path: root/bin/restart-pid

#!/bin/bash -e
# do nasty work here
# The job of this script is twofold:
# 1. kill the existing server, if it exists
# 2. write the PID file and start the new server

source restart-config

PROCESS=$1

if test -f $PROCESS.pid
then
    # if the process ID may change its name (e.g. via exec),
    # then remove '$PROCESS' on the following line
    PID=$(pgrep $PROCESS -u $UID -F $PROCESS.pid || true)
    if test -n "$PID"
    then
        kill $PID
        echo waiting for $PID to die so I can restart $PROCESS
        while
            ! kill -s 0 $PID
        do
            echo -n .
            sleep 1
        done
        # This shouldn't be necessary, but somehow is
        sleep 2
        echo
    else
        echo $PROCESS.pid does not point to a valid process - nothing killed
    fi
else
    echo No PID file $PROCESS.pid found - nothing killed
fi

if test -z "$VERBOSE"
then
    exec >/dev/null 2>&1
fi

{
    # $$ is not reset in subshells
    exec sh -c 'echo $$ > '$PROCESS'.pid; exec ./'$PROCESS
} &