This script is used to remove offline gitlab runners for every projects

gitlab-runner-cleanup.sh

#!/bin/bash
###
# This script is used to remove offline gitlab runners for every projects
###

set -o nounset
set -o errexit

die () {
    echo >&2 "$@"
    exit 1
}

# Required tools:
# curl
# jq
# tr

[ "$#" -ge 1 ] || die "1 argument required, $# provided"

runnerId=$1

gitlabUrl=https://gitlaburl/gitlab  # todo: point to gitlab url to cleanup
gitlabApiToken="myapitoken"  # todo: fill with admin api token


# Which runners are online?
onlineRunnerIds=$(curl --fail --silent --header "PRIVATE-TOKEN: ${gitlabApiToken}" "${gitlabUrl}/api/v4/runners?scope=online&per_page=10000000000000000000000" | jq -r '.[].id' | sed 's|[^0-9]||g')

for id in ${onlineRunnerIds}; do
	if [ "$id" == "$runnerId" ]; then
		die "skipping deletion of ${runnerId} because runner is online"
	fi
done

# Remove runners
echo "unregistering ${runnerId}"
url="${gitlabUrl}/api/v4/runners/${runnerId}"
projects=$(curl --fail --silent --header "PRIVATE-TOKEN: ${gitlabApiToken}" "${url}" | jq ".projects[].id"| sed 's|[^0-9]||g')
for project in ${projects}; do
	echo "${gitlabUrl}/api/v4/projects/${project}/runners/${runnerId}"
	echo $(curl --fail --silent --request DELETE --header "PRIVATE-TOKEN: ${gitlabApiToken}" "${gitlabUrl}/api/v4/projects/${project}/runners/${runnerId}")
done

echo "deleting ${runnerId}"
echo "${gitlabUrl}/api/v4/runners/${runnerId}"

echo $(curl --fail --silent --request DELETE --header "PRIVATE-TOKEN: ${gitlabApiToken}" "${gitlabUrl}/api/v4/runners/${runnerId}")