update-source-version: Check for sources not dependent on ${version}

pkgs/common-updater/scripts/update-source-version

@@ -82,6 +82,11 @@ if [ -z "$newHash" ]; then
     die "Couldn't figure out new hash of '$attr.src'!"
 fi
 
+if [ "$oldVersion" != "$newVersion" ] && [ "$oldHash" = "$newHash" ]; then
+    mv "$nixFile.bak" "$nixFile"
+    die "Both the old and new source hashes of '$attr.src' were equivalent. Please fix the package's source URL to be dependent on '\${version}'!"
+fi
+
 sed -i "$nixFile" -re "s|\"$tempHash\"|\"$newHash\"|"
 if cmp -s "$nixFile" "$nixFile.bak"; then
     die "Failed to replace temporary source hash of '$attr' to the final source hash!"