when ci scheduler is big meanie

citag.sh

#!/usr/bin/env bash

# Github is a big meanie disabling your scheduled workflows?
# Not a problem, just schedule ci jobs by pushing git tags!

# echo git@github.com:user/repo-c.git git@github.com:user/repo-d.git | ./citag.sh git@github.com:user/repo-a.git https://github.com/user/repo-b.git
# 42 */12 * * * /foo/bar/citag git@github.com:user/repo.git

set -o errexit
set -o nounset
set -o pipefail

usage() {
    set +o xtrace
    # docopt syntax
    echo "Usage: $(basename "${BASH_SOURCE[0]}") [-t=tag] [-v] [-h] [--] (<url>...|-)
Create or refresh git tags.
Repo URLs will be read from arguments or stdin.
Options:
  -t    Tag literal to be used
  -v    Enable verbose output
  -h    Print help and exit"
}

tag() {
    url="${1}"

    # fetch bare repo
    local dir
    dir="$(mktemp -d)"
    if ! git clone --bare "${url}" "${dir}"; then
        printf >&2 'Failed to clone: %s\n\n' "${url}"
        return
    fi
    cd "${dir}"

    # delete tag
    git tag -d "${tag}" || true
    if git push --delete origin "${tag}"; then
        # if we continue directly, the tag
        # might still exist on the server.
        sleep 1
    fi

    # (re)create tag
    git tag "${tag}" master
    git push origin "${tag}"

    printf >&2 'Successfuly tagged: %s\n' "${url}"

    # cleanup
    rm -rf "${dir}"
}

tag="citag"
while getopts t:vh opt; do
    case $opt in
    t) tag="$OPTARG" ;;
    v) set -o xtrace ;;
    h)
        usage
        exit 0
        ;;
    *)
        usage
        exit 1
        ;;
    esac
done
shift $((OPTIND - 1))

if [[ -z "${tag}" ]]; then
    printf >&2 'Empty tag is not allowed!\n'
    exit 1
fi

# get urls from args
urls=("$@")

# get urls from stdin
if [[ -p /dev/stdin ]]; then
    while IFS= read -r line; do
        for word in ${line}; do
            urls+=("${word}")
        done
    done
fi

if [[ ${#urls[@]} -eq 0 ]]; then
    usage
    exit 1
fi

for url in "${urls[@]}"; do
    tag "${url}" &
done

wait