Merge pull request #11014 from obsidiansystems/plugins-libmain

Move plugins infra to `libnixmain`

meson.build

@@ -26,6 +26,7 @@ subproject('external-api-docs')
 subproject('libutil-c')
 subproject('libstore-c')
 subproject('libexpr-c')
+subproject('libmain-c')
 
 # Language Bindings
 subproject('perl')

packaging/components.nix

@@ -29,6 +29,7 @@ in
  nix-flake-tests = callPackage ../tests/unit/libflake/package.nix { };
 
  nix-main = callPackage ../src/libmain/package.nix { };
+ nix-main-c = callPackage ../src/libmain-c/package.nix { };
 
  nix-cmd = callPackage ../src/libcmd/package.nix { };
 

packaging/hydra.nix

@@ -52,6 +52,7 @@ let
  "nix-flake"
  "nix-flake-tests"
  "nix-main"
+ "nix-main-c"
  "nix-cmd"
  "nix-ng"
  ];

src/build-remote/build-remote.cc

@@ -11,6 +11,7 @@
 
 #include "machines.hh"
 #include "shared.hh"
+#include "plugin.hh"
 #include "pathlocks.hh"
 #include "globals.hh"
 #include "serialise.hh"

src/libmain-c/.version

@@ -0,0 +1 @@
+../../.version

src/libmain-c/build-utils-meson

@@ -0,0 +1 @@
+../../build-utils-meson

src/libmain-c/meson.build

@@ -0,0 +1,84 @@
+project('nix-main-c', 'cpp',
+ version : files('.version'),
+ default_options : [
+ 'cpp_std=c++2a',
+ # TODO(Qyriad): increase the warning level
+ 'warning_level=1',
+ 'debug=true',
+ 'optimization=2',
+ 'errorlogs=true', # Please print logs for tests that fail
+ ],
+ meson_version : '>= 1.1',
+ license : 'LGPL-2.1-or-later',
+)
+
+cxx = meson.get_compiler('cpp')
+
+subdir('build-utils-meson/deps-lists')
+
+configdata = configuration_data()
+
+deps_private_maybe_subproject = [
+ dependency('nix-util'),
+ dependency('nix-store'),
+ dependency('nix-main'),
+]
+deps_public_maybe_subproject = [
+ dependency('nix-util-c'),
+ dependency('nix-store-c'),
+]
+subdir('build-utils-meson/subprojects')
+
+# TODO rename, because it will conflict with downstream projects
+configdata.set_quoted('PACKAGE_VERSION', meson.project_version())
+
+config_h = configure_file(
+ configuration : configdata,
+ output : 'config-main.h',
+)
+
+add_project_arguments(
+ # TODO(Qyriad): Yes this is how the autoconf+Make system did it.
+ # It would be nice for our headers to be idempotent instead.
+
+ # From C++ libraries, only for internals
+ '-include', 'config-util.hh',
+ '-include', 'config-store.hh',
+ '-include', 'config-main.hh',
+
+ # From C libraries, for our public, installed headers too
+ '-include', 'config-util.h',
+ '-include', 'config-store.h',
+ '-include', 'config-main.h',
+ language : 'cpp',
+)
+
+subdir('build-utils-meson/diagnostics')
+
+sources = files(
+ 'nix_api_main.cc',
+)
+
+include_dirs = [include_directories('.')]
+
+headers = [config_h] + files(
+ 'nix_api_main.h',
+)
+
+subdir('build-utils-meson/export-all-symbols')
+
+this_library = library(
+ 'nixmainc',
+ sources,
+ dependencies : deps_public + deps_private + deps_other,
+ include_directories : include_dirs,
+ link_args: linker_export_flags,
+ prelink : true, # For C++ static initializers
+ install : true,
+)
+
+install_headers(headers, subdir : 'nix', preserve_path : true)
+
+libraries_private = []
+
+subdir('build-utils-meson/export')

src/libmain-c/nix_api_main.cc

@@ -0,0 +1,16 @@
+#include "nix_api_store.h"
+#include "nix_api_store_internal.h"
+#include "nix_api_util.h"
+#include "nix_api_util_internal.h"
+
+#include "plugin.hh"
+
+nix_err nix_init_plugins(nix_c_context * context)
+{
+ if (context)
+ context->last_err_code = NIX_OK;
+ try {
+ nix::initPlugins();
+ }
+ NIXC_CATCH_ERRS
+}

src/libmain-c/nix_api_main.h

@@ -0,0 +1,40 @@
+#ifndef NIX_API_MAIN_H
+#define NIX_API_MAIN_H
+/**
+ * @defgroup libmain libmain
+ * @brief C bindings for nix libmain
+ *
+ * libmain has misc utilities for CLI commands
+ * @{
+ */
+/** @file
+ * @brief Main entry for the libmain C bindings
+ */
+
+#include "nix_api_util.h"
+#include <stdbool.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+// cffi start
+
+/**
+ * @brief Loads the plugins specified in Nix's plugin-files setting.
+ *
+ * Call this once, after calling your desired init functions and setting
+ * relevant settings.
+ *
+ * @param[out] context Optional, stores error information
+ * @return NIX_OK if the initialization was successful, an error code otherwise.
+ */
+nix_err nix_init_plugins(nix_c_context * context);
+
+// cffi end
+#ifdef __cplusplus
+}
+#endif
+/**
+ * @}
+ */
+#endif // NIX_API_MAIN_H

src/libmain-c/package.nix

@@ -0,0 +1,83 @@
+{ lib
+, stdenv
+, mkMesonDerivation
+, releaseTools
+
+, meson
+, ninja
+, pkg-config
+
+, nix-util-c
+, nix-store
+, nix-store-c
+, nix-main
+
+# Configuration Options
+
+, version
+}:
+
+let
+ inherit (lib) fileset;
+in
+
+mkMesonDerivation (finalAttrs: {
+ pname = "nix-main-c";
+ inherit version;
+
+ workDir = ./.;
+ fileset = fileset.unions [
+ ../../build-utils-meson
+ ./build-utils-meson
+ ../../.version
+ ./.version
+ ./meson.build
+ # ./meson.options
+ (fileset.fileFilter (file: file.hasExt "cc") ./.)
+ (fileset.fileFilter (file: file.hasExt "hh") ./.)
+ (fileset.fileFilter (file: file.hasExt "h") ./.)
+ ];
+
+ outputs = [ "out" "dev" ];
+
+ nativeBuildInputs = [
+ meson
+ ninja
+ pkg-config
+ ];
+
+ propagatedBuildInputs = [
+ nix-util-c
+ nix-store
+ nix-store-c
+ nix-main
+ ];
+
+ preConfigure =
+ # "Inline" .version so it's not a symlink, and includes the suffix.
+ # Do the meson utils, without modification.
+ ''
+ chmod u+w ./.version
+ echo ${version} > ../../.version
+ '';
+
+ mesonFlags = [
+ ];
+
+ env = lib.optionalAttrs (stdenv.isLinux && !(stdenv.hostPlatform.isStatic && stdenv.system == "aarch64-linux")) {
+ LDFLAGS = "-fuse-ld=gold";
+ };
+
+ enableParallelBuilding = true;
+
+ separateDebugInfo = !stdenv.hostPlatform.isStatic;
+
+ strictDeps = true;
+
+ hardeningDisable = lib.optional stdenv.hostPlatform.isStatic "pie";
+
+ meta = {
+ platforms = lib.platforms.unix ++ lib.platforms.windows;
+ };
+
+})

src/libmain/common-args.cc

@@ -5,6 +5,7 @@
 #include "logging.hh"
 #include "loggers.hh"
 #include "util.hh"
+#include "plugin.hh"
 
 namespace nix {
 

src/libmain/meson.build

@@ -64,6 +64,7 @@ subdir('build-utils-meson/diagnostics')
 sources = files(
  'common-args.cc',
  'loggers.cc',
+ 'plugin.cc',
  'progress-bar.cc',
  'shared.cc',
 )
@@ -79,6 +80,7 @@ include_dirs = [include_directories('.')]
 headers = [config_h] + files(
  'common-args.hh',
  'loggers.hh',
+ 'plugin.hh',
  'progress-bar.hh',
  'shared.hh',
 )