virtualboxExtpack: set pname and version (#488671)

pkgs/applications/virtualization/virtualbox/extpack.nix

@@ -3,12 +3,11 @@
   lib,
   virtualbox,
 }:
-let
-  virtualboxExtPackVersion = "7.2.6";
-in
 fetchurl rec {
-  name = "Oracle_VirtualBox_Extension_Pack-${virtualboxExtPackVersion}.vbox-extpack";
-  url = "https://download.virtualbox.org/virtualbox/${virtualboxExtPackVersion}/${name}";
+  pname = "virtualbox-extpack";
+  version = "7.2.6";
+  name = "Oracle_VirtualBox_Extension_Pack-${version}.vbox-extpack";
+  url = "https://download.virtualbox.org/virtualbox/${version}/${name}";
   sha256 =
     # Manually sha256sum the extensionPack file, must be hex!
     # Thus do not use `nix-prefetch-url` but instead plain old `sha256sum`.

pkgs/applications/virtualization/virtualbox/update.sh

@@ -39,7 +39,7 @@ if [ ! "$oldVersion" = "$latestVersion" ]; then
       -e "s/virtualboxSha256 = \".*\";/virtualboxSha256 = \"$virtualBoxShaSum\";/g" \
       -i "$virtualboxNixFile"
   sed -e 's|value = "'$extpackOldShaSum'"|value = "'$extpackShaSum'"|' \
-      -e "s/virtualboxExtPackVersion = \".*\";/virtualboxExtPackVersion = \"$latestVersion\";/g" \
+      -e "s/version = \".*\";/version = \"$latestVersion\";/g" \
       -i $extpackNixFile
   sed -e "s/sha256 = \".*\";/sha256 = \"$guestAdditionsIsoShaSum\";/g" \
       -i "$guestAdditionsIsoNixFile"