$ git clone -n https://src.fedoraproject.org/rpms/rust-dtoa.git /var/lib/mock/f38-build-side-43-rust-devel-1415784-31455/root/chroot_tmpdir/scmroot/rust-dtoa
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1415784-31455/root/chroot_tmpdir/scmroot/rust-dtoa'...
$ git fetch origin 111e83c5a8825a852657efaf75ea3d7f027c1eab:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-dtoa
 * [new ref]         111e83c5a8825a852657efaf75ea3d7f027c1eab -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 111e83c Update to version 1.0.9; Fixes RHBZ#2223127