Updated basic_mount_image.sh

shell_utils/basic_mount_image.sh

@@ -1,9 +1,14 @@
 #!/bin/bash
 
+
+# Last update 16/05/2023 (dd/mm/yyyy)
+
 # This script will mount a given image in loop mode.
 # Make sure to change the path and offsets for the image you use. You can get
 # the correct offsets using `file $PATH_TO_IMAGE` or fdisk.
 
+
+
 # To make debugging easier
 echo "KittenGroomer: in mount_image.sh" 1>&2
 
@@ -13,34 +18,41 @@ if [ "$(id -u)" != "0" ]; then
 fi
 
 set -e
-set -x
+#set -x
 
 # Double check the path and offsets as noted above!
 # Path to the image
-IMAGE='2019-09-26-raspbian-buster-lite.img'
+IMAGE='' 
+
+
 # Start sector of boot (first) partition
-BOOT_START=`sfdisk -J ${IMAGE} | grep img1 | sed -n 's/.*"start":*\([[:digit:]]*\).*/\1/p'`
+BOOT_START=`sfdisk -J ${IMAGE} | grep -m 1 start | sed 's/"start":\|"\|,//g'`
 # Amount of sectors of boot (first) partition
-BOOT_SIZE=`sfdisk -J ${IMAGE} | grep img1 | sed -n 's/.*"size":*\([[:digit:]]*\).*/\1/p'`
+BOOT_SIZE=`sfdisk -J ${IMAGE} | grep -m 2 size | tail -n +2 | sed 's/"size":\|"\|,//g'`
 # Start sector of root (second) partition
-ROOT_START=`sfdisk -J ${IMAGE} | grep img2 | sed -n 's/.*"start":*\([[:digit:]]*\).*/\1/p'`
+ROOT_START=`sfdisk -J ${IMAGE} | grep -m 2 start | tail -n +2 | sed 's/"start":\|"\|,//g'`
 # Amount of sectors of root (second) partition
-ROOT_SIZE=`sfdisk -J ${IMAGE} | grep img2 | sed -n 's/.*"size":*\([[:digit:]]*\).*/\1/p'`
+ROOT_SIZE=`sfdisk -J ${IMAGE} | grep -m 3 size | tail -n +3 | sed 's/"size":\|"\|,//g'`
+
 
 # Locations you'd like the partitions mounted
 BOOT_PATH='/mnt/rpi-boot'
 ROOTFS_PATH='/mnt/rpi-root'
 
 # Calculate offsets for each partition
-offset_boot=$((${BOOT_START} * 512))
-sizelimit_boot=$((${BOOT_SIZE} * 512))
-offset_rootfs=$((${ROOT_START} * 512))
-sizelimit_rootfs=$((${ROOT_SIZE} * 512))
+offset_boot=$[BOOT_START * 512]
+sizelimit_boot=$[BOOT_SIZE * 512]
+offset_rootfs=$[ROOT_START * 512]
+sizelimit_rootfs=$[ROOT_SIZE * 512]
+
 # TODO: add logic for creating directories if they aren't already there
 mkdir -p ${BOOT_PATH}
 mkdir -p ${ROOTFS_PATH}
 # Mount each partition in loop mode
 mount -o loop,offset=${offset_boot},sizelimit=${sizelimit_boot} ${IMAGE} ${BOOT_PATH}
 mount -o loop,offset=${offset_rootfs},sizelimit=${sizelimit_rootfs} ${IMAGE} ${ROOTFS_PATH}
 
+
+
 echo "Image mounted" 1>&2
+