Comment 30 for bug 2065180

Ooooh, right. The hook might want to call something like `depmod` against the modules.

So, that's a reasonable thing for a user-configured hook to do, which means we can't break it in an SRU. It *would* still be nice to get the significant speedup you've got here, though. Could this change to `manual_add_modules` *only* apply to hooks installed by packages (ie: in /usr/share/initramfs-tools)? Those we *can* fix.