I have a single downloads directory with symlinks for every target build I have to that directory. As long as I have the source already in there I don't fetch it again<div><br></div><div>Tom<br><br><div class="gmail_quote">
On Wed, Feb 22, 2012 at 1:33 PM, Rich Pixley <span dir="ltr"><<a href="mailto:rich.pixley@palm.com">rich.pixley@palm.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
Is it reasonable to expect to share DL_DIR between multiple builds?<br>
<br>
That is, are downloads properly locked so that multiple concurrent
downloads of the same file won't collide? And if so, are they NFS
safe locks?<br>
<br>
Or must each build download it's own copies of every component?<br>
<br>
I ask because our, (Palm), branch has been, but it's a bit of a
nuisance to pick a suitable locking mechanism that is both
functional and performant.<br>
<ul>
<li>Flock/lockf aren't reliably supported in heterogeneous
environments.</li>
<li>The old lockfiles don't work over NFS. Lock directories
apparently do, but trying to clean these up after interruptions
or failures is a losing battle so if we do use these, we end up
with orphan locks periodically.</li>
<li>With NFS as a possibility, we can't assume any kernel local
IPC mechanism, so sysV ipc is out.</li>
<li>It seems like a pretty huge overhead to try to create any sort
of zeroconf overhead.</li>
</ul>
<p>Our solution so far has been to use NFS lock directories for
multiple machine builds and flock/lockf for single machine
builds. This mostly works, though it's not ideal, and it's
significantly faster than downloading/copying all of the component
source multiple times even over local mirrors.<span class="HOEnZb"><font color="#888888"><br>
</font></span></p><span class="HOEnZb"><font color="#888888">
--rich<br>
</font></span></div>
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