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nixos/switch-to-configuration: reload user units

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When rebuilding you have to manually run `systemctl --user
daemon-reload`. It gathers all authenticated users using
`loginctl list-user` and runs `daemon-reload` for each of them.

This is a first step towards a `nixos-rebuild` which is able to reload
user units from systemd. The entire task is fairly hard, however I
consider this patch usable as it allows to restart units without running
`daemon-reload` for each authenticated user.
This commit is contained in:
Maximilian Bosch 2018-08-13 19:42:47 +02:00
parent 249ba3d3ed
commit fc2bde6d7a
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7
nixos/doc/manual/release-notes/rl-1809.xml
View file

@ -422,6 +422,13 @@ inherit (pkgs.nixos {
The module option <option>nix.useSandbox</option> is now defaulted to <literal>true</literal>.
</para>
</listitem>
<listitem>
<para>
The config activation script of <literal>nixos-rebuild</literal> now
<link xlink:href="https://www.freedesktop.org/software/systemd/man/systemctl.html#Manager%20Lifecycle%20Commands">reloads</link>
all user units for each authenticated user.
</para>
</listitem>
</itemizedlist>
</section>
</section>

12
nixos/modules/system/activation/switch-to-configuration.pl
View file

@ -412,6 +412,18 @@ system("@systemd@/bin/systemctl", "reset-failed");
# Make systemd reload its units.
system("@systemd@/bin/systemctl", "daemon-reload") == 0 or $res = 3;
# Reload user units
open my $listActiveUsers, '-|', '@systemd@/bin/loginctl', 'list-users', '--no-legend';
while (my $f = <$listActiveUsers>) {
next unless $f =~ /^\s*(?<uid>\d+)\s+(?<user>\S+)/;
my ($uid, $name) = ($+{uid}, $+{user});
print STDERR "reloading user units for $name...\n";
system("su", "-l", $name, "-c", "XDG_RUNTIME_DIR=/run/user/$uid @systemd@/bin/systemctl --user daemon-reload");
}
close $listActiveUsers;
# Set the new tmpfiles
print STDERR "setting up tmpfiles\n";
system("@systemd@/bin/systemd-tmpfiles", "--create", "--remove", "--exclude-prefix=/dev") == 0 or $res = 3;