$ git clone -n https://src.fedoraproject.org/rpms/rust-uu_uniq.git /var/lib/mock/f40-build-1971933-25224/root/chroot_tmpdir/scmroot/rust-uu_uniq
Cloning into '/var/lib/mock/f40-build-1971933-25224/root/chroot_tmpdir/scmroot/rust-uu_uniq'...
$ git fetch origin b5d2ccf1d1882a9d7bcc4fd431753e0f3fb827f6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-uu_uniq
 * [new ref]         b5d2ccf1d1882a9d7bcc4fd431753e0f3fb827f6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b5d2ccf Update to version 0.0.27; Fixes: RHBZ#2260254