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view mercurial/unionrepo.py @ 48687:f8f2ecdde4b5
branchmap: skip obsolete revisions while computing heads
It's time to make this part of core Mercurial obsolescence-aware.
Not considering obsolete revisions when computing heads is clearly what
Mercurial should do. But there are a couple of small issues:
- Let's say tip of the repo is obsolete. There are two ways of finding tiprev
for branchcache (both are in use): looking at input data for update() and
looking at computed heads after update(). Previously, repo tip would be
tiprev of the branchcache. With this patch, an obsolete revision can no
longer be tiprev. And depending on what way we use for finding tiprev (input
data vs computed heads) we'll get a different result. This is relevant when
recomputing cache key from cache contents, and may lead to updating cache for
obsolete revisions multiple times (not from scratch, because it still would
be considered valid for a subset of revisions in the repo).
- If all commits on a branch are obsolete, the branchcache will include that
branch, but the list of heads will be empty (that's why there's now `if not
heads` when recomputing tiprev/tipnode from cache contents). Having an entry
for every branch is currently required for notify extension (and
test-notify.t to pass), because notify doesn't handle revsets in its
subscription config very well and will throw an error if e.g. a branch
doesn't exist.
- Cloning static HTTP repos may try to stat() a non-existent obsstore file. The
issue is that we now care about obsolescence during clone, but statichttpvfs
doesn't implement a stat method, so a regular vfs.stat() is used, and it
assumes that file is local and calls os.stat(). During a clone, we're trying
to stat() .hg/store/obsstore, but in static HTTP case we provide a literal
URL to the obsstore file on the remote as if it were a local file path. On
windows it actually results in a failure in test-static-http.t.
The first issue is going to be addressed in a series dedicated to making sure
branchcache is properly and timely written on disk (it wasn't perfect even
before this patch, but there aren't enough tests to demonstrate that). The
second issue will be addressed in a future patch for notify extension that will
make it not raise an exception if a branch doesn't exist. And the third one was
partially addressed in the previous patch in this series and will be properly
fixed in a future patch when this series is accepted.
filteredhash() grows a keyword argument to make sure that branchcache is also
invalidated when there are new obsolete revisions in its repo view. This way
the on-disk cache format is unchanged and compatible between versions (although
it will obviously be recomputed when switching versions before/after this patch
and the repo has obsolete revisions).
There's one test that uses plain `hg up` without arguments while updated to a
pruned commit. To make this test pass, simply return current working directory
parent. Later in this series this code will be replaced by what prune command
does: updating to the closest non-obsolete ancestor.
Test changes:
test-branch-change.t: update branch head and cache update message. The head of
default listed in hg heads is changed because revision 2 was rewritten as 7,
and 1 is the closest ancestor on the same branch, so it's the head of default
now.
The cache invalidation message appears now because of the cache hash change,
since we're now accounting for obsolete revisions. Here's some context:
"served.hidden" repo filter means everything is visible (no filtered
revisions), so before this series branch2-served.hidden file would not contain
any cache hash, only revnum and node. Now it also has a hash when there are
obsolete changesets in the repo. The command that the message appears for is
changing branch of 5 and 6, which are now obsolete, so the cache hash changes.
In general, when cache is simply out-of-date, it can be updated using the old
version as a base. But if cache hash differs, then the cache for that
particular repo filter is recomputed (at least with the current
implementation). This is what happens here.
test-obsmarker-template.t: the pull reports 2 heads changed, but after that the
repo correctly sees only 1. The new message could be better, but it's still an
improvement over the previous one where hg pull suggested merging with an
obsolete revision.
test-obsolete.t: we can see these revisions in hg log --hidden, but they
shouldn't be considered heads even with --hidden.
test-rebase-obsolete{,2}.t: there were new heads created previously after
making new orphan changesets, but they weren't detected. Now we are properly
detecting and reporting them.
test-rebase-obsolete4.t: there's only one head now because the other head is
pruned and was falsely reported before.
test-static-http.t: add obsstore to the list of requested files. This file
doesn't exist on the remotes, but clients want it anyway (they get 404). This
is fine, because there are other nonexistent files that clients request, like
.hg/bookmarks or .hg/cache/tags2-served.
Differential Revision: https://phab.mercurial-scm.org/D12097
author | Anton Shestakov <av6@dwimlabs.net> |
---|---|
date | Fri, 07 Jan 2022 11:53:23 +0300 |
parents | 52034c42c09d |
children | 6000f5b25c9b |
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# unionrepo.py - repository class for viewing union of repository changesets # # Derived from bundlerepo.py # Copyright 2006, 2007 Benoit Boissinot <bboissin@gmail.com> # Copyright 2013 Unity Technologies, Mads Kiilerich <madski@unity3d.com> # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. """Repository class for "in-memory pull" of one local repository to another, allowing operations like diff and log with revsets. """ from __future__ import absolute_import from .i18n import _ from .pycompat import getattr from . import ( changelog, cmdutil, encoding, error, filelog, localrepo, manifest, mdiff, pathutil, revlog, util, vfs as vfsmod, ) from .revlogutils import ( constants as revlog_constants, ) class unionrevlog(revlog.revlog): def __init__(self, opener, radix, revlog2, linkmapper): # How it works: # To retrieve a revision, we just need to know the node id so we can # look it up in revlog2. # # To differentiate a rev in the second revlog from a rev in the revlog, # we check revision against repotiprev. opener = vfsmod.readonlyvfs(opener) target = getattr(revlog2, 'target', None) if target is None: # a revlog wrapper, eg: the manifestlog that is not an actual revlog target = revlog2._revlog.target revlog.revlog.__init__(self, opener, target=target, radix=radix) self.revlog2 = revlog2 n = len(self) self.repotiprev = n - 1 self.bundlerevs = set() # used by 'bundle()' revset expression for rev2 in self.revlog2: rev = self.revlog2.index[rev2] # rev numbers - in revlog2, very different from self.rev ( _start, _csize, rsize, base, linkrev, p1rev, p2rev, node, _sdo, _sds, _dcm, _sdcm, rank, ) = rev flags = _start & 0xFFFF if linkmapper is None: # link is to same revlog assert linkrev == rev2 # we never link back link = n else: # rev must be mapped from repo2 cl to unified cl by linkmapper link = linkmapper(linkrev) if linkmapper is not None: # link is to same revlog base = linkmapper(base) this_rev = self.index.get_rev(node) if this_rev is not None: # this happens for the common revlog revisions self.bundlerevs.add(this_rev) continue p1node = self.revlog2.node(p1rev) p2node = self.revlog2.node(p2rev) # TODO: it's probably wrong to set compressed length to -1, but # I have no idea if csize is valid in the base revlog context. e = ( flags, -1, rsize, base, link, self.rev(p1node), self.rev(p2node), node, 0, # sidedata offset 0, # sidedata size revlog_constants.COMP_MODE_INLINE, revlog_constants.COMP_MODE_INLINE, rank, ) self.index.append(e) self.bundlerevs.add(n) n += 1 def _chunk(self, rev): if rev <= self.repotiprev: return revlog.revlog._chunk(self, rev) return self.revlog2._chunk(self.node(rev)) def revdiff(self, rev1, rev2): """return or calculate a delta between two revisions""" if rev1 > self.repotiprev and rev2 > self.repotiprev: return self.revlog2.revdiff( self.revlog2.rev(self.node(rev1)), self.revlog2.rev(self.node(rev2)), ) elif rev1 <= self.repotiprev and rev2 <= self.repotiprev: return super(unionrevlog, self).revdiff(rev1, rev2) return mdiff.textdiff(self.rawdata(rev1), self.rawdata(rev2)) def _revisiondata(self, nodeorrev, _df=None, raw=False): if isinstance(nodeorrev, int): rev = nodeorrev node = self.node(rev) else: node = nodeorrev rev = self.rev(node) if rev > self.repotiprev: # work around manifestrevlog NOT being a revlog revlog2 = getattr(self.revlog2, '_revlog', self.revlog2) func = revlog2._revisiondata else: func = super(unionrevlog, self)._revisiondata return func(node, _df=_df, raw=raw) def addrevision(self, text, transaction, link, p1=None, p2=None, d=None): raise NotImplementedError def addgroup( self, deltas, linkmapper, transaction, alwayscache=False, addrevisioncb=None, duplicaterevisioncb=None, maybemissingparents=False, ): raise NotImplementedError def strip(self, minlink, transaction): raise NotImplementedError def checksize(self): raise NotImplementedError class unionchangelog(unionrevlog, changelog.changelog): def __init__(self, opener, opener2): changelog.changelog.__init__(self, opener) linkmapper = None changelog2 = changelog.changelog(opener2) unionrevlog.__init__(self, opener, self.radix, changelog2, linkmapper) class unionmanifest(unionrevlog, manifest.manifestrevlog): def __init__(self, nodeconstants, opener, opener2, linkmapper): manifest.manifestrevlog.__init__(self, nodeconstants, opener) manifest2 = manifest.manifestrevlog(nodeconstants, opener2) unionrevlog.__init__( self, opener, self._revlog.radix, manifest2, linkmapper ) class unionfilelog(filelog.filelog): def __init__(self, opener, path, opener2, linkmapper, repo): filelog.filelog.__init__(self, opener, path) filelog2 = filelog.filelog(opener2, path) self._revlog = unionrevlog( opener, self._revlog.radix, filelog2._revlog, linkmapper ) self._repo = repo self.repotiprev = self._revlog.repotiprev self.revlog2 = self._revlog.revlog2 def iscensored(self, rev): """Check if a revision is censored.""" if rev <= self.repotiprev: return filelog.filelog.iscensored(self, rev) node = self.node(rev) return self.revlog2.iscensored(self.revlog2.rev(node)) class unionpeer(localrepo.localpeer): def canpush(self): return False class unionrepository(object): """Represents the union of data in 2 repositories. Instances are not usable if constructed directly. Use ``instance()`` or ``makeunionrepository()`` to create a usable instance. """ def __init__(self, repo2, url): self.repo2 = repo2 self._url = url self.ui.setconfig(b'phases', b'publish', False, b'unionrepo') @localrepo.unfilteredpropertycache def changelog(self): return unionchangelog(self.svfs, self.repo2.svfs) @localrepo.unfilteredpropertycache def manifestlog(self): rootstore = unionmanifest( self.nodeconstants, self.svfs, self.repo2.svfs, self.unfiltered()._clrev, ) return manifest.manifestlog( self.svfs, self, rootstore, self.narrowmatch() ) def _clrev(self, rev2): """map from repo2 changelog rev to temporary rev in self.changelog""" node = self.repo2.changelog.node(rev2) return self.changelog.rev(node) def url(self): return self._url def file(self, f): return unionfilelog( self.svfs, f, self.repo2.svfs, self.unfiltered()._clrev, self ) def close(self): self.repo2.close() def cancopy(self): return False def peer(self): return unionpeer(self) def getcwd(self): return encoding.getcwd() # always outside the repo def instance(ui, path, create, intents=None, createopts=None): if create: raise error.Abort(_(b'cannot create new union repository')) parentpath = ui.config(b"bundle", b"mainreporoot") if not parentpath: # try to find the correct path to the working directory repo parentpath = cmdutil.findrepo(encoding.getcwd()) if parentpath is None: parentpath = b'' if parentpath: # Try to make the full path relative so we get a nice, short URL. # In particular, we don't want temp dir names in test outputs. cwd = encoding.getcwd() if parentpath == cwd: parentpath = b'' else: cwd = pathutil.normasprefix(cwd) if parentpath.startswith(cwd): parentpath = parentpath[len(cwd) :] if path.startswith(b'union:'): s = path.split(b":", 1)[1].split(b"+", 1) if len(s) == 1: repopath, repopath2 = parentpath, s[0] else: repopath, repopath2 = s else: repopath, repopath2 = parentpath, path return makeunionrepository(ui, repopath, repopath2) def makeunionrepository(ui, repopath1, repopath2): """Make a union repository object from 2 local repo paths.""" repo1 = localrepo.instance(ui, repopath1, create=False) repo2 = localrepo.instance(ui, repopath2, create=False) url = b'union:%s+%s' % ( util.expandpath(repopath1), util.expandpath(repopath2), ) class derivedunionrepository(unionrepository, repo1.__class__): pass repo = repo1 repo.__class__ = derivedunionrepository unionrepository.__init__(repo1, repo2, url) return repo