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diff --git a/content/posts/2007-10-15-brain-dump-random-migration-notes.html b/content/posts/2007-10-15-brain-dump-random-migration-notes.html new file mode 100644 index 0000000..88a770e --- /dev/null +++ b/content/posts/2007-10-15-brain-dump-random-migration-notes.html @@ -0,0 +1,129 @@ +--- +date: "2007-10-15T06:16:32Z" +title: 'Brain Dump: Random Migration Notes' +--- + +<!--img src='http://pablotron.org/gallery/misc/brain_dump.png' + width='273' height='200' align='right' /--> + +<p>I've been using the migration and some recent side projects as sandboxes +to try out new things. Here's a semi-random list of useful tidbits I've +picked up along the way:</p> + +<ul> +<li><p>Better mod_rewrite magic: Google turns up plenty of <a href="http://httpd.apache.org/docs/2.0/mod/mod_rewrite.html">mod_rewrite</a> +examples on automatically stripping the dreaded "www." prefix from +URLs. Unfortunately, most of them appear to be incorrect. Here's the +most common solution:</p> + +<p><code><pre>RewriteCond %{HTTP_HOST} ^www.example.com$ [NC] +RewriteRule ^(.*)$ http://example.com/$1 [R=301,L]</code></pre></p> + +<p>What it's <em>supposed</em> to do is redirect visitors from +<code>http://www.example.com/whatever</code> to <code>http://example.com/whatever</code>, +but what it <em>actually</em> does is redirect visitors to +<code>http://example.com//whatever</code>. It's minor, but it was driving me +nuts (Arrrrrrr). Anyway, here is the correct solution:</p> + +<p><code><pre>RewriteCond %{HTTP_HOST} ^www\. [NC] +RewriteRule ^/(.*)$ http://example.com/$1 [R=301,L]</pre></code></p></li> +<li><p><a href="http://httpd.apache.org/docs/2.0/mod/mod_deflate.html">mod_deflate</a>: Saves a ton of bandwidth, works great in IE7 and +Firefox. The stock settings don't include a couple of common MIME +types; here's the list I'm using: +text/html text/plain text/xml text/css text/javascript +application/x-javascript text/csv</p></li> +<li><a href="http://xcache.lighttpd.net/">XCache</a>: Fast PHP opcode cacher that actually works with recent +versions of PHP. I tested several <a href="http://wordpress.org/">Wordpress</a>, <a href="http://gallery.menalto.com/">Gallery</a>, and +custom PHP sites without incident, and my (incredibly rough) benchmarks +showed about a 4-7% increase in mean transfer speed.</li> +<li><p><a href="http://extjs.com/download/build">ExtJS Builder</a>: I decided to test the <a href="http://extjs.com/">ExtJS</a> builder for a +personal project. The interface is a bit finicky; it took me about 5 +tries to get all the dependencies for my project selected. Here are +the results:</p> + +<table style='font-size: 9pt; '> +<tr><td>File</td><td>Minified</td><td>Deflated</td></tr> +<tr><td>ext-all.js</td><td>468k</td><td>125k</td></tr> +<tr><td>ext-mine.js</td><td>276k</td><td>77k</td></tr> +</table> + +<p>Note: The "Minified" column is the total file size after being shrunk with <a +href='http://javascript.crockford.com/jsmin.html'>Douglas Crockford's +excellent <code>jsmin</code></a>, and the "Deflated" column is +the actual transfer size (according to <a +href='https://addons.mozilla.org/en-US/firefox/addon/1843'>Firebug</a>) after being passed through +<code>mod_deflate</code>. +</p> + +<p>Not too shabby for 20 minutes of work. I'm a little bit disappointed +by the stock mod_deflate compression ratio, so that may need a bit of +tweaking.</p></li> +<li><p>Backgrounding Mercurial Hooks: The <a href="http://hgbook.red-bean.com/hgbook.html">Mercurial book</a> has an excellent +chapter on hooks. What it doesn't mention, unfortunately, is how to +run hooks in the background. I have a semi-lengthy <code>outgoing</code> hook +(roughly equivalent to a client-side <code>post-commit</code> for you Subversion +weenies) that connects to a web server via <code>ssh</code> and performs some +deployment tasks, and all attempts at backgrounding a shell script +eluded me. Well, it turns out Mercurial has an extra hidden file +descriptor that has to be closed in order to background a hook. So +here's my down and dirty client-side background deployment hook:</p> + +<p><code><pre> +# +# outgoing hook script that connects to web server and deploys +# the latest site from tip. It is run in the background after a +# successful 'hg push'. +# + +# options +opt = { + # remote hostname + 'host' => 'web', + + # remote command (relative to my home directory) + 'cmd' => 'bin/update_site.sh', + + # client-side log (set to /dev/null to disable) + # 'log' => '/dev/null', + 'log' => '/tmp/site_update.log', + + # delay (in seconds) before update + 'delay' => 3, +} + +# fork and run update in background +pid = fork { + # close stdin, stdout, and stderr + $stdin = $stdin.reopen('/dev/null', 'r') + $stdout = $stdout.reopen(opt['log'], 'a') + $stderr = $stderr.reopen(opt['log'], 'a') + $defout = $stdout + + # close all other file descriptors + # NOTE: mercurial appears to have a hidden fd laying + # around somewhere, so this evil is necessary... + (3..99).each { |fd| IO.new(fd).close rescue nil } + + # wait for push to finish + # (this should poll the hg server instead, to handle + # lengthy pushes) + sleep opt['delay'] + + # run update command and exit + args = ['ssh', opt['host'], opt['cmd']] + exec(*args) + + # never reached + exit 0 +} + +# reap child and exit +flags = Process::WNOHANG | Process::WUNTRACED +Process.waitpid(pid, flags) +</pre></code></p></li> +</ul> + +<p> +<b>Update:</b> Markdown really mangled my markup this time around. Usually it's pretty tolerant, but apparently this post was just a bit too much. Oh well... +</p> + |