List all the physical volumes detected. This is the equivalent
of the L<pvs(8)> command. The "full" version includes all fields.
+=head2 read-lines
+
+ read-lines path
+
+Return the contents of the file named C<path>.
+
+The file contents are returned as a list of lines. Trailing
+C<LF> and C<CRLF> character sequences are I<not> returned.
+
+Note that this function cannot correctly handle binary files
+(specifically, files containing C<\0> character which is treated
+as end of line). For those you need to use the C<read_file>
+function which has a more complex interface.
+
=head2 set-autosync | autosync
set-autosync true|false