$ git clone -n https://src.fedoraproject.org/rpms/rust-rbspy-ruby-structs /var/lib/mock/f42-build-3453406-45488/root/chroot_tmpdir/scmroot/rust-rbspy-ruby-structs
Cloning into '/var/lib/mock/f42-build-3453406-45488/root/chroot_tmpdir/scmroot/rust-rbspy-ruby-structs'...
$ git fetch origin feb8478c75c442dcc96074e62647ee51c5f8e362:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rbspy-ruby-structs
 * [new ref]         feb8478c75c442dcc96074e62647ee51c5f8e362 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at feb8478 Update to version 0.31.0; Fixes RHBZ#2310123