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POIn a git-based CMS, how to uniquely identify files in git repository?
 

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  1. POIn a git-based CMS, how to uniquely identify files in git repository?
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    <p>I'm working on a simple CMS (based on Django, not that it matters) similar to <a href="http://github.com/mojombo/jekyll" rel="nofollow noreferrer">Jekyll</a> and <a href="http://ringce.com/hyde" rel="nofollow noreferrer">Hyde</a>, but dynamic instead of static. The idea is that the server has a copy of the repository, I can push stuff into that, and the CMS will automatically pick up the new content.</p> <p>Let's say that Markdown-formatted blog posts in my repository follow this file naming scheme:</p> <pre><code>/blog/2010/08/14/my-blog-post.md </code></pre> <p>Internally, the processed files will be cached in a SQLite database under a unique ID, for easy searching and fast serving.</p> <p>The problem is in constructing the URLs in such a way that they can be mapped to files in the repository. I see several options:</p> <ol> <li><p><code>/blog/2010/08/14/my-blog-post</code><br> If I simply map (part of) the URL to a filename, renaming a file will break all links pointing to that file. The content admin can leave a symlink in place of the old file, which the CMS can map into a HTTP redirect, but this requires work that is easy to forget.</p></li> <li><p><code>/blog/2010/08/14/271-my-blog-post</code><br> If I include a database ID in every URL, clearing or rebuilding the cache will invalidate all IDs, which is even worse. I would like the git repository to be the only thing representing the site's contents; everything else should be reconstructible from that.</p></li> <li><p><code>/blog/2010/08/14/528dc05-my-blog-post</code><br> The only thing uniquely identifying a file in the repo over time, as far as I can tell, is a pair (filename, SHA1). That file is guaranteed to exist in that commit, and we can trace it to the current HEAD through the git log.<br> (I won't include the full SHA1, but just enough to make collisions sufficiently unlikely. Will do the math later.)</p></li> </ol> <p>My question is twofold:</p> <ul> <li><p>Is there an easy and fast way in git to track a (filename, SHA1) pair through renames to the corresponding filename in the current HEAD?</p></li> <li><p>Is there a better way to accomplish my goals: not breaking existing URLs, but still allowing for renames and cache rebuilds?</p></li> </ul>
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