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POWhat's the best Perl module for hierarchical and inheritable configuration?
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  1. POWhat's the best Perl module for hierarchical and inheritable configuration?
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    copied!<p>If I have a greenfield project, what is the best practice Perl based configuration module to use?</p> <p>There will be a Catalyst app and some command line scripts. They should share the same configuration.</p> <p>Some features I think I want ...</p> <p>Hierarchical Configurations to cleanly maintain different development and live settings. </p> <p>I'd like to define "global" configurations once (eg, results_per_page => 20), have those inherited but override-able by my dev/live configs. </p> <pre><code>Global: results_per_page: 20 db_dsn: DBI:mysql; db_name: my_app Dev: inherit_from: Global db_user: dev db_pass: dev Dev_New_Feature_Branch: inherit_from: Dev db_name: my_app_new_feature Live: inherit_from: Global db_user: live db_pass: secure </code></pre> <p>When I deploy a project to a new server, or branch/fork/copy it somewhere new (eg, a new development instance), I want to (one time only) set which configuration set/file to use, and then all future updates are automatic.</p> <p>I'd envisage this could be achieved with a symlink:</p> <pre><code>git clone example.com:/var/git/my_project . # or any equiv vcs cd my_project/etc ln -s live.config to_use.config </code></pre> <p>Then in the future</p> <pre><code>git pull # or any equiv vcs </code></pre> <p>I'd also like something that akin to FindBin, so that my configs can either use absolute paths, or relative to the current deployment. Given</p> <pre><code>/home/me/development/project/ bin lib etc/config </code></pre> <p>where /home/me/development/project/etc/config contains:</p> <pre><code>tmpl_dir: templates/ </code></pre> <p>when my perl code looks up the tmpl_dir configuration it'll get:</p> <pre><code>/home/me/development/project/templates/ </code></pre> <p>But on the live deployment:</p> <pre><code>/var/www/project/ bin lib etc/config </code></pre> <p>The same code would magically return</p> <pre><code>/var/www/project/templates/ </code></pre> <p>Absolute values in the config should be honoured, so that:</p> <pre><code>apache_config: /etc/apache2/httpd.conf </code></pre> <p>would return "/etc/apache2/httpd.conf" in all cases.</p> <p>Rather than a FindBin style approach, an alternative might be to allow configuration values to be defined in terms of other configuration values?</p> <pre><code>tmpl_dir: $base_dir/templates </code></pre> <p>I'd also like a pony ;)</p>
 

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