Mercurial > hg
view tests/test-hgweb-descend-empties.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 | 273ce823ba5c |
| children |
line wrap: on
line source
#require serve Test chains of near empty directories, terminating 3 different ways: - a1: file at level 4 (deepest) - b1: two dirs at level 3 - d1: file at level 2 Set up the repo $ hg init test $ cd test $ mkdir -p a1/a2/a3/a4 $ mkdir -p b1/b2/b3/b4 $ mkdir -p b1/b2/b3/c4 $ mkdir -p d1/d2/d3/d4 $ echo foo > a1/a2/a3/a4/foo $ echo foo > b1/b2/b3/b4/foo $ echo foo > b1/b2/b3/c4/foo $ echo foo > d1/d2/d3/d4/foo $ echo foo > d1/d2/foo $ hg ci -Ama adding a1/a2/a3/a4/foo adding b1/b2/b3/b4/foo adding b1/b2/b3/c4/foo adding d1/d2/d3/d4/foo adding d1/d2/foo $ hg serve -n test -p $HGPORT -d --pid-file=hg.pid -E errors.log $ cat hg.pid >> $DAEMON_PIDS manifest with descending (paper) $ get-with-headers.py $LOCALIP:$HGPORT 'file' 200 Script output follows <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US"> <head> <link rel="icon" href="/static/hgicon.png" type="image/png" /> <meta name="robots" content="index, nofollow" /> <link rel="stylesheet" href="/static/style-paper.css" type="text/css" /> <script type="text/javascript" src="/static/mercurial.js"></script> <title>test: c9f45f7a1659 /</title> </head> <body> <div class="container"> <div class="menu"> <div class="logo"> <a href="https://mercurial-scm.org/"> <img src="/static/hglogo.png" alt="mercurial" /></a> </div> <ul> <li><a href="/shortlog/tip">log</a></li> <li><a href="/graph/tip">graph</a></li> <li><a href="/tags">tags</a></li> <li><a href="/bookmarks">bookmarks</a></li> <li><a href="/branches">branches</a></li> </ul> <ul> <li><a href="/rev/tip">changeset</a></li> <li class="active">browse</li> </ul> <ul> </ul> <ul> <li><a href="/help">help</a></li> </ul> </div> <div class="main"> <h2 class="breadcrumb"><a href="/">Mercurial</a> </h2> <h3> directory / @ 0:<a href="/rev/c9f45f7a1659">c9f45f7a1659</a> <span class="phase">draft</span> <span class="branchhead">default</span> <span class="tag">tip</span> </h3> <form class="search" action="/log"> <p><input name="rev" id="search1" type="text" size="30" value="" /></p> <div id="hint">Find changesets by keywords (author, files, the commit message), revision number or hash, or <a href="/help/revsets">revset expression</a>.</div> </form> <table class="bigtable"> <thead> <tr> <th class="name">name</th> <th class="size">size</th> <th class="permissions">permissions</th> </tr> </thead> <tbody class="stripes2"> <tr class="fileline"> <td class="name"> <a href="/file/tip/a1"> <img src="/static/coal-folder.png" alt="dir."/> a1/ </a> <a href="/file/tip/a1/a2/a3/a4"> a2/a3/a4 </a> </td> <td class="size"></td> <td class="permissions">drwxr-xr-x</td> </tr> <tr class="fileline"> <td class="name"> <a href="/file/tip/b1"> <img src="/static/coal-folder.png" alt="dir."/> b1/ </a> <a href="/file/tip/b1/b2/b3"> b2/b3 </a> </td> <td class="size"></td> <td class="permissions">drwxr-xr-x</td> </tr> <tr class="fileline"> <td class="name"> <a href="/file/tip/d1"> <img src="/static/coal-folder.png" alt="dir."/> d1/ </a> <a href="/file/tip/d1/d2"> d2 </a> </td> <td class="size"></td> <td class="permissions">drwxr-xr-x</td> </tr> </tbody> </table> </div> </div> </body> </html> manifest with descending (coal) $ get-with-headers.py $LOCALIP:$HGPORT 'file?style=coal' 200 Script output follows <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US"> <head> <link rel="icon" href="/static/hgicon.png" type="image/png" /> <meta name="robots" content="index, nofollow" /> <link rel="stylesheet" href="/static/style-paper.css" type="text/css" /> <link rel="stylesheet" href="/static/style-extra-coal.css" type="text/css" /> <script type="text/javascript" src="/static/mercurial.js"></script> <title>test: c9f45f7a1659 /</title> </head> <body> <div class="container"> <div class="menu"> <div class="logo"> <a href="https://mercurial-scm.org/"> <img src="/static/hglogo.png" alt="mercurial" /></a> </div> <ul> <li><a href="/shortlog/tip?style=coal">log</a></li> <li><a href="/graph/tip?style=coal">graph</a></li> <li><a href="/tags?style=coal">tags</a></li> <li><a href="/bookmarks?style=coal">bookmarks</a></li> <li><a href="/branches?style=coal">branches</a></li> </ul> <ul> <li><a href="/rev/tip?style=coal">changeset</a></li> <li class="active">browse</li> </ul> <ul> </ul> <ul> <li><a href="/help?style=coal">help</a></li> </ul> </div> <div class="main"> <h2 class="breadcrumb"><a href="/">Mercurial</a> </h2> <h3> directory / @ 0:<a href="/rev/c9f45f7a1659?style=coal">c9f45f7a1659</a> <span class="phase">draft</span> <span class="branchhead">default</span> <span class="tag">tip</span> </h3> <form class="search" action="/log"> <input type="hidden" name="style" value="coal" /> <p><input name="rev" id="search1" type="text" size="30" value="" /></p> <div id="hint">Find changesets by keywords (author, files, the commit message), revision number or hash, or <a href="/help/revsets">revset expression</a>.</div> </form> <table class="bigtable"> <thead> <tr> <th class="name">name</th> <th class="size">size</th> <th class="permissions">permissions</th> </tr> </thead> <tbody class="stripes2"> <tr class="fileline"> <td class="name"> <a href="/file/tip/a1?style=coal"> <img src="/static/coal-folder.png" alt="dir."/> a1/ </a> <a href="/file/tip/a1/a2/a3/a4?style=coal"> a2/a3/a4 </a> </td> <td class="size"></td> <td class="permissions">drwxr-xr-x</td> </tr> <tr class="fileline"> <td class="name"> <a href="/file/tip/b1?style=coal"> <img src="/static/coal-folder.png" alt="dir."/> b1/ </a> <a href="/file/tip/b1/b2/b3?style=coal"> b2/b3 </a> </td> <td class="size"></td> <td class="permissions">drwxr-xr-x</td> </tr> <tr class="fileline"> <td class="name"> <a href="/file/tip/d1?style=coal"> <img src="/static/coal-folder.png" alt="dir."/> d1/ </a> <a href="/file/tip/d1/d2?style=coal"> d2 </a> </td> <td class="size"></td> <td class="permissions">drwxr-xr-x</td> </tr> </tbody> </table> </div> </div> </body> </html> manifest with descending (monoblue) $ get-with-headers.py $LOCALIP:$HGPORT 'file?style=monoblue' 200 Script output follows <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <link rel="icon" href="/static/hgicon.png" type="image/png" /> <meta name="robots" content="index, nofollow"/> <link rel="stylesheet" href="/static/style-monoblue.css" type="text/css" /> <script type="text/javascript" src="/static/mercurial.js"></script> <title>test: files</title> <link rel="alternate" type="application/atom+xml" href="/atom-log" title="Atom feed for test"/> <link rel="alternate" type="application/rss+xml" href="/rss-log" title="RSS feed for test"/> </head> <body> <div id="container"> <div class="page-header"> <h1 class="breadcrumb"><a href="/">Mercurial</a> / files</h1> <form action="/log"> <input type="hidden" name="style" value="monoblue" /> <dl class="search"> <dt><label>Search: </label></dt> <dd><input type="text" name="rev" value="" /></dd> </dl> </form> <ul class="page-nav"> <li><a href="/summary?style=monoblue">summary</a></li> <li><a href="/shortlog?style=monoblue">shortlog</a></li> <li><a href="/changelog?style=monoblue">changelog</a></li> <li><a href="/graph/tip?style=monoblue">graph</a></li> <li><a href="/tags?style=monoblue">tags</a></li> <li><a href="/bookmarks?style=monoblue">bookmarks</a></li> <li><a href="/branches?style=monoblue">branches</a></li> <li class="current">files</li> <li><a href="/help?style=monoblue">help</a></li> </ul> </div> <ul class="submenu"> <li><a href="/rev/tip?style=monoblue">changeset</a></li> </ul> <h2 class="no-link no-border">files</h2> <p class="files">/ <span class="logtags"><span class="phasetag" title="draft">draft</span> <span class="branchtag" title="default">default</span> <span class="tagtag" title="tip">tip</span> </span></p> <table> <tr class="parity1"> <td>drwxr-xr-x</td> <td></td> <td></td> <td> <a href="/file/tip/a1?style=monoblue">a1</a> <a href="/file/tip/a1/a2/a3/a4?style=monoblue">a2/a3/a4</a> </td> <td><a href="/file/tip/a1?style=monoblue">files</a></td> </tr> <tr class="parity0"> <td>drwxr-xr-x</td> <td></td> <td></td> <td> <a href="/file/tip/b1?style=monoblue">b1</a> <a href="/file/tip/b1/b2/b3?style=monoblue">b2/b3</a> </td> <td><a href="/file/tip/b1?style=monoblue">files</a></td> </tr> <tr class="parity1"> <td>drwxr-xr-x</td> <td></td> <td></td> <td> <a href="/file/tip/d1?style=monoblue">d1</a> <a href="/file/tip/d1/d2?style=monoblue">d2</a> </td> <td><a href="/file/tip/d1?style=monoblue">files</a></td> </tr> </table> <div class="page-footer"> <p>Mercurial Repository: test</p> <ul class="rss-logo"> <li><a href="/rss-log">RSS</a></li> <li><a href="/atom-log">Atom</a></li> </ul> </div> <div id="powered-by"> <p><a href="https://mercurial-scm.org/" title="Mercurial"><img src="/static/hglogo.png" width=75 height=90 border=0 alt="mercurial" /></a></p> </div> </div> </body> </html> manifest with descending (gitweb) $ get-with-headers.py $LOCALIP:$HGPORT 'file?style=gitweb' 200 Script output follows <?xml version="1.0" encoding="ascii"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US" lang="en-US"> <head> <link rel="icon" href="/static/hgicon.png" type="image/png" /> <meta name="robots" content="index, nofollow"/> <link rel="stylesheet" href="/static/style-gitweb.css" type="text/css" /> <script type="text/javascript" src="/static/mercurial.js"></script> <title>test: files</title> <link rel="alternate" type="application/atom+xml" href="/atom-log" title="Atom feed for test"/> <link rel="alternate" type="application/rss+xml" href="/rss-log" title="RSS feed for test"/> </head> <body> <div class="page_header"> <a href="https://mercurial-scm.org/" title="Mercurial" style="float: right;">Mercurial</a> <a href="/">Mercurial</a> / files </div> <div class="page_nav"> <div> <a href="/summary?style=gitweb">summary</a> | <a href="/shortlog?style=gitweb">shortlog</a> | <a href="/log?style=gitweb">changelog</a> | <a href="/graph?style=gitweb">graph</a> | <a href="/tags?style=gitweb">tags</a> | <a href="/bookmarks?style=gitweb">bookmarks</a> | <a href="/branches?style=gitweb">branches</a> | files | <a href="/rev/tip?style=gitweb">changeset</a> | <a href="/help?style=gitweb">help</a> </div> <div class="search"> <form id="searchform" action="/log"> <input type="hidden" name="style" value="gitweb" /> <input name="rev" type="text" value="" size="40" /> <div id="hint">Find changesets by keywords (author, files, the commit message), revision number or hash, or <a href="/help/revsets">revset expression</a>.</div> </form> </div> </div> <div class="title">/ <span class="logtags"><span class="phasetag" title="draft">draft</span> <span class="branchtag" title="default">default</span> <span class="tagtag" title="tip">tip</span> </span></div> <table cellspacing="0"> <tr class="parity1"> <td style="font-family:monospace">drwxr-xr-x</td> <td style="font-family:monospace"></td> <td style="font-family:monospace"></td> <td> <a href="/file/tip/a1?style=gitweb">a1</a> <a href="/file/tip/a1/a2/a3/a4?style=gitweb">a2/a3/a4</a> </td> <td class="link"> <a href="/file/tip/a1?style=gitweb">files</a> </td> </tr> <tr class="parity0"> <td style="font-family:monospace">drwxr-xr-x</td> <td style="font-family:monospace"></td> <td style="font-family:monospace"></td> <td> <a href="/file/tip/b1?style=gitweb">b1</a> <a href="/file/tip/b1/b2/b3?style=gitweb">b2/b3</a> </td> <td class="link"> <a href="/file/tip/b1?style=gitweb">files</a> </td> </tr> <tr class="parity1"> <td style="font-family:monospace">drwxr-xr-x</td> <td style="font-family:monospace"></td> <td style="font-family:monospace"></td> <td> <a href="/file/tip/d1?style=gitweb">d1</a> <a href="/file/tip/d1/d2?style=gitweb">d2</a> </td> <td class="link"> <a href="/file/tip/d1?style=gitweb">files</a> </td> </tr> </table> <div class="page_footer"> <div class="page_footer_text">test</div> <div class="rss_logo"> <a href="/rss-log">RSS</a> <a href="/atom-log">Atom</a> </div> <br /> </div> </body> </html> manifest with descending (spartan) $ get-with-headers.py $LOCALIP:$HGPORT 'file?style=spartan' 200 Script output follows <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> <link rel="icon" href="/static/hgicon.png" type="image/png"> <meta name="robots" content="index, nofollow" /> <link rel="stylesheet" href="/static/style.css" type="text/css" /> <script type="text/javascript" src="/static/mercurial.js"></script> <title>test: files for changeset c9f45f7a1659</title> </head> <body> <div class="buttons"> <a href="/log/tip?style=spartan">changelog</a> <a href="/shortlog/tip?style=spartan">shortlog</a> <a href="/graph/tip?style=spartan">graph</a> <a href="/tags?style=spartan">tags</a> <a href="/branches?style=spartan">branches</a> <a href="/rev/tip?style=spartan">changeset</a> <a href="/help?style=spartan">help</a> </div> <h2><a href="/">Mercurial</a> / files for changeset <a href="/rev/c9f45f7a1659">c9f45f7a1659</a>: /</h2> <table cellpadding="0" cellspacing="0"> <tr class="parity1"> <td><tt>drwxr-xr-x</tt> </td> <td> </td> <td> </td> <td> <a href="/file/tip/a1?style=spartan">a1/</a> <a href="/file/tip/a1/a2/a3/a4?style=spartan"> a2/a3/a4 </a> </td> </tr> <tr class="parity0"> <td><tt>drwxr-xr-x</tt> </td> <td> </td> <td> </td> <td> <a href="/file/tip/b1?style=spartan">b1/</a> <a href="/file/tip/b1/b2/b3?style=spartan"> b2/b3 </a> </td> </tr> <tr class="parity1"> <td><tt>drwxr-xr-x</tt> </td> <td> </td> <td> </td> <td> <a href="/file/tip/d1?style=spartan">d1/</a> <a href="/file/tip/d1/d2?style=spartan"> d2 </a> </td> </tr> </table> <div class="logo"> <a href="https://mercurial-scm.org/"> <img src="/static/hglogo.png" width=75 height=90 border=0 alt="mercurial"></a> </div> </body> </html> $ cat errors.log $ cd ..