#!/bin/bash
set -x

if [ -z $GIT_COMMIT ]; then
    echo "Expected env var 'GIT_COMMIT' to be set. Exiting..."
    exit 1
fi

echo "Check that only alert confings are being pushed"
echo "$PWD"

for file in $(git diff-tree -r --name-only ${GIT_COMMIT}^1 ${GIT_COMMIT}); do
    new_id=$(grep ^id\: $file)
    if [ ! -z "$new_id" ]; then
        total_id=$(grep "$new_id" alert_configs/*.yaml | wc -l)
        if [ $total_id -gt 1 ] ; then
            echo "Duplicated id found! Please update the id of the alert configuration"
            exit 1
        fi
    fi
    dir=$(dirname ${file})
    # alert_configs/ change triggers a test of the new or changed aler configs
    if [ "$dir" == "alert_configs" ] || [ "$dir" == "alert_routing_lookup" ] ; then
        echo "Good to merge"
        exit 0
    else
        echo "Only automatic merges allowed for alert config files"
        exit 1
    fi
done