Mercurial > hg
view mercurial/repair.py @ 21545:43eecb4e23f8
merge: use separate lists for each action type
This replaces the grand unified action list that had multiple action types as
tuples in one big list. That list was iterated multiple times just to find
actions of a specific type. This data model also made some code more
convoluted than necessary.
Instead we now store actions as a tuple of lists. Using multiple lists gives a
bit of cut'n'pasted code but also enables other optimizations.
This patch uses 'if True:' to preserve indentations and help reviewing. It also
limits the number of conflicts with other pending patches. It can trivially be
cleaned up later.
author | Mads Kiilerich <madski@unity3d.com> |
---|---|
date | Fri, 28 Feb 2014 02:25:58 +0100 |
parents | 4d9d490d7bbe |
children | 445472225ccd |
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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. from mercurial import changegroup, exchange from mercurial.node import short from mercurial.i18n import _ import errno def _bundle(repo, bases, heads, node, suffix, compress=True): """create a bundle with the specified revisions as a backup""" cg = changegroup.changegroupsubset(repo, bases, heads, 'strip') backupdir = "strip-backup" vfs = repo.vfs if not vfs.isdir(backupdir): vfs.mkdir(backupdir) name = "%s/%s-%s.hg" % (backupdir, short(node), suffix) if compress: bundletype = "HG10BZ" else: bundletype = "HG10UN" return changegroup.writebundle(cg, name, bundletype, vfs) 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 _collectbrokencsets(repo, files, striprev): """return the changesets which will be broken by the truncation""" s = set() def collectone(revlog): _, brokenset = revlog.getstrippoint(striprev) s.update([revlog.linkrev(r) for r in brokenset]) collectone(repo.manifest) for fname in files: collectone(repo.file(fname)) return s def strip(ui, repo, nodelist, backup="all", topic='backup'): repo = repo.unfiltered() repo.destroying() cl = repo.changelog # TODO handle undo of merge sets if isinstance(nodelist, str): nodelist = [nodelist] striplist = [cl.rev(node) for node in nodelist] striprev = min(striplist) 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(striplist) for rev in striplist: for desc in cl.descendants([rev]): tostrip.add(desc) files = _collectfiles(repo, striprev) saverevs = _collectbrokencsets(repo, files, striprev) # compute heads saveheads = set(saverevs) for r in xrange(striprev + 1, len(cl)): if r not in tostrip: saverevs.add(r) saveheads.difference_update(cl.parentrevs(r)) saveheads.add(r) saveheads = [cl.node(r) for r in saveheads] # compute base nodes if saverevs: descendants = set(cl.descendants(saverevs)) saverevs.difference_update(descendants) savebases = [cl.node(r) for r in saverevs] stripbases = [cl.node(r) for r in tostrip] # For a set s, max(parents(s) - s) is the same as max(heads(::s - s)), but # is much faster newbmtarget = repo.revs('max(parents(%ld) - (%ld))', tostrip, tostrip) if newbmtarget: newbmtarget = repo[newbmtarget[0]].node() else: newbmtarget = '.' bm = repo._bookmarks updatebm = [] for m in bm: rev = repo[bm[m]].rev() if rev in tostrip: updatebm.append(m) # create a changegroup for all the branches we need to keep backupfile = None vfs = repo.vfs if backup == "all": backupfile = _bundle(repo, stripbases, cl.heads(), node, topic) repo.ui.status(_("saved backup bundle to %s\n") % vfs.join(backupfile)) repo.ui.log("backupbundle", "saved backup bundle to %s\n", vfs.join(backupfile)) if saveheads or savebases: # do not compress partial bundle if we remove it from disk later chgrpfile = _bundle(repo, savebases, saveheads, node, 'temp', 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) if troffset == 0: repo.store.markremoved(file) tr.close() except: # re-raises tr.abort() raise if saveheads or savebases: ui.note(_("adding branch\n")) f = vfs.open(chgrpfile, "rb") gen = exchange.readbundle(ui, f, chgrpfile, vfs) if not repo.ui.verbose: # silence internal shuffling chatter repo.ui.pushbuffer() changegroup.addchangegroup(repo, gen, 'strip', 'bundle:' + vfs.join(chgrpfile), True) if not repo.ui.verbose: repo.ui.popbuffer() f.close() if not keeppartialbundle: vfs.unlink(chgrpfile) # remove undo files for undovfs, undofile in repo.undofiles(): try: undovfs.unlink(undofile) except OSError, e: if e.errno != errno.ENOENT: ui.warn(_('error removing %s: %s\n') % (undovfs.join(undofile), str(e))) for m in updatebm: bm[m] = repo[newbmtarget].node() bm.write() except: # re-raises if backupfile: ui.warn(_("strip failed, full bundle stored in '%s'\n") % vfs.join(backupfile)) elif saveheads: ui.warn(_("strip failed, partial bundle stored in '%s'\n") % vfs.join(chgrpfile)) raise repo.destroyed()