mirror of
https://github.com/facebook/sapling.git
synced 2024-10-10 08:47:12 +03:00
It seems like we used to pick the oldest possible version of the changegroup to use for bundles created by the repair module (used e.g. by "hg strip" and for temporary bundles by "hg rebase"). I tried to preserve that behavior when I created the changegroup.safeversion() method in 77f74106b264 (changegroup: introduce safeversion(), 2016-01-19). However, we have recently chagned our minds and decided that these commands are only used locally and downgrades are unlikely. That decicion allowed us to start adding obsmarker and phase information to these bundles. However, as the bug report shows, it means we get different behavior e.g. when generaldelta is not enabled (because when it was enabled, it forced us to use bundle2). The commit that actually caused the reported bug was 26d535788092 (strip: include phases in bundle (BC), 2017-06-15). So, since we now depend on having more information in the bundles, let's make sure we instead pick the newest possible changegroup version. Differential Revision: https://phab.mercurial-scm.org/D715
444 lines
15 KiB
Python
444 lines
15 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 or any later version.
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from __future__ import absolute_import
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import errno
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import hashlib
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from .i18n import _
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from .node import (
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hex,
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short,
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)
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from . import (
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bundle2,
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changegroup,
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discovery,
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error,
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exchange,
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obsolete,
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obsutil,
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util,
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)
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def _bundle(repo, bases, heads, node, suffix, compress=True, obsolescence=True):
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"""create a bundle with the specified revisions as a backup"""
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backupdir = "strip-backup"
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vfs = repo.vfs
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if not vfs.isdir(backupdir):
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vfs.mkdir(backupdir)
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# Include a hash of all the nodes in the filename for uniqueness
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allcommits = repo.set('%ln::%ln', bases, heads)
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allhashes = sorted(c.hex() for c in allcommits)
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totalhash = hashlib.sha1(''.join(allhashes)).digest()
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name = "%s/%s-%s-%s.hg" % (backupdir, short(node),
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hex(totalhash[:4]), suffix)
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cgversion = changegroup.localversion(repo)
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comp = None
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if cgversion != '01':
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bundletype = "HG20"
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if compress:
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comp = 'BZ'
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elif compress:
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bundletype = "HG10BZ"
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else:
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bundletype = "HG10UN"
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outgoing = discovery.outgoing(repo, missingroots=bases, missingheads=heads)
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contentopts = {
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'cg.version': cgversion,
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'obsolescence': obsolescence,
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'phases': True,
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}
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return bundle2.writenewbundle(repo.ui, repo, 'strip', name, bundletype,
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outgoing, contentopts, vfs, compression=comp)
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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 _collectrevlog(revlog, striprev):
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_, brokenset = revlog.getstrippoint(striprev)
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return [revlog.linkrev(r) for r in brokenset]
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def _collectmanifest(repo, striprev):
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return _collectrevlog(repo.manifestlog._revlog, striprev)
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def _collectbrokencsets(repo, files, striprev):
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"""return the changesets which will be broken by the truncation"""
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s = set()
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s.update(_collectmanifest(repo, striprev))
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for fname in files:
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s.update(_collectrevlog(repo.file(fname), striprev))
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return s
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def strip(ui, repo, nodelist, backup=True, topic='backup'):
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# This function requires the caller to lock the repo, but it operates
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# within a transaction of its own, and thus requires there to be no current
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# transaction when it is called.
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if repo.currenttransaction() is not None:
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raise error.ProgrammingError('cannot strip from inside a transaction')
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# Simple way to maintain backwards compatibility for this
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# argument.
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if backup in ['none', 'strip']:
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backup = False
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repo = repo.unfiltered()
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repo.destroying()
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cl = repo.changelog
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# TODO handle undo of merge sets
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if isinstance(nodelist, str):
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nodelist = [nodelist]
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striplist = [cl.rev(node) for node in nodelist]
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striprev = min(striplist)
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files = _collectfiles(repo, striprev)
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saverevs = _collectbrokencsets(repo, files, striprev)
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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(striplist)
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saveheads = set(saverevs)
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for r in cl.revs(start=striprev + 1):
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if any(p in tostrip for p in cl.parentrevs(r)):
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tostrip.add(r)
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if r not in tostrip:
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saverevs.add(r)
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saveheads.difference_update(cl.parentrevs(r))
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saveheads.add(r)
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saveheads = [cl.node(r) for r in saveheads]
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# compute base nodes
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if saverevs:
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descendants = set(cl.descendants(saverevs))
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saverevs.difference_update(descendants)
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savebases = [cl.node(r) for r in saverevs]
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stripbases = [cl.node(r) for r in tostrip]
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stripobsidx = obsmarkers = ()
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if repo.ui.configbool('devel', 'strip-obsmarkers'):
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obsmarkers = obsutil.exclusivemarkers(repo, stripbases)
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if obsmarkers:
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stripobsidx = [i for i, m in enumerate(repo.obsstore)
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if m in obsmarkers]
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# For a set s, max(parents(s) - s) is the same as max(heads(::s - s)), but
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# is much faster
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newbmtarget = repo.revs('max(parents(%ld) - (%ld))', tostrip, tostrip)
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if newbmtarget:
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newbmtarget = repo[newbmtarget.first()].node()
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else:
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newbmtarget = '.'
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bm = repo._bookmarks
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updatebm = []
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for m in bm:
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rev = repo[bm[m]].rev()
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if rev in tostrip:
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updatebm.append(m)
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# create a changegroup for all the branches we need to keep
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backupfile = None
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vfs = repo.vfs
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node = nodelist[-1]
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if backup:
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backupfile = _bundle(repo, stripbases, cl.heads(), node, topic)
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repo.ui.status(_("saved backup bundle to %s\n") %
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vfs.join(backupfile))
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repo.ui.log("backupbundle", "saved backup bundle to %s\n",
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vfs.join(backupfile))
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tmpbundlefile = None
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if saveheads:
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# do not compress temporary bundle if we remove it from disk later
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#
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# We do not include obsolescence, it might re-introduce prune markers
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# we are trying to strip. This is harmless since the stripped markers
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# are already backed up and we did not touched the markers for the
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# saved changesets.
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tmpbundlefile = _bundle(repo, savebases, saveheads, node, 'temp',
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compress=False, obsolescence=False)
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try:
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with repo.transaction("strip") as tr:
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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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stripmanifest(repo, striprev, tr, files)
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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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for i in xrange(offset, len(tr.entries)):
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file, troffset, ignore = tr.entries[i]
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with repo.svfs(file, 'a', checkambig=True) as fp:
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fp.truncate(troffset)
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if troffset == 0:
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repo.store.markremoved(file)
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deleteobsmarkers(repo.obsstore, stripobsidx)
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del repo.obsstore
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repo._phasecache.filterunknown(repo)
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if tmpbundlefile:
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ui.note(_("adding branch\n"))
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f = vfs.open(tmpbundlefile, "rb")
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gen = exchange.readbundle(ui, f, tmpbundlefile, vfs)
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if not repo.ui.verbose:
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# silence internal shuffling chatter
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repo.ui.pushbuffer()
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tmpbundleurl = 'bundle:' + vfs.join(tmpbundlefile)
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txnname = 'strip'
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if not isinstance(gen, bundle2.unbundle20):
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txnname = "strip\n%s" % util.hidepassword(tmpbundleurl)
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with repo.transaction(txnname) as tr:
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bundle2.applybundle(repo, gen, tr, source='strip',
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url=tmpbundleurl)
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if not repo.ui.verbose:
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repo.ui.popbuffer()
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f.close()
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repo._phasecache.invalidate()
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with repo.transaction('repair') as tr:
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bmchanges = [(m, repo[newbmtarget].node()) for m in updatebm]
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bm.applychanges(repo, tr, bmchanges)
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# remove undo files
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for undovfs, undofile in repo.undofiles():
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try:
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undovfs.unlink(undofile)
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except OSError as e:
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if e.errno != errno.ENOENT:
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ui.warn(_('error removing %s: %s\n') %
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(undovfs.join(undofile), str(e)))
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except: # re-raises
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if backupfile:
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ui.warn(_("strip failed, backup bundle stored in '%s'\n")
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% vfs.join(backupfile))
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if tmpbundlefile:
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ui.warn(_("strip failed, unrecovered changes stored in '%s'\n")
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% vfs.join(tmpbundlefile))
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ui.warn(_("(fix the problem, then recover the changesets with "
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"\"hg unbundle '%s'\")\n") % vfs.join(tmpbundlefile))
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raise
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else:
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if tmpbundlefile:
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# Remove temporary bundle only if there were no exceptions
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vfs.unlink(tmpbundlefile)
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repo.destroyed()
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# return the backup file path (or None if 'backup' was False) so
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# extensions can use it
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return backupfile
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def safestriproots(ui, repo, nodes):
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"""return list of roots of nodes where descendants are covered by nodes"""
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torev = repo.unfiltered().changelog.rev
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revs = set(torev(n) for n in nodes)
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# tostrip = wanted - unsafe = wanted - ancestors(orphaned)
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# orphaned = affected - wanted
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# affected = descendants(roots(wanted))
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# wanted = revs
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tostrip = set(repo.revs('%ld-(::((roots(%ld)::)-%ld))', revs, revs, revs))
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notstrip = revs - tostrip
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if notstrip:
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nodestr = ', '.join(sorted(short(repo[n].node()) for n in notstrip))
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ui.warn(_('warning: orphaned descendants detected, '
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'not stripping %s\n') % nodestr)
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return [c.node() for c in repo.set('roots(%ld)', tostrip)]
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class stripcallback(object):
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"""used as a transaction postclose callback"""
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def __init__(self, ui, repo, backup, topic):
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self.ui = ui
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self.repo = repo
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self.backup = backup
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self.topic = topic or 'backup'
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self.nodelist = []
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def addnodes(self, nodes):
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self.nodelist.extend(nodes)
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def __call__(self, tr):
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roots = safestriproots(self.ui, self.repo, self.nodelist)
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if roots:
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strip(self.ui, self.repo, roots, self.backup, self.topic)
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def delayedstrip(ui, repo, nodelist, topic=None):
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"""like strip, but works inside transaction and won't strip irreverent revs
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nodelist must explicitly contain all descendants. Otherwise a warning will
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be printed that some nodes are not stripped.
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Always do a backup. The last non-None "topic" will be used as the backup
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topic name. The default backup topic name is "backup".
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"""
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tr = repo.currenttransaction()
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if not tr:
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nodes = safestriproots(ui, repo, nodelist)
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return strip(ui, repo, nodes, True, topic)
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# transaction postclose callbacks are called in alphabet order.
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# use '\xff' as prefix so we are likely to be called last.
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callback = tr.getpostclose('\xffstrip')
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if callback is None:
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callback = stripcallback(ui, repo, True, topic)
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tr.addpostclose('\xffstrip', callback)
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if topic:
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callback.topic = topic
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callback.addnodes(nodelist)
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def stripmanifest(repo, striprev, tr, files):
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revlog = repo.manifestlog._revlog
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revlog.strip(striprev, tr)
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striptrees(repo, tr, striprev, files)
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def striptrees(repo, tr, striprev, files):
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if 'treemanifest' in repo.requirements: # safe but unnecessary
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# otherwise
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for unencoded, encoded, size in repo.store.datafiles():
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if (unencoded.startswith('meta/') and
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unencoded.endswith('00manifest.i')):
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dir = unencoded[5:-12]
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repo.manifestlog._revlog.dirlog(dir).strip(striprev, tr)
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def rebuildfncache(ui, repo):
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"""Rebuilds the fncache file from repo history.
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Missing entries will be added. Extra entries will be removed.
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"""
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repo = repo.unfiltered()
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if 'fncache' not in repo.requirements:
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ui.warn(_('(not rebuilding fncache because repository does not '
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'support fncache)\n'))
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return
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with repo.lock():
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fnc = repo.store.fncache
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# Trigger load of fncache.
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if 'irrelevant' in fnc:
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pass
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oldentries = set(fnc.entries)
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newentries = set()
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seenfiles = set()
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repolen = len(repo)
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for rev in repo:
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ui.progress(_('rebuilding'), rev, total=repolen,
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unit=_('changesets'))
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ctx = repo[rev]
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for f in ctx.files():
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# This is to minimize I/O.
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if f in seenfiles:
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continue
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seenfiles.add(f)
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i = 'data/%s.i' % f
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d = 'data/%s.d' % f
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if repo.store._exists(i):
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newentries.add(i)
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if repo.store._exists(d):
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newentries.add(d)
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ui.progress(_('rebuilding'), None)
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if 'treemanifest' in repo.requirements: # safe but unnecessary otherwise
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for dir in util.dirs(seenfiles):
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i = 'meta/%s/00manifest.i' % dir
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d = 'meta/%s/00manifest.d' % dir
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if repo.store._exists(i):
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newentries.add(i)
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if repo.store._exists(d):
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newentries.add(d)
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addcount = len(newentries - oldentries)
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removecount = len(oldentries - newentries)
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for p in sorted(oldentries - newentries):
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ui.write(_('removing %s\n') % p)
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for p in sorted(newentries - oldentries):
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ui.write(_('adding %s\n') % p)
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if addcount or removecount:
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ui.write(_('%d items added, %d removed from fncache\n') %
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(addcount, removecount))
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fnc.entries = newentries
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fnc._dirty = True
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with repo.transaction('fncache') as tr:
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fnc.write(tr)
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else:
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ui.write(_('fncache already up to date\n'))
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def stripbmrevset(repo, mark):
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"""
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The revset to strip when strip is called with -B mark
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Needs to live here so extensions can use it and wrap it even when strip is
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not enabled or not present on a box.
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"""
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return repo.revs("ancestors(bookmark(%s)) - "
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"ancestors(head() and not bookmark(%s)) - "
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"ancestors(bookmark() and not bookmark(%s))",
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mark, mark, mark)
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def deleteobsmarkers(obsstore, indices):
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"""Delete some obsmarkers from obsstore and return how many were deleted
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'indices' is a list of ints which are the indices
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of the markers to be deleted.
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Every invocation of this function completely rewrites the obsstore file,
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skipping the markers we want to be removed. The new temporary file is
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created, remaining markers are written there and on .close() this file
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gets atomically renamed to obsstore, thus guaranteeing consistency."""
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if not indices:
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# we don't want to rewrite the obsstore with the same content
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return
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left = []
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current = obsstore._all
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n = 0
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for i, m in enumerate(current):
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if i in indices:
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n += 1
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continue
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left.append(m)
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newobsstorefile = obsstore.svfs('obsstore', 'w', atomictemp=True)
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for bytes in obsolete.encodemarkers(left, True, obsstore._version):
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newobsstorefile.write(bytes)
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newobsstorefile.close()
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return n
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