virt-resize: Mention alternate tools like gparted in the documentation.

diff --git a/tools/virt-resize b/tools/virt-resize
index ec1b534..5ced4dd 100755 (executable)
--- a/tools/virt-resize
+++ b/tools/virt-resize
@@ -1219,6 +1219,22 @@ Windows may initiate a lengthy "chkdsk" on first boot after a resize,
 if NTFS partitions have been expanded.  This is just a safety check
 and (unless it find errors) is nothing to worry about.
 
+=head1 ALTERNATIVE TOOLS
+
+There are several proprietary tools for resizing partitions.  We
+won't mention any here.
+
+L<parted(8)> and its graphical shell gparted can do some types of
+resizing operations on disk images.  They can resize and move
+partitions, but I don't think they can do anything with the contents,
+and they certainly don't understand LVM.
+
+L<guestfish(1)> can do everything that virt-resize can do and a lot
+more, but at a much lower level.  You will probably end up
+hand-calculating sector offsets, which is something that virt-resize
+was designed to avoid.  If you want to see the guestfish-equivalent
+commands that virt-resize runs, use the C<--debug> flag.
+
 =head1 SEE ALSO
 
 L<virt-list-partitions(1)>,
@@ -1232,6 +1248,7 @@ L<lvresize(8)>,
 L<resize2fs(8)>,
 L<ntfsresize(8)>,
 L<virsh(1)>,
+L<parted(8)>,
 L<Sys::Guestfs(3)>,
 L<http://libguestfs.org/>.