$ git clone -n https://src.fedoraproject.org/rpms/retsnoop.git /var/lib/mock/f40-build-789888-136126/root/chroot_tmpdir/scmroot/retsnoop
Cloning into '/var/lib/mock/f40-build-789888-136126/root/chroot_tmpdir/scmroot/retsnoop'...
$ git fetch origin ecae11a83c6e275d72f6a1f480a5d19a6e71ff8e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/retsnoop
 * [new ref]         ecae11a83c6e275d72f6a1f480a5d19a6e71ff8e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ecae11a Update to 0.9.8