Hi all,
I am able to generate a rootfs image of type btrfs.
Btrfs supports subvolumes, for instance with name @.
Using subvolumes instead of partitions allow more efficient use of the
emmc compared to separate partitions. And it allows multiple versions of
the rootfs in the same pool.
Manually I can create a subvolume (on the host) by loop mounting the
btrfs image and taking the snapshot. Something like this:
mkdir tmp
sudo mount edison-image.btrfs tmp
sudo btrfs subvolume snapshot tmp tmp/@
and then remove all dir's in root except @.
mount and btrfs operations need root permissions AFAIK. Is there any way
to add these to the recipe?
There is 2nd thing I want to achieve:
Btrfs can send / receive these snapshots allowing over-the-air-updates.
For this I need to:
sudo btrfs subvolume snapshot -r tmp/@ tmp/@ota
sudo btrfs send tmp/@ota > edison-image.snapshot
And then later manually (with the device having mounted btrfs on /mnt):
cat edison-image.snapshot | ssh root@edison "btrfs receive /mnt"
ssh root@edison "btrfs property set -ts /mnt/@ota ro false"
How do I automated the first steps in yocto?
Ferry
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