$ git clone -n https://src.fedoraproject.org/rpms/rust-bitstream-io.git /var/lib/mock/f40-build-2035073-47934/root/chroot_tmpdir/scmroot/rust-bitstream-io
Cloning into '/var/lib/mock/f40-build-2035073-47934/root/chroot_tmpdir/scmroot/rust-bitstream-io'...
$ git fetch origin 69a0d7b7339a4cce2ee415118c7fe74ca16ca2d1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-bitstream-io
 * [new ref]         69a0d7b7339a4cce2ee415118c7fe74ca16ca2d1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 69a0d7b Update to version 1.10.0; Fixes RHBZ#2251807