Copy files from "src" folder into a memory partition

pj_start.sh

#!/usr/bin/env bash
SRC_PATH="src"
BKP_PATH="$SRC_PATH-ondisk"
INIT_SCRIPT=""
EXIT_SCRIPT=""

case "$1" in
  up|"")
    if [ -d "$BKP_PATH" ]; then
      echo "ERROR: Folder $BKP_PATH is present, please fix manually and try again then."
      exit 3
    fi
    if [ -d "$SRC_PATH" ]; then
      echo "Creating RAM partition at $SRC_PATH ..."
      # Copy files to RAM
      mv "$SRC_PATH" "$BKP_PATH"
      mkdir "$SRC_PATH"
      sudo mount -t tmpfs tmpfs "$SRC_PATH" -o size=1024m
      cp -a "$BKP_PATH"/* "$SRC_PATH"/
      cp -a "$BKP_PATH"/.[a-zA-Z]* "$SRC_PATH"/

      # Start VM/container
      if [ "$(ls -A $SRC_PATH)" ]; then
        eval $INIT_SCRIPT
      else
        echo "ERROR: Something went wrong while creating the RAM partition."
        exit 3
      fi
    else
      ls "$SRC_PATH"
      exit 3
    fi
    ;;
  down)
    echo "Destroying RAM partition at $SRC_PATH ..."
    eval $EXIT_SCRIPT
    sudo umount "$SRC_PATH"
    if [ "$(ls -A $SRC_PATH)" ]; then
      echo "ERROR: Can't umount '$SRC_PATH' do it manually!"
      exit 3
    else
      rm -r "$SRC_PATH"
      mv "$BKP_PATH" "$SRC_PATH"
    fi
    ;;
  *)
    echo "Usage: pj_start.sh up|down" >&2
    exit 3
    ;;
esac