$ git clone -n https://src.fedoraproject.org/rpms/btop.git /var/lib/mock/f40-build-801469-143788/root/chroot_tmpdir/scmroot/btop
Cloning into '/var/lib/mock/f40-build-801469-143788/root/chroot_tmpdir/scmroot/btop'...
$ git fetch origin 98d358afceed5028ffea595761f54c389e00f74d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/btop
 * [new ref]         98d358afceed5028ffea595761f54c389e00f74d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 98d358a update sources