Nixpkgs rules for Bazel

Use Nix and the Nixpkgs package set to import external dependencies (like system packages) into Bazel hermetically. If the version of any dependency changes, Bazel will correctly rebuild targets, and only those targets that use the external dependencies that changed.

Links:

Nix + Bazel = fully reproducible, incremental builds (blog post)
Nix + Bazel (lightning talk)

See examples for how to use rules_nixpkgs with different toolchains.

Setup

Add the following to your WORKSPACE file, and select a $COMMIT accordingly.

load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")

http_archive(
    name = "io_tweag_rules_nixpkgs",
    strip_prefix = "rules_nixpkgs-$COMMIT",
    urls = ["https://github.com/tweag/rules_nixpkgs/archive/$COMMIT.tar.gz"],
)

load("@io_tweag_rules_nixpkgs//nixpkgs:repositories.bzl", "rules_nixpkgs_dependencies")
rules_nixpkgs_dependencies()

load("@io_tweag_rules_nixpkgs//nixpkgs:nixpkgs.bzl", "nixpkgs_git_repository", "nixpkgs_package", "nixpkgs_cc_configure")

load("@io_tweag_rules_nixpkgs//nixpkgs:toolchains/go.bzl", "nixpkgs_go_configure") # optional

If you use rules_nixpkgs to configure a toolchain, then you will also need to configure the build platform to include the @rules_nixpkgs_core//constraints:support_nix constraint. For example by adding the following to .bazelrc:

build --host_platform=@rules_nixpkgs_core//platforms:host

Example

nixpkgs_git_repository(
    name = "nixpkgs",
    revision = "17.09", # Any tag or commit hash
    sha256 = "" # optional sha to verify package integrity!
)

nixpkgs_package(
    name = "hello",
    repositories = { "nixpkgs": "@nixpkgs//:default.nix" }
)

Migration from older releases

`path` Attribute (removed in 0.3)

path was an attribute from the early days of rules_nixpkgs, and its ability to reference arbitrary paths is a danger to build hermeticity.

Replace it with either nixpkgs_git_repository if you need a specific version of nixpkgs. If you absolutely must depend on a local folder, use Bazel's local_repository workspace rule. Both approaches work well with the repositories attribute of nixpkgs_package.

local_repository(
  name = "local-nixpkgs",
  path = "/path/to/nixpkgs",
)

nixpkgs_package(
  name = "somepackage",
  repositories = {
    "nixpkgs": "@local-nixpkgs//:default.nix",
  },
)

Reference documentation

nixpkgs_cc_configure

nixpkgs_cc_configure(name, attribute_path, nix_file, nix_file_content, nix_file_deps, repositories,
                     repository, nixopts, quiet, fail_not_supported, exec_constraints,
                     target_constraints, register, cc_lang, cc_std, cross_cpu)

Use a CC toolchain from Nixpkgs. No-op if not a nix-based platform.

By default, Bazel auto-configures a CC toolchain from commands (e.g. gcc) available in the environment. To make builds more hermetic, use this rule to specify explicitly which commands the toolchain should use.

Specifically, it builds a Nix derivation that provides the CC toolchain tools in the bin/ path and constructs a CC toolchain that uses those tools. Tools that aren't found are replaced by ${coreutils}/bin/false. You can inspect the resulting @<name>_info//:CC_TOOLCHAIN_INFO to see which tools were discovered.

If you specify the nix_file or nix_file_content argument, the CC toolchain is discovered by evaluating the corresponding expression. In addition, you may use the attribute_path argument to select an attribute from the result of the expression to use as the CC toolchain (see example below).

If neither the nix_file nor nix_file_content argument is used, the toolchain is discovered from the stdenv.cc and the stdenv.cc.bintools attributes of the given <nixpkgs> repository.

# use GCC 11
nixpkgs_cc_configure(
  repository = "@nixpkgs",
  nix_file_content = "(import <nixpkgs> {}).gcc11",
)

# use GCC 11 (same result as above)
nixpkgs_cc_configure(
  repository = "@nixpkgs",
  attribute_path = "gcc11",
  nix_file_content = "import <nixpkgs> {}",
)

# alternate usage without specifying `nix_file` or `nix_file_content`
nixpkgs_cc_configure(
  repository = "@nixpkgs",
  attribute_path = "gcc11",
)

# use the `stdenv.cc` compiler (the default of the given @nixpkgs repository)
nixpkgs_cc_configure(
  repository = "@nixpkgs",
)

This rule depends on rules_cc.

Note: You need to configure --crosstool_top=@<name>//:toolchain to activate this toolchain.

Parameters

`name`	optional. default is `"local_config_cc"`
`attribute_path`	optional. default is `""` optional, string, Obtain the toolchain from the Nix expression under this attribute path. Uses default repository if no `nix_file` or `nix_file_content` is provided.
`nix_file`	optional. default is `None` optional, Label, Obtain the toolchain from the Nix expression defined in this file. Specify only one of `nix_file` or `nix_file_content`.
`nix_file_content`	optional. default is `""` optional, string, Obtain the toolchain from the given Nix expression. Specify only one of `nix_file` or `nix_file_content`.
`nix_file_deps`	optional. default is `[]` optional, list of Label, Additional files that the Nix expression depends on.
`repositories`	optional. default is `{}` dict of Label to string, Provides `<nixpkgs>` and other repositories. Specify one of `repositories` or `repository`.
`repository`	optional. default is `None` Label, Provides `<nixpkgs>`. Specify one of `repositories` or `repository`.
`nixopts`	optional. default is `[]` optional, list of string, Extra flags to pass when calling Nix. See `nixopts` attribute to `nixpkgs_package` for further details.
`quiet`	optional. default is `False` bool, Whether to hide `nix-build` output.
`fail_not_supported`	optional. default is `True` bool, Whether to fail if `nix-build` is not available.
`exec_constraints`	optional. default is `None` Constraints for the execution platform.
`target_constraints`	optional. default is `None` Constraints for the target platform.
`register`	optional. default is `True` bool, enabled by default, Whether to register (with `register_toolchains`) the generated toolchain and install it as the default cc_toolchain.
`cc_lang`	optional. default is `"c++"` string, `"c++"` by default. Used to populate `CXX_FLAG` so the compiler is called in C++ mode. Can be set to `"none"` together with appropriate `copts` in the `cc_library` call: see above.
`cc_std`	optional. default is `"c++0x"` string, `"c++0x"` by default. Used to populate `CXX_FLAG` so the compiler uses the given language standard. Can be set to `"none"` together with appropriate `copts` in the `cc_library` call: see above.
`cross_cpu`	optional. default is `""` string, `""` by default. Used if you want to add a cross compilation C/C++ toolchain. Set this to the CPU architecture for the target CPU. For example x86_64, would be k8.

nixpkgs_cc_configure_deprecated

nixpkgs_cc_configure_deprecated(repository, repositories, nix_file, nix_file_deps, nix_file_content,
                                nixopts)

Use a CC toolchain from Nixpkgs. No-op if not a nix-based platform.

Tells Bazel to use compilers and linkers from Nixpkgs for the CC toolchain. By default, Bazel auto-configures a CC toolchain from commands available in the environment (e.g. gcc). Overriding this autodetection makes builds more hermetic and is considered a best practice.

Example

nixpkgs_cc_configure(repository = "@nixpkgs//:default.nix")

Parameters

`repository`	optional. default is `None` A repository label identifying which Nixpkgs to use. Equivalent to `repositories = { "nixpkgs": ...}`.
`repositories`	optional. default is `{}` A dictionary mapping `NIX_PATH` entries to repository labels. Setting it to `repositories = { "myrepo" : "//:myrepo" }` for example would replace all instances of `<myrepo>` in the called nix code by the path to the target `"//:myrepo"`. See the relevant section in the nix manual for more information. Specify one of `repository` or `repositories`.
`nix_file`	optional. default is `None` An expression for a Nix environment derivation. The environment should expose all the commands that make up a CC toolchain (`cc`, `ld` etc). Exposes all commands in `stdenv.cc` and `binutils` by default.
`nix_file_deps`	optional. default is `None` Dependencies of `nix_file` if any.
`nix_file_content`	optional. default is `None` An expression for a Nix environment derivation.
`nixopts`	optional. default is `[]` Options to forward to the nix command.

nixpkgs_flake_package

nixpkgs_flake_package(name, nix_flake_file, nix_flake_lock_file, nix_flake_file_deps, package,
                      build_file, build_file_content, nixopts, quiet, fail_not_supported,
                      legacy_path_syntax, kwargs)

Make the content of a local Nix Flake package available in the Bazel workspace.

IMPORTANT NOTE: Calling nix build copies the entirety of the Nix Flake into the Nix Store. When using the path: syntax, this means the directory containing flake.nix and any subdirectories. Without specifying path: Nix may infer that the flake is the Git repository and copy the entire thing. As a consequence, you may want to isolate your flake from the rest of the repository to minimize the amount of unnecessary data that gets copied into the Nix Store whenever the flake is rebuilt.

Parameters

`name`	required. A unique name for this repository.
`nix_flake_file`	required. Label to `flake.nix` that will be evaluated.
`nix_flake_lock_file`	required. Label to `flake.lock` that corresponds to `nix_flake_file`.
`nix_flake_file_deps`	optional. default is `[]` Additional dependencies of `nix_flake_file` if any.
`package`	optional. default is `None` Nix Flake package to make available. The default package will be used if not specified.
`build_file`	optional. default is `None` The file to use as the BUILD file for this repository. See `nixpkgs_package` for more information.
`build_file_content`	optional. default is `""` Like `build_file`, but a string of the contents instead of a file name. See `nixpkgs_package` for more information.
`nixopts`	optional. default is `[]` Extra flags to pass when calling Nix. See `nixpkgs_package` for more information.
`quiet`	optional. default is `False` Whether to hide the output of the Nix command.
`fail_not_supported`	optional. default is `True` If set to `True` (default) this rule will fail on platforms which do not support Nix (e.g. Windows). If set to `False` calling this rule will succeed but no output will be generated.
`legacy_path_syntax`	optional. default is `False` If set to True (not default), the Nix Flake invocation will directly call `nix build <path>` instead of `nix build path:<path>` which may involve copying the entirety of the Git repo into the Nix Store instead of just the path and its children.
`kwargs`	optional. Common rule arguments.

nixpkgs_git_repository

nixpkgs_git_repository(name, revision, remote, sha256, kwargs)

Name a specific revision of Nixpkgs on GitHub or a local checkout.

Parameters

`name`	required. String A unique name for this repository.
`revision`	required. String Git commit hash or tag identifying the version of Nixpkgs to use.
`remote`	optional. default is `"https://github.com/NixOS/nixpkgs"` String The URI of the remote Git repository. This must be a HTTP URL. There is currently no support for authentication. Defaults to upstream nixpkgs.
`sha256`	optional. default is `None` String The SHA256 used to verify the integrity of the repository.
`kwargs`	optional. Additional arguments to forward to the underlying repository rule.

nixpkgs_http_repository

nixpkgs_http_repository(name, url, urls, auth, strip_prefix, integrity, sha256, kwargs)

Download a Nixpkgs repository over HTTP.

Parameters

`name`	required. String A unique name for this repository.
`url`	optional. default is `None` String A URL to download the repository from. This must be a file, http or https URL. Redirections are followed. More flexibility can be achieved by the urls parameter that allows to specify alternative URLs to fetch from.
`urls`	optional. default is `None` List of String A list of URLs to download the repository from. Each entry must be a file, http or https URL. Redirections are followed. URLs are tried in order until one succeeds, so you should list local mirrors first. If all downloads fail, the rule will fail.
`auth`	optional. default is `None` Dict of String An optional dict mapping host names to custom authorization patterns. If a URL's host name is present in this dict the value will be used as a pattern when generating the authorization header for the http request. This enables the use of custom authorization schemes used in a lot of common cloud storage providers. The pattern currently supports 2 tokens: `<login>` and `<password>`, which are replaced with their equivalent value in the netrc file for the same host name. After formatting, the result is set as the value for the `Authorization` field of the HTTP request. Example attribute and netrc for a http download to an oauth2 enabled API using a bearer token: auth_patterns = { "storage.cloudprovider.com": "Bearer <password>" } netrc: machine storage.cloudprovider.com password RANDOM-TOKEN The final HTTP request would have the following header: Authorization: Bearer RANDOM-TOKEN
`strip_prefix`	optional. default is `None` String A directory prefix to strip from the extracted files. Many archives contain a top-level directory that contains all of the useful files in archive. This field can be used to strip it from all of the extracted files. For example, suppose you are using `nixpkgs-22.11.zip`, which contains the directory `nixpkgs-22.11/` under which there is the `default.nix` file and the `pkgs/` directory. Specify `strip_prefix = "nixpkgs-22.11"` to use the `nixpkgs-22.11` directory as your top-level directory. Note that if there are files outside of this directory, they will be discarded and inaccessible (e.g., a top-level license file). This includes files/directories that start with the prefix but are not in the directory (e.g., `nixpkgs-22.11.release-notes`). If the specified prefix does not match a directory in the archive, Bazel will return an error.
`integrity`	optional. default is `None` String Expected checksum in Subresource Integrity format of the file downloaded. This must match the checksum of the file downloaded. It is a security risk to omit the checksum as remote files can change. At best omitting this field will make your build non-hermetic. It is optional to make development easier but either this attribute or `sha256` should be set before shipping.
`sha256`	optional. default is `None` String The expected SHA-256 of the file downloaded. This must match the SHA-256 of the file downloaded. It is a security risk to omit the SHA-256 as remote files can change. At best omitting this field will make your build non-hermetic. It is optional to make development easier but should be set before shipping.
`kwargs`	optional. Additional arguments to forward to the underlying repository rule.

nixpkgs_java_configure

nixpkgs_java_configure(name, attribute_path, java_home_path, repository, repositories, nix_file,
                       nix_file_content, nix_file_deps, nixopts, fail_not_supported, quiet, toolchain,
                       register, toolchain_name, toolchain_version, exec_constraints,
                       target_constraints)

Define a Java runtime provided by nixpkgs.

Creates a nixpkgs_package for a java_runtime instance. Optionally, you can also create & register a Java toolchain. This only works with Bazel >= 5.0 Bazel can use this instance to run JVM binaries and tests, refer to the Bazel documentation for details.

Example

Bazel 4

Add the following to your WORKSPACE file to import a JDK from nixpkgs:

load("@io_tweag_rules_nixpkgs//nixpkgs:nixpkgs.bzl", "nixpkgs_java_configure")
nixpkgs_java_configure(
    attribute_path = "jdk11.home",
    repository = "@nixpkgs",
)

Add the following configuration to .bazelrc to enable this Java runtime:

build --javabase=@nixpkgs_java_runtime//:runtime
build --host_javabase=@nixpkgs_java_runtime//:runtime
# Adjust this to match the Java version provided by this runtime.
# See `bazel query 'kind(java_toolchain, @bazel_tools//tools/jdk:all)'` for available options.
build --java_toolchain=@bazel_tools//tools/jdk:toolchain_java11
build --host_java_toolchain=@bazel_tools//tools/jdk:toolchain_java11

Bazel 5

Add the following to your WORKSPACE file to import a JDK from nixpkgs:

load("@io_tweag_rules_nixpkgs//nixpkgs:nixpkgs.bzl", "nixpkgs_java_configure")
nixpkgs_java_configure(
    attribute_path = "jdk11.home",
    repository = "@nixpkgs",
    toolchain = True,
    toolchain_name = "nixpkgs_java",
    toolchain_version = "11",
)

Add the following configuration to .bazelrc to enable this Java runtime:

build --host_platform=@io_tweag_rules_nixpkgs//nixpkgs/platforms:host
build --java_runtime_version=nixpkgs_java
build --tool_java_runtime_version=nixpkgs_java

Bazel 6

with with Bzlmod

Add the following to your MODULE.bazel file to depend on rules_nixpkgs, rules_nixpkgs_java, and nixpgks:

bazel_dep(name = "rules_nixpkgs_core", version = "0.12.0")
bazel_dep(name = "rules_nixpkgs_java", version = "0.12.0")
bazel_dep(name = "rules_java", version = "7.3.1")
bazel_dep(name = "platforms", version = "0.0.9")

nix_repo = use_extension("@rules_nixpkgs_core//extensions:repository.bzl", "nix_repo")
nix_repo.github(
    name = "nixpkgs",
    org = "NixOS",
    repo = "nixpkgs",
    commit = "ff0dbd94265ac470dda06a657d5fe49de93b4599",
    sha256 = "1bf0f88ee9181dd993a38d73cb120d0435e8411ea9e95b58475d4426c0948e98",
)
use_repo(nix_repo, "nixpkgs")

non_module_dependencies = use_extension("//:non_module_dependencies.bzl", "non_module_dependencies")
use_repo(non_module_dependencies, "nixpkgs_java_runtime_toolchain")

register_toolchains("@nixpkgs_java_runtime_toolchain//:all")

archive_override(
    module_name = "rules_nixpkgs_java",
    urls = "https://github.com/tweag/rules_nixpkgs/releases/download/v0.12.0/rules_nixpkgs-0.12.0.tar.gz",
    integrity = "",
    strip_prefix = "rules_nixpkgs-0.12.0/toolchains/java",
)

Add the following to a .bzl file, like non_module_dependencies.bzl, to import a JDK from nixpkgs:

load("@rules_nixpkgs_java//:java.bzl", "nixpkgs_java_configure")

def _non_module_dependencies_impl(_ctx):
    nixpkgs_java_configure(
        name = "nixpkgs_java_runtime",
        attribute_path = "openjdk19.home",
        repository = "@nixpkgs",
        toolchain = True,
        toolchain_name = "nixpkgs_java",
        toolchain_version = "19",
        register = False,
    )

non_module_dependencies = module_extension(
    implementation = _non_module_dependencies_impl,
)

Add the following configuration to .bazelrc to enable this Java runtime:

common --enable_bzlmod
build --host_platform=@rules_nixpkgs_core//platforms:host
build --java_runtime_version=nixpkgs_java_19
build --tool_java_runtime_version=nixpkgs_java_19
build --java_language_version=19
build --tool_java_language_version=19

with `WORKSPACE`

Add the following to your WORKSPACE file to import a JDK from nixpkgs:

load("@io_tweag_rules_nixpkgs//nixpkgs:nixpkgs.bzl", "nixpkgs_java_configure")
nixpkgs_java_configure(
    attribute_path = "jdk11.home",
    repository = "@nixpkgs",
    toolchain = True,
    toolchain_name = "nixpkgs_java",
    toolchain_version = "11",
)

Add the following configuration to .bazelrc to enable this Java runtime:

build --host_platform=@io_tweag_rules_nixpkgs//nixpkgs/platforms:host
build --java_runtime_version=nixpkgs_java_11
build --tool_java_runtime_version=nixpkgs_java_11
build --java_language_version=11
build --tool_java_language_version=11

Bazel 7 with Bzlmod

Add the following to your MODULE.bazel file to depend on rules_nixpkgs, rules_nixpkgs_java, and nixpgks:

bazel_dep(name = "rules_nixpkgs_core", version = "0.12.0")
bazel_dep(name = "rules_nixpkgs_java", version = "0.12.0")
bazel_dep(name = "rules_java", version = "7.5.0")
bazel_dep(name = "platforms", version = "0.0.9")

nix_repo = use_extension("@rules_nixpkgs_core//extensions:repository.bzl", "nix_repo")
nix_repo.github(
    name = "nixpkgs",
    org = "NixOS",
    repo = "nixpkgs",
    commit = "ff0dbd94265ac470dda06a657d5fe49de93b4599",
    sha256 = "1bf0f88ee9181dd993a38d73cb120d0435e8411ea9e95b58475d4426c0948e98",
)
use_repo(nix_repo, "nixpkgs")

non_module_dependencies = use_extension("//:non_module_dependencies.bzl", "non_module_dependencies")
use_repo(non_module_dependencies, "nixpkgs_java_runtime_toolchain")

register_toolchains("@nixpkgs_java_runtime_toolchain//:all")

archive_override(
    module_name = "rules_nixpkgs_java",
    urls = "https://github.com/tweag/rules_nixpkgs/releases/download/v0.12.0/rules_nixpkgs-0.12.0.tar.gz",
    integrity = "",
    strip_prefix = "rules_nixpkgs-0.12.0/toolchains/java",
)

Add the following to a .bzl file, like non_module_dependencies.bzl, to import a JDK from nixpkgs:

load("@rules_nixpkgs_java//:java.bzl", "nixpkgs_java_configure")

def _non_module_dependencies_impl(_ctx):
    nixpkgs_java_configure(
        name = "nixpkgs_java_runtime",
        attribute_path = "openjdk19.home",
        repository = "@nixpkgs",
        toolchain = True,
        toolchain_name = "nixpkgs_java",
        toolchain_version = "19",
        register = False,
    )

non_module_dependencies = module_extension(
    implementation = _non_module_dependencies_impl,
)

Add the following configuration to .bazelrc to enable this Java runtime:

build --host_platform=@rules_nixpkgs_core//platforms:host
build --java_runtime_version=nixpkgs_java_19
build --tool_java_runtime_version=nixpkgs_java_19
build --java_language_version=19
build --tool_java_language_version=19
build --extra_toolchains=@nixpkgs_java_runtime_toolchain//:all # necessary on NixOS only

Parameters

`name`	optional. default is `"nixpkgs_java_runtime"` The name-prefix for the created external repositories.
`attribute_path`	optional. default is `None` string, The nixpkgs attribute path for `jdk.home`.
`java_home_path`	optional. default is `""` optional, string, The path to `JAVA_HOME` within the package.
`repository`	optional. default is `None` See `nixpkgs_package`.
`repositories`	optional. default is `{}` See `nixpkgs_package`.
`nix_file`	optional. default is `None` optional, Label, Obtain the runtime from the Nix expression defined in this file. Specify only one of `nix_file` or `nix_file_content`.
`nix_file_content`	optional. default is `""` optional, string, Obtain the runtime from the given Nix expression. Specify only one of `nix_file` or `nix_file_content`.
`nix_file_deps`	optional. default is `None` See `nixpkgs_package`.
`nixopts`	optional. default is `[]` See `nixpkgs_package`.
`fail_not_supported`	optional. default is `True` See `nixpkgs_package`.
`quiet`	optional. default is `False` See `nixpkgs_package`.
`toolchain`	optional. default is `False` Create a Bazel toolchain based on the Java runtime.
`register`	optional. default is `None` Register the created toolchain. Requires `toolchain` to be `True`. Defaults to the value of `toolchain`.
`toolchain_name`	optional. default is `None` The name of the toolchain that can be used in --java_runtime_version.
`toolchain_version`	optional. default is `None` The version of the toolchain that can be used in --java_runtime_version.
`exec_constraints`	optional. default is `None` Constraints for the execution platform.
`target_constraints`	optional. default is `None` Constraints for the target platform.

nixpkgs_local_repository

nixpkgs_local_repository(name, nix_file, nix_file_deps, nix_file_content, nix_flake_lock_file,
                         kwargs)

Create an external repository representing the content of Nixpkgs.

Based on a Nix expression stored locally or provided inline. One of nix_file or nix_file_content must be provided.

Parameters

`name`	required. String A unique name for this repository.
`nix_file`	optional. default is `None` Label A file containing an expression for a Nix derivation.
`nix_file_deps`	optional. default is `None` List of labels Dependencies of `nix_file` if any.
`nix_file_content`	optional. default is `None` String An expression for a Nix derivation.
`nix_flake_lock_file`	optional. default is `None` String A flake lock file that can be used on the provided nixpkgs repository.
`kwargs`	optional. Additional arguments to forward to the underlying repository rule.

nixpkgs_nodejs_configure

nixpkgs_nodejs_configure(name, attribute_path, repository, repositories, nix_platform, nix_file,
                         nix_file_content, nix_file_deps, nixopts, fail_not_supported, quiet,
                         exec_constraints, target_constraints, register)

Parameters

`name`	optional. default is `"nixpkgs_nodejs"`
`attribute_path`	optional. default is `"nodejs"`
`repository`	optional. default is `None`
`repositories`	optional. default is `{}`
`nix_platform`	optional. default is `None`
`nix_file`	optional. default is `None`
`nix_file_content`	optional. default is `None`
`nix_file_deps`	optional. default is `None`
`nixopts`	optional. default is `[]`
`fail_not_supported`	optional. default is `True`
`quiet`	optional. default is `False`
`exec_constraints`	optional. default is `None`
`target_constraints`	optional. default is `None`
`register`	optional. default is `True`

nixpkgs_nodejs_configure_platforms

nixpkgs_nodejs_configure_platforms(name, platforms_mapping, attribute_path, repository,
                                   repositories, nix_platform, nix_file, nix_file_content,
                                   nix_file_deps, nixopts, fail_not_supported, quiet,
                                   exec_constraints, target_constraints, register, kwargs)

Runs nixpkgs_nodejs_configure for each platform.

Since rules_nodejs adds platform suffix to repository name, this can be helpful if one wants to use npm_install and reference js dependencies from npm repo. See the example directory.

Parameters

`name`	optional. default is `"nixpkgs_nodejs"`
`platforms_mapping`	optional. default is {"aarch64-darwin": struct(exec_constraints = ["@platforms//os:macos", "@platforms//cpu:arm64"], rules_nodejs_platform = "darwin_arm64", target_constraints = ["@platforms//os:macos", "@platforms//cpu:arm64"]), "x86_64-linux": struct(exec_constraints = ["@platforms//os:linux", "@platforms//cpu:x86_64"], rules_nodejs_platform = "linux_amd64", target_constraints = ["@platforms//os:linux", "@platforms//cpu:x86_64"]), "x86_64-darwin": struct(exec_constraints = ["@platforms//os:macos", "@platforms//cpu:x86_64"], rules_nodejs_platform = "darwin_amd64", target_constraints = ["@platforms//os:macos", "@platforms//cpu:x86_64"]), "aarch64-linux": struct(exec_constraints = ["@platforms//os:linux", "@platforms//cpu:arm64"], rules_nodejs_platform = "linux_arm64", target_constraints = ["@platforms//os:linux", "@platforms//cpu:arm64"])} struct describing mapping between nix platform and rules_nodejs bazel platform with target and exec constraints
`attribute_path`	optional. default is `"nodejs"`
`repository`	optional. default is `None`
`repositories`	optional. default is `{}`
`nix_platform`	optional. default is `None`
`nix_file`	optional. default is `None`
`nix_file_content`	optional. default is `None`
`nix_file_deps`	optional. default is `None`
`nixopts`	optional. default is `[]`
`fail_not_supported`	optional. default is `True`
`quiet`	optional. default is `False`
`exec_constraints`	optional. default is `None`
`target_constraints`	optional. default is `None`
`register`	optional. default is `True`
`kwargs`	optional.

nixpkgs_package

nixpkgs_package(name, attribute_path, nix_file, nix_file_deps, nix_file_content, repository,
                repositories, build_file, build_file_content, nixopts, quiet, fail_not_supported,
                kwargs)

Make the content of a Nixpkgs package available in the Bazel workspace.

If repositories is not specified, you must provide a nixpkgs clone in nix_file or nix_file_content.

Parameters

`name`	required. A unique name for this repository.
`attribute_path`	optional. default is `""` Select an attribute from the top-level Nix expression being evaluated. The attribute path is a sequence of attribute names separated by dots.
`nix_file`	optional. default is `None` A file containing an expression for a Nix derivation.
`nix_file_deps`	optional. default is `[]` Dependencies of `nix_file` if any.
`nix_file_content`	optional. default is `""` An expression for a Nix derivation.
`repository`	optional. default is `None` A repository label identifying which Nixpkgs to use. Equivalent to `repositories = { "nixpkgs": ...}`
`repositories`	optional. default is `{}` A dictionary mapping `NIX_PATH` entries to repository labels. Setting it to `repositories = { "myrepo" : "//:myrepo" }` for example would replace all instances of `<myrepo>` in the called nix code by the path to the target `"//:myrepo"`. See the relevant section in the nix manual for more information. Specify one of `repository` or `repositories`.
`build_file`	optional. default is `None` The file to use as the BUILD file for this repository. Its contents are copied into the file `BUILD` in root of the nix output folder. The Label does not need to be named `BUILD`, but can be. For common use cases we provide filegroups that expose certain files as targets: `:bin` Everything in the `bin/` directory. `:lib` All `.so`, `.dylib` and `.a` files that can be found in subdirectories of `lib/`. `:include` All `.h`, `.hh`, `.hpp` and `.hxx` files that can be found in subdirectories of `include/`. If you need different files from the nix package, you can reference them like this: `package(default_visibility = [ "//visibility:public" ]) filegroup( name = "our-docs", srcs = glob(["share/doc/ourpackage/*/"]), )` See the bazel documentation of `filegroup` and `glob`.
`build_file_content`	optional. default is `""` Like `build_file`, but a string of the contents instead of a file name.
`nixopts`	optional. default is `[]` Extra flags to pass when calling Nix. Subject to location expansion, any instance of `$(location LABEL)` will be replaced by the path to the file referenced by `LABEL` relative to the workspace root. Note, labels to external workspaces will resolve to paths that contain `~` characters if the Bazel flag `--enable_bzlmod` is true. Nix does not support `~` characters in path literals at the time of writing, see #7742. Meaning, the result of location expansion may not form a valid Nix path literal. Use `./$${"$(location @for//:example)"}` to work around this limitation if you need to pass a path argument via `--arg`, or pass the resulting path as a string value using `--argstr` and combine it with an additional `--arg workspace_root ./.` argument using `workspace_root + ("/" + path_str)`.
`quiet`	optional. default is `False` Whether to hide the output of the Nix command.
`fail_not_supported`	optional. default is `True` If set to `True` (default) this rule will fail on platforms which do not support Nix (e.g. Windows). If set to `False` calling this rule will succeed but no output will be generated.
`kwargs`	optional.

nixpkgs_python_configure

nixpkgs_python_configure(name, python3_attribute_path, python3_bin_path, repository, repositories,
                         nix_file_deps, nixopts, fail_not_supported, quiet, exec_constraints,
                         target_constraints, register)

Define and register a Python toolchain provided by nixpkgs.

Creates nixpkgs_packages for Python 2 or 3 py_runtime instances and a corresponding py_runtime_pair and toolchain. The toolchain is automatically registered and uses the constraint:

"@io_tweag_rules_nixpkgs//nixpkgs/constraints:support_nix"

Parameters

`name`	optional. default is `"nixpkgs_python_toolchain"` The name-prefix for the created external repositories.
`python3_attribute_path`	optional. default is `"python3"` The nixpkgs attribute path for python3.
`python3_bin_path`	optional. default is `"bin/python"` The path to the interpreter within the package.
`repository`	optional. default is `None` See `nixpkgs_package`.
`repositories`	optional. default is `{}` See `nixpkgs_package`.
`nix_file_deps`	optional. default is `None` See `nixpkgs_package`.
`nixopts`	optional. default is `[]` See `nixpkgs_package`.
`fail_not_supported`	optional. default is `True` See `nixpkgs_package`.
`quiet`	optional. default is `False` See `nixpkgs_package`.
`exec_constraints`	optional. default is `None` Constraints for the execution platform.
`target_constraints`	optional. default is `None` Constraints for the target platform.
`register`	optional. default is `True`

nixpkgs_python_repository

nixpkgs_python_repository(name, repository, repositories, nix_file, nix_file_deps, quiet)

Define a collection of python packages based on a nix file.

The only entry point is a nix_file which should expose a pkgs and a python attributes. python is the python interpreter, and pkgs a set of python packages that will be made available to bazel.

⚠️ All the packages in pkgs are built by this rule. It is therefore not a good idea to expose something as big as pkgs.python3 as provided by nixpkgs.

This rule is instead intended to expose an ad-hoc set of packages for your project, as can be built by poetry2nix, mach-nix, dream2nix or by manually picking the python packages you need from nixpkgs.

The format is generic to support the many ways to generate such packages sets with nixpkgs. See our python tests and examples to get started.

This rule is intended to mimic as closely as possible the rules_python API. nixpkgs_python_repository should be a drop-in replacement of pip_parse. As such, it also provides a requirement function.

⚠️ Using the requirement fucntion inherits the same advantages and limitations as the one in rules_python. All the function does is create a label of the form @{nixpkgs_python_repository_name}//:{package_name}. While depending on such a label directly will work, the layout may change in the future. To be on the safe side, define and import your own requirement function if you need to play with these labels.

⚠️ Just as with rules_python, nothing is done to enforce consistency between the version of python used to generate this repository and the one configured in your toolchain, even if you use nixpkgs_python_toolchain. You should ensure they both use the same python from the same nixpkgs version.

⚠️ packages names exposed by this rule are determined by the pname attribute of the corresponding nix package. These may vary slightly from names used by rules_python. Should this be a problem, you can provide you own requirement function, for example one that lowercases its argument.

Parameters

`name`	required. The name for the created package set.
`repository`	optional. default is `None` See `nixpkgs_package`.
`repositories`	optional. default is `{}` See `nixpkgs_package`.
`nix_file`	optional. default is `None` See `nixpkgs_package`.
`nix_file_deps`	optional. default is `[]` See `nixpkgs_package`.
`quiet`	optional. default is `False` See `nixpkgs_package`.

nixpkgs_rust_configure

nixpkgs_rust_configure(name, default_edition, repository, repositories, nix_file, nix_file_deps,
                       nix_file_content, nixopts, fail_not_supported, quiet, exec_constraints,
                       target_constraints, register)

Parameters

`name`	optional. default is `"nixpkgs_rust"`
`default_edition`	optional. default is `"2018"`
`repository`	optional. default is `None`
`repositories`	optional. default is `{}`
`nix_file`	optional. default is `None`
`nix_file_deps`	optional. default is `None`
`nix_file_content`	optional. default is `None`
`nixopts`	optional. default is `[]`
`fail_not_supported`	optional. default is `True`
`quiet`	optional. default is `False`
`exec_constraints`	optional. default is `None`
`target_constraints`	optional. default is `None`
`register`	optional. default is `True`

nixpkgs_sh_posix_configure

nixpkgs_sh_posix_configure(name, packages, exec_constraints, register, kwargs)

Create a POSIX toolchain from nixpkgs.

Loads the given Nix packages, scans them for standard Unix tools, and generates a corresponding sh_posix_toolchain.

Make sure to call nixpkgs_sh_posix_configure before sh_posix_configure, if you use both. Otherwise, the local toolchain will always be chosen in favor of the nixpkgs one.

Parameters

`name`	optional. default is `"nixpkgs_sh_posix_config"` Name prefix for the generated repositories.
`packages`	optional. default is `["stdenv.initialPath"]` List of Nix attribute paths to draw Unix tools from.
`exec_constraints`	optional. default is `None` Constraints for the execution platform.
`register`	optional. default is `True` Automatically register the generated toolchain if set to True.
`kwargs`	optional.

Using Bzlmod with Bazel 6

For the core module

For the nodejs module

Using WORKSPACE

0.12.0 - 2024-07-12

Added

Changed

Fixed

Nixpkgs rules for Bazel

Rules

Setup

Example

Migration from older releases

path Attribute (removed in 0.3)

Reference documentation

nixpkgs_cc_configure

Parameters

nixpkgs_cc_configure_deprecated

Example

Parameters

nixpkgs_flake_package

Parameters

nixpkgs_git_repository

Parameters

nixpkgs_http_repository

Parameters

nixpkgs_java_configure

Example

Bazel 4

Bazel 5

Bazel 6

with with Bzlmod

with WORKSPACE

Bazel 7 with Bzlmod

Parameters

nixpkgs_local_repository

Parameters

nixpkgs_nodejs_configure

Parameters

nixpkgs_nodejs_configure_platforms

Parameters

nixpkgs_package

Parameters

nixpkgs_python_configure

Parameters

nixpkgs_python_repository

Parameters

nixpkgs_rust_configure

Parameters

nixpkgs_sh_posix_configure

Parameters

`path` Attribute (removed in 0.3)

with `WORKSPACE`