0k-charms/cron/hooks/pre_deploy

#!/bin/bash

. lib/common

set -e

root_crontab="$SERVICE_CONFIGSTORE/etc/crontabs/root"

cron_content=$(set pipefail; cron:entries | tr '\0' '\n') || {
    err "Failed to make cron entries" >&2
    exit 1
}
if [ -z "${cron_content::1}" ]; then
    err "Unexpected empty scheduled command list."
    exit 1
fi
if [ -e "$root_crontab" ]; then
    if ! [ -f "$root_crontab" ]; then
        err "Destination '$root_crontab' exists and is not a file."
        exit 1
    fi
    current_content=$(cat "$root_crontab")
    if [ "$current_content" = "$cron_content" ]; then
        info "Cron entry already up to date."
        exit 0
    fi
fi


if ! [ -d "${root_crontab%/*}" ]; then
    mkdir -p "${root_crontab%/*}"
fi

printf "%s\n" "$cron_content" > "$root_crontab"
## Busybox cron uses cron.update file to rescan new cron entries
## cf: https://git.busybox.net/busybox/tree/miscutils/crond.c#n1089
touch "${root_crontab%/*}/cron.update"

info "Cron entry updated ${GREEN}successfully${NORMAL}."