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man: document that with RuntimeDirecoryPreserve= dirs are under /run/private/

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This is not immediately obvious so document it explicitly.

Follow-up for 40cd2ecc26
This commit is contained in:
Luca Boccassi
2026-03-16 18:45:58 +00:00
committed by Zbigniew Jędrzejewski-Szmek
parent 3c0c557f6c
commit c751714d8c
1 changed files with 9 additions and 0 deletions
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9
man/systemd.exec.xml
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@@ -1773,6 +1773,15 @@ StateDirectory=aaa/bbb ccc</programlisting>
<literal>tmpfs</literal>, then for system services the directories specified in
<varname>RuntimeDirectory=</varname> are removed when the system is rebooted.</para>
<para>If <varname>DynamicUser=</varname> is used together with
<varname>RuntimeDirectoryPreserve=</varname> set to values other than <option>no</option>, the logic
is slightly altered: the <varname>RuntimeDirectory=</varname> directories are created below
<filename>/run/private/</filename>, which is a host directory made inaccessible to unprivileged
users, which ensures that access to these directories cannot be gained through dynamic user ID
recycling. Symbolic links are created to hide this difference in behaviour. Both from the
perspective of the host and from inside the unit, the relevant directories hence always appear
directly below <filename>/run/</filename>.</para>
<xi:include href="version-info.xml" xpointer="v235"/></listitem>
</varlistentry>