Overhaul cache system

scripts.d/50-davs2.sh

@@ -12,11 +12,11 @@ ffbuild_enabled() {
 }
 
 ffbuild_dockerdl() {
-    to_df "RUN git clone \"$SCRIPT_REPO\" \"$SELF\" && git -C \"$SELF\" checkout \"$SCRIPT_COMMIT\""
+    default_dl .
+    echo "git fetch --unshallow"
 }
 
 ffbuild_dockerbuild() {
-    cd "$FFBUILD_DLDIR/$SELF"
     cd build/linux
 
     local myconf=(