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view tests/test-purge.t @ 49000:dd6b67d5c256 stable
rust: fix unsound `OwningDirstateMap`
As per the previous patch, `OwningDirstateMap` is unsound. Self-referential
structs are difficult to implement correctly in Rust since the compiler is
free to move structs around as much as it wants to. They are also very rarely
needed in practice, so the state-of-the-art on how they should be done within
the Rust rules is still a bit new.
The crate `ouroboros` is an attempt at providing a safe way (in the Rust sense)
of declaring self-referential structs. It is getting a lot attention and was
improved very quickly when soundness issues were found in the past: rather than
relying on our own (limited) review circle, we might as well use the de-facto
common crate to fix this problem. This will give us a much better chance of
finding issues should any new ones be discovered as well as the benefit of
fewer `unsafe` APIs of our own.
I was starting to think about how I would present a safe API to the old struct
but soon realized that the callback-based approach was already done in
`ouroboros`, along with a lot more care towards refusing incorrect structs.
In short: we don't return a mutable reference to the `DirstateMap` anymore, we
expect users of its API to pass a `FnOnce` that takes the map as an argument.
This allows our `OwningDirstateMap` to control the input and output lifetimes
of the code that modifies it to prevent such issues.
Changing to `ouroboros` meant changing every API with it, but it is relatively
low churn in the end. It correctly identified the example buggy modification of
`copy_map_insert` outlined in the previous patch as violating the borrow rules.
Differential Revision: https://phab.mercurial-scm.org/D12429
author | Raphaël Gomès <rgomes@octobus.net> |
---|---|
date | Tue, 05 Apr 2022 10:55:28 +0200 |
parents | e845537f6adb |
children | 0cc5f74ff7f0 |
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#testcases dirstate-v1 dirstate-v2 #if dirstate-v2 $ cat >> $HGRCPATH << EOF > [format] > use-dirstate-v2=1 > [storage] > dirstate-v2.slow-path=allow > EOF #endif init $ hg init t $ cd t setup $ echo r1 > r1 $ hg ci -qAmr1 -d'0 0' $ mkdir directory $ echo r2 > directory/r2 $ hg ci -qAmr2 -d'1 0' $ echo 'ignored' > .hgignore $ hg ci -qAmr3 -d'2 0' purge without the extension $ hg st $ touch foo $ hg purge permanently delete 1 unknown files? (yN) n abort: removal cancelled [250] $ hg st ? foo $ hg purge --no-confirm $ hg st now enabling the extension $ cat <<EOF >> $HGRCPATH > [extensions] > purge = > EOF delete an empty directory $ mkdir empty_dir $ hg purge -p -v empty_dir $ hg purge --confirm permanently delete at least 1 empty directories? (yN) n abort: removal cancelled [250] $ hg purge -v removing directory empty_dir $ ls -A .hg .hgignore directory r1 delete an untracked directory $ mkdir untracked_dir $ touch untracked_dir/untracked_file1 $ touch untracked_dir/untracked_file2 $ hg purge -p untracked_dir/untracked_file1 untracked_dir/untracked_file2 $ hg purge -v removing file untracked_dir/untracked_file1 removing file untracked_dir/untracked_file2 removing directory untracked_dir $ ls -A .hg .hgignore directory r1 delete an untracked file $ touch untracked_file $ touch untracked_file_readonly $ "$PYTHON" <<EOF > import os > import stat > f = 'untracked_file_readonly' > os.chmod(f, stat.S_IMODE(os.stat(f).st_mode) & ~stat.S_IWRITE) > EOF $ hg purge -p untracked_file untracked_file_readonly $ hg purge --confirm permanently delete 2 unknown files? (yN) n abort: removal cancelled [250] $ hg purge -v removing file untracked_file removing file untracked_file_readonly $ ls -A .hg .hgignore directory r1 delete an untracked file in a tracked directory $ touch directory/untracked_file $ hg purge -p directory/untracked_file $ hg purge -v removing file directory/untracked_file $ ls -A .hg .hgignore directory r1 delete nested directories $ mkdir -p untracked_directory/nested_directory $ hg purge -p untracked_directory/nested_directory $ hg purge -v removing directory untracked_directory/nested_directory removing directory untracked_directory $ ls -A .hg .hgignore directory r1 delete nested directories from a subdir $ mkdir -p untracked_directory/nested_directory $ cd directory $ hg purge -p untracked_directory/nested_directory $ hg purge -v removing directory untracked_directory/nested_directory removing directory untracked_directory $ cd .. $ ls -A .hg .hgignore directory r1 delete only part of the tree $ mkdir -p untracked_directory/nested_directory $ touch directory/untracked_file $ cd directory $ hg purge -p ../untracked_directory untracked_directory/nested_directory $ hg purge --confirm permanently delete 1 unknown files? (yN) n abort: removal cancelled [250] $ hg purge -v ../untracked_directory removing directory untracked_directory/nested_directory removing directory untracked_directory $ cd .. $ ls -A .hg .hgignore directory r1 $ ls directory/untracked_file directory/untracked_file $ rm directory/untracked_file skip ignored files if -i or --all not specified $ touch ignored $ hg purge -p $ hg purge --confirm $ hg purge -v $ touch untracked_file $ ls directory ignored r1 untracked_file $ hg purge -p -i ignored $ hg purge --confirm -i permanently delete 1 ignored files? (yN) n abort: removal cancelled [250] $ hg purge -v -i removing file ignored $ ls -A .hg .hgignore directory r1 untracked_file $ touch ignored $ hg purge -p --all ignored untracked_file $ hg purge --confirm --all permanently delete 1 unknown and 1 ignored files? (yN) n abort: removal cancelled [250] $ hg purge -v --all removing file ignored removing file untracked_file $ ls directory r1 abort with missing files until we support name mangling filesystems $ touch untracked_file $ rm r1 hide error messages to avoid changing the output when the text changes $ hg purge -p 2> /dev/null untracked_file $ hg st ! r1 ? untracked_file $ hg purge -p untracked_file $ hg purge -v 2> /dev/null removing file untracked_file $ hg st ! r1 $ hg purge -v $ hg revert --all --quiet $ hg st -a tracked file in ignored directory (issue621) $ echo directory >> .hgignore $ hg ci -m 'ignore directory' $ touch untracked_file $ hg purge -p untracked_file $ hg purge -v removing file untracked_file skip excluded files $ touch excluded_file $ hg purge -p -X excluded_file $ hg purge -v -X excluded_file $ ls -A .hg .hgignore directory excluded_file r1 $ rm excluded_file skip files in excluded dirs $ mkdir excluded_dir $ touch excluded_dir/file $ hg purge -p -X excluded_dir $ hg purge -v -X excluded_dir $ ls -A .hg .hgignore directory excluded_dir r1 $ ls excluded_dir file $ rm -R excluded_dir skip excluded empty dirs $ mkdir excluded_dir $ hg purge -p -X excluded_dir $ hg purge -v -X excluded_dir $ ls -A .hg .hgignore directory excluded_dir r1 $ rmdir excluded_dir skip patterns $ mkdir .svn $ touch .svn/foo $ mkdir directory/.svn $ touch directory/.svn/foo $ hg purge -p -X .svn -X '*/.svn' $ hg purge -p -X re:.*.svn $ rm -R .svn directory r1 only remove files $ mkdir -p empty_dir dir $ touch untracked_file dir/untracked_file $ hg purge -p --files dir/untracked_file untracked_file $ hg purge -v --files removing file dir/untracked_file removing file untracked_file $ ls -A .hg .hgignore dir empty_dir $ ls dir only remove dirs $ mkdir -p empty_dir dir $ touch untracked_file dir/untracked_file $ hg purge -p --dirs empty_dir $ hg purge -v --dirs removing directory empty_dir $ ls -A .hg .hgignore dir untracked_file $ ls dir untracked_file remove both files and dirs $ mkdir -p empty_dir dir $ touch untracked_file dir/untracked_file $ hg purge -p --files --dirs dir/untracked_file untracked_file empty_dir $ hg purge -v --files --dirs removing file dir/untracked_file removing file untracked_file removing directory empty_dir removing directory dir $ ls -A .hg .hgignore $ cd ..