mnt-image

#!/bin/bash

set -e

if [[ "$OSTYPE" != linux* ]]; then
  echo "Not on a Linux box; aborting."
  exit 1
fi

if [[ `id -u` != 0 ]]; then
  echo "Not root; aborting."
  exit 1
fi

if [[ $# != 1 && $# != 2 ]]; then
  echo "Usage: $0 <floppy image> [ <mount point> ]"
  exit 1
fi

MNTROOT=/mnt/initrd
mkdir -p $MNTROOT
if ! [ -d $MNTROOT ]; then
  echo "Couldn't mkdir -p $MNTROOT" >&2
  exit 1
fi

img=$1
imgbase=${1##*/}
mnt=${2:-$MNTROOT/$imgbase}
absmnt="`abs $mnt`"
if mount | egrep -q "$absmnt"; then
  echo "Something already mounted on $absmnt!  Aborting."
  exit 1
fi

[[ -d $mnt ]] || mkdir -p $mnt
fs="`file $img`"
case "$fs" in
  *FAT*)
    fstype=msdos ;;
  *ext2*)
    fstype=ext2  ;;
  *)
    echo -e "Image $img had unknown filesystem!\n$fs"
    exit 1 ;;
esac

echo "$img image type: $fstype"

if mount -o loop -t $fstype $img $mnt; then
  echo Mounted $img on $mnt
else
  echo -n "Retrying read-only ... "
  if ! mount -o loop,ro -t $fstype $img $mnt; then
    echo failed.
  else
    echo ok.
  fi
fi