Nix System Rebuild After changing any Nix-managed config in ~/.config/dotfiles , the system must be rebuilt for changes to take effect. Nix store symlinks are read-only — you cannot edit them in place. Quick Rebuild cd ~/.config/dotfiles sudo darwin-rebuild switch --flake . darwin-rebuild has a NOPASSWD sudoers rule, so this works non-interactively. Using hey The hey command wraps rebuilds: hey rebuild

or: hey re

hey test

build + activate without boot entry

hey rollback

roll back to previous generation

When to Rebuild After editing any .nix file After editing config files symlinked through home-manager (lazygit, ghostty, etc.) When you see "permission denied" writing to a Nix store path Workflow Edit source config in ~/.config/dotfiles/ Commit changes Run sudo darwin-rebuild switch --flake ~/.config/dotfiles Verify the symlink now points to updated Nix store path