nix copy - copy paths between Nix stores

       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.

       •  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 all store paths from a local binary cache in /tmp/cache to the local store:

       # nix copy --all --from file:///tmp/cache

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

       # nix copy --substitute-on-destination --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

       nix copy - copy paths between Nix stores

       •  --from store-uri

          URL of the source Nix store.

       •  --no-check-sigs

          Do not require that paths are signed by trusted keys.

       •  --stdin

          Read installables from the standard input. No default installable applied.

       •  --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.

   Commonevaluationoptions
       •  --arg nameexpr

          Pass the value expr as the argument name to Nix functions.

       •  --arg-from-file namepath

          Pass the contents of file path as the argument name to Nix functions.

       •  --arg-from-stdin name

          Pass the contents of stdin as the argument name to Nix functions.

       •  --argstr namestring

          Pass the string string as the argument name to Nix functions.

       •  --debugger

          Start an interactive environment if evaluation fails.

       •  --eval-store store-url

          The URL of the Nix store to use for evaluation, i.e. to store  derivations  (.drv  files)  and  inputs
          referenced by them.

       •  --impure

          Allow access to mutable paths and repositories.

       •  --include / -I path

          Add path to search path entries used to resolve lookup paths

          This option may be given multiple times.

          Paths  added  through  -I  take  precedence  over  the nix-path configuration setting and the NIX_PATH
          environment variable.

       •  --override-flake original-refresolved-ref

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

   Commonflake-relatedoptions
       •  --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.

                 DEPRECATED

                 Use --no-use-registries instead.

       •  --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.

       •  --output-lock-file flake-lock-path

          Write the given lock file instead of flake.lock within the top-level flake.

       •  --override-input input-pathflake-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.

                 DEPRECATED

                 Use nix flake update instead.

       •  --reference-lock-file flake-lock-path

          Read the given lock file instead of flake.lock within the top-level flake.

       •  --update-input input-path

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

                 DEPRECATED

                 Use nix flake update instead.

   Logging-relatedoptions
       •  --debug

          Set the logging verbosity level to ‘debug’.

       •  --log-format format

          Set the format of log output; one of raw, internal-json, bar or bar-with-logs.

       •  --print-build-logs / -L

          Print full build logs on standard error.

       •  --quiet

          Decrease the logging verbosity level.

       •  --verbose / -v

          Increase the logging verbosity level.

   Miscellaneousglobaloptions
       •  --help

          Show usage information.

       •  --offline

          Disable substituters and consider all previously downloaded files up-to-date.

       •  --option namevalue

          Set the Nix configuration setting name to value (overriding nix.conf).

       •  --refresh

          Consider all previously downloaded files out-of-date.

       •  --repair

          During evaluation, rewrite missing or corrupted files in  the  Nix  store.  During  building,  rebuild
          missing or corrupted store paths.

       •  --version

          Show version information.

   Optionsthatchangetheinterpretationofinstallables
       •  --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. Implies --impure.

       •  --no-recursive

          Apply operation to specified paths only.

          Note

          See man nix.conf for overriding configuration settings with command line flags.

                                                                                                    nix3-copy(1)

       nix copy [option…] installables…