135 lines
4.3 KiB
Bash
Executable file
135 lines
4.3 KiB
Bash
Executable file
#!/bin/bash
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# Version: 0.4.0-daemon-runuser
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# Copyright (c) 2005-2022:
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# Darren 'Tadgy' Austin <darren (at) afterdark.org.uk>
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# Licensed under the terms of the GNU General Public License version 3.
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SERVICE_EXEC="%BUILD_PREFIX%/EDITME"
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SERVICE_ARGS=('EDITME')
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SERVICE_RUNUSER="EDITME"
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DAEMON_EXEC="/usr/bin/daemon"
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DAEMON_ARGS=('-N' '-n' "${0##*rc.}" '-r' '-a' '60' '-A' '5' '-L' '3600' '-M' '3' '-l' 'daemon.err' '-b' 'daemon.debug' '-o' 'daemon.info')
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# Allow configuration in /etc/default to override.
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# Additional available variables:
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# SERVICE_ENVIRONMENT=() # Extra environment passed to $SERVICE_EXEC. Must be an array.
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# SERVICE_EXTRA_ARGS=() # Extra arguments passed to $SERVICE_EXEC. Must be an array.
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# SERVICE_RUNUSER="" # Username to run the service as. Default: User who starts the script.
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# DAEMON_ENVIRONMENT=() # Extra environment passed to $DAEMON_EXEC. Must be an array.
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# DAEMON_EXTRA_ARGS=() # Extra arguments passed to $DAEMON_EXEC. Must be an array.
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# SLAY_DELAY="" # Delay between the SIGTERM and SIGKILL on a 'stop'. Default: 2s.
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# RESTART_DELAY="" # Delay between stopping and starting on a 'restart'. Default: 2s.
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# shellcheck disable=SC1090
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[[ -e "/etc/default/${0##*rc.}" ]] && { source "/etc/default/${0##*rc.}" || return 1 2>/dev/null || exit 1; }
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error() {
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printf "%s: %s\\n" "${BASH_SOURCE[0]##*/}" "$*" >&2
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}
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checkconfigured() {
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# This function can be used to perform any pre-start tests; hopfully to insure the daemon
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# can start correctly, before actually trying to start it. A return value of 0 means the
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# tests were passed and the daemon should be started. Any other value prevents the
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# daemon from being started, and an error message will be emitted.
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return 0
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}
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checkstatus() {
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id "${SERVICE_RUNUSER:-$(whoami)}" >/dev/null 2>&1 || {
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error "invalid user: ${SERVICE_RUNUSER:-$(whoami)}"
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return 2
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}
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if su - "${SERVICE_RUNUSER:-$(whoami)}" -c "\"$DAEMON_EXEC\" --running -n \"${0##*rc.}\""; then
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printf "%s: %s: %s\\n" "${BASH_SOURCE[0]##*/}" "${SERVICE_EXEC##*/}" "running"
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return 0
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else
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printf "%s: %s: %s\\n" "${BASH_SOURCE[0]##*/}" "${SERVICE_EXEC##*/}" "stopped"
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return 1
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fi
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}
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startdaemon() {
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local EXEC
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for EXEC in "$SERVICE_EXEC" "$DAEMON_EXEC"; do
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if [[ ! -e "$EXEC" ]]; then
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error "not found: $EXEC"
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return 2
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elif [[ ! -x "$EXEC" ]]; then
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error "not executable: $EXEC"
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return 2
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fi
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done
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id "${SERVICE_RUNUSER:-$(whoami)}" >/dev/null 2>&1 || {
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error "invalid user: ${SERVICE_RUNUSER:-$(whoami)}"
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return 2
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}
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checkconfigured || {
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error "not started - pre-start checks failed"
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return 2
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}
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su - "${SERVICE_RUNUSER:-$(whoami)}" -c "${DAEMON_ENVIRONMENT:+declare ${DAEMON_ENVIRONMENT[*]};} \"$DAEMON_EXEC\" ${DAEMON_ARGS[*]} \
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${DAEMON_EXTRA_ARGS[*]} $(printf -- "-e \"%s\" " "${SERVICE_ENVIRONMENT[@]}") -- \"$SERVICE_EXEC\" ${SERVICE_ARGS[*]} ${SERVICE_EXTRA_ARGS[*]}"
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# shellcheck disable=SC2181
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if (( $? != 0 )); then
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error "error starting '${DAEMON_EXEC##*/}'"
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return 2
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else
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return 0
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fi
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}
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stopdaemon() {
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id "${SERVICE_RUNUSER:-$(whoami)}" >/dev/null 2>&1 || {
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error "invalid user: ${SERVICE_RUNUSER:-$(whoami)}"
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return 2
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}
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su - "${SERVICE_RUNUSER:-$(whoami)}" -c "\"$DAEMON_EXEC\" -n \"${0##*rc.}\" --stop 2>/dev/null"
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sleep "${SLAY_DELAY:-2}"
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checkstatus >/dev/null && {
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error "failed to stop gracefully - slaying"
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su - "${SERVICE_RUNUSER:-$(whoami)}" -c "\"$DAEMON_EXEC\" -n \"${0##*rc.}\" --signal=kill 2>/dev/null"
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}
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return 0
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}
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case "$1" in
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'start')
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if checkstatus >/dev/null; then
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error "${SERVICE_EXEC##*/}: already running"
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printf " %s\\n" "Try: ${BASH_SOURCE[0]} status" >&2
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RET=1
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else
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startdaemon
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RET=$?
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fi
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;;
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'stop')
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if ! checkstatus >/dev/null; then
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error "${SERVICE_EXEC##*/}: not running"
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printf " %s\\n" "Try: ${BASH_SOURCE[0]} status" >&2
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RET=1
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else
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stopdaemon
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RET=$?
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fi
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;;
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'restart')
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checkstatus >/dev/null
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(( $? != 3 )) && {
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stopdaemon >/dev/null 2>&1
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sleep "${RESTART_DELAY:-2}"
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}
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startdaemon
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RET=$?
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;;
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'status')
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checkstatus
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RET=$?
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;;
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*)
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printf "%s\\n" "Usage: ${BASH_SOURCE[0]} <start|stop|restart|status>" >&2
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RET=1
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;;
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esac
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return $RET 2>/dev/null || exit $RET
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