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nix/doc/manual/rl-next/add-nix-state-home.md

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synopsis prs
Use envvars NIX_CACHE_HOME, NIX_CONFIG_HOME, NIX_DATA_HOME, NIX_STATE_HOME if defined
11351

Added new environment variables:

  • NIX_CACHE_HOME
  • NIX_CONFIG_HOME
  • NIX_DATA_HOME
  • NIX_STATE_HOME

Each, if defined, takes precedence over the corresponding XDG environment variable. This provides more fine-grained control over where Nix looks for files, and allows to have a stand-alone Nix environment, which only uses files in a specific directory, and doesn't interfere with the user environment.