Mercurial Changegroup hook varies based on branches

Question

Is there an existing hook in Mercurial which, like changegroup, allows actions to take place on a push, but allows me to do multiple actions (or vary them) based on which branches are affected by the changesets therein?

For example, I need to notify a listener at an url when a push is made but ideally it would notify different urls based on which branch is affected without just blanketing them all.

Answer 1

There are no branch-specfic hooks, but you can do that logic in the hook itself. For example in your hgrc:

[hooks]
changeset = actions-by-branch.sh

and then in your actions-by-branch.sh you'd do:

#!/bin/bash
BRANCH=$(hg log --template '{branch}' -r $HG_NODE)
BRANCH=${BRANCH:-default}  # set value to 'default' if it was empty

if [ "$BRANCH" == "default" ] ; then
   do something
elif [ "$BRANCH" == "release" ] ; then
   do something else
else
   do a different thing
fi

Notice that I used a changeset rather than changegroup hook. A single changegroup can have changesets on multiple branches, which would complicate the logic. If you do decide to go that route you need to loop from $HG_NODE all the way to tip to act on each changeset in the changegroup.