$ git clone -n https://src.fedoraproject.org/rpms/rust-criterion-plot.git /var/lib/mock/f41-build-side-1-2940029-35321/root/chroot_tmpdir/scmroot/rust-criterion-plot
Cloning into '/var/lib/mock/f41-build-side-1-2940029-35321/root/chroot_tmpdir/scmroot/rust-criterion-plot'...
$ git fetch origin 839eefc2e0b30366a04b834d66c1c4e0046bf81e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-criterion-plot
 * [new ref]         839eefc2e0b30366a04b834d66c1c4e0046bf81e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 839eefc unused leaf package for more than two release cycles