net: l2: wifi: Make build time certs as optional

Certificates usage depends on STA/AP mode, but we don't have that information at a build time, so, make all certs as optional and if a file isn't found then generate an empty header so that corresponding C code will be built. Any missing mandatory certificates will be validated before connection and connection is failed. Signed-off-by: Chaitanya Tata <Chaitanya.Tata@nordicsemi.no>

Author: krish2718

subsys/net/l2/wifi/CMakeLists.txt

@@ -33,53 +33,28 @@ if(CONFIG_WIFI_NM_WPA_SUPPLICANT_CRYPTO_ENTERPRISE AND CONFIG_NET_L2_WIFI_SHELL)
  # convert .pem files to array data at build time
  zephyr_include_directories(${gen_inc_dir})
 
- generate_inc_file_for_target(
- app
+ foreach(cert_file IN ITEMS
  ${ZEPHYR_BASE}/samples/net/wifi/test_certs/client.pem
- ${gen_dir}/client.pem.inc
- )
-
- generate_inc_file_for_target(
- app
  ${ZEPHYR_BASE}/samples/net/wifi/test_certs/client-key.pem
- ${gen_dir}/client-key.pem.inc
- )
-
- generate_inc_file_for_target(
- app
  ${ZEPHYR_BASE}/samples/net/wifi/test_certs/ca.pem
- ${gen_dir}/ca.pem.inc
- )
-
- generate_inc_file_for_target(
- app
  ${ZEPHYR_BASE}/samples/net/wifi/test_certs/client2.pem
- ${gen_dir}/client2.pem.inc
- )
-
- generate_inc_file_for_target(
- app
  ${ZEPHYR_BASE}/samples/net/wifi/test_certs/client-key2.pem
- ${gen_dir}/client-key2.pem.inc
- )
-
- generate_inc_file_for_target(
- app
  ${ZEPHYR_BASE}/samples/net/wifi/test_certs/ca2.pem
- ${gen_dir}/ca2.pem.inc
- )
-
- generate_inc_file_for_target(
- app
  ${ZEPHYR_BASE}/samples/net/wifi/test_certs/server.pem
- ${gen_dir}/server.pem.inc
- )
-
- generate_inc_file_for_target(
- app
  ${ZEPHYR_BASE}/samples/net/wifi/test_certs/server-key.pem
- ${gen_dir}/server-key.pem.inc
  )
+ if(EXISTS ${cert_file})
+ get_filename_component(cert_name ${cert_file} NAME)
+ generate_inc_file_for_target(
+ app
+ ${cert_file}
+ ${gen_dir}/${cert_name}.inc
+ )
+ else()
+ get_filename_component(cert_name ${cert_file} NAME)
+ file(WRITE ${gen_dir}/${cert_name}.inc "// Empty file generated because ${cert_file} does not exist\n")
+ endif()
+ endforeach()
 
  # Add explicit dependency on app target for ZEPHYR_CURRENT_LIBRARY, so these
  # headers are generated at the correct point in the build