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man: explicitly say the NSS is not OK in generators

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Inspired by: #44112

(cherry picked from commit 54b24a3855de37e5e19235c44acd113eb6ce6830)
This commit is contained in:
Lennart Poettering
2026-10-16 17:24:51 +01:00
committed by Luca Boccassi
parent d5999b66a2
commit b17f8cd9cc
1 changed files with 4 additions and 2 deletions
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man/systemd.generator.xml
+4 -2
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@@ -259,8 +259,10 @@
<listitem>
<para>Generators are run very early at boot and cannot rely on any external services. They may not
talk to any other process. That includes simple things such as logging to <citerefentry
project='man-pages'><refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum></citerefentry>, or
<command>systemd</command> itself (this means: no
project='man-pages'><refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry
project='man-pages'><refentrytitle>nss</refentrytitle><manvolnum>5</manvolnum></citerefentry> calls
such as <function>getpwnam()</function>, or IPC calls to <command>systemd</command> itself (this means: no
<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>)!
Non-essential file systems like <filename>/var/</filename> and <filename>/home/</filename> are
mounted after generators have run. Generators can however rely on the most basic kernel functionality