$ git clone -n https://src.fedoraproject.org/rpms/rust-webpki.git /var/lib/mock/f41-build-side-1-3133575-39692/root/chroot_tmpdir/scmroot/rust-webpki
Cloning into '/var/lib/mock/f41-build-side-1-3133575-39692/root/chroot_tmpdir/scmroot/rust-webpki'...
$ git fetch origin 72320c66f556cc2bc289e7c0ab4a16e75c8537e4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-webpki
 * [new ref]         72320c66f556cc2bc289e7c0ab4a16e75c8537e4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 72320c6 unused leaf package for more than two release cycles