$ git clone -n https://src.fedoraproject.org/rpms/rustup.git /var/lib/mock/f41-build-810833-146965/root/chroot_tmpdir/scmroot/rustup
Cloning into '/var/lib/mock/f41-build-810833-146965/root/chroot_tmpdir/scmroot/rustup'...
$ git fetch origin 74e178f068d7f0bf1e3931c554c6548220b1ae0d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rustup
 * [new ref]         74e178f068d7f0bf1e3931c554c6548220b1ae0d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 74e178f Rebuild with Rust 1.78 to fix incomplete debuginfo and backtraces