$ git clone -n https://src.fedoraproject.org/rpms/rust-potential_utf.git /var/lib/mock/f45-build-43946-809/root/chroot_tmpdir/scmroot/rust-potential_utf
Cloning into '/var/lib/mock/f45-build-43946-809/root/chroot_tmpdir/scmroot/rust-potential_utf'...
$ git fetch origin 71f96e7438eb207e0276f270e7975ae3d6bea91a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-potential_utf
 * [new ref]         71f96e7438eb207e0276f270e7975ae3d6bea91a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 71f96e7 Update to version 0.1.6; Fixes RHBZ#2515906