107 lines
3.3 KiB
Plaintext
107 lines
3.3 KiB
Plaintext
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#!/bin/bash
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USAGE="
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USAGE: xrsb-sched <action> [<when>] [<repeat>]
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action A comma or space separated list of actions to associate with the
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update signal.
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when The integer number of milliseconds to wait before sending the
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update signal, or one of the following values:
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- m to send the update signal at the top of the next minute
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- h to send the update signal at the top of the next hour
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- d to send the update signal at the top of the next day
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If not present, the update signal will be sent immediately.
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repeat If present, the update signal will be sent repeatedly according
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to <when>.
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EXAMPLES:
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If the daemon interprets the actions 'vol' and 'bl' to mean update the
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volume and backlight statuses, respectively, send a signal to
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immediately update both of those statuses.
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xsrb-sched 'vol,bl'
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If the daemon interprets the actions 'cpu' and 'mem' to mean update the
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cpu and memory usage statuses, respectively, send a signal to update
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both of those statuses every 5 seconds.
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xsrb-sched 'cpu,mem' 5000 1
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If the daemon interprets the actions 'bat' and 'dt' to mean update the
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battery and date/time statuses, respectively, send a signal to update
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both of those statuses at the top of every minute.
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xsrb-sched 'bat,dt' m true
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"
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DAEMON=xrsbd
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ACTION_DIR=/tmp/xrsb-action/
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# Convert integer milliseconds to floating point seconds
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ms_to_s () {
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printf '%.3f' "${1}e-3"
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}
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# Validate the arguments
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if [[ "$#" -lt 1 || "$#" -gt 3 ]]; then
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printf '%s' "${USAGE}" 1>&2
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exit 128
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fi
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IFS=', ' read -r -a actions <<< "$1"
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when="${2:-0}"
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repeat="$3"
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if [[ ! "${when}" =~ ^[0-9]+|[mhd]$ ]]; then
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printf 'Invalid argument <when>: %s\n' "${when}" 1>&2
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exit 128
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fi
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# Get the daemon PID so we can send the signal to it later. Getting the PID once
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# here is more efficient than getting it each time in the while loop, but if the
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# daemon is restarted and the PID changes, all subsequent updates will fail.
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daemon_pid="$(pgrep --newest --exact "${DAEMON}")"
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if [[ -z "${daemon_pid}" ]]; then
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printf 'The daemon %s is not running\n' "${DAEMON}" 1>&2
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exit 1
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fi
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# Send the signal if this is the first run or if repeat is on
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first_run=1
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while [[ "${first_run}" -eq 1 || -n "${repeat}" ]]; do
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first_run=0
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# Sleep until it's time to send the signal
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if [[ "${when}" != '0' ]]; then
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if [[ "${when}" =~ ^[0-9]+$ ]]; then
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sleep "$(ms_to_s "${when}")"
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else
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case "${when}" in
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m)
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sleep $((60 - $(date +%S)))
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;;
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h)
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readarray -t ms < <(date +'%M%n%S')
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sleep $((3600 - ms[0] * 60 - ms[1]))
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;;
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d)
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readarray -t hms < <(date +'%H%n%M%n%S')
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##sleep $(((24 - hms[0]) * 3600 - hms[1] * 60 - hms[2]))
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printf '%d\n' $(((24 - hms[0]) * 3600 - hms[1] * 60 - hms[2]))
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;;
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esac
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fi
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fi
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# Create the signal data and send the signal to the daemon
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if [[ "$(ps --no-headers -o '%c' -q "${daemon_pid}")" != "${DAEMON}" ]]; then
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printf 'The daemon %s is not running\n' "${DAEMON}" 1>&2
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exit 1
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fi
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for action in "${actions[@]}"; do touch "${ACTION_DIR}/${action}"; done
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kill -SIGUSR1 "${daemon_pid}"
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done
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