TODO

• it's weird that manifest is .meta but project is dict

m.sources["rnix-lsp"].meta["cargoSha256"] = sha
p.specs["rnix-lsp"]["meta"]["cargoSha256"] = sha

• derivation name? parallel download?
• change update script from update.jl to nix-update.jl
• run_supress: replace out=true with out=String for type to parse output
• nix-prefetch --check-store? Only when downloading?
• TODO(urgent) naming for sources? parallel build?