nix store optimise

Replace identical files in the store by hard links.

Warning

This program is experimental and its interface is subject to change.

Synopsis

nix store optimise [option...]

Examples

• Optimise the Nix store:

nix store optimise

Description

This command deduplicates the Nix store: it scans the store for regular files with identical contents, and replaces them with hard links to a single instance.

Note that you can also set auto-optimise-store to true in nix.conf to perform this optimisation incrementally whenever a new path is added to the Nix store. To make this efficient, Lix maintains a content-addressed index of all the files in the Nix store in the directory /nix/store/.links/.