$ git clone -n https://src.fedoraproject.org/rpms/rust-ron0.7.git /var/lib/mock/f40-build-2259041-54361/root/chroot_tmpdir/scmroot/rust-ron0.7
Cloning into '/var/lib/mock/f40-build-2259041-54361/root/chroot_tmpdir/scmroot/rust-ron0.7'...
$ git fetch origin 238d68ec0fc8f64deff653ba7fd195c0e5ba2895:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-ron0.7
 * [new ref]         238d68ec0fc8f64deff653ba7fd195c0e5ba2895 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 238d68e Skip tests that fail with serde 1.0.181 and newer