hg-stable: Changelog

typing: add type hints to mercurial/error.py The only slightly unusual things here are that `location` is passed to `ParseError` and both bytes and an int (so this accepts both), and the message passed `ProgrammingError` is immediately converted to str. Therefore it is typed as `AnyStr`, because there are a couple of instances that are already passed as str. There are a couple of places where bytes are being passed to builtin exceptions that might need to be converted to str. Differential Revision: https://phab.mercurial-scm.org/D10274

tests: add a (very slow) test that executes pytype This is an updated form of D7295, and completes successfully with pytype 2021.03.22. The 5 or so crashes that were mostly in the hgweb files seems to have been fixed in 2021.03.10. Differential Revision: https://phab.mercurial-scm.org/D10237

upgrade: do not hardcore file extension of revlogs This logic already lives inside the `store` module. So lets reuse it instead. Differential Revision: https://phab.mercurial-scm.org/D10317

upgrade: take advantage of the new information returned by `store.walk` Before this change the upgrade code had to analyse filename to process them directly. Lets keep that logic private to the store and more to a more robust explicit approach. Differential Revision: https://phab.mercurial-scm.org/D10316

store: also return some information about the type of file `walk` found We start returning of 4th information in the `store.walk` return tuple: the type of the file. This will make it easier for caller to determine which kind of file they are looking at. This should especically help with the `upgrade-repo` code that has to do a lot of fragile index's file name comparison. Differential Revision: https://phab.mercurial-scm.org/D10315

tests: skip test-git-interop.t on Windows Casefolding isn't handled in dirstate yet, triggering a bunch of assertions. But while this is more correctly `no-icasefs`, it's more likely to get attention if someone sees it. I'd just rather not have it adding to the noise on Windows for now. Differential Revision: https://phab.mercurial-scm.org/D10312

contrib: restore the `hg fix` configuration in the examples After decc3bd3f20d, running `black` will DTRT, but running `hg fix` did nothing (unless the example config file was %included, in which case it truncated the file instead of formatting it). I'm not sure why that was happening, but let's not leave a code shredder laying around. Differential Revision: https://phab.mercurial-scm.org/D10311

blackbox: fix type error on log rotation on read-only filesystem Grepping around, the code uses either encoding.strtolocal or stringutil.forcebytestr in this situation. No idea which is best. Differential Revision: https://phab.mercurial-scm.org/D10293

rust: Remove use of `py.eval()` The previous Rust code allocated an intermediate `Vec`, converted that to a Python list, then used `eval` to run Python code that converts that list to a Python set. rust-cpython exposes Rust bindings for Python sets, let’s use that instead to construct a set directly. Differential Revision: https://phab.mercurial-scm.org/D10328

rust: Remove the compile-time 'dirstate-tree' feature flag This code has compiler errors since it is not built on CI and nobody has been working on it for some time. We (Octobus) are still pursuing status optimizations based on a tree data structure for the dirstate, but upcoming patches will use a run-time opt-in instead of compile-time, so that at least corresponding Rust code keeps compiling when other changes are made. Differential Revision: https://phab.mercurial-scm.org/D10329

procutil: avoid using os.fork() to implement runbgcommand We ran into the following deadlock: - some command creates an ssh peer, then raises without explicitly closing the peer (hg id + extension in our case) - dispatch catches the exception, calls ui.log('commandfinish', ..) (the sshpeer is still not closed), which calls logtoprocess, which calls procutil.runbgcommand. - in the child of runbgcommand's fork(), between the fork and the exec, the opening of file descriptors triggers a gc which runs the destructor for sshpeer, which waits on ssh's stderr being closed, which never happens since ssh's stderr is held open by the parent of the fork where said destructor hasn't run Remotefilelog appears to have a hack around this deadlock as well. I don't know if there's more subtlety to it, because even though the problem is determistic, it is very fragile, so I didn't manage to reduce it. I can imagine three ways of tackling this problem: 1. don't run any python between fork and exec in runbgcommand 2. make the finalizer harmless after the fork 3. close the peer without relying on gc behavior This commit goes with 1, as forking without exec'ing is tricky in general in a language with gc finalizers. And maybe it's better in the presence of rust threads. A future commit will try 2 or 3. Performance wise: at low memory usage, it's an improvement. At higher memory usage, it's about 2x faster than before when ensurestart=True, but 2x slower when ensurestart=False. Not sure if that matters. The reason for that last bit is that the subprocess.Popen always waits for the execve to finish, and at high memory usage, execve is slow because it deallocates the large page table. Numbers and script: before after mem=1.0GB, ensurestart=True 52.1ms 26.0ms mem=1.0GB, ensurestart=False 14.7ms 26.0ms mem=0.5GB, ensurestart=True 23.2ms 11.2ms mem=0.5GB, ensurestart=False 6.2ms 11.3ms mem=0.2GB, ensurestart=True 15.7ms 7.4ms mem=0.2GB, ensurestart=False 4.3ms 8.1ms mem=0.0GB, ensurestart=True 2.3ms 0.7ms mem=0.0GB, ensurestart=False 0.8ms 0.8ms import time for memsize in [1_000_000_000, 500_000_000, 250_000_000, 0]: mem = 'a' * memsize for ensurestart in [True, False]: now = time.time() n = 100 for i in range(n): procutil.runbgcommand([b'true'], {}, ensurestart=ensurestart) after = time.time() ms = (after - now) / float(n) * 1000 print(f'mem={memsize / 1e9:.1f}GB, ensurestart={ensurestart} -> {ms:.1f}ms') Differential Revision: https://phab.mercurial-scm.org/D9019

share: store relative share paths with '/' separators I created a relative share in Windows and tried to use it in WSL, and it failed: abort: .hg/sharedpath points to nonexistent directory /mnt/c/Users/Matt/hg-review/.hg/..\..\hg\.hg Use `normpath` on the read side so that the code has the usual Windows style paths it always had (I don't think that matters much), but it also eliminates the directory escaping path components in the case where the path is printed. This will not fix repositories that have already been created, but it's trivial enough to hand edit the file to correct it. Differential Revision: https://phab.mercurial-scm.org/D10330

unit-tests: Fix `cargo test` on 32-bit platforms Fixes https://bz.mercurial-scm.org/show_bug.cgi?id=6506 This makes `IndexEntryBuilder::build`, which is only used in unit tests, use `u32` or `u64` instead of platform-dependent `usize` when packing binary data to be used at test input. To run Rust unit tests in 32-bit mode in a x86-64 environment, use: rustup target add i686-unknown-linux-gnu # Once (cd rust && cargo test --target i686-unknown-linux-gnu) Differential Revision: https://phab.mercurial-scm.org/D10351