$ git clone -n https://src.fedoraproject.org/rpms/zathura-cb.git /var/lib/mock/f40-build-773815-127386/root/chroot_tmpdir/scmroot/zathura-cb
Cloning into '/var/lib/mock/f40-build-773815-127386/root/chroot_tmpdir/scmroot/zathura-cb'...
$ git fetch origin 11fb606adef67934545c2e7c16265ab4b07391b4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/zathura-cb
 * [new ref]         11fb606adef67934545c2e7c16265ab4b07391b4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 11fb606 Rebuild against zathura 0.5.4