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https://github.com/yavook/kiwi-cron.git
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version with cron-exec script
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4 changed files with 182 additions and 21 deletions
22
Dockerfile
22
Dockerfile
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@ -2,10 +2,22 @@ FROM alpine:latest
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RUN set -ex; \
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\
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mkdir /etc/periodic/5min; \
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chmod 755 /etc/periodic/5min;
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mkdir -pm 755 /kiwi-cron; \
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cd /kiwi-cron; \
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mkdir -pm 755 \
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every/5_minutes \
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every/15_minutes \
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hourly \
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daily \
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weekly \
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monthly \
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yearly \
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; \
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\
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apk --no-cache add \
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docker-cli \
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;
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ENTRYPOINT [ "/usr/sbin/crond" ]
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CMD [ "-fd", "8" ]
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COPY cron-exec /usr/local/bin/
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COPY crontab /var/spool/cron/crontabs/root
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CMD [ "cron-exec" ]
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21
README.md
21
README.md
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@ -8,11 +8,18 @@ Simple cron-jobs for [`kiwi-scp`](https://github.com/ldericher/kiwi-scp)
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## Quick start
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kiwi-cron comes with a pre-loaded cron daemon for periodic jobs. Just drop your executables into the relevant directory under `/etc/periodic/` and that's it.
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kiwi-cron comes with a pre-configured cron daemon for periodic jobs.
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Just drop your scripts into the relevant directory under `/kiwi-cron/` and that's it.
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- `/etc/periodic/5min` -- is run every 5 minutes
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- `/etc/periodic/15min` -- is run every 15 minutes
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- `/etc/periodic/hourly` -- is run every full hour
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- `/etc/periodic/daily` -- is run every day at 2am
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- `/etc/periodic/weekly` -- is run every saturday at 3am
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- `/etc/periodic/month` -- is run on the first day of every month at 5am
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- `/kiwi-cron/hourly` – is run every full hour
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- `/kiwi-cron/daily` – is run every day at 2 am
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- `/kiwi-cron/weekly` – is run every saturday at 3 am
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- `/kiwi-cron/monthly` – is run on the first day of every month at 5 am
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- `/kiwi-cron/yearly` and `/kiwi-cron/annually` – is run on every January 1st at 12 am
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## `/kiwi-cron/every` directory
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You can use directories like `/kiwi-cron/every/5_minutes` to run scripts every 5 minutes.
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`kiwi-cron` automatically picks up on that format and generates cron schedules for you.
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You can define schedules to be run every N minutes, hours, days, or months that way.
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151
cron-exec
Executable file
151
cron-exec
Executable file
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@ -0,0 +1,151 @@
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#!/bin/sh
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crontab_append () {
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crontab="$(
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printf '%s\n%s' \
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"${crontab}" "${1}"
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)"
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}
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print_cron_schedule() {
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cas_min="${1}"
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cas_hour="${2}"
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cas_day="${3}"
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cas_month="${4}"
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cas_weekday="${5}"
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cas_command="${6}"
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printf '%-8s%-8s%-8s%-8s%-8s%s\n' \
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"${cas_min}" "${cas_hour}" "${cas_day}" "${cas_month}" "${cas_weekday}" "${cas_command}"
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}
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crontab='# crontab generated for kiwi-cron'
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crontab_append '# generation time: '"$(date)"
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crontab_append '#'
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crontab_append "$(
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print_cron_schedule \
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"# min" "hour" "day" "month" "weekday" "command"
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)"
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# check *ly dirs in root directory
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schedule_dirs="$(
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find "/kiwi-cron" -type d -name "*ly" -mindepth 1 -maxdepth 1
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)"
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for schedule_dir in ${schedule_dirs}; do
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# count files in scheduler directory
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schedule_filecount="$(
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find "${schedule_dir}" -type f -mindepth 1 -maxdepth 1 \
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| wc -l
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)"
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# ignore if empty
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if [ "${schedule_filecount}" -eq "0" ]; then
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continue
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fi
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# infer cron schedule by directory name
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units="${schedule_dir##*/}"
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case "${units}" in
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hourly)
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crontab_append "$(
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print_cron_schedule \
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"0" "*" "*" "*" "*" "run-parts '${schedule_dir}'"
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)"
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;;
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daily)
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crontab_append "$(
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print_cron_schedule \
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"0" "2" "*" "*" "*" "run-parts '${schedule_dir}'"
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)"
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;;
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weekly)
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crontab_append "$(
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print_cron_schedule \
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"0" "3" "*" "*" "6" "run-parts '${schedule_dir}'"
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)"
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;;
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monthly)
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crontab_append "$(
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print_cron_schedule \
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"0" "5" "1" "*" "*" "run-parts '${schedule_dir}'"
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)"
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;;
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yearly|annually)
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crontab_append "$(
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print_cron_schedule \
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"0" "0" "1" "1" "*" "run-parts '${schedule_dir}'"
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)"
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;;
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esac
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done
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# check dirs in "every" subdirectory
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every_schedule_dirs="$(
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find "/kiwi-cron/every" -type d -mindepth 1 -maxdepth 1
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)"
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for schedule_dir in ${every_schedule_dirs}; do
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# count files in scheduler directory
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schedule_filecount="$(
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find "${schedule_dir}" -type f -mindepth 1 -maxdepth 1 \
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| wc -l
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)"
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# ignore if empty
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if [ "${schedule_filecount}" -eq "0" ]; then
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continue
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fi
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# infer cron schedule by directory name
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schedule="${schedule_dir##*/}"
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every="$( echo "${schedule}" | awk -F_ '{print $1}' )"
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units="$( echo "${schedule}" | awk -F_ '{print $2}' )"
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units="${units%s}"
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# generate valid random values
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rand_min=$(( RANDOM % 60 ))
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# rand_hour=$(( RANDOM % 24 ))
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# generating nighttime values seems like a good idea!
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rand_hour=$(( (RANDOM % 7 + 21) % 24 ))
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rand_day=$(( RANDOM % 31 + 1 ))
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case "${units}" in
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minute)
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crontab_append "$(
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print_cron_schedule \
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"*/${every}" "*" "*" "*" "*" "run-parts '${schedule_dir}'"
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)"
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;;
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hour)
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crontab_append "$(
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print_cron_schedule \
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"${rand_min}" "*/${every}" "*" "*" "*" "run-parts '${schedule_dir}'"
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)"
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;;
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day)
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crontab_append "$(
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print_cron_schedule \
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"${rand_min}" "${rand_hour}" "*/${every}" "*" "*" "run-parts '${schedule_dir}'"
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)"
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;;
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month)
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crontab_append "$(
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print_cron_schedule \
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"${rand_min}" "${rand_hour}" "${rand_day}" "*/${every}" "*" "run-parts '${schedule_dir}'"
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)"
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;;
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esac
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done
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# replace crontab
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echo "${crontab}" | crontab -
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exec crond -fd 8
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9
crontab
9
crontab
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@ -1,9 +0,0 @@
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# cron jobs by kiwi-scp
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#
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# min hour day month weekday command
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*/5 * * * * run-parts /etc/periodic/5min
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*/15 * * * * run-parts /etc/periodic/15min
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0 * * * * run-parts /etc/periodic/hourly
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0 2 * * * run-parts /etc/periodic/daily
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0 3 * * 6 run-parts /etc/periodic/weekly
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0 5 1 * * run-parts /etc/periodic/monthly
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