Mercurial > hg
view mercurial/repair.py @ 12044:bcc7139521b7
bundlerepo: remove duplication of bundle decompressors
author | Matt Mackall <mpm@selenic.com> |
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date | Wed, 25 Aug 2010 16:55:54 -0500 |
parents | 00cde9bddbe4 |
children | 798ef5b19cb1 |
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# repair.py - functions for repository repair for mercurial # # Copyright 2005, 2006 Chris Mason <mason@suse.com> # Copyright 2007 Matt Mackall # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. import changegroup from node import nullrev, short from i18n import _ import os def _bundle(repo, bases, heads, node, suffix, extranodes=None, compress=True): """create a bundle with the specified revisions as a backup""" cg = repo.changegroupsubset(bases, heads, 'strip', extranodes) backupdir = repo.join("strip-backup") if not os.path.isdir(backupdir): os.mkdir(backupdir) name = os.path.join(backupdir, "%s-%s.hg" % (short(node), suffix)) if compress: bundletype = "HG10BZ" else: bundletype = "HG10UN" return changegroup.writebundle(cg, name, bundletype) def _collectfiles(repo, striprev): """find out the filelogs affected by the strip""" files = set() for x in xrange(striprev, len(repo)): files.update(repo[x].files()) return sorted(files) def _collectextranodes(repo, files, link): """return the nodes that have to be saved before the strip""" def collectone(revlog): extra = [] startrev = count = len(revlog) # find the truncation point of the revlog for i in xrange(count): lrev = revlog.linkrev(i) if lrev >= link: startrev = i + 1 break # see if any revision after that point has a linkrev less than link # (we have to manually save these guys) for i in xrange(startrev, count): node = revlog.node(i) lrev = revlog.linkrev(i) if lrev < link: extra.append((node, cl.node(lrev))) return extra extranodes = {} cl = repo.changelog extra = collectone(repo.manifest) if extra: extranodes[1] = extra for fname in files: f = repo.file(fname) extra = collectone(f) if extra: extranodes[fname] = extra return extranodes def strip(ui, repo, node, backup="all"): cl = repo.changelog # TODO delete the undo files, and handle undo of merge sets striprev = cl.rev(node) keeppartialbundle = backup == 'strip' # Some revisions with rev > striprev may not be descendants of striprev. # We have to find these revisions and put them in a bundle, so that # we can restore them after the truncations. # To create the bundle we use repo.changegroupsubset which requires # the list of heads and bases of the set of interesting revisions. # (head = revision in the set that has no descendant in the set; # base = revision in the set that has no ancestor in the set) tostrip = set((striprev,)) saveheads = set() savebases = [] for r in xrange(striprev + 1, len(cl)): parents = cl.parentrevs(r) if parents[0] in tostrip or parents[1] in tostrip: # r is a descendant of striprev tostrip.add(r) # if this is a merge and one of the parents does not descend # from striprev, mark that parent as a savehead. if parents[1] != nullrev: for p in parents: if p not in tostrip and p > striprev: saveheads.add(p) else: # if no parents of this revision will be stripped, mark it as # a savebase if parents[0] < striprev and parents[1] < striprev: savebases.append(cl.node(r)) saveheads.difference_update(parents) saveheads.add(r) saveheads = [cl.node(r) for r in saveheads] files = _collectfiles(repo, striprev) extranodes = _collectextranodes(repo, files, striprev) # create a changegroup for all the branches we need to keep backupfile = None if backup == "all": backupfile = _bundle(repo, [node], cl.heads(), node, 'backup') repo.ui.status(_("saved backup bundle to %s\n") % backupfile) if saveheads or extranodes: # do not compress partial bundle if we remove it from disk later chgrpfile = _bundle(repo, savebases, saveheads, node, 'temp', extranodes=extranodes, compress=keeppartialbundle) mfst = repo.manifest tr = repo.transaction("strip") offset = len(tr.entries) try: tr.startgroup() cl.strip(striprev, tr) mfst.strip(striprev, tr) for fn in files: repo.file(fn).strip(striprev, tr) tr.endgroup() try: for i in xrange(offset, len(tr.entries)): file, troffset, ignore = tr.entries[i] repo.sopener(file, 'a').truncate(troffset) tr.close() except: tr.abort() raise if saveheads or extranodes: ui.note(_("adding branch\n")) f = open(chgrpfile, "rb") gen = changegroup.readbundle(f, chgrpfile) if not repo.ui.verbose: # silence internal shuffling chatter repo.ui.pushbuffer() repo.addchangegroup(gen, 'strip', 'bundle:' + chgrpfile, True) if not repo.ui.verbose: repo.ui.popbuffer() f.close() if not keeppartialbundle: os.unlink(chgrpfile) except: if backupfile: ui.warn(_("strip failed, full bundle stored in '%s'\n") % backupfile) elif saveheads: ui.warn(_("strip failed, partial bundle stored in '%s'\n") % chgrpfile) raise repo.destroyed()