source: SaveSpace.git/hooks/pre-push.sample@ c5e383e

#!/bin/sh

# An example hook script to verify what is about to be pushed.  Called by "git
# push" after it has checked the remote status, but before anything has been
# pushed.  If this script exits with a non-zero status nothing will be pushed.
#
# This hook is called with the following parameters:
#
# $1 -- Name of the remote to which the push is being done
# $2 -- URL to which the push is being done
#
# If pushing without using a named remote those arguments will be equal.
#
# Information about the commits which are being pushed is supplied as lines to
# the standard input in the form:
#
#   <local ref> <local oid> <remote ref> <remote oid>
#
# This sample shows how to prevent push of commits where the log message starts
# with "WIP" (work in progress).

remote="$1"
url="$2"

zero=$(git hash-object --stdin </dev/null | tr '[0-9a-f]' '0')

while read local_ref local_oid remote_ref remote_oid
do
        if test "$local_oid" = "$zero"
        then
                # Handle delete
                :
        else
                if test "$remote_oid" = "$zero"
                then
                        # New branch, examine all commits
                        range="$local_oid"
                else
                        # Update to existing branch, examine new commits
                        range="$remote_oid..$local_oid"
                fi

                # Check for WIP commit
                commit=$(git rev-list -n 1 --grep '^WIP' "$range")
                if test -n "$commit"
                then
                        echo >&2 "Found WIP commit in $local_ref, not pushing"
                        exit 1
                fi
        fi
done

exit 0