repart: Add --generate-fstab= and --generate-crypttab= options

These can be used along with two new settings MountPoint= and
EncryptedVolume= to write fstab and crypttab entries to the given
paths respectively in the root directory that repart is operating on.

This is useful to cover scenarios that aren't covered by the
Discoverable Partitions Spec. For example when one wants to mount
/home as a separate btrfs subvolume. Because multiple btrfs subvolumes
can be mounted from the same partition, we allow specifying MountPoint=
multiple times to add multiple entries for the same partition.

man/repart.d.xml

@@ -734,6 +734,42 @@
 
         <xi:include href="version-info.xml" xpointer="v253"/></listitem>
       </varlistentry>
+
+      <varlistentry>
+        <term><varname>MountPoint=</varname></term>
+
+        <listitem><para>Specifies where and how the partition should be mounted. Takes at least one and at
+        most two fields separated with a colon (<literal>:</literal>). The first field specifies where the
+        partition should be mounted. The second field specifies extra mount options to append to the default
+        mount options. These fields correspond to the second and fourth column of the
+        <citerefentry project='man-pages'><refentrytitle>fstab</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+        format. This setting may be specified multiple times to mount the partition multiple times. This can
+        be used to add mounts for different btrfs subvolumes located on the same btrfs partition.</para>
+
+        <para>Note that this setting is only taken into account when <option>--generate-fstab=</option> is
+        specified on the <command>systemd-repart</command> command line.</para>
+
+        <xi:include href="version-info.xml" xpointer="v256"/></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><varname>EncryptedVolume=</varname></term>
+
+        <listitem><para>Specify how the encrypted partition should be set up. Takes at least one and at most
+        three fields separated with a colon (<literal>:</literal>). The first field specifies the encrypted
+        volume name under <filename>/dev/mapper/</filename>. If not specified, <literal>luks-UUID</literal>
+        will be used where <literal>UUID</literal> is the LUKS UUID. The second field specifies the keyfile
+        to use following the same format as specified in crypttab. The third field specifies a
+        comma-delimited list of crypttab options. These fields correspond to the first, third and fourth
+        column of the
+        <citerefentry><refentrytitle>crypttab</refentrytitle><manvolnum>5</manvolnum></citerefentry> format.
+        </para>
+
+        <para>Note that this setting is only taken into account when <option>--generate-crypttab=</option>
+        is specified on the <command>systemd-repart</command> command line.</para>
+
+        <xi:include href="version-info.xml" xpointer="v256"/></listitem>
+      </varlistentry>
     </variablelist>
   </refsect1>
 

man/systemd-repart.xml

@@ -588,6 +588,28 @@
         <xi:include href="version-info.xml" xpointer="v255"/></listitem>
       </varlistentry>
 
+      <varlistentry>
+        <term><option>--generate-fstab=</option><replaceable>PATH</replaceable></term>
+
+        <listitem><para>Specifies a path where to write fstab entries for the mountpoints configured with
+        <option>MountPoint=</option> in the root directory specified with <option>--copy-source=</option> or
+        <option>--root=</option> or in the host's root directory if neither is specified. Disabled by
+        default.</para>
+
+        <xi:include href="version-info.xml" xpointer="v256"/></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>--generate-crypttab=</option><replaceable>PATH</replaceable></term>
+
+        <listitem><para>Specifies a path where to write crypttab entries for the encrypted volumes configured
+        with <option>EncryptedVolume=</option> in the root directory specified with
+        <option>--copy-source=</option> or <option>--root=</option> or in the host's root directory if
+        neither is specified. Disabled by default.</para>
+
+        <xi:include href="version-info.xml" xpointer="v256"/></listitem>
+      </varlistentry>
+
       <xi:include href="standard-options.xml" xpointer="help" />
       <xi:include href="standard-options.xml" xpointer="version" />
       <xi:include href="standard-options.xml" xpointer="no-pager" />