$ git clone -n https://src.fedoraproject.org/rpms/rust-mio0.7.git /var/lib/mock/f38-build-side-43-rust-devel-1410395-31417/root/chroot_tmpdir/scmroot/rust-mio0.7
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1410395-31417/root/chroot_tmpdir/scmroot/rust-mio0.7'...
$ git fetch origin 83c921c8f6798dc897fb3c381853273ee9121fd4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-mio0.7
 * [new ref]         83c921c8f6798dc897fb3c381853273ee9121fd4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 83c921c Fix compiling net::udp::UdpSocket doctest with Rust 1.71