Name

       nix copy - copy paths between Nix stores

Synopsis

       nix copy [option…] installables…

Examples

       • Copy Firefox from the local store to a binary cache in /tmp/cache:

       # nix copy --to file:///tmp/cache $(type -p firefox)

              Note  the  file://  - without this, the destination is a chroot store, not a binary
              cache.

       • Copy the entire current NixOS system closure to another machine via SSH:

       # nix copy -s --to ssh://server /run/current-system

              The -s flag causes the remote machine to try to  substitute  missing  store  paths,
              which  may  be  faster  if the link between the local and remote machines is slower
              than  the  link  between  the   remote   machine   and   its   substituters   (e.g.
              https://cache.nixos.org).

       • Copy a closure from another machine via SSH:

       # nix copy --from ssh://server /nix/store/a6cnl93nk1wxnq84brbbwr6hxw9gp2w9-blender-2.79-rc2

       • Copy Hello to a binary cache in an Amazon S3 bucket:

       # nix copy --to s3://my-bucket?region=eu-west-1 nixpkgs#hello

              or to an S3-compatible storage system:

       # nix copy --to s3://my-bucket?region=eu-west-1&endpoint=example.com nixpkgs#hello

              Note that this only works if Nix is built with AWS support.

       • Copy a closure from /nix/store to the chroot store /tmp/nix/nix/store:

       # nix copy --to /tmp/nix nixpkgs#hello --no-check-sigs

Description

       nix  copy copies store path closures between two Nix stores. The source store is specified
       using --from and the destination using --to. If one of these is omitted,  it  defaults  to
       the local store.

Options

       • --from store-uri
         URL of the source Nix store.

       • --no-check-sigs
         Do not require that paths are signed by trusted keys.

       • --substitute-on-destination / -s
         Whether to try substitutes on the destination store (only supported by SSH stores).

       • --to store-uri
         URL of the destination Nix store.

       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.
         If file is the character -, then a Nix expression will be read from standard input.

       • --no-recursive
         Apply operation to specified paths only.

                                                                                     nix3-copy(1)