Add Python requirements from framework/util

Any `all.sh` component that runs a script that requires a more recent
version of Python must have a `support_xxx` function that checks for the
requisite Python version or package. At this time, there is no such
requirement yet in the mbedtls repository.

The directory `framework/util` is not yet checked by `pylint` or `mypy`,
because we use older versions of these tools that don't work well with
modern Python versions.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>

Author: gilles-peskine-arm

scripts/ci.requirements.txt

@@ -26,3 +26,9 @@ cryptography >= 35.0.0; platform_system == 'Linux'
 # For building `framework/data_files/server9-bad-saltlen.crt` and check python
 # files.
 asn1crypto; platform_system == 'Linux'
+
+# More requirements for scripts in the framework that might not work in
+# older versions of Python. Note that requirements that are not available
+# in the oldest version of Python on our CI must be annodated with
+# "python >= ...".
+-r ../framework/util/requirements.txt

tests/scripts/components-basic-checks.sh

@@ -16,6 +16,16 @@ component_check_recursion () {
     ./framework/scripts/recursion.pl ${BUILTIN_SRC_PATH}/*.c
 }
 
+support_check_generated_files () {
+    # Add requirements on the Python installation here for
+    # the sake of check_committed_generated_files.py in mbedtls.
+    #
+    # Check the Python version, not the presence of the package,
+    # because the CI runs `all.sh --list-components` outside of the
+    # venv that has our desired packages.
+    :
+}
+
 component_check_generated_files () {
     msg "Check make_generated_files.py consistency"
     $MAKE_COMMAND neat