$ git clone -n https://src.fedoraproject.org/rpms/nfs-ganesha.git /var/lib/mock/f40-build-2195069-51513/root/chroot_tmpdir/scmroot/nfs-ganesha
Cloning into '/var/lib/mock/f40-build-2195069-51513/root/chroot_tmpdir/scmroot/nfs-ganesha'...
$ git fetch origin cb1677a3d8b7592df7170175325adb6f096b5a11:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nfs-ganesha
 * [new ref]         cb1677a3d8b7592df7170175325adb6f096b5a11 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cb1677a rebuild with (lib)prometheus-cpp-1.2.0