Mercurial > hg
view tests/test-serve.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 | 6f43569729d4 |
children | 9c5e743e400c |
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#require serve $ hgserve() > { > hg serve -a localhost -d --pid-file=hg.pid -E errors.log -v $@ \ > | sed -e "s/:$HGPORT1\\([^0-9]\\)/:HGPORT1\1/g" \ > -e "s/:$HGPORT2\\([^0-9]\\)/:HGPORT2\1/g" \ > -e 's/http:\/\/[^/]*\//http:\/\/localhost\//' > if [ -f hg.pid ]; then > killdaemons.py hg.pid > fi > echo % errors > cat errors.log > } $ hg init test $ cd test $ echo '[web]' > .hg/hgrc $ echo 'accesslog = access.log' >> .hg/hgrc $ echo "port = $HGPORT1" >> .hg/hgrc Without -v $ hg serve -a localhost -p $HGPORT -d --pid-file=hg.pid -E errors.log $ cat hg.pid >> "$DAEMON_PIDS" $ if [ -f access.log ]; then > echo 'access log created - .hg/hgrc respected' > fi access log created - .hg/hgrc respected errors $ cat errors.log With -v $ hgserve listening at http://localhost/ (bound to *$LOCALIP*:HGPORT1) (glob) (?) % errors With -v and -p HGPORT2 $ hgserve -p "$HGPORT2" listening at http://localhost/ (bound to *$LOCALIP*:HGPORT2) (glob) (?) % errors With -v and -p daytime # On some system this will fails because port < 1024 are not bindable by normal # users. # # On some others the kernel is configured to allow any user to bind them and # this will work fine #if no-windows $ KILLQUIETLY=Y $ hgserve -p daytime abort: cannot start server at 'localhost:13': Permission denied (?) abort: child process failed to start (?) abort: no port number associated with service 'daytime' (?) listening at http://localhost/ (bound to $LOCALIP:13) (?) % errors $ KILLQUIETLY=N #endif With --prefix foo $ hgserve --prefix foo listening at http://localhost/foo/ (bound to *$LOCALIP*:HGPORT1) (glob) (?) % errors With --prefix /foo $ hgserve --prefix /foo listening at http://localhost/foo/ (bound to *$LOCALIP*:HGPORT1) (glob) (?) % errors With --prefix foo/ $ hgserve --prefix foo/ listening at http://localhost/foo/ (bound to *$LOCALIP*:HGPORT1) (glob) (?) % errors With --prefix /foo/ $ hgserve --prefix /foo/ listening at http://localhost/foo/ (bound to *$LOCALIP*:HGPORT1) (glob) (?) % errors $ "$PYTHON" $RUNTESTDIR/killdaemons.py $DAEMON_PIDS With out of bounds accesses $ rm access.log $ hg serve -a localhost -p $HGPORT -d --prefix some/dir \ > --pid-file=hg.pid -E errors.log $ cat hg.pid >> "$DAEMON_PIDS" $ hg id http://localhost:$HGPORT/some/dir7 abort: HTTP Error 404: Not Found [100] $ hg id http://localhost:$HGPORT/some abort: HTTP Error 404: Not Found [100] $ cat access.log errors.log $LOCALIP - - [$LOGDATE$] "GET /some/dir7?cmd=capabilities HTTP/1.1" 404 - (glob) $LOCALIP - - [$LOGDATE$] "GET /some?cmd=capabilities HTTP/1.1" 404 - (glob) $ "$PYTHON" $RUNTESTDIR/killdaemons.py $DAEMON_PIDS issue6362: Previously, this crashed on Python 3 $ hg serve -a 0.0.0.0 -d --pid-file=hg.pid listening at http://*:$HGPORT1/ (bound to *:$HGPORT1) (glob) (?) $ cat hg.pid > "$DAEMON_PIDS" $ "$PYTHON" $RUNTESTDIR/killdaemons.py $DAEMON_PIDS $ cd ..