Mercurial > hg > mercurial-crew-with-dirclash
view mercurial/bundlerepo.py @ 2089:cb99c711c59f
make appendfile simpler so it does not break with revlogng on windows.
it used to cache open files. this made revlogng break because it wants
to rename files when splitting .i into .i/.d, but cannot rename or unlink
open files on windows.
new code is bit slower, but safe on linux and windows. proper fix for
too many open/close of changelog/manifest belongs in different place.
can get 10% speed improvement back.
author | Vadim Gelfer <vadim.gelfer@gmail.com> |
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date | Wed, 19 Apr 2006 08:33:46 -0700 |
parents | 01ee43dda681 |
children | c6c019fd5db1 |
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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 Benoit Boissinot <benoit.boissinot@ens-lyon.org> 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(), "changegroup util os struct") import localrepo, changelog, manifest, filelog, revlog 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 self.basemap = {} def chunkpositer(): for chunk in changegroup.chunkiter(bundlefile): pos = bundlefile.tell() yield chunk, pos - len(chunk) n = self.count() 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 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) self.basemap[n] = 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 rev in self.basemap def bundlebase(self, rev): return self.basemap[rev] def chunk(self, rev, df=None): # 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 = changegroup.getchunk(self.bundlefile) if not f: break self.bundlefilespos[f] = self.bundlefile.tell() for c in changegroup.chunkiter(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()