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units: rename/rework systemd-boot-system-token.service → systemd-boot-random-seed.service

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This renames systemd-boot-system-token.service to
systemd-boot-random-seed.service and conditions it less strictly.

Previously, the job of the service was to write a "system token" EFI
variable if it was missing. It called "bootctl --graceful random-seed"
for that. With this change we condition it more liberally: instead of
calling it only when the "system token" EFI variable isn't set, we call
it whenever a boot loader interface compatible boot loader is used. This
means, previously it was invoked on the first boot only: now it is
invoked at every boot.

This doesn#t change the command that is invoked. That's because
previously already the "bootctl --graceful random-seed" did two things:
set the system token if not set yet *and* refresh the random seed in the
ESP. Previousy we put the focus on the former, now we shift the focus to
the latter.

With this simple change we can replace the logic
f913c784ad added, but from a service that
can run much later and doesn't keep the ESP pinned.
This commit is contained in:
Lennart Poettering
2023-01-04 15:18:10 +01:00
parent 5019b0cb15
commit 921fc451cb
10 changed files with 120 additions and 93 deletions
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man/bootctl.xml
+2 -2
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@@ -208,7 +208,7 @@
OS and a new seed to store in the ESP from the combination of both. The random seed passed to the OS
is credited to the kernel's entropy pool by the system manager during early boot, and permits
userspace to boot up with an entropy pool fully initialized very early on. Also see
<citerefentry><refentrytitle>systemd-boot-system-token.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
<citerefentry><refentrytitle>systemd-boot-random-seed.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
<para>See <ulink url="https://systemd.io/RANDOM_SEEDS">Random Seeds</ulink> for further
information.</para></listitem>
@@ -531,7 +531,7 @@ Boot Loader Entries:
<citerefentry><refentrytitle>systemd-boot</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
<ulink url="https://uapi-group.org/specifications/specs/boot_loader_specification">Boot Loader Specification</ulink>,
<ulink url="https://systemd.io/BOOT_LOADER_INTERFACE">Boot Loader Interface</ulink>,
<citerefentry><refentrytitle>systemd-boot-system-token.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
<citerefentry><refentrytitle>systemd-boot-random-seed.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>