+ # newly installed packages set the source package to 1
+ $installed{$src} and $installed{$src} == 1 and return 0;
+
+ # we'll trigger the override only with the 3 conditions below:
+ # - override is allowed by command line (-f)
+ # - a package with the same src exists in the core packages list
+ # - the package previously installed is not from a feed
+ my $override = 1 if ($force and is_core_package($src) and !$installed{$name}->{feed});