$ git clone -n https://src.fedoraproject.org/rpms/rust-chardetng.git /var/lib/mock/f40-build-2306126-57132/root/chroot_tmpdir/scmroot/rust-chardetng
Cloning into '/var/lib/mock/f40-build-2306126-57132/root/chroot_tmpdir/scmroot/rust-chardetng'...
$ git fetch origin d5a7d4c7436979d087f9d7b899d4a46a657aa4ca:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-chardetng
 * [new ref]         d5a7d4c7436979d087f9d7b899d4a46a657aa4ca -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d5a7d4c Initial package (rhbz#2245724)