$ git clone -n https://src.fedoraproject.org/rpms/rust-tabular.git /var/lib/mock/f41-build-side-1-3134943-39764/root/chroot_tmpdir/scmroot/rust-tabular
Cloning into '/var/lib/mock/f41-build-side-1-3134943-39764/root/chroot_tmpdir/scmroot/rust-tabular'...
$ git fetch origin 10370a52be8cff99b5d69ed0aaa3b8272c35ca54:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-tabular
 * [new ref]         10370a52be8cff99b5d69ed0aaa3b8272c35ca54 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 10370a5 unused leaf package for more than two release cycles