A git hook is a script placed in a special location of your repository, that location is:
.git/hooks
The script can be any kind that you can execute in your environment i.e. bash, python, ruby etc.
The hook that is executed after a checkout is post-checkout. From the docs:
…The hook is given three parameters…
Example:
-
Create the hook (script):
touch .git/hooks/post-checkout chmod u+x .git/hooks/post-checkout
-
Hook sample content:
#!/bin/bash
set -e
printf '\npost-checkout hook\n\n'
prevHEAD=$1
newHEAD=$2
checkoutType=$3
[[ $checkoutType == 1 ]] && checkoutType="branch" ||
checkoutType="file" ;
echo 'Checkout type: '$checkoutType
echo ' prev HEAD: '`git name-rev --name-only $prevHEAD`
echo ' new HEAD: '`git name-rev --name-only $newHEAD`
Note: The shebang in the first line indicates the type of script.
This script (git hook) will only capture the three parameters passed and print them in a human-friendly format.