$ git clone -n https://src.fedoraproject.org/rpms/fast_float.git /var/lib/mock/f45-build-8694-394/root/chroot_tmpdir/scmroot/fast_float
Cloning into '/var/lib/mock/f45-build-8694-394/root/chroot_tmpdir/scmroot/fast_float'...
$ git fetch origin 57169f907706723715c8081c733faae935dfe3ec:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fast_float
 * [new ref]         57169f907706723715c8081c733faae935dfe3ec -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 57169f9 Update to 8.3.0 (close RHBZ#2533994)