$ git clone -n https://src.fedoraproject.org/rpms/initial-setup.git /var/lib/mock/f40-build-2199396-51738/root/chroot_tmpdir/scmroot/initial-setup
Cloning into '/var/lib/mock/f40-build-2199396-51738/root/chroot_tmpdir/scmroot/initial-setup'...
$ git fetch origin 2006e19c5d4bd04c0593fdba51b1a7e56d415941:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/initial-setup
 * [new ref]         2006e19c5d4bd04c0593fdba51b1a7e56d415941 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2006e19 new version