Mercurial > hg
view tests/test-http-api.t @ 46846:2819df466cae
tests: add test-remotefilelog-strip.t to demonstrate an issue with linknodes
### Background
Every time a commit is modified, remotefilelog updates the metadata for the file
object to point to the new commit (I believe that this is different from
non-remotefilelog hg, which leaves the linkrevs pointing to the obsolete
commits; doing otherwise would involve changing data in the middle of revlogs).
With `hg strip` (or other things that use repair.strip()), when you strip a
commit that's not the tip of the revlog, there may be commits after it in revnum
order that aren't descended from it and don't need to be (and shouldn't be)
stripped. These are "saved" by strip in a bundle, and that bundle is reapplied
after truncating the relevant revlogs.
### The problem
Remotefilelog generally avoids being involved at all in strip. Currently, that
includes even providing file contents to this backup bundle. This can cause the
linknode to point to a changeset that is no longer in the repository.
Example:
```
@ 3 df91f74b871e
|
| x 2 70494d7ec5ef
|/
| x 1 1e423846dde0
|/
o 0 b292c1e3311f
```
Commits 1, 2, and 3 are related via obsolescence, and are description-only
changes. The linknode for the file in these commits changed each time we updated
the description, so it's currently df91f7. If I strip commits 1 and 3, however,
the linknode *remains* df91f7, which no longer exists in the repository. Commit
70494d was "saved", stripped, and then reapplied, so it is in the repository (as
revision 1 instead of 2 now), and was unobsoleted since the obsmarker was
stripped as well. The linknode for the file should point to 70494d, the most
recent commit that is in the repository that modified the file.
Remotefilelog has some logic to handle broken linknodes, but it can be slow. We
have actually disabled it internally because it's too slow for our purposes.
Differential Revision: https://phab.mercurial-scm.org/D10319
author | Kyle Lippincott <spectral@google.com> |
---|---|
date | Tue, 06 Apr 2021 15:38:33 -0700 |
parents | 2f7408b7d247 |
children |
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#require no-chg $ send() { > hg --verbose debugwireproto --peer raw http://$LOCALIP:$HGPORT/ > } $ hg init server $ hg -R server serve -p $HGPORT -d --pid-file hg.pid $ cat hg.pid > $DAEMON_PIDS Request to /api fails unless web.apiserver is enabled $ get-with-headers.py $LOCALIP:$HGPORT api 400 no such method: api <!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>$TESTTMP/server: error</title> </head> <body> <div class="container"> <div class="menu"> <div class="logo"> <a href="https://mercurial-scm.org/"> <img src="/static/hglogo.png" width=75 height=90 border=0 alt="mercurial" /></a> </div> <ul> <li><a href="/shortlog">log</a></li> <li><a href="/graph">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="/help">help</a></li> </ul> </div> <div class="main"> <h2 class="breadcrumb"><a href="/">Mercurial</a> </h2> <h3>error</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> <div class="description"> <p> An error occurred while processing your request: </p> <p> no such method: api </p> </div> </div> </div> </body> </html> [1] $ get-with-headers.py $LOCALIP:$HGPORT api/ 400 no such method: api <!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>$TESTTMP/server: error</title> </head> <body> <div class="container"> <div class="menu"> <div class="logo"> <a href="https://mercurial-scm.org/"> <img src="/static/hglogo.png" width=75 height=90 border=0 alt="mercurial" /></a> </div> <ul> <li><a href="/shortlog">log</a></li> <li><a href="/graph">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="/help">help</a></li> </ul> </div> <div class="main"> <h2 class="breadcrumb"><a href="/">Mercurial</a> </h2> <h3>error</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> <div class="description"> <p> An error occurred while processing your request: </p> <p> no such method: api </p> </div> </div> </div> </body> </html> [1] Restart server with support for API server $ killdaemons.py $ cat > server/.hg/hgrc << EOF > [experimental] > web.apiserver = true > EOF $ hg -R server serve -p $HGPORT -d --pid-file hg.pid $ cat hg.pid > $DAEMON_PIDS /api lists available APIs (empty since none are available by default) $ send << EOF > httprequest GET api > user-agent: test > EOF using raw connection to peer s> setsockopt(6, 1, 1) -> None (?) s> GET /api HTTP/1.1\r\n s> Accept-Encoding: identity\r\n s> user-agent: test\r\n s> host: $LOCALIP:$HGPORT\r\n (glob) s> \r\n s> makefile('rb', None) s> HTTP/1.1 200 OK\r\n s> Server: testing stub value\r\n s> Date: $HTTP_DATE$\r\n s> Content-Type: text/plain\r\n s> Content-Length: 100\r\n s> \r\n s> APIs can be accessed at /api/<name>, where <name> can be one of the following:\n s> \n s> (no available APIs)\n $ send << EOF > httprequest GET api/ > user-agent: test > EOF using raw connection to peer s> setsockopt(6, 1, 1) -> None (?) s> GET /api/ HTTP/1.1\r\n s> Accept-Encoding: identity\r\n s> user-agent: test\r\n s> host: $LOCALIP:$HGPORT\r\n (glob) s> \r\n s> makefile('rb', None) s> HTTP/1.1 200 OK\r\n s> Server: testing stub value\r\n s> Date: $HTTP_DATE$\r\n s> Content-Type: text/plain\r\n s> Content-Length: 100\r\n s> \r\n s> APIs can be accessed at /api/<name>, where <name> can be one of the following:\n s> \n s> (no available APIs)\n Accessing an unknown API yields a 404 $ send << EOF > httprequest GET api/unknown > user-agent: test > EOF using raw connection to peer s> setsockopt(6, 1, 1) -> None (?) s> GET /api/unknown HTTP/1.1\r\n s> Accept-Encoding: identity\r\n s> user-agent: test\r\n s> host: $LOCALIP:$HGPORT\r\n (glob) s> \r\n s> makefile('rb', None) s> HTTP/1.1 404 Not Found\r\n s> Server: testing stub value\r\n s> Date: $HTTP_DATE$\r\n s> Content-Type: text/plain\r\n s> Content-Length: 33\r\n s> \r\n s> Unknown API: unknown\n s> Known APIs: Accessing a known but not enabled API yields a different error $ send << EOF > httprequest GET api/exp-http-v2-0003 > user-agent: test > EOF using raw connection to peer s> setsockopt(6, 1, 1) -> None (?) s> GET /api/exp-http-v2-0003 HTTP/1.1\r\n s> Accept-Encoding: identity\r\n s> user-agent: test\r\n s> host: $LOCALIP:$HGPORT\r\n (glob) s> \r\n s> makefile('rb', None) s> HTTP/1.1 404 Not Found\r\n s> Server: testing stub value\r\n s> Date: $HTTP_DATE$\r\n s> Content-Type: text/plain\r\n s> Content-Length: 33\r\n s> \r\n s> API exp-http-v2-0003 not enabled\n Restart server with support for HTTP v2 API $ killdaemons.py $ cat > server/.hg/hgrc << EOF > [experimental] > web.apiserver = true > web.api.http-v2 = true > EOF $ hg -R server serve -p $HGPORT -d --pid-file hg.pid $ cat hg.pid > $DAEMON_PIDS /api lists the HTTP v2 protocol as available $ send << EOF > httprequest GET api > user-agent: test > EOF using raw connection to peer s> setsockopt(6, 1, 1) -> None (?) s> GET /api HTTP/1.1\r\n s> Accept-Encoding: identity\r\n s> user-agent: test\r\n s> host: $LOCALIP:$HGPORT\r\n (glob) s> \r\n s> makefile('rb', None) s> HTTP/1.1 200 OK\r\n s> Server: testing stub value\r\n s> Date: $HTTP_DATE$\r\n s> Content-Type: text/plain\r\n s> Content-Length: 96\r\n s> \r\n s> APIs can be accessed at /api/<name>, where <name> can be one of the following:\n s> \n s> exp-http-v2-0003 $ send << EOF > httprequest GET api/ > user-agent: test > EOF using raw connection to peer s> setsockopt(6, 1, 1) -> None (?) s> GET /api/ HTTP/1.1\r\n s> Accept-Encoding: identity\r\n s> user-agent: test\r\n s> host: $LOCALIP:$HGPORT\r\n (glob) s> \r\n s> makefile('rb', None) s> HTTP/1.1 200 OK\r\n s> Server: testing stub value\r\n s> Date: $HTTP_DATE$\r\n s> Content-Type: text/plain\r\n s> Content-Length: 96\r\n s> \r\n s> APIs can be accessed at /api/<name>, where <name> can be one of the following:\n s> \n s> exp-http-v2-0003