Thanks Mirzak for your help !
This is correct, the rootfs images is streamed from the net to the inactive partition and will continue the download if e.g interrupted by a network loss.
Ok because when I check the Root Filesystem Image v2 (which is not the official one ofc) I can not see how it is possible to write at the next position in the partition with a simple cat. So I was wondering…
Could you maybe specific a bit more details about your use-case? What is meant by “extra files and operations”?
Let’s say I want to upload a root fs partition with the A/B mechanic (i.e. a dual rootfs artifact) with the kernel inside, but I also want to upload an extra data partition at the same time (in the same artifact). The two partitions are “linked” but still dissociated on disk. That is why I was talking about extending the dual rootfs update module behavior.