raspi-fixup.sh

#!/bin/bash
#title...........:raspi-fixup.sh
#description.....:mount raspbian image and fixup some files
#author..........:scott@bitwise.ninja
#date............:2015.07.20
#version.........:0.5    
#usage...........:sudo bash raspi-fixup.sh
#notes...........:none
#==============================================================================


## make sure we sudo
if [[ $EUID -ne 0 ]]; then
  echo "This script must be run as root" 1>&2
  exit 1
fi

## get raspbian image file name
pi_img=$(ls -t *.img | head -1 )
echo "Image found: " $pi_img
## get start sector
start_sector=$(fdisk -lu $pi_img | sed ':a;N;$!ba;s/\n/ /g'  | sed -E 's/.*img2[ \t]+([0-9]+).*/\1/')

## calculate offset
let offset="$start_sector * 512"

echo "start sector: " $start_sector
echo "offset: " $offset

## mount the image
mkdir -p mnt
mount $pi_img -o offset=$offset ./mnt

## fixup the storage
sed -r -i.bak 's/mmcblk0p?/sda/g' ./mnt/etc/fstab
## fixup preload
sed -r -i.bak 's/^/#/g' ./mnt/etc/ld.so.preload

## create udev rules
echo 'KERNEL=="sda", SYMLINK+="mmcblk0"\nKERNEL=="sda?", SYMLINK+="mmcblk0p%n",' > ./mnt/etc/udev/rules.d/90-qemu.rule

## fixup network interfaces
sed -r -i.bak 's/iface eth0 inet manual/iface eth0 inet dhcp/g' ./mnt/etc/network/interfaces

## fixup the config script
sed -r -i.bak 's/mmcblk0p?/sda/g' ./mnt/usr/bin/raspi-config

## cleanup
umount mnt
rmdir mnt

## expand image
qemu-img resize $pi_img +2G