Name

       nix store make-content-addressable - rewrite a path or closure to content-addressed form

Synopsis

       nix store make-content-addressable [option…] installables…

Examples

       • Create a content-addressed representation of the closure of GNU Hello:

       # nix store make-content-addressable -r nixpkgs#hello
       …
       rewrote '/nix/store/v5sv61sszx301i0x6xysaqzla09nksnd-hello-2.10' to '/nix/store/5skmmcb9svys5lj3kbsrjg7vf2irid63-hello-2.10'

              Since the resulting paths are content-addressed, they are always trusted and don’t need signatures
              to copied to another store:

       # nix copy --to /tmp/nix --trusted-public-keys '' /nix/store/5skmmcb9svys5lj3kbsrjg7vf2irid63-hello-2.10

              By contrast, the original closure is input-addressed, so it does need signatures to be trusted:

       # nix copy --to /tmp/nix --trusted-public-keys '' nixpkgs#hello
       cannot add path '/nix/store/zy9wbxwcygrwnh8n2w9qbbcr6zk87m26-libunistring-0.9.10' because it lacks a valid signature

       • Create a content-addressed representation of the current NixOS system closure:

       # nix store make-content-addressable -r /run/current-system

Description

       This command converts the closure of the store paths specified by installables to content-addressed form.
       Nix  store  paths  are  usually input-addressed, meaning that the hash part of the store path is computed
       from the contents of the derivation (i.e., the build-time dependency graph). Input-addressed  paths  need
       to  be signed by a trusted key if you want to import them into a store, because we need to trust that the
       contents of the path were actually built by the derivation.

       By contrast, in a content-addressed path, the hash part is computed from the contents of the  path.  This
       allows  the  contents  of  the path to be verified without any additional information such as signatures.
       This means that a command like

       # nix store build /nix/store/5skmmcb9svys5lj3kbsrjg7vf2irid63-hello-2.10 \
           --substituters https://my-cache.example.org

       will succeed even if the binary cache https://my-cache.example.org doesn’t present any signatures.

Options

       • --json
         Produce output in JSON format, suitable for consumption by another program.

       Common evaluation options:

       • --arg name expr
         Pass the value expr as the argument name to Nix functions.

       • --argstr name string
         Pass the string string as the argument name to Nix functions.

       • --eval-store store-url
         The Nix store to use for evaluations.

       • --impure
         Allow access to mutable paths and repositories.

       • --include / -I path
         Add path to the list of locations used to look up <...> file names.

       • --override-flake original-ref resolved-ref
         Override the flake registries, redirecting original-ref to resolved-ref.

       Common flake-related options:

       • --commit-lock-file
         Commit changes to the flake’s lock file.

       • --inputs-from flake-url
         Use the inputs of the specified flake as registry entries.

       • --no-registries
         Don’t allow lookups in the flake registries. This option is deprecated; use --no-use-registries.

       • --no-update-lock-file
         Do not allow any updates to the flake’s lock file.

       • --no-write-lock-file
         Do not write the flake’s newly generated lock file.

       • --override-input input-path flake-url
         Override a specific flake input (e.g. dwarffs/nixpkgs). This implies --no-write-lock-file.

       • --recreate-lock-file
         Recreate the flake’s lock file from scratch.

       • --update-input input-path
         Update a specific flake input (ignoring its previous entry in the lock file).

       Options that change the interpretation of installables:

       • --all
         Apply the operation to every store path.

       • --derivation
         Operate on the store derivation rather than its outputs.

       • --expr expr
         Interpret installables as attribute paths relative to the Nix expression expr.

       • --file / -f file
         Interpret installables as attribute paths relative to the Nix expression stored in file.

       • --recursive / -r
         Apply operation to closure of the specified paths.

                                                                          nix3-store-make-content-addressable(1)