Add support for upstart init and an installation script

Author: supechicken

autostart/crew-sudo.conf

@@ -0,0 +1,15 @@
+# crew-sudo.conf: Upstart init configuration file for crew-sudo
+description    "The crew-sudo daemon"
+author         "The Chromebrew authors"
+
+# autostart crew-sudo on early boot
+start on started boot-services
+
+script
+  # We pass --foreground to keep crew-sudo in the foreground.  Upstart already provides
+  # the same features for us:
+  # - It dropped a controlling tty (std{in,err,out} are /dev/null).
+  # - It calls setsid() for every job.
+  # - It forked for us.
+  exec /usr/local/bin/crew-sudo --daemon --foreground
+end script

component/daemon.rb

@@ -8,7 +8,8 @@ def runas_daemon(argv)
   $mode = :daemon
 
   # daemonize
-  Process.daemon(false, true)
+  Process.daemon(false, true) unless ARGV.include?('--foreground')
+
   Process.setproctitle('sudo-server daemon process')
 
   warn "crew-sudo: Daemon started with PID #{Process.pid}"

crew-sudo

@@ -35,8 +35,6 @@ when 'crew-sudo'
       Run '#{PROGNAME} --help' for usage.
     EOT
   end
-when 'sudod'
-  runas_daemon(ARGV)
 when 'sudo'
   runas_client(ARGV)
 end

install.sh

@@ -0,0 +1,21 @@
+#!/bin/bash -eu
+
+if [ ${EUID} != 0 ] && [ ! -w ${INSTALL_PREFIX} ]; then
+  echo "Please run this script as root." 2>&1
+  exit 1
+fi
+
+INSTALL_PREFIX="${CREW_PREFIX:-/usr/local}"
+
+cp -r . ${INSTALL_PREFIX}/lib/crew-sudo
+
+ln -s ../lib/crew-sudo/crew-sudo ${INSTALL_PREFIX}/bin/crew-sudo
+ln -s ../lib/crew-sudo/crew-sudo ${INSTALL_PREFIX}/bin/sudo
+
+if [ -d ${INSTALL_PREFIX}/etc/env.d ]; then
+  # installing under chromebrew
+  ln -s ../lib/crew-sudo/autostart/crew-sudo.sh ${INSTALL_PREFIX}/etc/env.d/crew_sudo
+else
+  # installing without chromebrew, append the autostart script to bashrc
+  echo "source ${INSTALL_PREFIX}/lib/crew-sudo/autostart/crew-sudo.sh" > ~/.bashrc
+fi