$ git clone -n https://src.fedoraproject.org/rpms/rust-cpc.git /var/lib/mock/f41-build-811034-147135/root/chroot_tmpdir/scmroot/rust-cpc
Cloning into '/var/lib/mock/f41-build-811034-147135/root/chroot_tmpdir/scmroot/rust-cpc'...
$ git fetch origin 6b74253f11bdc004424aff065e85c3fbea615d38:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cpc
 * [new ref]         6b74253f11bdc004424aff065e85c3fbea615d38 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6b74253 Rebuild with Rust 1.78 to fix incomplete debuginfo and backtraces