capsule.sh: support passing EDK2 dir as env variable

Change-Id: Ifcf41a2fad283344a36e0e0fd7508d03d028e7a8
Signed-off-by: Michał Kopeć <[email protected]>

Author: mkopec

capsule.sh

@@ -2,9 +2,9 @@
 
 set -e
 
-edk_workspace=payloads/external/edk2/workspace
-edk_tools=${edk_workspace}/Dasharo/BaseTools/BinWrappers/PosixLike
-edk_scripts=${edk_workspace}/Dasharo/BaseTools/Scripts
+edk_workspace=${EDK_WORKSPACE:-payloads/external/edk2/workspace/Dasharo}
+edk_tools=${edk_workspace}/BaseTools/BinWrappers/PosixLike
+edk_scripts=${edk_workspace}/BaseTools/Scripts
 
 function die() {
     echo error: "$@" 1>&2
@@ -128,9 +128,11 @@ EOF
     echo 01 > test-ca/serial
 
     openssl x509 -in root.pub.pem -out root.cer -outform DER
-    python "${OLDPWD}/${edk_scripts}/BinToPcd.py" \
+    cd ..
+    python "${edk_scripts}/BinToPcd.py" \
         -p gFmpDevicePkgTokenSpaceGuid.PcdFmpDevicePkcs7CertBufferXdr \
-        -i root.cer -x -o CapsuleRootKey.inc
+        -i $dir/root.cer -x -o CapsuleRootKey.inc
+    cd "$dir"
 
     print_banner 'Making subroot certificate'