On Tue, Nov 22, 2016 at 12:54:52PM +0100, Kristian Amlie wrote: > On 22/11/16 12:10, Patrick Ohly wrote: > >> ... > > > > All of these introduce some special mechanism. Let me propose something > > that might integrate better with the existing tooling: > > > > The "rootfs" directory gets redefined as representing the entire virtual > > file system. When creating a disk image, it gets split up into different > > partitions based on the image configuration. > > > > For example, the /home or /data directories in the rootfs could hold the > > content that in some image configurations goes into separate partitions. > > > > The advantage of this approach is that the tooling for staging content > > for image creation does not need to be changed. The same staged content > > then can be used to create different images, potentially even using > > different partition layouts. > > That's a very good idea. I think it beats all of my suggestions! > > > To implement this approach with wic, wic needs to be taught how to > > exclude directories from the main rootfs. Ideally, the mkfs.* tools > > should also support that without having to make an intermediate copy of > > the files for a certain partition, but initially wic could create > > temporary directory trees. > > Yes, some work would be needed here, but ultimately it would be contained > within wic and related tools, which is a good thing. >
I support the idea. Let's discuss the details of implementation and create a bug in bugzilla to track the development This can be done by extending existing rootfs plugin. It should be able to do 2 things: - populate content of one rootfs directory to the partition. We can extend syntax of --rootfs-dir parameter to specify optional directory path to use - exclude rootfs directories when populating partitions. I'd propose to introduce --exclude-dirs wks parser option to handle this. Example of wks file with proposed new options: part / --source rootfs --rootfs-dir=core-image-minimal --ondisk sda --fstype=ext4 --label root --align 1024 --exclude-dirs data --exclude-dirs home part /data --source rootfs --rootfs-dir=core-image-minimal:/home --ondisk sda --fstype=ext4 --label data --align 1024 part /home --source rootfs --rootfs-dir=core-image-minimal:/data --ondisk sda --fstype=ext4 --label data --align 1024 Does this make sense? Any other ideas? -- Regards, Ed -- _______________________________________________ Openembedded-core mailing list Openembedded-core@lists.openembedded.org http://lists.openembedded.org/mailman/listinfo/openembedded-core