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The best way to run ikiwiki in a [[Subversion]] post-commit hook is using a wrapper, which can be generated using ikiwiki --wrapper.

First, set up the subversion checkout that ikiwiki will update and compile into your wiki at each subversion commit. Run ikiwiki a few times by hand to get a feel for it. Now, generate the wrapper by adding "--wrapper" to whatever command line you've been using to run ikiwiki. For example:

~/wiki-checkout> ikiwiki . ~/public_html/wiki
~/wiki-checkout> ikiwiki . ~/public_html/wiki --wrapper
successfully generated ikiwiki-wrap

The generated wrapper is a C program that is designed to safely be made suid if necessary. It's hardcoded to run ikiwiki with the settings specified when you ran --wrapper, and can only be used to update and compile that one checkout into the specified html directory.

Now, put the wrapper somewhere convenient, and create a post-commit hook script in your subversion repository for the wiki. All the post-commit hook has to do is run the wrapper (with no parameters).

Depending on your Subversion setup, the post-commit hook might end up getting called by users who have write access to subversion, but not to your wiki checkout and html directory. If so, you can safely make ikiwiki-wrap suid to a user who can write there (not to root!). You might want to read [[Security]] first.