#!/bin/sh

# This is post-merge git hook script to check for changes in:
# * git hook scripts
# * helper scripts for using git efficiently.
# If any changes are detected, a diff of them is printed.
#
# To install this script, copy it to .git/hooks/post-merge in local copy of
# tor git repo and make sure it has permission to execute.

git_toplevel=$(git rev-parse --show-toplevel)

check_for_diffs() {
        installed="$git_toplevel/.git/hooks/$1"
        latest="$git_toplevel/scripts/maint/$1.git-hook"

        if [ -e "$installed" ]
        then
               if ! cmp "$installed" "$latest" >/dev/null 2>&1
               then
                        echo "ATTENTION: $1 hook has changed:"
                        echo "==============================="
                        diff "$installed" "$latest"
               fi
        fi
}

check_for_script_update() {
        fullpath="$git_toplevel/scripts/maint/$1"

        if ! git diff ORIG_HEAD HEAD --exit-code -- "$fullpath" >/dev/null
        then
                echo "ATTENTION: $1 has changed:"
                git diff ORIG_HEAD HEAD -- "$fullpath"
        fi
}

check_for_diffs "pre-push"
check_for_diffs "pre-commit"
check_for_diffs "post-merge"

check_for_script_update "git-merge-forward.sh"
check_for_script_update "git-pull-all.sh"
check_for_script_update "git-push-all.sh"