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view tests/test-bundle-r.t @ 49000:dd6b67d5c256 stable
rust: fix unsound `OwningDirstateMap`
As per the previous patch, `OwningDirstateMap` is unsound. Self-referential
structs are difficult to implement correctly in Rust since the compiler is
free to move structs around as much as it wants to. They are also very rarely
needed in practice, so the state-of-the-art on how they should be done within
the Rust rules is still a bit new.
The crate `ouroboros` is an attempt at providing a safe way (in the Rust sense)
of declaring self-referential structs. It is getting a lot attention and was
improved very quickly when soundness issues were found in the past: rather than
relying on our own (limited) review circle, we might as well use the de-facto
common crate to fix this problem. This will give us a much better chance of
finding issues should any new ones be discovered as well as the benefit of
fewer `unsafe` APIs of our own.
I was starting to think about how I would present a safe API to the old struct
but soon realized that the callback-based approach was already done in
`ouroboros`, along with a lot more care towards refusing incorrect structs.
In short: we don't return a mutable reference to the `DirstateMap` anymore, we
expect users of its API to pass a `FnOnce` that takes the map as an argument.
This allows our `OwningDirstateMap` to control the input and output lifetimes
of the code that modifies it to prevent such issues.
Changing to `ouroboros` meant changing every API with it, but it is relatively
low churn in the end. It correctly identified the example buggy modification of
`copy_map_insert` outlined in the previous patch as violating the borrow rules.
Differential Revision: https://phab.mercurial-scm.org/D12429
author | Raphaël Gomès <rgomes@octobus.net> |
---|---|
date | Tue, 05 Apr 2022 10:55:28 +0200 |
parents | 96ee8ca99f5a |
children | 2f2682f40ea0 |
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$ hg init test $ cd test $ hg unbundle "$TESTDIR/bundles/remote.hg" adding changesets adding manifests adding file changes added 9 changesets with 7 changes to 4 files (+1 heads) new changesets bfaf4b5cbf01:916f1afdef90 (9 drafts) (run 'hg heads' to see heads, 'hg merge' to merge) $ hg up tip 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ cd .. $ for i in 0 1 2 3 4 5 6 7 8; do > mkdir test-"$i" > hg --cwd test-"$i" init > hg -R test bundle -r "$i" test-"$i".hg test-"$i" > cd test-"$i" > hg unbundle ../test-"$i".hg > hg verify > hg tip -q > cd .. > done searching for changes 1 changesets found adding changesets adding manifests adding file changes added 1 changesets with 1 changes to 1 files new changesets bfaf4b5cbf01 (1 drafts) (run 'hg update' to get a working copy) checking changesets checking manifests crosschecking files in changesets and manifests checking files checked 1 changesets with 1 changes to 1 files 0:bfaf4b5cbf01 searching for changes 2 changesets found adding changesets adding manifests adding file changes added 2 changesets with 2 changes to 1 files new changesets bfaf4b5cbf01:21f32785131f (2 drafts) (run 'hg update' to get a working copy) checking changesets checking manifests crosschecking files in changesets and manifests checking files checked 2 changesets with 2 changes to 1 files 1:21f32785131f searching for changes 3 changesets found adding changesets adding manifests adding file changes added 3 changesets with 3 changes to 1 files new changesets bfaf4b5cbf01:4ce51a113780 (3 drafts) (run 'hg update' to get a working copy) checking changesets checking manifests crosschecking files in changesets and manifests checking files checked 3 changesets with 3 changes to 1 files 2:4ce51a113780 searching for changes 4 changesets found adding changesets adding manifests adding file changes added 4 changesets with 4 changes to 1 files new changesets bfaf4b5cbf01:93ee6ab32777 (4 drafts) (run 'hg update' to get a working copy) checking changesets checking manifests crosschecking files in changesets and manifests checking files checked 4 changesets with 4 changes to 1 files 3:93ee6ab32777 searching for changes 2 changesets found adding changesets adding manifests adding file changes added 2 changesets with 2 changes to 1 files new changesets bfaf4b5cbf01:c70afb1ee985 (2 drafts) (run 'hg update' to get a working copy) checking changesets checking manifests crosschecking files in changesets and manifests checking files checked 2 changesets with 2 changes to 1 files 1:c70afb1ee985 searching for changes 3 changesets found adding changesets adding manifests adding file changes added 3 changesets with 3 changes to 1 files new changesets bfaf4b5cbf01:f03ae5a9b979 (3 drafts) (run 'hg update' to get a working copy) checking changesets checking manifests crosschecking files in changesets and manifests checking files checked 3 changesets with 3 changes to 1 files 2:f03ae5a9b979 searching for changes 4 changesets found adding changesets adding manifests adding file changes added 4 changesets with 5 changes to 2 files new changesets bfaf4b5cbf01:095cb14b1b4d (4 drafts) (run 'hg update' to get a working copy) checking changesets checking manifests crosschecking files in changesets and manifests checking files checked 4 changesets with 5 changes to 2 files 3:095cb14b1b4d searching for changes 5 changesets found adding changesets adding manifests adding file changes added 5 changesets with 6 changes to 3 files new changesets bfaf4b5cbf01:faa2e4234c7a (5 drafts) (run 'hg update' to get a working copy) checking changesets checking manifests crosschecking files in changesets and manifests checking files checked 5 changesets with 6 changes to 3 files 4:faa2e4234c7a searching for changes 5 changesets found adding changesets adding manifests adding file changes added 5 changesets with 5 changes to 2 files new changesets bfaf4b5cbf01:916f1afdef90 (5 drafts) (run 'hg update' to get a working copy) checking changesets checking manifests crosschecking files in changesets and manifests checking files checked 5 changesets with 5 changes to 2 files 4:916f1afdef90 $ cd test-8 $ hg pull ../test-7 pulling from ../test-7 searching for changes adding changesets adding manifests adding file changes added 4 changesets with 2 changes to 3 files (+1 heads) new changesets c70afb1ee985:faa2e4234c7a 1 local changesets published (run 'hg heads' to see heads, 'hg merge' to merge) $ hg verify checking changesets checking manifests crosschecking files in changesets and manifests checking files checked 9 changesets with 7 changes to 4 files $ hg rollback repository tip rolled back to revision 4 (undo pull) $ cd .. should fail $ hg -R test bundle --base 2 -r tip test-bundle-branch1.hg test-3 abort: --base is incompatible with specifying destinations [10] $ hg -R test bundle -a -r tip test-bundle-branch1.hg test-3 abort: --all is incompatible with specifying destinations [10] $ hg -R test bundle -r tip test-bundle-branch1.hg config error: default repository not configured! (see 'hg help config.paths') [30] $ hg -R test bundle --base 2 -r tip test-bundle-branch1.hg 2 changesets found $ hg -R test bundle --base 2 -r 7 test-bundle-branch2.hg 4 changesets found $ hg -R test bundle --base 2 test-bundle-all.hg 6 changesets found $ hg -R test bundle --base 2 --all test-bundle-all-2.hg ignoring --base because --all was specified 9 changesets found $ hg -R test bundle --base 3 -r tip test-bundle-should-fail.hg 1 changesets found empty bundle $ hg -R test bundle --base 7 --base 8 test-bundle-empty.hg no changes found [1] issue76 msg2163 $ hg -R test bundle --base 3 -r 3 -r 3 test-bundle-cset-3.hg no changes found [1] Issue1910: 'hg bundle --base $head' does not exclude $head from result $ hg -R test bundle --base 7 test-bundle-cset-7.hg 4 changesets found $ hg clone test-2 test-9 updating to branch default 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ cd test-9 revision 2 $ hg tip -q 2:4ce51a113780 $ hg unbundle ../test-bundle-should-fail.hg adding changesets transaction abort! rollback completed abort: 00changelog@93ee6ab32777cd430e07da694794fb6a4f917712: unknown parent [50] revision 2 $ hg tip -q 2:4ce51a113780 $ hg unbundle ../test-bundle-all.hg adding changesets adding manifests adding file changes added 6 changesets with 4 changes to 4 files (+1 heads) new changesets 93ee6ab32777:916f1afdef90 (6 drafts) (run 'hg heads' to see heads, 'hg merge' to merge) revision 8 $ hg tip -q 8:916f1afdef90 $ hg verify checking changesets checking manifests crosschecking files in changesets and manifests checking files checked 9 changesets with 7 changes to 4 files $ hg rollback repository tip rolled back to revision 2 (undo unbundle) revision 2 $ hg tip -q 2:4ce51a113780 $ hg unbundle ../test-bundle-branch1.hg adding changesets adding manifests adding file changes added 2 changesets with 2 changes to 2 files new changesets 93ee6ab32777:916f1afdef90 (2 drafts) (run 'hg update' to get a working copy) revision 4 $ hg tip -q 4:916f1afdef90 $ hg verify checking changesets checking manifests crosschecking files in changesets and manifests checking files checked 5 changesets with 5 changes to 2 files $ hg rollback repository tip rolled back to revision 2 (undo unbundle) $ hg unbundle ../test-bundle-branch2.hg adding changesets adding manifests adding file changes added 4 changesets with 3 changes to 3 files (+1 heads) new changesets c70afb1ee985:faa2e4234c7a (4 drafts) (run 'hg heads' to see heads, 'hg merge' to merge) revision 6 $ hg tip -q 6:faa2e4234c7a $ hg verify checking changesets checking manifests crosschecking files in changesets and manifests checking files checked 7 changesets with 6 changes to 3 files $ hg rollback repository tip rolled back to revision 2 (undo unbundle) $ hg unbundle ../test-bundle-cset-7.hg adding changesets adding manifests adding file changes added 2 changesets with 2 changes to 2 files new changesets 93ee6ab32777:916f1afdef90 (2 drafts) (run 'hg update' to get a working copy) revision 4 $ hg tip -q 4:916f1afdef90 $ hg verify checking changesets checking manifests crosschecking files in changesets and manifests checking files checked 5 changesets with 5 changes to 2 files $ cd ../test $ hg merge 7 note: possible conflict - afile was renamed multiple times to: adifferentfile anotherfile 2 files updated, 0 files merged, 0 files removed, 0 files unresolved (branch merge, don't forget to commit) $ hg ci -m merge $ cd .. $ hg -R test bundle --base 2 test-bundle-head.hg 7 changesets found $ hg clone test-2 test-10 updating to branch default 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ cd test-10 $ hg unbundle ../test-bundle-head.hg adding changesets adding manifests adding file changes added 7 changesets with 4 changes to 4 files new changesets 93ee6ab32777:03fc0b0e347c (7 drafts) (run 'hg update' to get a working copy) revision 9 $ hg tip -q 9:03fc0b0e347c $ hg verify checking changesets checking manifests crosschecking files in changesets and manifests checking files checked 10 changesets with 7 changes to 4 files $ cd ..