rust-hg-core: move from `ouroboros` to `self_cell`
`ouroboros` has a fundamental soundness problem that, while not applicable
today, could become applicable given new compiler optimizations.ยน
`self_cell` is a crate that accomplishes a lot of the same things that
`ouroboros` did while remaining sound (that is, unless a new soundness issue
is discovered) by not assuming as much about the memory layout of the program.
`self_cell` has been scrutinized heavily in the past few months by very
competent people, some from the compiler team and has shown no weaknesses
for a while, with a 1.0 stable release coming out a couple months ago.
Our internal API is exactly the same, this is just an implementation detail.
To reiterate, no actual soundness issue was found with our use of `ouroboros`,
but there might be evolutions of `rustc` (or even a future separate compiler)
that could generate unsound code.
[1] https://github.com/joshua-maros/ouroboros/issues/88
Make a narrow clone then archive it
$ . "$TESTDIR/narrow-library.sh"
$ hg init master
$ cd master
$ for x in `$TESTDIR/seq.py 3`; do
> echo $x > "f$x"
> hg add "f$x"
> hg commit -m "Add $x"
> done
$ cat >> .hg/hgrc << EOF
> [narrowacl]
> default.includes=f1 f2
> EOF
$ hg serve -a localhost -p $HGPORT1 -d --pid-file=hg.pid
$ cat hg.pid >> "$DAEMON_PIDS"
$ cd ..
$ hg clone http://localhost:$HGPORT1 narrowclone1
requesting all changes
adding changesets
adding manifests
adding file changes
added 3 changesets with 2 changes to 2 files
new changesets * (glob)
updating to branch default
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
The clone directory should only contain f1 and f2
$ ls -A -1 narrowclone1 | sort
.hg
f1
f2
Requirements should contain narrowhg
$ hg debugrequires -R narrowclone1 | grep narrowhg
narrowhg-experimental
NarrowHG should track f1 and f2
$ hg -R narrowclone1 tracked
I path:f1
I path:f2
Narrow should not be able to widen to include f3
$ hg -R narrowclone1 tracked --addinclude f3
comparing with http://localhost:$HGPORT1/
searching for changes
abort: The following includes are not accessible for test: ['path:f3']
[255]
$ ls -A -1 narrowclone1 | sort
.hg
f1
f2
$ hg -R narrowclone1 tracked
I path:f1
I path:f2
Narrow should allow widen to include f2
$ hg -R narrowclone1 tracked --removeinclude f2 > /dev/null
$ hg -R narrowclone1 tracked
I path:f1
$ ls -A -1 narrowclone1 | sort
.hg
f1
$ hg -R narrowclone1 tracked --addinclude f2
comparing with http://localhost:$HGPORT1/
searching for changes
adding changesets
adding manifests
adding file changes
added 0 changesets with 1 changes to 1 files
$ hg -R narrowclone1 tracked
I path:f1
I path:f2
$ ls -A -1 narrowclone1 | sort
.hg
f1
f2