doc/develop/py_testing.rst: Update section on filesystem images

Now that we have no users of "virt-make-fs" nor users of "sudo" for
creating disk images update the documentation. We remove packages that
are no longer required (and related text) as well as be firm in our
wording around not using "sudo".

Signed-off-by: Tom Rini <trini@konsulko.com>

diff --git a/doc/develop/py_testing.rst b/doc/develop/py_testing.rst
index 40a8538..502053f 100644 (file)
--- a/doc/develop/py_testing.rst
+++ b/doc/develop/py_testing.rst
@@ -41,13 +41,11 @@ will be required. The following is an incomplete list:
 * dfu-util
 * dtc
 * openssl
-* sudo OR guestmount
 * e2fsprogs
 * util-linux
 * coreutils
 * dosfstools
 * efitools
-* guestfs-tools
 * mount
 * mtools
 * sbsigntool
@@ -64,23 +62,12 @@ The test script supports either:
   physical board, attach to the board's console stream, and reset the board.
   Further details are described later.
 
-The usage of command 'sudo' should be avoided in tests. To create disk images
-use command virt-make-fs which is provided by package guestfs-tools. This
-command creates a virtual machine with QEMU in which the disk image is
-generated.
-
-Command virt-make-fs needs read access to the current kernel. On Ubuntu only
-root has this privilege. You can add a script /etc/initramfs-tools/hooks/vmlinuz
-with the following content to overcome the problem:
-
-.. code-block:: bash
-
-    #!/bin/sh
-    echo "chmod a+r vmlinuz-*"
-    chmod a+r /boot/vmlinuz-*
-
-The script should be chmod 755. It will be invoked whenever the initial RAM file
-system is updated.
+The usage of the command 'sudo' is not allowed in tests. Using elevated
+priviledges can lead to security concerns. Furthermore not all users may have
+administrator rights. Therefore the command 'sudo' must not be used in tests.
+To create disk images we have helper functions located in
+`test/py/tests/fs_helper.py` which shall be used in any tests that require
+creating disk images.
 
 Using `virtualenv` to provide requirements
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~