""" 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 Benoit Boissinot This software may be used and distributed according to the terms of the GNU General Public License, incorporated herein by reference. """ from node import * from i18n import gettext as _ from demandload import demandload demandload(globals(), "util os struct") import localrepo, changelog, manifest, filelog, revlog def getchunk(source): """get a chunk from a group""" d = source.read(4) if not d: return "" l = struct.unpack(">l", d)[0] if l <= 4: return "" d = source.read(l - 4) if len(d) < l - 4: raise util.Abort(_("premature EOF reading chunk" " (got %d bytes, expected %d)") % (len(d), l - 4)) return d class bundlerevlog(revlog.revlog): def __init__(self, opener, indexfile, datafile, 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, datafile) self.bundlefile = bundlefile def genchunk(): while 1: pos = bundlefile.tell() chunk = getchunk(bundlefile) if not chunk: break yield chunk, pos + 4 # XXX struct.calcsize(">l") == 4 n = self.count() prev = None for chunk, start in genchunk(): 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 RevlogError(_("unknown parent %s") % short(p1)) if linkmapper is None: link = n else: link = linkmapper(cs) if not prev: prev = p1 # start, size, base is not used, link, p1, p2, delta ref e = (start, size, None, link, p1, p2, node, prev) self.index.append(e) self.nodemap[node] = n prev = node n += 1 def bundle(self, rev): """is rev from the bundle""" if rev < 0: return False return len(self.index[rev]) > 7 def bundlebase(self, rev): return self.index[rev][7] def chunk(self, rev): # 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) 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.chunk(self, rev1, rev2) return self.diff(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 = self.patches(text, [delta]) p1, p2 = self.parents(node) if node != revlog.hash(text, p1, p2): raise RevlogError(_("integrity check failed on %s:%d") % (self.datafile, self.rev(node))) self.cache = (node, rev, text) return text def addrevision(self, text, transaction, link, p1=None, p2=None, d=None): raise NotImplementedError def addgroup(self, revs, linkmapper, transaction, unique=0): 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, "00changelog.i", "00changelog.d", bundlefile) class bundlemanifest(bundlerevlog, manifest.manifest): def __init__(self, opener, bundlefile, linkmapper): manifest.manifest.__init__(self, opener) bundlerevlog.__init__(self, opener, self.indexfile, self.datafile, 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, self.datafile, bundlefile, linkmapper) class bundlerepository(localrepo.localrepository): def __init__(self, ui, path, bundlename): localrepo.localrepository.__init__(self, ui, path) f = open(bundlename, "rb") s = os.fstat(f.fileno()) self.bundlefile = f 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": raise util.Abort(_("%s: compressed bundle not supported") % bundlename) elif header == "HG10UN": # uncompressed bundle supported pass else: raise util.Abort(_("%s: unknown bundle compression type") % bundlename) self.changelog = bundlechangelog(self.opener, self.bundlefile) self.manifest = bundlemanifest(self.opener, self.bundlefile, self.changelog.rev) # dict with the mapping 'filename' -> position in the bundle self.bundlefilespos = {} while 1: f = getchunk(self.bundlefile) if not f: break self.bundlefilespos[f] = self.bundlefile.tell() while getchunk(self.bundlefile): pass def dev(self): return -1 def file(self, f): if f[0] == '/': f = f[1:] if f in self.bundlefilespos: self.bundlefile.seek(self.bundlefilespos[f]) return bundlefilelog(self.opener, f, self.bundlefile, self.changelog.rev) else: return filelog.filelog(self.opener, f) def close(self): """Close assigned bundle file immediately.""" self.bundlefile.close()