p4broker_base #1

#!/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
#------------------------------------------------------------------------------

# Helix Broker 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 ExitCode=0
declare -i UseSystemd=0
declare ServiceName=
declare P4BrokerFlags=

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

# Load SDP controlled shell environment.
# shellcheck disable=SC1091
source /p4/common/bin/p4_vars "$SDP_INSTANCE"
ExitCode="$?"

if [[ "$ExitCode" -ne 0 ]]; then
   echo -e "\\nError: Failed to load SDP environment for instance $SDP_INSTANCE.\n"
   exit 1
fi

# shellcheck disable=SC1090
source "$P4CBIN/ps_functions.sh"
ExitCode="$?"

if [[ "$ExitCode" -ne 0 ]]; then
   echo -e "\\nError: Failed to load SDP ps_functions.sh lib.\n"
   exit 1
fi

if [[ $(id -u) -eq 0 ]]; then
   exec su - "$OSUSER" -c "$0 $*"
elif [[ $(id -u -n) != "$OSUSER" ]]; then
   echo "$0 can only be run by root or $OSUSER"
   exit 1
fi

if [[ ! -x "$P4BROKERBIN" ]]; then
   echo -e "\\nError: $P4BROKERBIN is not executable."
   exit 2;
fi

declare OpMode=${2:-usage}
declare ConfigTag=${3:-default}
declare ConfigTagList=
declare -i ExitStatus=0

if [[ "$ConfigTag" == "all" ]]; then
   # shellcheck disable=SC2164 disable=SC2012
   ConfigTagList="default $(cd "${P4CCFG}"; ls "${P4SERVER}".broker.*.cfg 2>/dev/null | cut -d '.' -f 3)"
   # shellcheck disable=SC2116
   ConfigTagList=$(echo "$ConfigTagList")
else
   ConfigTagList=$ConfigTag
fi

for tag in $ConfigTagList; do
   if [[ "$tag" == "default" ]]; then
      ServiceName="${P4BROKERBIN##*/}"
      if [[ -r "/p4/common/config/${P4SERVER}.broker.${HOSTNAME%%.*}.cfg" ]]; then
         export P4BROKERCFG="${P4CCFG}/${P4SERVER}.broker.${HOSTNAME%%.*}.cfg"
      else
         export P4BROKERCFG="${P4CCFG}/${P4SERVER}.broker.cfg"
      fi
   else
      ServiceName="${P4BROKERBIN##*/}_${tag}"
      export P4BROKERCFG="${P4CCFG}/${P4SERVER}.broker.${tag}.cfg"
   fi

   # Determine if systemd is configured for this instance and config.
   if [[ -n "$(command -v systemctl)" ]]; then
      if systemctl cat "$ServiceName" > /dev/null 2>&1; 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 $ServiceName\\n\\nNote that the 'status' check does not require sudo.\\n\\nThe systemd unit file is:\\n\\n$(systemctl cat "$ServiceName")"
      else
         UseSystemd=0
      fi
   fi

   if [[ ! -r "$P4BROKERCFG" ]]; then
      echo -e "\\nError: Missing broker config file $P4BROKERCFG.\n"
      ExitStatus=1
      continue
   fi

   # Set flags to start the broker referencing the config file.
   P4BrokerFlags="-d -c $P4BROKERCFG"

   # If running with systemd, we drop the '-d' flag and let systemd handle the
   # process forking.
   if [[ "$UseSystemd" -eq 1 ]]; then
      P4BrokerFlags="${P4BrokerFlags/-d / }"
   fi

   case "$OpMode" in
      start)
         if [[ "$UseSystemd" -eq 1 && "$OS_INIT_MECHANISM" != "systemd" ]]; then
            echo -e "$MustUseSystemdMsg"
            exit 1
         fi

         # Delay start $StartDelay seconds.
         sleep "$StartDelay"

         echo "Starting ${P4BROKERBIN} ($tag config) using ${P4BROKERCFG}."
         # shellcheck disable=SC2086
         ${P4BROKERBIN} $P4BrokerFlags
      ;;

      status)
         p4broker_pids=$(get_pids "$P4BROKERCFG")
         if [[ -n "$p4broker_pids" ]]; then
            echo "${P4BROKERBIN} ($tag config) is running as pids: $p4broker_pids."
            ExitStatus=0
         else
            echo "${P4BROKERBIN} ($tag config) is NOT running."
            ExitStatus=1
         fi
      ;;

      stop)
         p4broker_pids=$(get_pids "$P4BROKERCFG")

         if [[ -n "$p4broker_pids" ]]; then
            if [[ "$UseSystemd" -eq 1 && "$OS_INIT_MECHANISM" != "systemd" ]]; then
               echo -e "$MustUseSystemdMsg"
               exit 1
            fi

            while [[ -n "$p4broker_pids" ]]; do
               echo "Shutting down ${P4BROKERBIN} ($tag config) pids $p4broker_pids."
               # shellcheck disable=SC2086
               kill $p4broker_pids 2>&1 | $GREP -v -i "No such"
               sleep 1
               p4broker_pids=$(get_pids "$P4BROKERCFG")
            done
            echo "${P4BROKERBIN} ($tag config) stopped."
            ExitStatus=0
         else
            echo "${P4BROKERBIN} ($tag config) was NOT running."
            ExitStatus=1
         fi
      ;;
      restart)
         $0 "$SDP_INSTANCE" stop "$tag"
         $0 "$SDP_INSTANCE" start "$tag"
      ;;
      *)
         echo -e "\nUsage: $0 SDP_INSTANCE {start|stop|status|restart} [<ConfigTag>|all]\n"
         ExitStatus=1
      ;;
   esac
done

exit $ExitStatus