$ git clone -n https://src.fedoraproject.org/rpms/kgamma.git /var/lib/mock/f40-build-2049276-49016/root/chroot_tmpdir/scmroot/kgamma
Cloning into '/var/lib/mock/f40-build-2049276-49016/root/chroot_tmpdir/scmroot/kgamma'...
$ git fetch origin 3b8cabba9d63500806928b50deb23b0d5353abbc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kgamma
 * [new ref]         3b8cabba9d63500806928b50deb23b0d5353abbc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3b8cabb fix: upload missing sources