$ git clone -n https://src.fedoraproject.org/rpms/rust-gix-protocol.git /var/lib/mock/f42-build-3262673-41241/root/chroot_tmpdir/scmroot/rust-gix-protocol
Cloning into '/var/lib/mock/f42-build-3262673-41241/root/chroot_tmpdir/scmroot/rust-gix-protocol'...
$ git fetch origin e56c6512d8f8ef778b3ddb7f3a72b4258fc78ee1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gix-protocol
 * [new ref]         e56c6512d8f8ef778b3ddb7f3a72b4258fc78ee1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e56c651 Update to version 0.48.0 (rhbz#2321176)