$ git clone -n https://src.fedoraproject.org/rpms/krfb.git /var/lib/mock/f40-build-1036797-18696/root/chroot_tmpdir/scmroot/krfb
Cloning into '/var/lib/mock/f40-build-1036797-18696/root/chroot_tmpdir/scmroot/krfb'...
$ git fetch origin b16864acc9a35532e352298422cca748745684ea:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/krfb
 * [new ref]         b16864acc9a35532e352298422cca748745684ea -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b16864a Merge branch 'rawhide' into f40