Re: Install script supporting sysV init?

[Danny Milosavljevic <dannym@scratchpost.org>]

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> (1) Try to start it twice.  The second start attempt should fail and $? should reflect that

Nope, according to https://refspecs.linuxfoundation.org/LSB_2.1.0/LSB-Core-generic/LSB-Core-generic/iniscrptact.html the second attempt should do nothing and indicate success.

Attached a new version (moved pid file from /var/lock to /var/run ).

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#!/bin/bash
### BEGIN INIT INFO
# Provides:          guix-daemon
# Required-Start:    $remote_fs $syslog
# Required-Stop:     $remote_fs $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Guix build daemon
# Description:       Provides a daemon that does builds for Guix
### END INIT INFO

set -e
set -o pipefail
mkdir -p "/var/run"

case "$1" in
start)
  if [ -f "/var/run/guix-daemon.pid" ]
  then
    pid="`cat /var/run/guix-daemon.pid`"
    if ps www "${pid}" |grep -qa guix-daemon
    then
      exit 0
    else
      exit 1
    fi
  else
    daemonize \
      -a \
      -e /var/log/guix-daemon-stderr.log \
      -o /var/log/guix-daemon-stdout.log \
      -E GUIX_LOCPATH=/var/guix/profiles/per-user/root/guix-profile/lib/locale \
      -E LC_ALL=en_US.utf8 \
      -p /var/run/guix-daemon.pid \
      /var/guix/profiles/per-user/root/current-guix/bin/guix-daemon \
      --build-users-group=guixbuild
  fi
  ;;
stop)
  if [ -f "/var/run/guix-daemon.pid" ]
  then
    pid="`cat /var/run/guix-daemon.pid`"
    if ps www "${pid}" |grep -qa guix-daemon
    then
      kill "${pid}"
      sleep 10
      kill -9 "${pid}" || true
      exit 0
    fi
  else
    exit 0
  fi
  ;;
status)
  if [ -f "/var/run/guix-daemon.pid" ]
  then
    pid="`cat /var/run/guix-daemon.pid`"
    if ps www "${pid}" |grep -qa guix-daemon
    then
      echo "guix-daemon is running"
      exit 0
    else
      echo "guix-daemon has a stale pid file"
      exit 1
    fi
  else
    echo "guix-daemon is not running"
    exit 3
  fi
  ;;
restart)
force-reload)
  "$0" stop
  "$0" start
  ;;
*)
  echo "Usage: $0 (start|stop|status|restart|force-reload)"
  exit 3
  ;;
esac

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