$ git clone -n https://src.fedoraproject.org/rpms/rust-uu_fmt.git /var/lib/mock/f40-build-774048-127569/root/chroot_tmpdir/scmroot/rust-uu_fmt
Cloning into '/var/lib/mock/f40-build-774048-127569/root/chroot_tmpdir/scmroot/rust-uu_fmt'...
$ git fetch origin dd41a2919eae962d86bed76ac4e2fa5404b52636:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-uu_fmt
 * [new ref]         dd41a2919eae962d86bed76ac4e2fa5404b52636 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dd41a29 Initial package (rhbz#2258123)