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