$ git clone -n https://src.fedoraproject.org/rpms/rust-uu_link.git /var/lib/mock/f41-build-810850-146973/root/chroot_tmpdir/scmroot/rust-uu_link
Cloning into '/var/lib/mock/f41-build-810850-146973/root/chroot_tmpdir/scmroot/rust-uu_link'...
$ git fetch origin 396f4a5070e19fa4ca92b2ea3db48010978a7fcd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-uu_link
 * [new ref]         396f4a5070e19fa4ca92b2ea3db48010978a7fcd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 396f4a5 Rebuild with Rust 1.78 to fix incomplete debuginfo and backtraces