$ git clone -n https://src.fedoraproject.org/rpms/numberstation.git /var/lib/mock/f40-build-1836067-24952/root/chroot_tmpdir/scmroot/numberstation
Cloning into '/var/lib/mock/f40-build-1836067-24952/root/chroot_tmpdir/scmroot/numberstation'...
$ git fetch origin 6dbaef1189fe71ea458d0d4886e2eb08accb0998:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/numberstation
 * [new ref]         6dbaef1189fe71ea458d0d4886e2eb08accb0998 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6dbaef1 Update to v1.4.0 (fedora#2298798)