$ git clone -n https://src.fedoraproject.org/rpms/sngrep.git /var/lib/mock/f45-build-36185-702/root/chroot_tmpdir/scmroot/sngrep
Cloning into '/var/lib/mock/f45-build-36185-702/root/chroot_tmpdir/scmroot/sngrep'...
$ git fetch origin 2c7ad8f0210ba48f377e3f23741c8a9df0506ae4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sngrep
 * [new ref]         2c7ad8f0210ba48f377e3f23741c8a9df0506ae4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2c7ad8f Upload a proper files