capsule_cabinet.sh: make it work independent of .config

Extract the coreboot config from the capsule itself, in order to be able
to use the script on any coreboot capsules.

Upstream-Status: Inappropriate [Dasharo downstream]
Change-Id: I49f2fb91423b912d98d55ca5e0e008b483d1322c
Signed-off-by: Michał Kopeć <[email protected]>

Author: mkopec

capsule_cabinet.sh

@@ -3,6 +3,9 @@
 
 set -e
 
+edk_workspace=${EDK_WORKSPACE:-payloads/external/edk2/workspace/Dasharo}
+edk_tools=${edk_workspace}/BaseTools/BinWrappers/PosixLike
+
 function die() {
     echo error: "$@" 1>&2
     exit 1
@@ -24,17 +27,6 @@ if [ ! -f .config ]; then
     die "No '.config' file in current directory"
 fi
 
-# import coreboot's config file replacing $(...) with ${...}
-while read -r line; do
-    if ! eval "$line"; then
-        die "failed to source '.config'"
-    fi
-done <<< "$(sed 's/\$(\([^)]\+\))/${\1}/g' .config)"
-
-if [ "$CONFIG_DRIVERS_EFI_UPDATE_CAPSULES" != y ]; then
-    die "Current board configuration lacks support of update capsules"
-fi
-
 capsule=$1
 date=$(stat -c %w $capsule | cut -d ' ' -f 1)
 vendor=$(cat .config | grep -e "CONFIG_VENDOR_.*=y" | cut -d '=' -f 1 | cut -d '_' -f 3- | awk '{ print tolower($0) }')
@@ -74,6 +66,25 @@ cat > "${archive_dir}/firmware.metainfo.xml" << EOF
 
 EOF
 
+decode_dir=$(mktemp --tmpdir -d XXXXXXXX)
+if ! "${edk_tools}/GenerateCapsule" --decode $capsule --output $decode_dir/capsule; then
+  die "GenerateCapsule --decode failed!"
+fi
+cbfstool $decode_dir/capsule.Payload.1.bin extract -r COREBOOT -n config -f $decode_dir/config
+
+# import coreboot's config file replacing $(...) with ${...}
+while read -r line; do
+    if ! eval "$line"; then
+        die "failed to source 'config'"
+    fi
+done <<< "$(sed 's/\$(\([^)]\+\))/${\1}/g' $decode_dir/config)"
+
+rm -r $decode_dir
+
+if [ "$CONFIG_DRIVERS_EFI_UPDATE_CAPSULES" != y ]; then
+    die "Current board configuration lacks support of update capsules"
+fi
+
 cp $capsule $archive_dir/firmware.bin
 
 pushd $archive_dir &> /dev/null