$ git clone -n https://src.fedoraproject.org/rpms/rust2rpm-helper.git /var/lib/mock/f41-build-811000-147127/root/chroot_tmpdir/scmroot/rust2rpm-helper
Cloning into '/var/lib/mock/f41-build-811000-147127/root/chroot_tmpdir/scmroot/rust2rpm-helper'...
$ git fetch origin f6bbb6a1dee0051906b0131dcf5b790d221b34eb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust2rpm-helper
 * [new ref]         f6bbb6a1dee0051906b0131dcf5b790d221b34eb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f6bbb6a Rebuild with Rust 1.78 to fix incomplete debuginfo and backtraces