# HG changeset patch # User Mads Kiilerich # Date 1358860088 -3600 # Node ID ead7a902998ca6798a2db90936de5e9f7a7b441f # Parent 3c91ec4419a6f059d8359349f35466a5afb107e4 introduce unionrepo repository class for viewing union of repositories diff -r 3c91ec4419a6 -r ead7a902998c rhodecode/lib/unionrepo.py --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/rhodecode/lib/unionrepo.py Tue Jan 22 14:08:08 2013 +0100 @@ -0,0 +1,181 @@ +# unionrepo.py - repository class for viewing union of repositories +# +# Derived from Mercurial 2.5 bundlerepo.py +# Copyright 2006, 2007 Benoit Boissinot +# Copyright 2013 Unity Technologies, Mads Kiilerich +# +# This software may be used and distributed according to the terms of the +# GNU General Public License version 2 or any later version. + +"""Repository class for in-memory pull of one local repository to another. +""" + +from mercurial.node import nullid +from mercurial import util, mdiff +from mercurial import localrepo, changelog, manifest, filelog, revlog + +class unionrevlog(revlog.revlog): + def __init__(self, opener, indexfile, revlog2, linkmapper): + # How it works: + # To retrieve a revision, we just need to know the node id so we can + # look it up in revlog2. + # + # basemap is indexed with revisions coming from the second revlog. + # + # To differentiate a rev in the second revlog from a rev in the revlog, + # we check revision against basemap. + revlog.revlog.__init__(self, opener, indexfile) + self.revlog2 = revlog2 + + self.basemap = {} # mapping rev that is in revlog2 to ... nothing + n = len(self) + self.bundlerevs = set() # used by 'bundle()' revset expression + for rev2 in self.revlog2: + rev = self.revlog2.index[rev2] + # rev numbers - in revlog2, very different from self.rev + _start, _csize, _rsize, _base, linkrev, p1rev, p2rev, node = rev + + if linkmapper is None: # link is to same revlog + assert linkrev == rev2 # we never link back + link = n + else: # rev must be mapped from repo2 cl to unified cl by linkmapper + link = linkmapper(linkrev) + + if node in self.nodemap: + # this happens for for the common revlog revisions + self.bundlerevs.add(self.nodemap[node]) + continue + + p1node = self.revlog2.node(p1rev) + p2node = self.revlog2.node(p2rev) + + e = (None, None, None, None, + link, self.rev(p1node), self.rev(p2node), node) + self.basemap[n] = None + self.index.insert(-1, e) + self.nodemap[node] = n + self.bundlerevs.add(n) + n += 1 + + def _chunk(self, rev): + if rev not in self.basemap: + return revlog.revlog._chunk(self, rev) + return self.revlog2._chunk(self.node(rev)) + + def revdiff(self, rev1, rev2): + """return or calculate a delta between two revisions""" + if rev1 in self.basemap and rev2 in self.basemap: + return self.revlog2.revdiff( + self.revlog2.rev(self.node(rev1)), + self.revlog2.rev(self.node(rev2))) + elif rev1 not in self.basemap and rev2 not in self.basemap: + return revlog.revlog.revdiff(self, rev1, rev2) + + return mdiff.textdiff(self.revision(self.node(rev1)), + self.revision(self.node(rev2))) + + def revision(self, nodeorrev): + """return an uncompressed revision of a given node or revision + number. + """ + if isinstance(nodeorrev, int): + rev = nodeorrev + node = self.node(rev) + else: + node = nodeorrev + rev = self.rev(node) + + if node == nullid: + return "" + + if rev in self.basemap: + text = self.revlog2.revision(node) + self._cache = (node, rev, text) + else: + text = revlog.revlog.revision(self, rev) + # already cached + 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 unionchangelog(unionrevlog, changelog.changelog): + def __init__(self, opener, opener2): + changelog.changelog.__init__(self, opener) + linkmapper = None + changelog2 = changelog.changelog(opener2) + unionrevlog.__init__(self, opener, self.indexfile, changelog2, + linkmapper) + +class unionmanifest(unionrevlog, manifest.manifest): + def __init__(self, opener, opener2, linkmapper): + manifest.manifest.__init__(self, opener) + manifest2 = manifest.manifest(opener2) + unionrevlog.__init__(self, opener, self.indexfile, manifest2, + linkmapper) + +class unionfilelog(unionrevlog, filelog.filelog): + def __init__(self, opener, path, opener2, linkmapper, repo): + filelog.filelog.__init__(self, opener, path) + filelog2 = filelog.filelog(opener2, path) + unionrevlog.__init__(self, opener, self.indexfile, filelog2, + linkmapper) + self._repo = repo + + def _file(self, f): + self._repo.file(f) + +class unionpeer(localrepo.localpeer): + def canpush(self): + return False + +class unionrepository(localrepo.localrepository): + def __init__(self, ui, path, path2): + localrepo.localrepository.__init__(self, ui, path) + self.ui.setconfig('phases', 'publish', False) + + self._url = 'union:%s+%s' % (util.expandpath(path), + util.expandpath(path2)) + self.repo2 = localrepo.localrepository(ui, path2) + + @util.propertycache + def changelog(self): + return unionchangelog(self.sopener, self.repo2.sopener) + + def _clrev(self, rev2): + """map from repo2 changelog rev to temporary rev in self.changelog""" + node = self.repo2.changelog.node(rev2) + return self.changelog.rev(node) + + @util.propertycache + def manifest(self): + return unionmanifest(self.sopener, self.repo2.sopener, + self._clrev) + + def url(self): + return self._url + + def file(self, f): + return unionfilelog(self.sopener, f, self.repo2.sopener, + self._clrev, self) + + def close(self): + self.repo2.close() + + def cancopy(self): + return False + + def peer(self): + return unionpeer(self) + +def instance(ui, path, create): + u = util.url(path) + assert u.scheme == 'union' + repopath, repopath2 = u.path.split("+", 1) + return unionrepository(ui, repopath, repopath2)