$ git clone -n https://src.fedoraproject.org/rpms/rust-wayland-server.git /var/lib/mock/f42-build-side-1-3573367-46767/root/chroot_tmpdir/scmroot/rust-wayland-server
Cloning into '/var/lib/mock/f42-build-side-1-3573367-46767/root/chroot_tmpdir/scmroot/rust-wayland-server'...
$ git fetch origin 015e4e50e7a5783ab8c28b60dea4a222d1cfb88c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-wayland-server
 * [new ref]         015e4e50e7a5783ab8c28b60dea4a222d1cfb88c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 015e4e5 Update to version 0.31.9; Fixes RHBZ#2362779