More support for SF.net in auto-updater

pkgs/build-support/upstream-updater/update-walker-service-specific.sh

@@ -8,6 +8,10 @@ SF_version_dir () {
   version_link 'http://sourceforge.net/.+/'"$1"'[0-9.]+/$'
 }
 
+SF_version_tarball () {
+  version_link '[.]tar[.].*/download$'
+}
+
 GH_latest () {
   prefetch_command_rel ../fetchgit/nix-prefetch-git
   revision "$("$(dirname "$0")/urls-from-page.sh" "$CURRENT_URL/commits" | grep /commit/ | head -n 1 | xargs basename )"

pkgs/build-support/upstream-updater/update-walker.sh

@@ -280,6 +280,12 @@ do_overwrite_just_version () {
   set_var_value sha256 $CURRENT_HASH
 }
 
+minimize_overwrite() {
+  do_overwrite(){
+    do_overwrite_just_version
+  }
+}
+
 process_config () {
   CONFIG_DIR="$(directory_of "$1")"
   CONFIG_NAME="$(basename "$1")"
@@ -297,9 +303,7 @@ process_config () {
       exit 1;
     }
     [ -z "$(retrieve_meta fullRegenerate)" ] && eval "
-      do_overwrite(){
-        do_overwrite_just_version
-      }
+      minimize_overwrite
     "
   fi
   ensure_attribute_name