arm: Set FVP EULA environment variable details message

Set the FVP EULA environment variable details message
to request the user to accept the EULA in case it has
not been accepted.

Signed-off-by: Ziad Elhanafy <Ziad.Elhanafy@arm.com>
Signed-off-by: Jon Mason <jon.mason@arm.com>

meta-arm/recipes-devtools/fvp/fvp-common.inc

@@ -1,12 +1,20 @@
 HOMEPAGE = "https://developer.arm.com/tools-and-software/simulation-models/fixed-virtual-platforms"
 
-# FVP has an End User License Agreement. Add Arm-FVP-EULA to your
-# LICENSE_FLAGS_ACCEPTED if you agree to these terms.
 LICENSE_FLAGS = "Arm-FVP-EULA"
-LICENSE_FLAGS_DETAILS[Arm-FVP-EULA] = "https://developer.arm.com/downloads/-/arm-ecosystem-fvps/eula"
-
 LICENSE = "Proprietary & Apache-2.0 & Python-2.0 & GPL-3.0-with-GCC-exception & Zlib & NCSA & LGPL-2.0-or-later & MIT & BSD-3-Clause"
 
+# FVP has an End User License Agreement. Add Arm-FVP-EULA to
+# LICENSE_FLAGS_ACCEPTED if the EULA has been accepted, so it can
+# be later checked if the user accepted the EULA or not and if
+# not display a message to the user requesting them to do so.
+LICENSE_FLAGS_ACCEPTED:append = " ${@oe.utils.vartrue('ARM_FVP_EULA_ACCEPT', 'Arm-FVP-EULA', '', d)}"
+
+LICENSE_FLAGS_DETAILS[Arm-FVP-EULA] = " \
+Accept the END USER LICENSE AGREEMENT FOR ARM SOFTWARE DEVELOPMENT TOOLS. \
+Please refer to 'https://developer.arm.com/downloads/-/arm-ecosystem-fvps/eula'\
+${@bb.utils.contains('BB_ENV_PASSTHROUGH_ADDITIONS', 'ARM_FVP_EULA_ACCEPT', ' and export ARM_FVP_EULA_ACCEPT to 1', '', d)}.\
+"
+
 COMPATIBLE_HOST = "x86_64.*-linux"
 
 # The architecture-specific download filename suffix