execline-cron

cron-exec

#!/bin/execlineb -S2
unexport CRON_SOCK
unexport CRON_TEMP
pipeline {
  fdmove -c 2 1
  importas -u base CRON_BASE
  unexport CRON_MAIL
  foreground { ${base}/${1}/${2} }
  importas -u exitval ?
  if -t { test ${exitval} -gt 0 }
  echo cron: ${2} exited with error ${exitval}
}
backtick -n tmpfile { s6-uniquename /tmp/ }
importas -u tmpfile tmpfile
seekablepipe ${tmpfile}
if -t { grep -q . /proc/self/fd/0 }
importas -u mail CRON_MAIL
if -t { test -n ${mail} }
mailx -s "cron: failure in ${1} job '${2}'" ${mail}

cron-runner

#!/bin/execlineb -P
if {
  backtick -n uid { id -u }
  importas -u uid uid
  if { mkdir -p rules/uid/${uid} }
  touch rules/uid/${uid}/allow
}
importas -u sock CRON_SOCK
s6-ipcserver -1 ${sock}
s6-ipcserver-access -v 0 -E -i rules
s6-sudod -012 -t 1000 fdmove -c 1 2 cron-exec

cron-runner\run

#!/bin/execlineb -P
importas XDG_CONFIG_HOME XDG_CONFIG_HOME
s6-envdir -fi ${XDG_CONFIG_HOME}/cron/env
cron-runner

cron-scheduler

#!/bin/execlineb -P
multisubstitute {
  importas -u base CRON_BASE
  importas -u sock CRON_SOCK
  importas -u temp CRON_TEMP
}
if {
  forx group { hourly daily weekly monthly yearly }
  importas -u group group
  redirfd -w 2 /dev/null
  cd ${base}/${group}
  fdmove -c 2 1
  if { mkdir -p ${temp} }
  if {
    backtick -n period {
      heredoc 0 ${group}
      sed -e s/ly// -e s/dai/day/
    }
    importas -u period period
    backtick -n ref { date -d "1 ${period} ago" -u "+%Y-%m-%dT%H:59:59Z" }
    importas -u ref ref
    touch -d ${ref} ${temp}/reference
  }
  elglob -0 jobs *
  forx job { ${jobs} }
  importas -u job job
  if { test -x ${job} }
  if -nt {
    backtick -n found {
      redirfd -w 2 /dev/null
      find ${temp}/${group}/${job} -prune -newer ${temp}/reference
    }
    importas -u found found
    test -n ${found}
  }
  if { echo running job ${job} from group ${group} }
  if { s6-sudo -e ${sock} ${group} ${job} }
  if { mkdir -p ${temp}/${group} }
  touch ${temp}/${group}/${job}
}
sleep 1800

cron-scheduler\run

#!/bin/execlineb -P
importas XDG_CONFIG_HOME XDG_CONFIG_HOME
s6-envdir -fi ${XDG_CONFIG_HOME}/cron/env
cron-scheduler

example_env

.config/cron/env/CRON_BASE:/home/me/.config/cron
.config/cron/env/CRON_MAIL:admin@example.org
.config/cron/env/CRON_SOCK:/run/user/me/cron
.config/cron/env/CRON_TEMP:/home/me/.cache/cron