Lennart Poettering 1421e6c5f4
bootctl: add link-auto/LinkAuto and auto-link on completed system update ...
Add a "bootctl link-auto" verb and a matching io.systemd.BootControl.LinkAuto()
Varlink method that behave exactly like "bootctl link" / Link(), except that
the UKI and extra resources are discovered automatically instead of being
passed in. The following directories are searched, in decreasing priority:
/etc/systemd/uki/, /run/systemd/uki/, /var/lib/systemd/uki/ (where
systemd-sysupdate stages downloaded resources), /usr/local/lib/systemd/uki/
and /usr/lib/systemd/uki/.
- the UKI is taken from kernel.efi, or the best version in kernel.efi.v/
(resolved via vpick, without honouring boot-counting suffixes), from the
highest-priority directory that has one;
- extra resources are picked up from extras.d/, matching *.sysext.raw,
*.confext.raw and *.cred, each either as a plain file or as a versioned
*.v/ directory resolved via vpick, combined across all directories with
higher-priority directories winning on conflicts.
Everything is resolved relative to the pinned root directory fd. Files passed
via --extra= on the command line are linked in addition to the auto-discovered
ones.
Also bind io.systemd.SysUpdate.Notify.OnCompletedUpdate() in the boot control
Varlink server, which simply does the same as LinkAuto(), and hook a socket
into /run/systemd/sysupdate/notify/ via systemd-sysupdate-notify-bootctl.socket
(enabled by default via the preset) so a freshly downloaded kernel is linked
into $BOOT automatically after a sysupdate run.
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