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|
#!/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@$HOSTNAME"
TIMEOUT='14400' # four hours
STATUS_F="$(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
|
