RaspBerryPiのマルチブート設定作業

複数のOSの選択起動ができるberrybootを使う時、既存のOSを追加する
ノウハウをメモしておく。

imgファイルをSquashFs形式に変換して、Addボタン長押しで指定する。

# installs kpartx and squashfs-tools
sudo apt-get install kpartx squashfs-tools
#
# This opens your image file. 
#Change the DownloadedImage.img to what your image file name is.
sudo kpartx -av DownloadedImage.img
#
# After opening the image it will give you at least two /dev/mapper/loop#p#.  
# You want the bigger of the partitions (Normally p2).  
# In this case it was loop 1 is the image and I want partition 2 because it is the bigger of the two.
# sudo mount /dev/mapper/loop1p2 /mnt
# Change # to the loop number the previous command reported.
#
sudo mount /dev/mapper/loop#p2 /mnt
#
# This is what make the image writable on berryboot
# This line should work as is.  It edits the file fstab on the image folder etc
sudo sed -i 's/^\/dev\/mmcblk/#\0/g' /mnt/etc/fstab
#
# This line is what takes the mounted image and converts it the a squashfs image.
# Note if you do this from the raspberry pi it will take several hours (dependent on the original image size).
# Change NewBerryBoot.img to the desired image name.
sudo mksquashfs /mnt NewBerryBoot.img -comp lzo -e lib/modules
#
# This unmounts the image you mounted at the beginning.
# This line should work as is
sudo umount /mnt
#
# This closes the image we opened at the beginning.
# Change the DownloadedImage.img to what your image file name is.
sudo kpartx -d DownloadedImage.img 
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