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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 loads 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 $((OPTIND - 1))
set +eu
# shellcheck source=/dev/null
. /etc/profile
# shellcheck source=/dev/null
. ~/.profile
set -eu
epoch() {
awk 'BEGIN { srand(); print(srand()) }'
}
now() {
date '+%Y-%m-%dT%H:%M:%S%:z'
}
pre() {
# Same as:
# sed -u "s|^|[$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)"
TIMEOUT='14400' # four hours
STATUS_F="$(mkstemp)"
OUT="$(mkstemp)"
send_email() {
FROM="cronjob@$HOSTNAME"
TO='root@localhost'
SUBJECT="(exit status: $(cat "$STATUS_F")) - $HOSTNAME: $CMD"
email -s "$SUBJECT" -f "$FROM" "$TO" < "$OUT"
rm -f "$OUT" "$STATUS_F"
}
trap send_email EXIT
{
cat <<-EOF
Running command: $CMD
Start at: $(now)
EOF
START="$(epoch)"
STATUS=0
timeout "$TIMEOUT" nice -n19 ionice -c3 "$@" || 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 "$OUT" >> "$XDG_LOG_HOME"/cronjobs.log
|
