$ git clone -n https://src.fedoraproject.org/rpms/rust-rbspy.git /var/lib/mock/f42-build-side-1-3581442-46829/root/chroot_tmpdir/scmroot/rust-rbspy
Cloning into '/var/lib/mock/f42-build-side-1-3581442-46829/root/chroot_tmpdir/scmroot/rust-rbspy'...
$ git fetch origin 6c1da68fff6fa6250234d388fa60416e5f21af9c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rbspy
 * [new ref]         6c1da68fff6fa6250234d388fa60416e5f21af9c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6c1da68 Update to version 0.31.0; Fixes RHBZ#2310122