$ git clone -n https://src.fedoraproject.org/rpms/rust-uu_dd.git /var/lib/mock/f40-build-774040-127569/root/chroot_tmpdir/scmroot/rust-uu_dd
Cloning into '/var/lib/mock/f40-build-774040-127569/root/chroot_tmpdir/scmroot/rust-uu_dd'...
$ git fetch origin d78f26aae8ec51220e1a7ac743173b8bf704b86f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-uu_dd
 * [new ref]         d78f26aae8ec51220e1a7ac743173b8bf704b86f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d78f26a Initial package (rhbz#2257482)