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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, incorporated herein by reference.
import changegroup, revlog, os, commands
def strip(ui, repo, rev, backup="all"):
def limitheads(chlog, stop):
"""return the list of all nodes that have no children"""
p = {}
h = []
stoprev = 0
if stop in chlog.nodemap:
stoprev = chlog.rev(stop)
for r in xrange(chlog.count() - 1, -1, -1):
n = chlog.node(r)
if n not in p:
h.append(n)
if n == stop:
break
if r < stoprev:
break
for pn in chlog.parents(n):
p[pn] = 1
return h
def bundle(repo, bases, heads, rev, suffix):
cg = repo.changegroupsubset(bases, heads, 'strip')
backupdir = repo.join("strip-backup")
if not os.path.isdir(backupdir):
os.mkdir(backupdir)
name = os.path.join(backupdir, "%s-%s" % (revlog.short(rev), suffix))
ui.warn("saving bundle to %s\n" % name)
return changegroup.writebundle(cg, name, "HG10BZ")
def stripall(revnum):
mm = repo.changectx(rev).manifest()
seen = {}
for x in xrange(revnum, repo.changelog.count()):
for f in repo.changectx(x).files():
if f in seen:
continue
seen[f] = 1
if f in mm:
filerev = mm[f]
else:
filerev = 0
seen[f] = filerev
# we go in two steps here so the strip loop happens in a
# sensible order. When stripping many files, this helps keep
# our disk access patterns under control.
seen_list = seen.keys()
seen_list.sort()
for f in seen_list:
ff = repo.file(f)
filerev = seen[f]
if filerev != 0:
if filerev in ff.nodemap:
filerev = ff.rev(filerev)
else:
filerev = 0
ff.strip(filerev, revnum)
chlog = repo.changelog
# TODO delete the undo files, and handle undo of merge sets
pp = chlog.parents(rev)
revnum = chlog.rev(rev)
# save is a list of all the branches we are truncating away
# that we actually want to keep. changegroup will be used
# to preserve them and add them back after the truncate
saveheads = []
savebases = {}
heads = limitheads(chlog, rev)
seen = {}
# search through all the heads, finding those where the revision
# we want to strip away is an ancestor. Also look for merges
# that might be turned into new heads by the strip.
while heads:
h = heads.pop()
n = h
while True:
seen[n] = 1
pp = chlog.parents(n)
if pp[1] != revlog.nullid:
for p in pp:
if chlog.rev(p) > revnum and p not in seen:
heads.append(p)
if pp[0] == revlog.nullid:
break
if chlog.rev(pp[0]) < revnum:
break
n = pp[0]
if n == rev:
break
r = chlog.reachable(h, rev)
if rev not in r:
saveheads.append(h)
for x in r:
if chlog.rev(x) > revnum:
savebases[x] = 1
# create a changegroup for all the branches we need to keep
if backup == "all":
bundle(repo, [rev], chlog.heads(), rev, 'backup')
if saveheads:
chgrpfile = bundle(repo, savebases.keys(), saveheads, rev, 'temp')
stripall(revnum)
change = chlog.read(rev)
chlog.strip(revnum, revnum)
repo.manifest.strip(repo.manifest.rev(change[0]), revnum)
if saveheads:
ui.status("adding branch\n")
commands.unbundle(ui, repo, "file:%s" % chgrpfile, update=False)
if backup != "strip":
os.unlink(chgrpfile)
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