Mercurial > hg
view tests/test-churn.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 | b84c3d43ff2e |
children |
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$ echo "[extensions]" >> $HGRCPATH $ echo "churn=" >> $HGRCPATH create test repository $ hg init repo $ cd repo $ echo a > a $ hg ci -Am adda -u user1 -d 6:00 adding a $ echo b >> a $ echo b > b $ hg ci -m changeba -u user2 -d 9:00 a $ hg ci -Am addb -u user2 -d 9:30 adding b $ echo c >> a $ echo c >> b $ echo c > c $ hg ci -m changeca -u user3 -d 12:00 a $ hg ci -m changecb -u user3 -d 12:15 b $ hg ci -Am addc -u user3 -d 12:30 adding c $ mkdir -p d/e $ echo abc > d/e/f1.txt $ hg ci -Am "add d/e/f1.txt" -u user1 -d 12:45 d/e/f1.txt $ mkdir -p d/g $ echo def > d/g/f2.txt $ hg ci -Am "add d/g/f2.txt" -u user1 -d 13:00 d/g/f2.txt churn separate directories $ cd d $ hg churn e user1 1 *************************************************************** churn all $ hg churn user1 3 *************************************************************** user3 3 *************************************************************** user2 2 ****************************************** churn excluding one dir $ hg churn -X e user3 3 *************************************************************** user1 2 ****************************************** user2 2 ****************************************** churn up to rev 2 $ hg churn -r :2 user2 2 *************************************************************** user1 1 ******************************* $ cd .. churn with aliases $ cat > ../aliases <<EOF > user1 alias1 > user3 alias3 > not-an-alias > EOF churn with .hgchurn $ mv ../aliases .hgchurn $ hg churn skipping malformed alias: not-an-alias alias1 3 ************************************************************** alias3 3 ************************************************************** user2 2 ***************************************** $ rm .hgchurn churn with column specifier $ COLUMNS=40 hg churn user1 3 *********************** user3 3 *********************** user2 2 *************** churn by hour $ hg churn -f '%H' -s 06 1 **************** 09 2 ********************************* 12 4 ****************************************************************** 13 1 **************** churn with separated added/removed lines $ hg rm d/g/f2.txt $ hg ci -Am "removed d/g/f2.txt" -u user1 -d 14:00 d/g/f2.txt $ hg churn --diffstat user1 +3/-1 ++++++++++++++++++++++++++++++++++++++++------------- user3 +3/-0 ++++++++++++++++++++++++++++++++++++++++ user2 +2/-0 +++++++++++++++++++++++++++ churn --diffstat with color $ hg --config extensions.color= churn --config color.mode=ansi \ > --diffstat --color=always user1 +3/-1 \x1b[0;32m++++++++++++++++++++++++++++++++++++++++\x1b[0m\x1b[0;31m-------------\x1b[0m (esc) user3 +3/-0 \x1b[0;32m++++++++++++++++++++++++++++++++++++++++\x1b[0m (esc) user2 +2/-0 \x1b[0;32m+++++++++++++++++++++++++++\x1b[0m (esc) changeset number churn $ hg churn -c user1 4 *************************************************************** user3 3 *********************************************** user2 2 ******************************* $ echo 'with space = no-space' >> ../aliases $ echo a >> a $ hg commit -m a -u 'with space' -d 15:00 churn with space in alias $ hg churn --aliases ../aliases -r tip no-space 1 ************************************************************ $ cd .. Issue833: ZeroDivisionError $ hg init issue-833 $ cd issue-833 $ touch foo $ hg ci -Am foo adding foo this was failing with a ZeroDivisionError $ hg churn test 0 $ cd .. Ignore trailing or leading spaces in emails $ cd repo $ touch bar $ hg ci -Am'bar' -u 'user4 <user4@x.com>' adding bar $ touch foo $ hg ci -Am'foo' -u 'user4 < user4@x.com >' adding foo $ hg log -l2 --template '[{author|email}]\n' [ user4@x.com ] [user4@x.com] $ hg churn -c user1 4 ********************************************************* user3 3 ****************************************** user2 2 **************************** user4@x.com 2 **************************** with space 1 ************** Test multibyte sequences in names $ echo bar >> bar $ hg --encoding utf-8 ci -m'changed bar' -u 'El NiƱo <nino@x.com>' $ hg --encoding utf-8 churn -ct '{author|person}' user1 4 ********************************************************** user3 3 ******************************************* user2 2 ***************************** user4 2 ***************************** El Ni\xc3\xb1o 1 ************** (esc) with space 1 ************** Test --template argument, with backwards compatibility $ hg churn -t '{author|user}' user1 4 *************************************************************** user3 3 *********************************************** user2 2 ******************************* nino 1 *************** with 1 *************** 0 user4 0 $ hg churn -T '{author|user}' user1 4 *************************************************************** user3 3 *********************************************** user2 2 ******************************* nino 1 *************** with 1 *************** 0 user4 0 $ hg churn -t 'alltogether' alltogether 11 ********************************************************* $ hg churn -T 'alltogether' alltogether 11 ********************************************************* $ cd .. count lines that look like headings but are not $ hg init not-headers $ cd not-headers $ cat > a <<EOF > diff > @@ -195,3 +195,21 @@ > -- a/tests/test-churn.t > ++ b/tests/test-churn.t > EOF $ hg ci -Am adda -u user1 adding a $ hg churn --diffstat user1 +4/-0 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ $ hg rm a $ hg ci -Am removea -u user1 $ hg churn --diffstat user1 +4/-4 +++++++++++++++++++++++++++---------------------------