$ git clone -n https://src.fedoraproject.org/rpms/zathura-pdf-mupdf.git /var/lib/mock/f41-build-811710-147509/root/chroot_tmpdir/scmroot/zathura-pdf-mupdf
Cloning into '/var/lib/mock/f41-build-811710-147509/root/chroot_tmpdir/scmroot/zathura-pdf-mupdf'...
$ git fetch origin ba698e0274b5f2e6db6a6d4d7b06621a02d0bbdf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/zathura-pdf-mupdf
 * [new ref]         ba698e0274b5f2e6db6a6d4d7b06621a02d0bbdf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ba698e0 Rebuild against zathura 0.5.6