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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,11 @@ | ||
| package(default_visibility = ["//visibility:public"]) | ||
|
|
||
| exports_files([ | ||
| "posix.bzl", | ||
| ]) | ||
|
|
||
| filegroup( | ||
| name = "srcs", | ||
| srcs = glob(["**"]), | ||
| visibility = ["//visibility:public"], | ||
| ) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,7 @@ | ||
| module( | ||
| name = "rules_nixpkgs_posix", | ||
| version = "0.8.1", | ||
| ) | ||
|
|
||
| bazel_dep(name = "rules_nixpkgs_core", version = "0.8.1") | ||
| bazel_dep(name = "rules_sh", version = "0.2.0") |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,2 @@ | ||
| # only temporary for compatibility with `WORKSPACE` setup | ||
| # TODO: remove when migration to `bzlmod` is complete |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,157 @@ | ||
| load( | ||
| "@bazel_tools//tools/cpp:lib_cc_configure.bzl", | ||
| "get_cpu_value", | ||
| ) | ||
| load("@rules_nixpkgs_core//:nixpkgs.bzl", "nixpkgs_package") | ||
|
|
||
| def nixpkgs_sh_posix_config(name, packages, **kwargs): | ||
| nixpkgs_package( | ||
| name = name, | ||
| nix_file_content = """ | ||
| with import <nixpkgs> {{ config = {{}}; overlays = []; }}; | ||
| let | ||
| # `packages` might include lists, e.g. `stdenv.initialPath` is a list itself, | ||
| # so we need to flatten `packages`. | ||
| flatten = builtins.concatMap (x: if builtins.isList x then x else [x]); | ||
| env = buildEnv {{ | ||
| name = "posix-toolchain"; | ||
| paths = flatten [ {} ]; | ||
| }}; | ||
| cmd_glob = "${{env}}/bin/*"; | ||
| os = if stdenv.isDarwin then "osx" else "linux"; | ||
| in | ||
| runCommand "bazel-nixpkgs-posix-toolchain" | ||
| {{ executable = false; | ||
| # Pointless to do this on a remote machine. | ||
| preferLocalBuild = true; | ||
| allowSubstitutes = false; | ||
| }} | ||
| '' | ||
| n=$out/nixpkgs_sh_posix.bzl | ||
| mkdir -p "$(dirname "$n")" | ||
| cat >>$n <<EOF | ||
| load("@rules_sh//sh:posix.bzl", "posix", "sh_posix_toolchain") | ||
| discovered = {{ | ||
| EOF | ||
| for cmd in ${{cmd_glob}}; do | ||
| if [[ -x $cmd ]]; then | ||
| echo " '$(basename $cmd)': '$cmd'," >>$n | ||
| fi | ||
| done | ||
| cat >>$n <<EOF | ||
| }} | ||
| def create_posix_toolchain(): | ||
| sh_posix_toolchain( | ||
| name = "nixpkgs_sh_posix", | ||
| cmds = {{ | ||
| cmd: discovered[cmd] | ||
| for cmd in posix.commands | ||
| if cmd in discovered | ||
| }} | ||
| ) | ||
| EOF | ||
| '' | ||
| """.format(" ".join(packages)), | ||
| build_file_content = """ | ||
| load("//:nixpkgs_sh_posix.bzl", "create_posix_toolchain") | ||
| create_posix_toolchain() | ||
| """, | ||
| **kwargs | ||
| ) | ||
|
|
||
| # Note [Target constraints for POSIX tools] | ||
| # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | ||
| # | ||
| # There at least three cases for POSIX tools. | ||
| # | ||
| # Case 1) The tools are used at build time in the execution platform. | ||
| # | ||
| # Case 2) The tools are used at runtime time in the target platform | ||
| # when the target platform is the same as the execution | ||
| # platform. | ||
| # | ||
| # Case 3) The tools are used at runtime time in the target platform | ||
| # when cross-compiling. | ||
| # | ||
| # At the moment, only (1) and (2) are supported by ignoring any target | ||
| # constraints when defining the toolchain. This makes available | ||
| # any tools that don't depend on the target platform like grep, find | ||
| # or sort. In case (2), the tools are still usable at runtime since | ||
| # the platforms match. | ||
| # | ||
| # POSIX tools that depend on the target platform, like cc and strip, | ||
| # are better taken from the Bazel cc toolchain instead, so they do | ||
| # match the target platform. | ||
| # | ||
| # TODO: In order to support (3), where the tools would be needed at | ||
| # runtime, nixpkgs_sh_posix_configure will need to be changed to take | ||
| # as parameter the constraints for the platform in which the tools | ||
| # should run. | ||
|
|
||
| def _nixpkgs_sh_posix_toolchain_impl(repository_ctx): | ||
| cpu = get_cpu_value(repository_ctx) | ||
| repository_ctx.file("BUILD", executable = False, content = """ | ||
| toolchain( | ||
| name = "nixpkgs_sh_posix_toolchain", | ||
| toolchain = "@{workspace}//:nixpkgs_sh_posix", | ||
| toolchain_type = "@rules_sh//sh/posix:toolchain_type", | ||
| exec_compatible_with = [ | ||
| "@platforms//cpu:x86_64", | ||
| "@platforms//os:{os}", | ||
| "@rules_nixpkgs_core//constraints:support_nix", | ||
| ], | ||
| # Leaving the target constraints empty matter for cross-compilation. | ||
| # See Note [Target constraints for POSIX tools] | ||
| target_compatible_with = [], | ||
| ) | ||
| """.format( | ||
| workspace = repository_ctx.attr.workspace, | ||
| os = {"darwin": "osx"}.get(cpu, "linux"), | ||
| )) | ||
|
|
||
| _nixpkgs_sh_posix_toolchain = repository_rule( | ||
| _nixpkgs_sh_posix_toolchain_impl, | ||
| attrs = { | ||
| "workspace": attr.string(), | ||
| }, | ||
| ) | ||
|
|
||
| def nixpkgs_sh_posix_configure( | ||
| name = "nixpkgs_sh_posix_config", | ||
| packages = ["stdenv.initialPath"], | ||
| **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. | ||
| Args: | ||
| name: Name prefix for the generated repositories. | ||
| packages: List of Nix attribute paths to draw Unix tools from. | ||
| nix_file_deps: See nixpkgs_package. | ||
| repositories: See nixpkgs_package. | ||
| repository: See nixpkgs_package. | ||
| nixopts: See nixpkgs_package. | ||
| fail_not_supported: See nixpkgs_package. | ||
| """ | ||
| nixpkgs_sh_posix_config( | ||
| name = name, | ||
| packages = packages, | ||
| **kwargs | ||
| ) | ||
|
|
||
| # The indirection is required to avoid errors when `nix-build` is not in `PATH`. | ||
| _nixpkgs_sh_posix_toolchain( | ||
| name = name + "_toolchain", | ||
| workspace = name, | ||
| ) | ||
| native.register_toolchains( | ||
| "@{}//:nixpkgs_sh_posix_toolchain".format(name + "_toolchain"), | ||
| ) |