$ git clone -n https://src.fedoraproject.org/rpms/rust-encoding_rs_io.git /var/lib/mock/f45-build-41427-782/root/chroot_tmpdir/scmroot/rust-encoding_rs_io
Cloning into '/var/lib/mock/f45-build-41427-782/root/chroot_tmpdir/scmroot/rust-encoding_rs_io'...
$ git fetch origin 45172b7a3ff3764a2223a562f8efa4e8c8313acd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-encoding_rs_io
 * [new ref]         45172b7a3ff3764a2223a562f8efa4e8c8313acd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 45172b7 Update to version 0.1.8; Fixes RHBZ#2510982