rust-index: optimize find_gca_candidates() on less than 8 revisions
This is expected to be by far the most common case, given that, e.g.,
merging involves using it on two revisions.
Using a `u8` as support for the bitset obviously divides the amount of
RAM needed by 8. To state the obvious, on a repository with 10 million
changesets, this spares 70MB. It is also possible that it'd be slightly
faster, because it is easier to allocate and provides better cache locality.
It is possible that some exhaustive listing of the traits implemented by
`u8` and `u64` would avoid the added duplication, but that can be done later
and would need a replacement for the `MAX` consts.
#testcases dirstate-v1 dirstate-v2
#if dirstate-v2
$ cat >> $HGRCPATH << EOF
> [format]
> use-dirstate-v2=1
> [storage]
> dirstate-v2.slow-path=allow
> EOF
#endif
Checking the size/permissions/file-type of files stored in the
dirstate after an update where the files are changed concurrently
outside of hg's control.
$ hg init repo
$ cd repo
$ echo a > a
$ hg commit -qAm _
$ echo aa > a
$ hg commit -m _
# this sleep is there to ensure current time has -at-least- one second away
# from the current time. It ensure the mtime is not ambiguous. If the test
# "sleep" longer this will be fine.
# It is not used to synchronise parallele operation so it is "fine" to use it.
$ sleep 1
$ hg status
$ hg debugdirstate --no-dates
n 644 3 (set |unset) a (re)
$ cat >> $TESTTMP/dirstaterace.py << EOF
> import time
> from mercurial import (
> commit,
> extensions,
> merge,
> )
> def extsetup(ui):
> extensions.wrapfunction(merge, 'applyupdates', wrap(0))
> extensions.wrapfunction(commit, 'commitctx', wrap(1))
> def wrap(duration):
> def new(orig, *args, **kwargs):
> res = orig(*args, **kwargs)
> with open("a", "w"):
> pass # just truncate the file
> time.sleep(duration)
> return res
> return new
> EOF
Do an update where file 'a' is changed between hg writing it to disk
and hg writing the dirstate. The dirstate is correct nonetheless, and
so hg status correctly shows a as clean.
$ hg up -r 0 --config extensions.race=$TESTTMP/dirstaterace.py
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg debugdirstate --no-dates
n 644 2 (set |unset) a (re)
$ echo a > a; hg status; hg diff
Do a commit where file 'a' is changed between hg committing its new
revision into the repository, and the writing of the dirstate.
This used to results in a corrupted dirstate (size did not match committed size).
$ echo aaa > a; hg commit -qm _
$ hg merge -qr 1; hg resolve -m; rm a.orig
warning: conflicts while merging a! (edit, then use 'hg resolve --mark')
(no more unresolved files)
$ cat a
<<<<<<< working copy: be46f74ce38d - test: _
aaa
=======
aa
>>>>>>> merge rev: eb3fc6c17aa3 - test: _
$ hg debugdirstate --no-dates
m 0 -2 (set |unset) a (re)
$ hg commit -m _ --config extensions.race=$TESTTMP/dirstaterace.py
$ hg debugdirstate --no-dates
n 0 -1 unset a
$ cat a | wc -c
*0 (re)
$ hg cat -r . a | wc -c
*105 (re)
$ hg status; hg diff --stat
M a
a | 5 -----
1 files changed, 0 insertions(+), 5 deletions(-)