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hg: obtain lock when creating share from pooled repo (issue5104)...
hg: obtain lock when creating share from pooled repo (issue5104) There are race conditions between clients performing a shared clone to pooled storage: 1) Clients race to create the new shared repo in the pool directory 2) 1 client is seeding the repo in the pool directory and another goes to share it before it is fully cloned We prevent these race conditions by obtaining a lock in the pool directory that is derived from the name of the repo we will be accessing. To test this, a simple generic "lockdelay" extension has been added. The extension inserts an optional, configurable delay before or after lock acquisition. In the test, we delay 2 seconds after lock acquisition in the first process and 1 second before lock acquisition in the 2nd process. This means the first process has 1s to obtain the lock. There is a race condition here. If we encounter it in the wild, we could change the dummy extension to wait on the lock file to appear instead of relying on timing. But that's more complicated. Let's see what happens first.

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r27925:f6d73c87 stable
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ReadMe.html
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r1288 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Mercurial for Windows</title>
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<!--
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font-family: sans-serif;
margin: 1em 2em;
}
p {
margin-top: 0.5em;
margin-bottom: 0.5em;
}
pre {
margin: 0.25em 0em;
padding: 0.5em;
background-color: #EEE;
border: thin solid #CCC;
}
.indented {
padding-left: 10pt;
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-->
</style>
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r1288 </head>
<body>
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r3863 <h1>Mercurial for Windows</h1>
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<p>Welcome to Mercurial for Windows!</p>
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r8438 <p>
Mercurial is a command-line application. You must run it from
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r1288 the Windows command prompt (or if you're hard core, a <a
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r8438 href="http://www.mingw.org/">MinGW</a> shell).
</p>
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r8438 <p class="indented">
<i>Note: the standard <a href="http://www.mingw.org/">MinGW</a>
msys startup script uses rxvt which has problems setting up
standard input and output. Running bash directly works
correctly.</i>
</p>
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r1288
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r8438 <p>
For documentation, please visit the <a
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r26421 href="https://mercurial-scm.org/">Mercurial web site</a>.
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r4723 You can also download a free book, <a
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r8440 href="http://hgbook.red-bean.com/">Mercurial: The Definitive
Guide</a>.
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r8438 </p>
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r1288
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r8438 <p>
By default, Mercurial installs to <tt>C:\Program
Files\Mercurial</tt>. The Mercurial command is called
<tt>hg.exe</tt>.
</p>
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<h1>Testing Mercurial after you've installed it</h1>
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r8438 <p>
The easiest way to check that Mercurial is installed properly is
to just type the following at the command prompt:
</p>
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<pre>
hg
</pre>
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r8438 <p>
This command should print a useful help message. If it does,
other Mercurial commands should work fine for you.
</p>
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r1288
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r2307 <h1>Configuration notes</h1>
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r8438 <h4>Default editor</h4>
<p>
The default editor for commit messages is 'notepad'. You can set
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r8439 the <tt>EDITOR</tt> (or <tt>HGEDITOR</tt>) environment variable
to specify your preference or set it in <tt>mercurial.ini</tt>:
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r8438 </p>
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r2321 <pre>
[ui]
editor = whatever
</pre>
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r8438 <h4>Configuring a Merge program</h4>
<p>
It should be emphasized that Mercurial by itself doesn't attempt
to do a Merge at the file level, neither does it make any
attempt to Resolve the conflicts.
</p>
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r4386
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r8438 <p>
By default, Mercurial will use the merge program defined by the
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r8439 <tt>HGMERGE</tt> environment variable, or uses the one defined
in the <tt>mercurial.ini</tt> file. (see <a
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r26421 href="https://mercurial-scm.org/wiki/MergeProgram">MergeProgram</a>
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r8438 on the Mercurial Wiki for more information)
</p>
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r2307
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r1288 <h1>Reporting problems</h1>
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r8438 <p>
Before you report any problems, please consult the <a
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r26421 href="https://mercurial-scm.org/">Mercurial web site</a>
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r8438 and see if your question is already in our list of <a
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r26421 href="https://mercurial-scm.org/wiki/FAQ">Frequently
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r8438 Answered Questions</a> (the "FAQ").
</p>
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r8438 <p>
If you cannot find an answer to your question, please feel free
to send mail to the Mercurial mailing list, at <a
href="mailto:mercurial@selenic.com">mercurial@selenic.com</a>.
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r1288 <b>Remember</b>, the more useful information you include in your
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r8438 report, the easier it will be for us to help you!
</p>
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r8438 <p>
If you are IRC-savvy, that's usually the fastest way to get
help. Go to <tt>#mercurial</tt> on <tt>irc.freenode.net</tt>.
</p>
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<h1>Author and copyright information</h1>
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r8438 <p>
Mercurial was written by <a href="http://www.selenic.com">Matt
Mackall</a>, and is maintained by Matt and a team of volunteers.
</p>
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r8438 <p>
The Windows installer was written by <a
href="http://www.serpentine.com/blog">Bryan O'Sullivan</a>.
</p>
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timeless
copyright: update to 2016
r27925 Mercurial is Copyright 2005-2016 Matt Mackall and others. See
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r8438 the <tt>Contributors.txt</tt> file for a list of contributors.
</p>
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r8438 <p>
Mercurial is free software; you can redistribute it and/or
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r1288 modify it under the terms of the <a
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r8438 href="http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt">GNU
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r10263 General Public License version 2</a> or any later version.
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r8438 </p>
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r8438 <p>
Mercurial is distributed in the hope that it will be useful, but
<b>without any warranty</b>; without even the implied warranty
of <b>merchantability</b> or <b>fitness for a particular
purpose</b>. See the GNU General Public License for more
details.
</p>
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r1288 </body>
</html>