On 15/04/2024 08:02:00+0200, Johannes Schneider via lists.openembedded.org 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 > > changes with v5: > rebase onto 'master' > add '.sysext' to the deployed symlink name > sidenote on the tests and autobuilder failure: run locally they > succeed, e.g.: > #> oe-selftest --verbose -r > imagefeatures.ImageFeatures.test_image_gen_pkgdbfs > > changes with v6: > restructure test to call 'bitbake' only once in the testcase itself > (in hopes of solving the autobuilder problem; local test runs succeed)
This still fails on the autobuilders: https://autobuilder.yoctoproject.org/typhoon/#/builders/80/builds/6607/steps/14/logs/stdio Reached login banner in 3.26 seconds (04/18/24 18:54:41) Couldn't login into serial console as root using blank password The output: root Password: Login timed out after 60 seconds. Poky (Yocto Project Reference Distro) 5.0+snapshot-0ee872ff1baf43e5436ccbd4c9ae4d733289e05e qemux86-64 /dev/ttyS1 qemux86-64 login: <<< run_serial(): command timed out after 120 seconds without output >>> 2024-04-18 19:17:59,061 - oe-selftest - INFO - 6: 20/46 379/588 (131.80s) (0 failed) (imagefeatures.ImageFeatures.test_image_gen_pkgdbfs) 2024-04-18 19:17:59,062 - oe-selftest - INFO - testtools.testresult.real._StringException: Traceback (most recent call last): File "/home/pokybuild/yocto-worker/oe-selftest-debian/build/meta/lib/oeqa/selftest/cases/imagefeatures.py", line 342, in test_image_gen_pkgdbfs self.assertTrue(os.path.exists(os.path.join(img_vars['DEPLOY_DIR_IMAGE'], 'var/lib/opkg/status')), 'opkg\'s status file was not present in: %s' % tar_file) File "/usr/lib/python3.9/unittest/case.py", line 682, in assertTrue raise self.failureException(msg) AssertionError: False is not true : opkg's status file was not present in: /home/pokybuild/yocto-worker/oe-selftest-debian/build/build-st-3638382/tmp/deploy/images/qemux86-64/core-image-minimal-qemux86-64.rootfs-pkgdb.tar.gz > > > -- Alexandre Belloni, co-owner and COO, Bootlin Embedded Linux and Kernel engineering https://bootlin.com
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