$ git clone -n https://src.fedoraproject.org/rpms/zathura.git /var/lib/mock/f40-build-2158127-50939/root/chroot_tmpdir/scmroot/zathura
Cloning into '/var/lib/mock/f40-build-2158127-50939/root/chroot_tmpdir/scmroot/zathura'...
$ git fetch origin b3471c91137a5a1a039f44b86aaa9e0327d6f066:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/zathura
 * [new ref]         b3471c91137a5a1a039f44b86aaa9e0327d6f066 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b3471c9 Fix flatpak build