$ git clone -n https://src.fedoraproject.org/rpms/rust-uu_nl.git /var/lib/mock/f41-build-811115-147145/root/chroot_tmpdir/scmroot/rust-uu_nl
Cloning into '/var/lib/mock/f41-build-811115-147145/root/chroot_tmpdir/scmroot/rust-uu_nl'...
$ git fetch origin ec0bbe159992db8e149b4af7362a0c491a7f1e1e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-uu_nl
 * [new ref]         ec0bbe159992db8e149b4af7362a0c491a7f1e1e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ec0bbe1 Rebuild with Rust 1.78 to fix incomplete debuginfo and backtraces