There is a feature freeze now, so this might have to wait for after that. Alex
On Mon, 4 Mar 2024 at 07:16, Johannes Schneider via lists.openembedded.org <[email protected]> wrote: > > systemd-sysext allows to overlay another image (or multiple) ontop of > a "base-image" = the current rootfs, via the use of overlayfs; to add > tools and features meant for development purposes. > > To quote the documentation on systemd-sysext: > " ...addition in order to make debugging/development easier). System > extension images should not be misunderstood as a generic software > packaging framework, ..." > > To build a lean image, that only holds packages that are not already > part of the base-image, a snapshot of the package-database is taken > after the installation of the base-rootfs is done, and picked up again > when collecting the rootfs of such a extension image. > > with all this in place an example usage could look like this: > some-core-image.bb > inherit core-image > IMAGE_GEN_PKGDBFS = "1" > > extending-image.bb > inherit image-sysext > IMAGE_FSTYPES = "squashfs" > IMAGE_BASE_PKGDB = "some-core-image" > # the above pointing at a package-db similar to: > # > build/deploy/images/$MACHINE/some-core-image-$MACHINE-20240210172305-pkgdb.rootfs.tar.gz > > then on the device, running some-core-image, with the extension image placed > at FN: > $> ln -s "$FN" /run/extensions/$(basename $FN).raw > $> systemd-sysext list > $> SYSTEMD_LOG_LEVEL=debug systemd-sysext merge > > As long as the VERSION_ID of the extension image matches the os-release > in the base image, the above commands return sucessfully; > for details on the compativility check see the docs for systemd-sysext. > > ========= > > changes with v2: > rebase from 'kirkstone' onto 'master' > > changes with v3; > incorporate review suggestions for simplification > add task dependency handling > add oe-selftest for the pkgdb handling > add variable documentation and > some more comments, and examples in the commit-msg > > changes with v4; > rebase onto 'master' => no functional changes > fixed patchtest findings > > >
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