This is a base snap for snapd that is based on Ubuntu 20.04

To build this snap locally you need snapcraft. The project must be built as real root.

$ sudo snapcraft

The usual way to add functionality is to write a shell script hook with the .chroot extenstion under the hooks/ directory. These hooks are run inside the base image filesystem.

Each hook should have a matching .test file in the hook-tests directory. Those tests files are run relative to the base image filesystem and should validates that the coresponding .chroot file worked as expected.

The .test scripts will be run after building with snapcraft or when doing a manual "make test" in the source tree.

It is possible to enable bootcharts by adding core.bootchart to the kernel command line. The sample collector will run until the system is seeded (it will stop when the snapd.seeded.service stops). The bootchart will be saved in the ubuntu-save partition, under log/boot<N>/, being <N> the boot number since bootcharts were enabled. If a chart has been collected by the initramfs, it will be also saved in that folder.

TODO In the future, we would want systemd-bootchart to be started only from the initramfs and have just one bootchart per boot. However, this is currently not possible as systemd-bootchart needs some changes so it can survive the switch root between initramfs and data partition. With those changes, we could also have systemd-bootchart as init process so we get an even more accurate picture.