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man: document that ConditionKernelCommandLine= looks at /proc/1/environ in containers 

Fixes: #16941
This commit is contained in:
Lennart Poettering 2020-10-16 18:22:37 +02:00 committed by Zbigniew Jędrzejewski-Szmek
parent f081b47f81
commit af4b8f8048
1 changed files with 4 additions and 1 deletions
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5
man/systemd.unit.xml
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@ -1207,7 +1207,10 @@
argument must either be a single word, or an assignment (i.e. two words, separated by
<literal>=</literal>). In the former case the kernel command line is searched for the word
appearing as is, or as left hand side of an assignment. In the latter case, the exact assignment is
looked for with right and left hand side matching.</para>
looked for with right and left hand side matching. This operates on the kernel command line
communicated to userspace via <filename>/proc/cmdline</filename>, except when the service manager
is invoked as payload of a container manager, in which case the command line of <filename>PID
1</filename> is used instead (i.e. <filename>/proc/1/cmdline</filename>).</para>
</listitem>
</varlistentry>