src/cronjob: Add simplified version

1 files changed, 69 insertions, 0 deletions

diff --git a/src/cronjob b/src/cronjob
new file mode 100755
index 0000000..1adf29a
--- /dev/null
+++ b/src/cronjob
@@ -0,0 +1,69 @@
+#!/bin/sh
+set -eu
+
+
+usage() {
+	cat <<-'EOF'
+		Usage: cronjob COMMAND...
+	EOF
+}
+
+
+if [ -z "${1:-}" ]; then
+	printf 'Missing COMMAND.\n\n' >&2
+	usage >&2
+	exit 2
+fi
+
+
+
+duration() {
+	minutes=$((${1} / 60))
+	seconds=$((${1} % 60))
+	printf '%sm%ss' "$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: $(timestamp -E)
+
+	EOF
+
+	START="$(now)"
+	STATUS=0
+	timeout "$TIMEOUT" "$@" || STATUS=$?
+	printf '%s' "$STATUS" > "$STATUS_F"
+	END="$(now)"
+	DURATION_SECONDS=$((END - START))
+
+	cat <<-EOF
+
+		Finished at: $(timestamp -E)
+		Duration: $(duration "$DURATION_SECONDS")
+	EOF
+} 2>&1 | pre | ts '%Y-%m-%dT%H:%M:%S' | tee "$OUT" >> /var/log/cronjobs.log