scripts: Update code signing scripts (#8746)

* scripts/codesign_example: Fix reference to SHASUM_PROG variable

* scripts/sign: Add check for required Artifactory token

scripts/codesign_example.sh

@@ -156,6 +156,6 @@ signed_checksum=$(
     | grep -i "x-checksum-sha256" | awk 'gsub("[\r\n]", "", $2) {print $2;}'
 )
 
-echo "${signed_checksum}  signed_${SN_ID}.zip" | SHASUM_PROG -c
+echo "${signed_checksum}  signed_${SN_ID}.zip" | $SHASUM_PROG -c
 
 mv "signed_${SN_ID}.zip" "$TARGET_ZIP"

scripts/sign.sh

@@ -8,6 +8,13 @@
 # export PRODUCT_NAME="packer"
 # export ARTIFACTORY_TOKEN=$ARTIFACTORY_TOKEN
 
+ARTIFACTORY_TOKEN="${ARTIFACTORY_TOKEN:-""}"
+
+if [ -z "$ARTIFACTORY_TOKEN" ]; then
+  echo "Missing required Artifactory credentials"
+  exit 1
+fi
+
 # Get the parent directory of where this script is.
 SOURCE="${BASH_SOURCE[0]}"
 while [ -h "$SOURCE" ] ; do SOURCE="$(readlink "$SOURCE")"; done