rust-index: using the `hg::index::Index` in ancestors iterator and lazy set
Since there is no Rust implementation for REVLOGV2/CHANGELOGv2, we declare
them to be incompatible with Rust, hence indexes in these formats will use
the implementations from Python `mercurial.ancestor`. If this is an unacceptable
performance hit for current users of these formats, we can later on add Rust
implementations based on the C index for them or implement these formats for
the Rust indexes.
Among the challenges that we had to meet, we wanted to avoid taking the GIL each
time the inner (vcsgraph) iterator has to call the parents function. This would probably
still be acceptable in terms of performance with `AncestorsIterator`, but not with
`LazyAncestors` nor for the upcoming change in `MissingAncestors`.
Hence we enclose the reference to the index in a `PySharedRef`, leading to more
rigourous checking of mutations, which does pass now that there no logically immutable
methods of `hg::index::Index` that take a mutable reference as input.
===============================
Test the "tracked hint" feature
===============================
The tracked hint feature provide a file that get updated when the set of tracked
files get updated.
basic setup
$ cat << EOF >> $HGRCPATH
> [format]
> use-dirstate-tracked-hint=yes
> EOF
$ hg init tracked-hint-test
$ cd tracked-hint-test
$ hg debugbuilddag '.+10' -n
$ hg log -G -T '{rev} {desc} {files}\n'
o 10 r10 nf10
|
o 9 r9 nf9
|
o 8 r8 nf8
|
o 7 r7 nf7
|
o 6 r6 nf6
|
o 5 r5 nf5
|
o 4 r4 nf4
|
o 3 r3 nf3
|
o 2 r2 nf2
|
o 1 r1 nf1
|
o 0 r0 nf0
$ hg up tip
11 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg files
nf0
nf1
nf10
nf2
nf3
nf4
nf5
nf6
nf7
nf8
nf9
key-file exists
-----------
The tracked hint file should exist
$ ls -1 .hg/dirstate*
.hg/dirstate
.hg/dirstate-tracked-hint
key-file stay the same if the tracked set is unchanged
------------------------------------------------------
(copy its content for later comparison)
$ cp .hg/dirstate-tracked-hint ../key-bck
$ echo foo >> nf0
$ sleep 1
$ hg status
M nf0
$ diff --brief .hg/dirstate-tracked-hint ../key-bck
$ hg revert -C nf0
$ sleep 1
$ hg status
$ diff --brief .hg/dirstate-tracked-hint ../key-bck
key-file change if the tracked set is changed manually
------------------------------------------------------
adding a file to tracking
$ cp .hg/dirstate-tracked-hint ../key-bck
$ echo x > x
$ hg add x
$ diff --brief .hg/dirstate-tracked-hint ../key-bck
Files .hg/dirstate-tracked-hint and ../key-bck differ
[1]
remove a file from tracking
(forget)
$ cp .hg/dirstate-tracked-hint ../key-bck
$ hg forget x
$ diff --brief .hg/dirstate-tracked-hint ../key-bck
Files .hg/dirstate-tracked-hint and ../key-bck differ
[1]
(remove)
$ cp .hg/dirstate-tracked-hint ../key-bck
$ hg remove nf1
$ diff --brief .hg/dirstate-tracked-hint ../key-bck
Files .hg/dirstate-tracked-hint and ../key-bck differ
[1]
key-file changes on revert (when applicable)
--------------------------------------------
$ cp .hg/dirstate-tracked-hint ../key-bck
$ hg status
R nf1
? x
$ hg revert --all
undeleting nf1
$ hg status
? x
$ diff --brief .hg/dirstate-tracked-hint ../key-bck
Files .hg/dirstate-tracked-hint and ../key-bck differ
[1]
`hg update` does affect the key-file (when needed)
--------------------------------------------------
update changing the tracked set
(removing)
$ cp .hg/dirstate-tracked-hint ../key-bck
$ hg status --rev . --rev '.#generations[-1]'
R nf10
$ hg up '.#generations[-1]'
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ diff --brief .hg/dirstate-tracked-hint ../key-bck
Files .hg/dirstate-tracked-hint and ../key-bck differ
[1]
(adding)
$ cp .hg/dirstate-tracked-hint ../key-bck
$ hg status --rev . --rev '.#generations[1]'
A nf10
$ hg up '.#generations[1]'
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ diff --brief .hg/dirstate-tracked-hint ../key-bck
Files .hg/dirstate-tracked-hint and ../key-bck differ
[1]
update not affecting the tracked set
$ echo foo >> nf0
$ hg commit -m foo
$ cp .hg/dirstate-tracked-hint ../key-bck
$ hg status --rev . --rev '.#generations[-1]'
M nf0
$ hg up '.#generations[-1]'
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ diff --brief .hg/dirstate-tracked-hint ../key-bck
Test upgrade and downgrade
==========================
$ test -f .hg/dirstate-tracked-hint
$ hg debugrequires | grep 'tracked'
dirstate-tracked-key-v1
downgrade
$ hg debugupgraderepo --config format.use-dirstate-tracked-hint=no --run --quiet
upgrade will perform the following actions:
requirements
preserved: * (glob)
removed: dirstate-tracked-key-v1
no revlogs to process
$ test -f .hg/dirstate-tracked-hint
[1]
$ hg debugrequires | grep 'tracked'
[1]
upgrade
$ hg debugupgraderepo --config format.use-dirstate-tracked-hint=yes --run --quiet
upgrade will perform the following actions:
requirements
preserved: * (glob)
added: dirstate-tracked-key-v1
no revlogs to process
$ test -f .hg/dirstate-tracked-hint
$ hg debugrequires | grep 'tracked'
dirstate-tracked-key-v1
$ cd ..
Test automatic upgrade and downgrade
------------------------------------
create an initial repository
$ hg init auto-upgrade \
> --config format.use-dirstate-tracked-hint=no
$ hg debugbuilddag -R auto-upgrade --new-file .+5
$ hg -R auto-upgrade update
6 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg debugformat -R auto-upgrade | grep tracked
tracked-hint: no
upgrade it to dirstate-tracked-hint automatically
$ hg status -R auto-upgrade \
> --config format.use-dirstate-tracked-hint.automatic-upgrade-of-mismatching-repositories=yes \
> --config format.use-dirstate-tracked-hint=yes
automatically upgrading repository to the `tracked-hint` feature
(see `hg help config.format.use-dirstate-tracked-hint` for details)
$ hg debugformat -R auto-upgrade | grep tracked
tracked-hint: yes
rhg supports this feature
$ hg status -R auto-upgrade \
> --config format.use-dirstate-tracked-hint=yes --config rhg.on-unsupported=abort
downgrade it from dirstate-tracked-hint automatically
$ hg status -R auto-upgrade \
> --config format.use-dirstate-tracked-hint.automatic-upgrade-of-mismatching-repositories=yes \
> --config format.use-dirstate-tracked-hint=no
automatically downgrading repository from the `tracked-hint` feature
(see `hg help config.format.use-dirstate-tracked-hint` for details)
$ hg debugformat -R auto-upgrade | grep tracked
tracked-hint: no