"Shallow Since" Clones Support

[RonAmihai]

Due to the recent official shallow clone support, I wonder if adding support for "shallow since" clones is possible.

That means git clone ... --shallow-since=<date>
(where date can be either date string or numeric timestamp)

[lrm29]

I think so, need to add "deepen-since" (https://git-scm.com/docs/protocol-v2) to git_pkt_buffer_wants (you'll see where "deepen" is written in that function).

Then add "deepen_since" as a field to git_fetch_options and pass that all the way through to git_pkt_buffer_wants.