Re: [RFC PATCH v2 4/4] sha1_file: support promised object hook

> >> This is meant as a temporary measure to ensure that all Git commands
> >> work in such a situation. Future patches will update some commands to
> >> either tolerate promised objects (without invoking the hook) or be more
> >> efficient in invoking the promised objects hook.
> 
> I agree that making git more tolerant of promised objects if possible 
> and precomputing a list of promised objects required to complete a 
> particular command and downloading them with a single request are good 
> optimizations to add over time.

> has_sha1_file also takes a hash "whether local or in an alternate object 
> database, and whether packed or loose" but never calls 
> sha1_object_info_extended.  As a result, we had to add support in 
> check_and_freshen to download missing objects to get proper behavior in 
> all cases.  I don't think this will work correctly without it.