] else: repopath, bundlename = s else: repopath, bundlename = parentpath, path return bundlerepository(ui, repopath, bundlename)