importlib.resources became part of 3.7 only. Allow using distros with
3.6 and the importlib_resources backport.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

Add the test which provides sequence of actions:
  1. create the image from binman dts
  2. create public and private keys
  3. add public key into dtb with fdt_add_pubkey
  4. 1. sign FIT container with new sign option with extracting from
        image
     2. sign exact FIT container with replacing of it in image
  5. check with fit_check_sign

Signed-off-by: Ivan Mikhaylov <fr0st61te@gmail.com>
Renumber test file from 277 to 280;
   Move UpdateSignatures() to Entry base class;
   Don't allow missing mkimage as it doesn't make sense;
   Propagate --toolpath for CI;
   Call mark_build_done() to avoid regenerating FIT:
Signed-off-by: Simon Glass <sjg@chromium.org>

Introduce proof of concept for binman's new option which provides sign
and replace FIT containers in binary images.

Usage as example:

from:
mkimage -G privateky -r -o sha256,rsa4096 -F fit
binman replace -i flash.bin -f fit.fit fit

to:
binman sign -i flash.bin -k privatekey -a sha256,rsa4096 -f fit.fit fit

and to this one if it's need to be extracted, signed with key and put it
back in image:
binman sign -i flash.bin -k privatekey -a sha256,rsa4096 fit

Signed-off-by: Ivan Mikhaylov <fr0st61te@gmail.com>

Implement this feature since it is useful for updating FITs within an
image.

Signed-off-by: Simon Glass <sjg@chromium.org>

Add these flags for the 'replace' subcommand too, to aid debugging.

Signed-off-by: Simon Glass <sjg@chromium.org>

44 2023 -0700

Use this function so that the help can be found even when binman is
running from a package.

Signed-off-by: Simon Glass <sjg@chromium.org>

The patman directory has a number of modules which are used by other tools
in U-Boot. This makes it hard to package the tools using pypi since the
common files must be copied along with the tool that uses them.

To address this, move these files into a new u_boot_pylib library. This
can be packaged separately and listed as a dependency of each tool.

Signed-off-by: Simon Glass <sjg@chromium.org>

Add a command-line argument for setting the tooldir, so that the default
can be overridden. Add this directory to the toolpath automatically.
Create the directory if it does not already exist.

Put the default in the argument parser instead of the class, so that it
is more obvious.

Update a few tests that expect the utility name to be provided without
any path (e.g. 'futility'), so they can accept a path, e.g.
/path/to/futility

Update the documentation and add a few tests.

Improve the help for --toolpath while we are here.

Signed-off-by: Simon Glass <sjg@chromium.org>

Some blobs are actually not necessary for the board to work correctly. Add
a property to allow this to be indicated. Missing optional blobs do not
cause a build failure.

Signed-off-by: Simon Glass <sjg@chromium.org>

Support entries which can be optional depending on their contents. This
allows special entry types which appear in the image only when needed.

Signed-off-by: Simon Glass <sjg@chromium.org>