$ git clone -n https://src.fedoraproject.org/rpms/rust-nu-std.git /var/lib/mock/f42-build-3264065-41244/root/chroot_tmpdir/scmroot/rust-nu-std
Cloning into '/var/lib/mock/f42-build-3264065-41244/root/chroot_tmpdir/scmroot/rust-nu-std'...
$ git fetch origin bfa8ac9a69c1fcab8ae808537d55534a6b9de44f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-nu-std
 * [new ref]         bfa8ac9a69c1fcab8ae808537d55534a6b9de44f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bfa8ac9 Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild