1 files changed, 169 insertions, 0 deletions
diff --git a/src/scripts/cronjob.sh b/src/scripts/cronjob.sh
new file mode 100755
index 0000000..4cd456e
--- /dev/null
+++ b/src/scripts/cronjob.sh
@@ -0,0 +1,169 @@
+#!/bin/sh
+set -eu
+
+usage() {
+	cat <<-'EOF'
+		Usage:
+		  cronjob COMMAND...
+		  cronjob -h
+	EOF
+}
+
+help() {
+	cat <<-'EOF'
+
+
+		Options:
+		  -h, --help    show this message
+
+		  COMMAND       the command to be executed
+
+
+		Execute the given command, and send the output to email, with
+		special treatment to the status code.  It kills the job it it
+		lasts more than one hour.
+
+		It load the appropriate files, so that the actual cron
+		declaration is smaller.
+
+
+		Examples:
+
+		  Run a backup:
+
+		    $ cronjob backup -q cron
+	EOF
+}
+
+
+for flag in "$@"; do
+	case "$flag" in
+		--)
+			break
+			;;
+		--help)
+			usage
+			help
+			exit
+			;;
+		*)
+			;;
+	esac
+done
+
+while getopts 'h' flag; do
+	case "$flag" in
+		h)
+			usage
+			help
+			exit
+			;;
+		*)
+			usage >&2
+			exit 2
+			;;
+	esac
+done
+shift $((OPTIND - 1))
+
+if [ -z "${1:-}" ]; then
+	printf 'Missing COMMAND.\n\n' >&2
+	usage >&2
+	exit 2
+fi
+
+if [ "$(id -un)" != 'root' ]; then
+	printf 'This script must be run as root.\n\n' >&2
+	usage >&2
+	exit 2
+fi
+
+
+set +eu
+# shellcheck source=/dev/null
+. /etc/rc
+set -eu
+
+
+
+epoch() {
+	awk 'BEGIN { srand(); print(srand()); }'
+}
+
+now() {
+	date '+%Y-%m-%dT%H:%M:%S%:z'
+}
+
+
+uuid() {
+	od -xN20 /dev/random |
+		head -n1 |
+		awk '{OFS="-"; print $2$3,$4,$5,$6,$7$8$9}'
+}
+
+mkstemp() {
+	name="${TMPDIR:-/tmp}/uuid-tmpname with spaces.$(uuid)"
+	touch "$name"
+	printf '%s' "$name"
+}
+
+pre() {
+	# Same as:
+	# sed -u "s|^|[$CMD]: |"
+	# but the "-u" option is not POSIX
+	IFS=''
+	while read -r line; do
+		printf '[%s]: %s\n' "$CMD" "$line"
+	done
+}
+
+duration() {
+	minutes=$((${1} / 60))
+	seconds=$((${1} % 60))
+	printf '%sm%ss' "$minutes" "$seconds"
+}
+
+
+CMD="$*"
+HOSTNAME="$(hostname)"
+FROM="cronjob@$HOSTNAME"
+TIMEOUT='10800' # three hours
+STATUS_F="$(mkstemp)"
+OUT="$(mkstemp)"
+
+email() {
+	{
+		cat <<-EOF
+			Content-Type: text/plain; charset=UTF-8
+			Content-Transfer-Encoding: 8bit
+			From: $FROM
+			To: root@localhost
+			Subject: (exit status: $(cat "$STATUS_F")) - $HOSTNAME: $CMD
+
+		EOF
+		cat "$OUT"
+	} | sendmail -t -f "$FROM"
+	rm -f "$OUT" "$STATUS_F"
+}
+trap email EXIT
+
+{
+	cat <<-EOF
+		Running commad: $CMD
+		Starting at: $(now)
+
+	EOF
+
+	START="$(epoch)"
+	STATUS=0
+	timeout "$TIMEOUT" "$@" || STATUS=$?
+	printf '%s' "$STATUS" > "$STATUS_F"
+	END="$(epoch)"
+	DURATION_SECONDS=$((END - START))
+
+	cat <<-EOF
+
+		Finished at: $(now)
+		Duration: $(duration "$DURATION_SECONDS")
+	EOF
+} 2>&1 | pre | ts '%Y-%m-%dT%H:%M:%S' | tee "$OUT" >> /var/log/cronjobs.log