Script to mount all partitions from an image file into a temporary directory

mount-image.sh

#!/bin/bash

set -Eeuf -o pipefail

if [ ! "$(whoami)" = root ]; then
  echo "Please run as root"
  exit 1
fi

TMP="$(mktemp -d)"
chmod 777 "$TMP"
echo "Mounting at: $TMP"

FDISK="$(fdisk -lu "$1")"

SECTORSIZE="$({ grep 'Sector size' | grep --only-matching '[[:digit:]]\+' | head -n 1; } <<<"$FDISK")"

PART=1
while read -r line; do
  mkdir -p "$TMP/$PART"
  START="$(awk '{print $2}' <<<"$line")"
  SIZE="$(awk '{print $4}' <<<"$line")"
  mount -o loop,offset="$(( "$SECTORSIZE" * "$START" )),sizelimit=$(( "$SECTORSIZE" * "$SIZE" ))" "$1" "$TMP/$PART"
  ((PART++))
done < <(awk '/^Device/ { flag=1; next } flag' <<<"$FDISK")