build: meson for libfetchers

flake.nix

@@ -180,6 +180,15 @@
             busybox-sandbox-shell = final.busybox-sandbox-shell or final.default-busybox-sandbox-shell;
           };
 
+          nix-fetchers = final.callPackage ./src/libfetchers/package.nix {
+            inherit
+              fileset
+              stdenv
+              officialRelease
+              versionSuffix
+              ;
+          };
+
           nix =
             final.callPackage ./package.nix {
               inherit
@@ -288,6 +297,7 @@
           # system, we should reenable these.
           #"nix-util" = { };
           #"nix-store" = { };
+          #"nix-fetchers" = { };
           "nix-internal-api-docs" = { };
         }
         // lib.optionalAttrs (builtins.elem system linux64BitSystems) {
@@ -351,12 +361,14 @@
           mesonFlags =
             map (transformFlag "libutil") pkgs.nix-util.mesonFlags
             ++ map (transformFlag "libstore") pkgs.nix-store.mesonFlags
+            ++ map (transformFlag "libfetchers") pkgs.nix-fetchers.mesonFlags
             ++ lib.optionals havePerl (map (transformFlag "perl") pkgs.nix-perl-bindings.mesonFlags)
             ;
 
           nativeBuildInputs = attrs.nativeBuildInputs or []
             ++ pkgs.nix-util.nativeBuildInputs
             ++ pkgs.nix-store.nativeBuildInputs
+            ++ pkgs.nix-fetchers.nativeBuildInputs
             ++ lib.optionals havePerl pkgs.nix-perl-bindings.nativeBuildInputs
             ++ [
               modular.pre-commit.settings.package

maintainers/hydra.nix

@@ -37,6 +37,7 @@ let
     "nix"
     "nix-util"
     "nix-store"
+    "nix-fetchers"
   ];
 in
 {

meson.build

@@ -8,5 +8,6 @@ project('nix-dev-shell', 'cpp',
 
 subproject('libutil')
 subproject('libstore')
+subproject('libfetchers')
 subproject('perl')
 subproject('internal-api-docs')

src/libfetchers/.version

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

src/libfetchers/meson.build

@@ -0,0 +1,141 @@
+project('nix-fetchers', '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')
+
+# See note in ../nix-util/meson.build
+deps_private = [ ]
+
+# See note in ../nix-util/meson.build
+deps_public = [ ]
+
+# See note in ../nix-util/meson.build
+deps_other = [ ]
+
+configdata = configuration_data()
+
+nix_util = dependency('nix-util')
+if nix_util.type_name() == 'internal'
+  # subproject sadly no good for pkg-config module
+  deps_other += nix_util
+else
+  deps_public += nix_util
+endif
+
+nix_store = dependency('nix-store')
+if nix_store.type_name() == 'internal'
+  # subproject sadly no good for pkg-config module
+  deps_other += nix_store
+else
+  deps_public += nix_store
+endif
+
+
+nlohmann_json = dependency('nlohmann_json', version : '>= 3.9')
+deps_public += nlohmann_json
+
+libgit2 = dependency('libgit2')
+deps_public += libgit2
+
+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.
+  '-include', 'config-util.h',
+  '-include', 'config-store.h',
+  # '-include', 'config-fetchers.h',
+  '-Wno-deprecated-declarations',
+  '-Wimplicit-fallthrough',
+  '-Werror=switch',
+  '-Werror=switch-enum',
+  '-Wdeprecated-copy',
+  '-Wignored-qualifiers',
+  # Enable assertions in libstdc++ by default. Harmless on libc++. Benchmarked
+  # at ~1% overhead in `nix search`.
+  #
+  # FIXME: remove when we get meson 1.4.0 which will default this to on for us:
+  # https://mesonbuild.com/Release-notes-for-1-4-0.html#ndebug-setting-now-controls-c-stdlib-assertions
+  '-D_GLIBCXX_ASSERTIONS=1',
+  language : 'cpp',
+)
+
+sources = files(
+  'attrs.cc',
+  'cache.cc',
+  'fetch-settings.cc',
+  'fetch-to-store.cc',
+  'fetchers.cc',
+  'filtering-source-accessor.cc',
+  'git.cc',
+  'git-utils.cc',
+  'github.cc',
+  'indirect.cc',
+  'mercurial.cc',
+  'mounted-source-accessor.cc',
+  'path.cc',
+  'store-path-accessor.cc',
+  'registry.cc',
+  'tarball.cc',
+)
+
+headers = files(
+  'attrs.hh',
+  'cache.hh',
+  'fetch-settings.hh',
+  'fetch-to-store.hh',
+  'filtering-source-accessor.hh',
+  'git-utils.hh',
+  'mounted-source-accessor.hh',
+  'fetchers.hh',
+  'registry.hh',
+  'store-path-accessor.hh',
+  'tarball.hh',
+)
+
+this_library = library(
+  'nixfetchers',
+  sources,
+  dependencies : deps_public + deps_private + deps_other,
+  install : true,
+)
+
+install_headers(headers, subdir : 'nix', preserve_path : true)
+
+requires = []
+if nix_util.type_name() == 'internal'
+  # `requires` cannot contain declared dependencies (from the
+  # subproject), so we need to do this manually
+  requires += 'nix-util'
+endif
+if nix_store.type_name() == 'internal'
+  requires += 'nix-store'
+endif
+requires += deps_public
+
+import('pkgconfig').generate(
+  this_library,
+  filebase : meson.project_name(),
+  name : 'Nix',
+  description : 'Nix Package Manager',
+  subdirs : ['nix'],
+  extra_cflags : ['-std=c++2a'],
+  requires : requires,
+  requires_private : deps_private,
+)
+
+meson.override_dependency(meson.project_name(), declare_dependency(
+  include_directories : include_directories('.'),
+  link_with : this_library,
+  compile_args : ['-std=c++2a'],
+  dependencies : [nix_util, nix_store],
+))

src/libfetchers/package.nix

@@ -0,0 +1,106 @@
+{ lib
+, stdenv
+, releaseTools
+, fileset
+
+, meson
+, ninja
+, pkg-config
+
+, nix-util
+, nix-store
+, nlohmann_json
+, libgit2
+, man
+
+# Configuration Options
+
+, versionSuffix ? ""
+, officialRelease ? false
+
+# Check test coverage of Nix. Probably want to use with with at least
+# one of `doCheck` or `doInstallCheck` enabled.
+, withCoverageChecks ? false
+
+# Avoid setting things that would interfere with a functioning devShell
+, forDevShell ? false
+}:
+
+let
+  version = lib.fileContents ./.version + versionSuffix;
+
+  mkDerivation =
+    if withCoverageChecks
+    then
+      # TODO support `finalAttrs` args function in
+      # `releaseTools.coverageAnalysis`.
+      argsFun:
+         releaseTools.coverageAnalysis (let args = argsFun args; in args)
+    else stdenv.mkDerivation;
+in
+
+mkDerivation (finalAttrs: {
+  pname = "nix-fetchers";
+  inherit version;
+
+  src = fileset.toSource {
+    root = ./.;
+    fileset = fileset.unions [
+      ./meson.build
+      (fileset.fileFilter (file: file.hasExt "cc") ./.)
+      (fileset.fileFilter (file: file.hasExt "hh") ./.)
+    ];
+  };
+
+  outputs = [ "out" "dev" ];
+
+  nativeBuildInputs = [
+    meson
+    ninja
+    pkg-config
+  ];
+
+  buildInputs = [
+    libgit2
+  ];
+
+  propagatedBuildInputs = [
+    nix-store
+    nix-util
+    nlohmann_json
+  ];
+
+  preConfigure =
+    # "Inline" .version so its not a symlink, and includes the suffix
+    ''
+      echo ${version} > .version
+    '';
+
+  env = lib.optionalAttrs (stdenv.isLinux && !(stdenv.hostPlatform.isStatic && stdenv.system == "aarch64-linux")) {
+    LDFLAGS = "-fuse-ld=gold";
+  };
+
+  enableParallelBuilding = true;
+
+  postInstall =
+    # Remove absolute path to boost libs
+    ''
+    '';
+
+  separateDebugInfo = !stdenv.hostPlatform.isStatic;
+
+  # TODO `releaseTools.coverageAnalysis` in Nixpkgs needs to be updated
+  # to work with `strictDeps`.
+  strictDeps = !withCoverageChecks;
+
+  hardeningDisable = lib.optional stdenv.hostPlatform.isStatic "pie";
+
+  meta = {
+    platforms = lib.platforms.unix ++ lib.platforms.windows;
+  };
+
+} // lib.optionalAttrs withCoverageChecks {
+  lcovFilter = [ "*-tab.*" ];
+
+  hardeningDisable = ["fortify"];
+})

src/libstore/meson.build

@@ -425,12 +425,13 @@ this_library = library(
 
 install_headers(headers, subdir : 'nix', preserve_path : true)
 
-requires = deps_public
+requires = []
 if nix_util.type_name() == 'internal'
   # `requires` cannot contain declared dependencies (from the
   # subproject), so we need to do this manually
-  requires = [ 'nix-util' ] + requires
+  requires += 'nix-util'
 endif
+requires += deps_public
 
 import('pkgconfig').generate(
   this_library,

src/libutil/package.nix

@@ -72,6 +72,7 @@ mkDerivation (finalAttrs: {
   ;
 
   propagatedBuildInputs = [
+    boost.dev
     libarchive
     nlohmann_json
   ];