Update submodules automatically after checkout when HEAD changes

README

Update submodules automatically after checkout
----------------------------------------------

Put the file post-checkout in .git/hooks/

Make it executable
(chmod u+x .git/hooks/post-checkout)

Never update your submodules manually again (unless something goes horribly wrong)!

post-checkout

#!/bin/sh

# Third parameter of post-checkout hook is 1 if the branch changed and
# it's 0 if the chechout was to restore the state of a file. We only
# want to update the submodules when the HEAD changes.
HEAD_CHANGED=$3

if [ $HEAD_CHANGED = "1" ]
    then
    echo "Updating Submodules ============="
    git submodule update --init --recursive
    echo "Subodules updated ==============="
fi