@title Arcanist User Guide: Repository Hooks
@group userguide

Describes how to set up Arcanist as an SVN pre-commit hook.

= Installing Arcanist SVN Hooks =

You can install Arcanist as an SVN pre-commit hook, to reject commits which
contain lint errors. The immediate value of this is that syntax errors won't
be committable, but you can block other kinds of badness with appropriate lint
engines.

To install Arcanist as a pre-commit hook, add this to your svn/hooks/pre-commit:

  #!/bin/sh
  /usr/local/bin/php -f /path/to/arcanist/bin/arc svn-hook-pre-commit $@ 1>&2

Make sure you make this file executable, or you'll get an error for every commit
with an unhelpful error message. You also need to specify the full path to PHP
since SVN nukes ENV before executing scripts. Alternatively you can specify
PATH explicitly.

If your project is configured to run linters or lint engines which aren't part
of Arcanist, specify where to load them from with ##--load-phutil-library##:

  --load-phutil-library=/path/to/library/root

Since SVN commit hooks run without access to a working copy, you'll need to keep
one checked out somewhere and reference it with ##--load-phutil-library## if you
build new linters or customize lint engines. For example, your hook might
look like this:

  #!/bin/sh
  /usr/local/bin/php -f /path/to/arcanist/bin/arc svn-hook-pre-commit \
    --load-phutil-library=/path/to/custom/lint/engine \
    --load-phutil-library=/path/to/custom/unittest/engine \
    $@ 1>&2