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man: document that systemd-fstab-generator actually cares about roothash=/usrhash= on the kernel cmdline
It doesn't really care about the hash value passed (which is processed
by systemd-veritysetup-generator), but it does care about the fact that
it is set (and mounts the DM nodes /dev/mapper/usr + /dev/mapper/root in
that case).
(cherry picked from commit ba4b74cbc7
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initrd.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>roothash=</varname></term>
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<term><varname>usrhash=</varname></term>
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<listitem><para>These options are primarily read by
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<citerefentry><refentrytitle>systemd-veritysetup-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>. When
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set this indicates that the root file system (or <filename>/usr/</filename>) shall be mounted from
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Verity volumes with the specified hashes. If these kernel command line options are set the root (or
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<filename>/usr/</filename>) file system is thus mounted from a device mapper volume
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<filename>/dev/mapper/root</filename> (or <filename>/dev/mapper/usr</filename>).</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>systemd.volatile=</varname></term>
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