checknlink: return False if .hgtmp file preexists (issue2517)
If os_link fails on Windows, errno is always errno.EINVAL,
so we can't really say if the testlink could not be created
because (a) the FS doesn't support hardlinks or (b) there
is a leaked .hgtmp file lying around from a previous crashed
run.
So let's err on the safe side, keep the code simple and assume
we can't detect hardlinks in both cases.
# 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(cl, 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(cl, repo.manifest)
if extra:
extranodes[1] = extra
for fname in files:
f = repo.file(fname)
extra = collectone(cl, 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()