mkimg.sh

This shell script creates a distributable image from a Raspberry Pi SD card.

NOTE: This script has not been used for imaging irreplaceable data. While this script should not be destructive, it modifies the filesystem and partition table.

It can be run like this:

bash mkimg.sh /dev/sda sdcard.img.zip

What does the script do

Under the hood the script performs the following operations:

• ensures the first partition is fat32 and the second partition ext4
• fixes any errors on the filesystem
• shrinks the Linux filesystem to its smallest size
• shrinks the Linux partition to the size of the filesystem + small buffer
• creates a compressed image from the given device
• expands the partition and filesystem back to their largest sizes

Flash SD card with the image

Linux

Replace <device> with the location of your SD card; e.g. /dev/sda:

unzip -p sdcard.img.zip | sudo dd bs=1M of=<device>

Mac

Replace <device> with the location of your SD card; e.g. /dev/rdisk1:

unzip -p sdcard.img.zip | sudo dd bs=1m of=<device>