$ git clone -n https://src.fedoraproject.org/rpms/rust-capnp-futures.git /var/lib/mock/f40-build-2259976-54391/root/chroot_tmpdir/scmroot/rust-capnp-futures
Cloning into '/var/lib/mock/f40-build-2259976-54391/root/chroot_tmpdir/scmroot/rust-capnp-futures'...
$ git fetch origin 01c5a57771c3a8af1d8bb4460ac38a25fd9c0b06:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-capnp-futures
 * [new ref]         01c5a57771c3a8af1d8bb4460ac38a25fd9c0b06 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 01c5a57 Update to version 0.18.2; Fixes RHBZ#2139860