outgoing: rework the handling of the `missingroots` case to be faster
The previous implementation was slow, to the point it was taking a significant
amount of `hg bundle --type none-streamv2` call. We rework the code to compute
the same value much faster, making the operation disappear from the `hg bundle
--type none-streamv2` profile. Someone would remark that producing a streamclone
does not requires an `outgoing` object. However that is a matter for another
day. There is other user of `missingroots` (non stream `hg bundle` call for
example), and they will also benefit from this rework.
We implement an old TODO in the process, directly computing the missing and
common attribute as we have most element at hand already.
### benchmark.name = hg.command.bundle
# bin-env-vars.hg.flavor = default
# bin-env-vars.hg.py-re2-module = default
# benchmark.variants.revs = all
# benchmark.variants.type = none-streamv2
## data-env-vars.name = heptapod-public-2024-03-25-zstd-sparse-revlog
before: 7.750458
after: 6.665565 (-14.00%, -1.08)
## data-env-vars.name = mercurial-public-2024-03-22-zstd-sparse-revlog
before: 0.700229
after: 0.496050 (-29.16%, -0.20)
## data-env-vars.name = mozilla-try-2023-03-22-zstd-sparse-revlog
before: 346.508952
after: 316.749699 (-8.59%, -29.76)
## data-env-vars.name = pypy-2024-03-22-zstd-sparse-revlog
before: 3.401700
after: 2.915810 (-14.28%, -0.49)
## data-env-vars.name = tryton-public-2024-03-22-zstd-sparse-revlog
before: 1.870798
after: 1.461583 (-21.87%, -0.41)
note: this whole `missingroots` of outgoing has a limited number of callers and
could likely be replace by something simpler (like taking an explicit
"missing_revs" set for example). However this is a wider change and we focus on
a small impact, quick rework that does not change the API for now.
#testcases continuecommand continueflag
#if continueflag
$ cat >> $HGRCPATH <<EOF
> [alias]
> continue = rebase --continue
> EOF
#endif
$ . "$TESTDIR/narrow-library.sh"
create full repo
$ hg init master
$ cd master
$ mkdir inside
$ echo inside1 > inside/f1
$ echo inside2 > inside/f2
$ mkdir outside
$ echo outside1 > outside/f1
$ echo outside2 > outside/f2
$ hg ci -Aqm 'initial'
$ echo modified > inside/f1
$ hg ci -qm 'modify inside/f1'
$ hg update -q 0
$ echo modified2 > inside/f2
$ hg ci -qm 'modify inside/f2'
$ hg update -q 0
$ echo modified > outside/f1
$ hg ci -qm 'modify outside/f1'
$ hg update -q 0
$ echo modified2 > outside/f1
$ hg ci -qm 'conflicting outside/f1'
$ cd ..
$ hg clone --narrow ssh://user@dummy/master narrow --include inside
requesting all changes
adding changesets
adding manifests
adding file changes
added 5 changesets with 4 changes to 2 files (+3 heads)
new changesets *:* (glob)
updating to branch default
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cd narrow
$ cat >> $HGRCPATH <<EOF
> [extensions]
> rebase=
> EOF
$ hg update -q 0
Can rebase onto commit where no files outside narrow spec are involved
$ hg update -q 0
$ echo modified > inside/f2
$ hg ci -qm 'modify inside/f2'
$ hg rebase -d 'desc("modify inside/f1")'
rebasing 5:c2f36d04e05d tip "modify inside/f2"
saved backup bundle to $TESTTMP/narrow/.hg/strip-backup/*-rebase.hg (glob)
Can rebase onto conflicting changes inside narrow spec
$ hg update -q 0
$ echo conflicting > inside/f1
$ hg ci -qm 'conflicting inside/f1'
$ hg rebase -d 'desc("modify inside/f1")' 2>&1 | grep -E -v '(warning:|incomplete!)'
rebasing 6:cdce97fbf653 tip "conflicting inside/f1"
merging inside/f1
unresolved conflicts (see 'hg resolve', then 'hg rebase --continue')
$ echo modified3 > inside/f1
$ hg resolve -m 2>&1 | grep -v continue:
(no more unresolved files)
$ hg continue
rebasing 6:cdce97fbf653 tip "conflicting inside/f1"
saved backup bundle to $TESTTMP/narrow/.hg/strip-backup/*-rebase.hg (glob)
Can rebase onto non-conflicting changes outside narrow spec
$ hg update -q 0
$ echo modified > inside/f2
$ hg ci -qm 'modify inside/f2'
$ hg rebase -d 'desc("modify outside/f1")'
rebasing 7:c2f36d04e05d tip "modify inside/f2"
saved backup bundle to $TESTTMP/narrow/.hg/strip-backup/*-rebase.hg (glob)
Rebase interrupts on conflicting changes outside narrow spec
$ hg update -q 'desc("conflicting outside/f1")'
$ hg phase -f -d .
$ hg rebase -d 'desc("modify outside/f1")'
rebasing 4:707c035aadb6 "conflicting outside/f1"
abort: conflict in file 'outside/f1' is outside narrow clone
[20]