90 lines
2 KiB
Bash
Executable file
90 lines
2 KiB
Bash
Executable file
#!/usr/bin/env bash
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# usage
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usage() {
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USAGE=$(
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cat <<EOF
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Usage: check_updates
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Sends out update notifications. Please see man check_updates.
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EOF
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)
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echo "$USAGE"
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}
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set -e
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# check for config file
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apply_config() {
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local config=$1
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if [[ ! -f "$config" ]]; then
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echo "No config file specified"
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echo ""
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usage
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exit 1
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fi
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set -a
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# shellcheck disable=SC1090
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source "$config"
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set +a
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}
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source_config() {
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local configFallback=$1
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local configGlobalFallback=$2
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if [[ -f "$configFallback" ]]; then
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apply_config "$configFallback"
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return
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fi
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if [[ -f "$configGlobalFallback" ]]; then
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apply_config "$configGlobalFallback"
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return
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fi
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}
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apply_defaults() {
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[[ -z ${CHECK_UPDATES_UPDATES_CMD} ]] && CHECK_UPDATES_UPDATES_CMD="/usr/bin/checkupdates"
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[[ -z ${CHECK_UPDATES_UPDATES_AMOUNT_CMD} ]] && CHECK_UPDATES_UPDATES_AMOUNT_CMD="/usr/bin/checkupdates | wc -l"
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}
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check_required() {
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if [[ -z ${CHECK_UPDATES_UPDATES_CMD} ]]; then
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echo "CHECK_UPDATES_UPDATES_CMD is required"
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exit 1
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fi
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if [[ -z ${CHECK_UPDATES_UPDATES_AMOUNT_CMD} ]]; then
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echo "CHECK_UPDATES_UPDATES_AMOUNT_CMD is required"
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exit 1
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fi
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if [[ -z ${CHECK_UPDATES_MAIL_ADDRESS} ]]; then
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echo "CHECK_UPDATES_MAIL_ADDRESS is required"
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exit 1
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fi
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type hostname &> /dev/null || { echo "Requiring 'hostname' but it's not installed"; exit 1; }
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type mailx &> /dev/null || { echo "Requiring 'mailx' but it's not installed"; exit 1; }
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}
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source_config "$HOME/.check_updates.conf" "/etc/check_updates.conf"
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apply_defaults
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check_required
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HOSTNAME=$(hostname)
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CHECK_UPDATES_UPDATES=$(eval "${CHECK_UPDATES_UPDATES_CMD}")
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CHECK_UPDATES_UPDATES_AMOUNT=$(eval "${CHECK_UPDATES_UPDATES_AMOUNT_CMD}")
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if [[ "$CHECK_UPDATES_UPDATES_AMOUNT" -gt "0" ]]; then
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SUBJECT="[updates ${HOSTNAME}]"
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MESSAGE=$(
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cat <<EOF
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There are ${CHECK_UPDATES_UPDATES_AMOUNT} updates available on ${HOSTNAME}.
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${CHECK_UPDATES_UPDATES};
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EOF
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)
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echo "$MESSAGE" | mailx -Ssendwait -s "$SUBJECT" "$CHECK_UPDATES_MAIL_ADDRESS"
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fi
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