Re: [PATCH v2 01/10] bundle: optionally skip reachability walk

> From: Derrick Stolee <derrickstolee@github.com>
>
> When unbundling a bundle, the verify_bundle() method checks two things
> with regards to the prerequisite commits:
>
>  1. Those commits are in the object store, and
>  2. Those commits are reachable from refs.
>
> During testing of the bundle URI feature, where multiple bundles are
> unbundled in the same process, the ref store did not appear to be
> refreshing with the new refs/bundles/* references added within that
> process. This caused the second half -- the reachability walk -- report
> that some commits were not present, despite actually being present.
>
> One way to attempt to fix this would be to create a way to force-refresh
> the ref state. That would correct this for these cases where the
> refs/bundles/* references have been updated. However, this still is an
> expensive operation in a repository with many references.
>
> Instead, optionally allow callers to skip this portion by instead just
> checking for presence within the object store. Use this when unbundling
> in bundle-uri.c.