Currently, nix-index is unable to index packages inaccessible from https://cache.nixos.org. Whether they miss from there or the actual server has a different address.
As a note, nix-index does not honour substituters option of nix package manager. (But I'm not surely saying it should.)
Being able to supply an address of custom binary cache server will allow to index private packages and work in an isolated environment.
Currently, nix-index is unable to index packages inaccessible from https://cache.nixos.org. Whether they miss from there or the actual server has a different address.
As a note, nix-index does not honour
substitutersoption of nix package manager. (But I'm not surely saying it should.)Being able to supply an address of custom binary cache server will allow to index private packages and work in an isolated environment.