tcplay.sh

#!/usr/bin/env bash

######################### Make the Virtual Volume available #########################
make_available(){
   if [[ $# -lt 1 ]]; then
      return 1
   fi

   if [[ ! -e "$1" || ! -r "$1" || ! -f "$1" ]]; then
      return 2
   fi

   echo "Issuing losetup command:"
   if ! sudo losetup /dev/loop0 "$1"; then
      return 3
   fi
   cmd_status=1
   echo "losetup done!"

   echo "Issuing tcplay command:"
   if ! sudo tcplay -m "$1" -d /dev/loop0; then
      return 4
   fi
   cmd_status=2
   echo "tcplay done!"

   echo "Issuing mount command:"
   if ! sudo mount /dev/mapper/"$1" /media/ISOimgs; then
       return 5;
   fi
   cmd_status=3
   echo "mount done!"
   return 0
}

######################### Make the Virtual Volume unavailable #########################
make_unavailable(){
    case $cmd_status in
        3)
            echo "Undoing mount command!"
            if ! sudo umount /media/ISOimgs; then
                echo "Error undoing mount command!" 1>&2
                return $cmd_status
            fi
            ;&
        2)
            echo "Undoing tcplay command with dmsetup!"
            if ! sudo dmsetup remove "$1"; then
                echo "Error undoing tcplay with dmsetup!" 1>&2
                return $cmd_status
            fi
            ;&
        1)
            echo "Undoing losetup command!"
            if ! sudo losetup -d /dev/loop0; then
                echo "Error undoing losetup command!" 1>&2
                return $cmd_status
            fi
            ;;
        0)
            echo "No commans done so no commands undone!" 1>&2
            return $cmd_status
            ;;
        *)  echo "No commands undone or unknown error!" 1>&2
            exit 1
            ;;
    esac
   echo "Undone!"
}

show_params(){
    echo "Number of parameters is $#."
    echo "List of parameters is $*."
}

#########################           Main Script               #########################
cmd_status=0

###### Error hanling ######
err_no_err=0
err_status=0
err_param=1
err_no_file=2
err_losetup=3
err_tcplay=4
err_mount=5
err_umount=6
err_dmsetup=7
err_r_losetup=8

#if [[ $# -lt 1 ]]; then
#    echo "Usage: $0 /path/to/container.tc"
#    exit 1
#fi

while true; do
    echo "Enter an option:"
    echo "[A] or [a] to make Available"
    echo "[U] or [u] to make Unavailable"
    echo "[Q] or [q] to quit"
    while true; do
        read -r -n1 -p "> " opt
        echo
        case $opt in
            "a"|"A")
               make_available "$@" cm_status
               case "$?" in
                   1)
                       echo "Not enough parameters. Usage: $0 /path/to/container.tc"
                       ;;
                   2)
                       echo "$1 oesn't exist or not ready!"
                       ;;
                   3)
                       echo "Error with $1! Please fix manually!"
                       ;;
                   4)
                       echo "Error with $1! Please fix manually!"
                       ;;
                   5)
                       echo "Error with $1! Please fix manually!"
                       ;;
                   0)
                       echo
                       ;;
                   *)
                       echo "Unknown error! Exiting..."
                       exit 1
                       ;;
               esac
            "u"|"U")
               make_unavailable "$@" cmd_status
                ;;
            "q"|"Q")
               exit 1
               ;;
            *)
               echo "Unknown error!" 1>&2
               ;;
        esac
    done
done