#!/bin/sh

# A routine to change the user that runs Firebird SS.
# Under all circumstances postinstall.sh script tries to create
# user and group named firebird. We don't need to repeat this attempts here.
# If one changes runUser to something specific for him (some like user293),
# he must take care to add correct user before it!

RunUser=$1
RunGroup=$2
if [ "$3" ]
then
    Usage: SSchangeRunUser.sh [RunUser] [RunGroup]
    exit 100
fi

#------------------------------------------------------------------------
# Prompt for response, store result in Answer

Answer=""

AskQuestion() {
    Test=$1
    DefaultAns=$2
    echo -n "${1}"
    Answer=""
    read Answer
    if [ -z $Answer ]
    then
        Answer="$DefaultAns"
    fi
}



#------------------------------------------------------------------------
# Check for a previous install 


checkInstallUser() {

    if [ "`whoami`" != "root" ];
      then
        ehco ""
        echo "--- Warning ----------------------------------------------"
        echo ""
        echo "    You need to be 'root' user to do this change"
        echo ""
        exit
    fi
}


#------------------------------------------------------------------------
#  stop super server if it is running
#  Also will only stop firebird, since that has the init script


stopServerIfRunning() {

    checkString=`ps -efww| egrep "(fbserver|fbguard)" |grep -v grep`

    if [ ! -z "$checkString" ] 
      then
	$StartupScript stop
    fi
}

#------------------------------------------------------------------------
#  check if it is running


checkIfServerRunning() {

    stopServerIfRunning

# Check is server is being actively used.

    checkString=`ps -efww| egrep "(fbserver|fbguard)" |grep -v grep`

    if [ ! -z "$checkString" ] 
      then
        echo "An instance of the Firebird/InterBase Super server seems to be running." 
        echo "Please quit all interbase applications and then proceed"
        exit 1 
    fi

    checkString=`ps -efww| egrep "(fb_inet_server|gds_pipe)" |grep -v grep`

    if [ ! -z "$checkString" ] 
      then
        echo "An instance of the Firebird/InterBase Classic server seems to be running." 
        echo "Please quit all interbase applications and then proceed." 
        exit 1 
    fi



# Stop lock manager if it is the only thing running.

    for i in `ps -efww | grep "fb_lock_mgr" | grep -v "grep" | awk '{print $2}' `
     do
        kill $i
     done

}


#------------------------------------------------------------------------
#  changeInitRunUser


changeInitRunUser() {

    NewUser=$1

    chmod u=rwx,g=rx,o= $StartupScript
    ex $StartupScript <<EOF
/FBRunUser/s/FBRunUser=.*/FBRunUser=$NewUser/g
w
q
EOF
    chmod u=rwx,g=rx,o= $StartupScript
    
}


#------------------------------------------------------------------------
#  check for RunUsetr and RunGroup

checkIfUserIsPresent() {
    checkString=`grep $RunUser /etc/passwd`
    if [ -z "$checkString" ]
    then
	echo User $RunUser missing - script failed.
	exit 20
    fi
    checkString=`grep $RunGroup /etc/group`
    if [ -z "$checkString" ]
    then
	echo Group $RunGroup missing - script failed.
	exit 21
    fi
}


#------------------------------------------------------------------------
#  main code


checkInstallUser

IBRootDir=@prefix@
IBBin=$IBRootDir/bin

if [ -z "$RunUser" ]
then
    AskQuestion "Enter new RunUser for firebird super server [firebird]: " firebird
    RunUser="$Answer"
fi
if [ -z "$RunGroup" ]
then
    AskQuestion "Enter new RunGroup for firebird super server [firebird]: " firebird
    RunGroup="$Answer"
fi

checkIfUserIsPresent
    
echo ""
echo "Change Firebird install for $IBRootDir to uid=$RunUser gid=$RunGroup"
echo ""
AskQuestion "Press return to continue - or ^C to abort"

# Locating startup script
StartupScript=""
if [ -f /etc/rc.d/init.d/firebird ]
  then
    StartupScript=/etc/rc.d/init.d/firebird
elif [ -f /etc/init.d/firebird ]
  then
    StartupScript=/etc/init.d/firebird
fi
if [ -z $StartupScript ]
then
    echo "Failed to locate startup script for firebird."
    exit 10
fi

# Stop server if running
checkIfServerRunning

# Update ownership and SUID bits for programs.
echo "Updating $IBRootDir"
chown $RunUser.$RunGroup $IBRootDir/isc_* $IBRootDir/firebird.log $IBRootDir/security.fdb

# Update startup script
echo "Updating startup script"
changeInitRunUser $RunUser

# start the db server
if $StartupScript start
then
    echo ""
    echo "Completed."
else
    echo ""
    echo "Firebird startup failed."
    exit 11
fi
exit 0