commit cbccfed4b39fd49cdb5366194b516a32ace58d62
author Jonathan Tan <jonathantanmy@google.com> Thu May 23 13:28:53 2019 -0700
committer Jonathan Tan <jonathantanmy@google.com> Tue Jun 25 09:22:47 2019 -0700
tree 87c43e58b8edbdc6d501266bec88a8579d2827c2
parent 4b0c192f2de569cc7039ca4b03fe9eb0e714599c

UploadPack: support lazy fetches if no bitmap

If a client clones with "--filter=blob:none", the checkout that "git
clone" automatically does causes the client to fetch all blobs at HEAD.
When fetching from a non-bitmapped repository, this will fail if an
object walk is ever needed, because JGit currently rejects such requests
- see the commit message of d3021788d2 ("Use bitmaps for non-commit
reachability checks", 2017-11-10) for more information.

Rejecting such requests in the absence of bitmaps is probably
overzealous: it is true that the server would prefer to have bitmaps in
this case, but there might be a small proportion of repos (for example,
very small repos or newly created ones) that do not have bitmaps, yet
the server would still like to have partial clones for them.

So, allow such requests, performing the object walk reachability check
if necessary. Limit this to servers with "uploadpack.allowFilter"
configured, so that servers wanting to support partial clone have this
functionality, and servers that do not support partial clone do not have
to pay the object walk reachability check cost.

Change-Id: I51964bafec68696a799625d627615b4f45ddbbbf
Signed-off-by: Jonathan Tan <jonathantanmy@google.com>