Add post-build script

Modify a couple of /etc/ files in the buildroot images to help boot and
attest a realm.

Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>

configs/cca_defconfig

@@ -25,3 +25,4 @@ BR2_PACKAGE_QEMU_TARGET_AARCH64=y
 BR2_PACKAGE_REALM_TOKEN=y
 BR2_PACKAGE_CCA_WORKLOAD_ATTESTATION=y
 
+BR2_ROOTFS_POST_BUILD_SCRIPT="$(BR2_EXTERNAL_LINARO_CCA_PATH)/scripts/post-build.sh"

scripts/post-build.sh

+#!/bin/bash
+#
+# Modify the buildroot target files before they are packed into the final
+# images
+#
+
+# Add config and 9p mounts used for CCA demos
+if ! grep -q "shr0" $TARGET_DIR/etc/fstab; then
+    cat << EOF >> $TARGET_DIR/etc/fstab
+    configfs    /sys/kernel/config      configfs    defaults        0       0
+    shr0        /mnt/                   9p          nofail          0       0
+    FM          /mnt/                   9p          nofail          0       0
+EOF
+fi
+
+# Add address for Linaro veraison verifier
+if ! grep -q "veraison" $TARGET_DIR/etc/hosts; then
+    cat << EOF >> $TARGET_DIR/etc/hosts
+    # This service is provided for development purposes only as detailed here:
+    # http://veraison.test.linaro.org/disclaimer.html
+    213.146.141.101        veraison.example
+EOF
+fi
+