Nix/src/nix/verify.md

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Examples

• Verify the entire Nix store:

  # nix store verify --all
  

• Check whether each path in the closure of Firefox has at least 2 signatures:

  # nix store verify --recursive --sigs-needed 2 --no-contents $(type -p firefox)
  

• Verify a store path in the binary cache https://cache.nixos.org/:

  # nix store verify --store https://cache.nixos.org/ \
      /nix/store/v5sv61sszx301i0x6xysaqzla09nksnd-hello-2.10
  

Description

This command verifies the integrity of the store paths installables, or, if --all is given, the entire Nix store. For each path, it checks that

• its contents match the NAR hash recorded in the Nix database; and

• it is trusted, that is, it is signed by at least one trusted signing key, is content-addressed, or is built locally ("ultimately trusted").

Exit status

The exit status of this command is the sum of the following values:

• 1 if any path is corrupted (i.e. its contents don't match the recorded NAR hash).

• 2 if any path is untrusted.

• 4 if any path couldn't be verified for any other reason (such as an I/O error).

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