On 11/22/16 1:05 AM, Kristian Amlie wrote: > Hey > > In Mender we are using a dual rootfs partition layout (A/B layout) with a > persistent data partition on the side. We're using wic to do the actual image > building. > > However, putting files into this data partition is not a straightforward > operation ATM. All recipes in OE put files into the rootfs only, and we'd > like there to be a way to specify that files should go into the data > partition. > > I haven't seen any straightforward way to do this in OE. Some suggestions for > how it could be done: > > * A "DATA_FILES" variable (like "IMAGE_BOOT_FILES"), where you can list files > you'd like to be included. This is very straightforward, but has the > disadvantage of being a bit hairy when paths are involved, and it doesn't > allow for much logic. > > * Keep a special "data" directory, something similar to sysroot, where > recipes could install files into in order to have it included on the data > partition. We could potentially have a bbclass for use in recipes to make > this more streamlined. >
Firstly, it needs to be defined what the data partition is about. 1. is it some pre-initialized/seeded data that can then be modified during subsequent boots ? 2. Is it read-only data which is then used to populate r/w data segments in RAM during boot 3. is it data that does not change over the course of install and reboots of the device > * Have a special recipe that users can bbappend, which specifically install > to the data partition (this might also need a "data" directory, like above). > > It's also possible that this should be generalized further so that it doesn't > only apply to a data partition, but to any non-rootfs partition. > > I'm willing to invest some time in this, but I thought I'd gather some > opinions first. > > Thoughts? >
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