$ git clone -n https://src.fedoraproject.org/rpms/zathura-pdf-mupdf.git /var/lib/mock/f40-build-752711-116835/root/chroot_tmpdir/scmroot/zathura-pdf-mupdf
Cloning into '/var/lib/mock/f40-build-752711-116835/root/chroot_tmpdir/scmroot/zathura-pdf-mupdf'...
$ git fetch origin 52466c88c66f94e2571cc527972c03f147dc00c9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/zathura-pdf-mupdf
 * [new ref]         52466c88c66f94e2571cc527972c03f147dc00c9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 52466c8 Update to 0.4.1 (rhbz#2238877)