revfat+4rpi.sh Files

          #!/usr/bin/env bash
          #
          # Script to take an SD card image created by Livemedia-Creator (such as for a
          # Raspberry Pi) with an ext4 boot partition and reformat it to vfat and
          # it will take a new bootlabel input and apply it to the fstab on the images rootfs.
          # To use this script, provide the image name as
          # the first argument and the new (UPPERCASE 11 char alpahnumeric ONLY) BOOTLABEL for second arg.
          # BOTH args $1 and $2 are mandatory in this configuration to ensure maximum likelyhood of sucessful booting 
          #
          # Use  Example:
          # #>chmod +x revfat+4rpi.sh
          # #>./revfat+4rpi.sh image-name.img RPIBOOTPART
          #
          #*note full verbosity enabled for testing, remove the extra "v/V's" when your happy.
          #
          # Requirements: basic linux tools 
          # bash,blkid,fdisk,kpartx,sed
          #
          # Version 1.1 2014-08-27
          # Authors:
          # Andrew Greene,        Seneca College 2013-04-05
          # Christopher Markieta, Seneca College 2014-08-27
          #
          # Version 1.2 revfat+4rpi.sh 2018-01-03 KFlynn
          
          set -ex
          
          MY_DIR=$(dirname $0)
          
          if [ $(id -u) -ne 0 ]; then
              echo "Root privileges are required for running $0."
              exit 1
          elif [ -z $1 ]; then
              echo "Usage: $0 [image] [BOOTLABEL]    *(Use a 4 char min or a 11 char max UPPERCASE alphaNum Only BOOTLABEL NAME, eg RPIBOOTLABEL or 20190106RPI)"
              exit 1
          elif [ -z $2 ]; then
              echo "Usage: $0 [image] [BOOTLABEL]    *(Use a 4 char min or a 11 char max UPPERCASE alphaNum Only BOOTLABEL NAME, eg RPIBOOTLABEL or 20190106RPI)"
              exit 1
          fi
          #todo: need a "min4 , max11" UPPERCASE char alphanum validity check here on the bootlabel before proceeding. 
          
          bootloopdev=$(kpartx -avs "$1" | awk 'NR==1 {print $3}')
          echo "$bootloopdev"
          
          mkdir  -v  "$MY_DIR"/temp/
          mkdir -pv "$MY_DIR"/tmp/boot/
          
          # mount boot partition
          mount -o rw /dev/mapper/$bootloopdev "$MY_DIR"/temp/
          
          cp -rv "$MY_DIR"/temp/* "$MY_DIR"/tmp/boot/
          
          umount -v "$MY_DIR"/temp/
          
          # format boot parttion to vfat
          mkfs -V -t vfat -n $2 /dev/mapper/$bootloopdev
          
          # update partition fs info
          echo "t
          1
          c
          w
          " | fdisk "$1"
          
          # re-mount boot partition
          mount -o rw /dev/mapper/$bootloopdev "$MY_DIR"/temp/
          
          # copy original boot data to new vfat partition
          cp -rv "$MY_DIR"/tmp/boot/* "$MY_DIR"/temp/
          
          umount "$MY_DIR"/temp/
          kpartx -dv "$1"
          
          rmdir -v "$MY_DIR"/temp/
          rm -rfv "$MY_DIR"/tmp/
          
          #do some work on rootfs
          #todo: identify/count nparts and select proper rootfs part automatically
          #using 2 parts for default for now 
          rootfsloopdev=$(kpartx -avs "$1" | awk 'NR==2 {print $3}')
          echo "$rootfsloopdev"
          
          mkdir -pv "$MY_DIR"/tmp/rootfs/
          
          # mount rootfs partition
          mount -o rw /dev/mapper/$rootfsloopdev "$MY_DIR"/tmp/rootfs/
          
          #remove any existing entries for boot from fstab
          sed -i '\/boot/d' "$MY_DIR"/tmp/rootfs/etc/fstab
          echo "removing old /boot entries if any from fstab"
          
          
          #write out a new id to fstab
          echo "LABEL="$2"          /boot		vfat	defaults,noatime	0 0">>"$MY_DIR"/tmp/rootfs/etc/fstab
          echo ...
          echo "Using "$2" as bootlabel name for image rootfs /etc/fstab"
          echo ...
          #write out whatever else changes needed for rootfs here as needed
          #
          sleep 3
          echo ...
          echo ...
          echo ...
          echo "printing final fstab contents before umount of rootfs:"
          cat "$MY_DIR"/tmp/rootfs/etc/fstab
          sleep 3
          echo ...
          echo ...
          echo ...
          
          umount -v "$MY_DIR"/tmp/rootfs
          sleep 1
          kpartx -dv "$1"
          
          rm -rfv "$MY_DIR"/tmp
          
          echo ...
          echo "Showing our resultant device mapper blkid output"
          echo ...
          kpartx -avs "$1"
          sleep 1
          blkid  /dev/mapper/loop0p1
          blkid  /dev/mapper/loop0p2
          echo ...
          echo "All done!"
          echo ...
          sleep 1
          kpartx -dv "$1"
          exit 0