#!/bin/bash
#==============================================================================
# Copyright and license info is available in the LICENSE file included with
# the Server Deployment Package (SDP), and also available online:
# https://swarm.workshop.perforce.com/projects/perforce-software-sdp/view/main/LICENSE
#------------------------------------------------------------------------------

# P4Web base init script

# Do nothing unless $SDP_INSTANCE is defined.
export SDP_INSTANCE="${1:-Unset}"

export OS_INIT_MECHANISM="${OS_INIT_MECHANISM:-Unset}"
declare -i StartDelay="${SDP_START_DELAY:-2}"
declare -i UseSystemd=0
declare MustUseSystemdMsg=
# p4web must run as root if the listen port is 1024 or less, e.g. to run on port 80.
declare -i RunAsRoot=0
declare Log=

if [[ $SDP_INSTANCE == Unset ]]; then
   echo -e "\\nError: The SDP_INSTANCE is not defined.\\n"
   exit 1
fi

export P4WEBBIN="/p4/${SDP_INSTANCE:-1}/bin/p4web_${SDP_INSTANCE:-1}"
export P4WEBLOG="/p4/${SDP_INSTANCE:-1}/logs/p4web.log"
Log="/p4/${SDP_INSTANCE:-1}/logs/p4web.init.log"

# Load SDP controlled shell environment.
# shellcheck disable=SC1091
source /p4/common/bin/p4_vars "$SDP_INSTANCE" || {
   echo -e "\\nError: Failed to load SDP environment for instance $SDP_INSTANCE.\\n"
   exit 1
}

# Added support for optional P4WEB_USER setting.  If set, P4USER will be set
# to this user before starting the p4web service.  This is recommended, as it
# prevents p4web from possibly logging out the primary super user that
# operates checkpoints. If defined, the user should also be added to
# SDP_AUTOMATION_USERS defined in the Instance Vars file, i.e. the p4_N.vars
# file in /p4/common/config.  This change is done in a way to avoid disrupting
# existing installations. To use the feature, do something like this,
# replacing N with the SDP instance name:
#
# source /p4/common/bin/p4_vars N
# echo P4WEB_USER=p4web >> /p4/common/site/config/$P4HOME.local
[[ -n "${P4WEB_USER:-}" ]] && export P4USER="$P4WEB_USER"

export P4WEBPORT=${P4WEBPORT:-8080}
export P4WEBPORTNUM=${P4WEBPORT##*:}

if [[ "$P4WEBPORTNUM" =~ ^[0-9]+$ ]]; then
   if [[ "$P4WEBPORTNUM" -le 1024 ]]; then
      export P4WEBARGS="-B -p $P4PORT -w $P4WEBPORT -U $OSUSER -L $P4WEBLOG"
      RunAsRoot=1
   else
      export P4WEBARGS="-B -p $P4PORT -w $P4WEBPORT -L $P4WEBLOG"
   fi
else
   echo -e "\\nError: The P4WEBPORTNUM value [$P4WEBPORTNUM] derived from P4WEBPORT [$P4WEBPORT] must be purely numeric.\\n"
   exit 1
fi

# shellcheck disable=SC1091
source "$P4CBIN/ps_functions.sh" || {
   echo -e "\\nError: Failed to load SDP ps_functions.sh lib.\\n"
   exit 1
}

# Determine if systemd is configured for this instance.
if [[ -n "$(command -v systemctl)" ]]; then
   ServiceName="${P4WEBBIN##*/}"
   if [[ -n "$(systemctl is-enabled "$ServiceName" 2>/dev/null)" ]]; then
      UseSystemd=1
      MustUseSystemdMsg="\\nError: It appears an attempt was made to start or stop the $ServiceName\\nservice without using systemd. When a systemd unit file is configured, only the\\nsystemd init mechanism can be used to start and stop the service, so that\\nsystemd maintains a more reliable indication of the status of the service. Run\\nas root or as $OSUSER with sudo. For example:\\n\\n\\tsudo systemctl start $ServiceName\\n\\tsudo systemctl stop $ServiceName\\n\\tsystemctl status $ServiceName\\n\\nNote that the 'status' check does not require sudo.\\n\\nThe systemd unit file is:\\n\\n<<<<<<<<\\n$(sudo systemctl cat "$ServiceName")\\n>>>>>>>\\n\\nIf you used 'systemctl' and still got this message, then please check if OS_INIT_MECHANISM is defined\\nin the above file."
   fi
fi

if [[ $(id -u) -eq 0 ]]; then
   if [[ "$RunAsRoot" -eq 0 ]]; then
      exec su - "$OSUSER" -c "$0 $*"
   fi
elif [[ $(id -u -n) != "$OSUSER" ]]; then
   if [[ "$RunAsRoot" -eq 1 ]]; then
      echo -e "\\nError: Running as $(id -u -n), but $0 can only be run as root because the port number is $P4WEBPORTNUM (less than 1024 requires root).\\n"
      exit 1
   else
      echo -e "\\nError: Running as $(id -u -n), but $0 can only be run as root or $OSUSER.\\n"
      exit 1
   fi
else
   if [[ "$RunAsRoot" -eq 1 ]]; then
      echo -e "\\nError: Running as $(id -u -n), but $0 can only be run as root because the port number is $P4WEBPORTNUM (less than 1024 requires root).\\n"
      exit 1
   fi
fi

# See how we were called.
case "${2:-usage}" in
   start)
      if [[ "$UseSystemd" -eq 1 && "$OS_INIT_MECHANISM" != "systemd" ]]; then
         echo -e "$MustUseSystemdMsg"
         exit 1
      fi

      # Delay start $StartDelay seconds, for enhanced start reliability after reboot.
      sleep "$StartDelay"

      if [[ "$UseSystemd" -eq 1 ]]; then
         echo -e "$(date +'%Y-%m-%d-%H%M%S'): Starting $P4WEBBIN with:\\n\\t$P4WEBBIN $P4WEBARGS"
         # shellcheck disable=SC2086
         $P4WEBBIN $P4WEBARGS >> "$Log" 2>&1
      else
         echo -e "$(date +'%Y-%m-%d-%H%M%S'): Starting $P4WEBBIN with:\\n\\t$P4WEBBIN $P4WEBARGS &" >> "$Log" 2>&1
         # shellcheck disable=SC2086
         $P4WEBBIN $P4WEBARGS >> "$Log" 2>&1 &
      fi
   ;;
   status)
      p4web_pids=$(get_pids "$P4WEBBIN")
      if [[ -n "$p4web_pids" ]]; then
         echo "${P4WEBBIN} is running as pids: $p4web_pids."
         exit 0
      else
         echo "${P4WEBBIN} is NOT running."
         exit 1
      fi
   ;;

   stop)
      p4web_pids=$(get_pids "$P4WEBBIN")

      if [[ -n "$p4web_pids" ]]; then
         while [[ -n "$p4web_pids" ]]; do
            echo "Shutting down ${P4WEBBIN} pids: $p4web_pids."
            echo "Shutting down ${P4WEBBIN} pids: $p4web_pids." >> "$Log" 2>&1
            # shellcheck disable=SC2086
            kill $p4web_pids 2>&1 | $GREP -v -i "No such"
            sleep 1
            p4web_pids=$(get_pids "$P4WEBBIN")
         done
         echo "${P4WEBBIN} stopped."
         exit 0
      else
         echo "${P4WEBBIN} was NOT running."
         exit 1
      fi
   ;;
   restart)
      $0 "$SDP_INSTANCE" stop
      $0 "$SDP_INSTANCE" start
   ;;
   *)
      echo -e "\\nUsage: $0 SDP_INSTANCE {start|stop|status|restart}\\n"
      exit 1
   ;;
esac

exit 0