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man: clarify that generators are run before /var

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Just a clarification. At least systemd-openqa-generator from
openqa gets this wrong.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2016-02-06 17:53:31 -05:00
parent 89a1675845
commit 89fc708c0a
1 changed files with 9 additions and 6 deletions
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15
man/systemd.generator.xml
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@ -164,13 +164,16 @@
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>,
<citerefentry project='man-pages'><refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
or <command>systemd</command> itself (this means: no
<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>!). They
can however rely on the most basic kernel functionality to
be available, including a mounted <filename>/sys</filename>,
<filename>/proc</filename>, <filename>/dev</filename>.
<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 to be
available, including a mounted <filename>/sys</filename>,
<filename>/proc</filename>, <filename>/dev</filename>,
<filename>/usr</filename>.
</para>
</listitem>