Mercurial > public > mercurial-scm > hg
diff mercurial/sparse.py @ 42456:87a34c767384
merge: fix race that could cause wrong size in dirstate
The problem is that hg merge/update/etc work the following way:
1. figure out what files to update
2. apply the update to disk
3. apply the update to in-memory dirstate
4. write dirstate
where step3 looks at the filesystem and assumes it sees the result of
step2. If a file is changed between step2 and step3, step3 will record
incorrect information in the dirstate.
I avoid this by passing the size step3 needs directly from step2, for
the common path (not implemented for change/delete conflicts for
instance).
I didn't fix the same race for the exec bit for now, because it's less
likely to be problematic and I had trouble due to the fact that the
dirstate stores the permissions differently from the manifest (st_mode
vs '' 'l' 'x'), in combination with tests that pretend that symlinks
are not supported.
However, I moved the lstat from step3 to step2, which should tighten
the race window markedly, both for the exec bit and for the mtime.
Differential Revision: https://phab.mercurial-scm.org/D6475
| author | Valentin Gatien-Baron <valentin.gatienbaron@gmail.com> |
|---|---|
| date | Mon, 27 May 2019 16:55:46 -0400 |
| parents | aaad36b88298 |
| children | 2372284d9457 |
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--- a/mercurial/sparse.py Wed Jun 12 13:10:52 2019 -0400 +++ b/mercurial/sparse.py Mon May 27 16:55:46 2019 -0400 @@ -248,7 +248,8 @@ typeactions = mergemod.emptyactions() typeactions['r'] = actions - mergemod.applyupdates(repo, typeactions, repo[None], repo['.'], False) + mergemod.applyupdates(repo, typeactions, repo[None], repo['.'], False, + wantfiledata=False) # Fix dirstate for file in dropped: @@ -382,7 +383,7 @@ typeactions = mergemod.emptyactions() typeactions['g'] = actions mergemod.applyupdates(repo, typeactions, repo[None], repo['.'], - False) + False, wantfiledata=False) dirstate = repo.dirstate for file, flags, msg in actions: @@ -486,7 +487,8 @@ for f, (m, args, msg) in actions.iteritems(): typeactions[m].append((f, args, msg)) - mergemod.applyupdates(repo, typeactions, repo[None], repo['.'], False) + mergemod.applyupdates(repo, typeactions, repo[None], repo['.'], False, + wantfiledata=False) # Fix dirstate for file in added: