$ git clone -n https://src.fedoraproject.org/rpms/rust-smallvec.git /var/lib/mock/f43-build-59141472-6571290/root/chroot_tmpdir/scmroot/rust-smallvec
Cloning into '/var/lib/mock/f43-build-59141472-6571290/root/chroot_tmpdir/scmroot/rust-smallvec'...
$ git fetch origin e196ed1005e05a9c2fdf75e78afd34859273456f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-smallvec
 * [new ref]         e196ed1005e05a9c2fdf75e78afd34859273456f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e196ed1 Update to version 1.15.0