$ git clone -n https://src.fedoraproject.org/rpms/rust-below-store.git /var/lib/mock/f42-build-side-1-3512364-46069/root/chroot_tmpdir/scmroot/rust-below-store
Cloning into '/var/lib/mock/f42-build-side-1-3512364-46069/root/chroot_tmpdir/scmroot/rust-below-store'...
$ git fetch origin 390e38ce2bcd93805e844fbb038b808f259f568d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-below-store
 * [new ref]         390e38ce2bcd93805e844fbb038b808f259f568d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 390e38c Update to 0.9.0; Fixes: RHBZ#2347638