I've worked with Git to accomplish this before, but require Mercurial for another project. My Git recipe included a post-receive hook that looked like the following:

#!/bin/sh
GIT_WORK_TREE=/home/ec2-user/www
export GIT_WORK_TREE
git checkout -f

Which would refresh my working app directory every time I pushed to the remote repo on my server. I'd then run my app with Node-supervisor: supervisor server.js, which would watch for file changes and restart Node following a git push / file change.

My question is what's the best way to accomplish this with Mercurial. I've looked into the changegroup hook as a similar alternative, but I can't find any example hooks. Thanks!

Update: My Implementation

Per answer & comment below, I went with the changegroup hook. Specifically, in myrepo/.hg/hgrc I used:

[hooks]
changegroup = hg update && /path/to/restart/script.sh

I went with a basic shell script to restart Node vs. installing node-supervisor per above, for this project. It looks like this:

#!/bin/sh
echo "Restarting Server" >> /logpath/server.log
sudo pkill -x node
sudo node server.js >> /logpath/server.log &
echo "Changegroup Hook Executed, Server Restarted"
exit 0

I have only one Node process running, so pkill (all) works for me. I'm also running the server.js straight out of my repo directory.

Try the Hooks part of the Red Bean book. Especially scrolling down to the Hooks Reference portion may be of use, e.g.:

changegroup—after remote changesets added