$ git clone -n https://src.fedoraproject.org/rpms/rust-nu-cmd-lang.git /var/lib/mock/f38-build-side-42-init-devel-1153844-30498/root/chroot_tmpdir/scmroot/rust-nu-cmd-lang
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1153844-30498/root/chroot_tmpdir/scmroot/rust-nu-cmd-lang'...
$ git fetch origin 6c2243de41e236821471172c9742fe27e41b7e9f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-nu-cmd-lang
 * [new ref]         6c2243de41e236821471172c9742fe27e41b7e9f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6c2243d Initial Fedora package