$ git clone -n https://src.fedoraproject.org/rpms/arbor.git /var/lib/mock/f40-build-735264-106332/root/chroot_tmpdir/scmroot/arbor
Cloning into '/var/lib/mock/f40-build-735264-106332/root/chroot_tmpdir/scmroot/arbor'...
$ git fetch origin 942ac93a60d1d535c3dcce0961d39acbfe508dfb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/arbor
 * [new ref]         942ac93a60d1d535c3dcce0961d39acbfe508dfb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 942ac93 Fix ExcludeArch