Package the Nix CLI with Meson

Co-Authored-By: Qyriad <qyriad@qyriad.me>

build-utils-meson/generate-header/meson.build

@@ -0,0 +1,9 @@
+bash = find_program('bash', native: true)
+
+gen_header = generator(
+  bash,
+  arguments : [ '-c', '{ echo \'R"__NIX_STR(\' && cat @INPUT@ && echo \')__NIX_STR"\'; } > "$1"', '_ignored_argv0', '@OUTPUT@' ],
+  output : '@PLAINNAME@.gen.hh',
+  #install : true,
+  #install_dir : get_option('includedir') / 'nix',
+)

meson.build

@@ -6,6 +6,7 @@ project('nix-dev-shell', 'cpp',
   subproject_dir : 'src',
 )
 
+# Internal Libraries
 subproject('libutil')
 subproject('libstore')
 subproject('libfetchers')
@@ -14,11 +15,14 @@ subproject('libflake')
 subproject('libmain')
 subproject('libcmd')
 
+# Executables
+subproject('nix')
+
 # Docs
 subproject('internal-api-docs')
 subproject('external-api-docs')
 
-# C wrappers
+# External C wrapper libraries
 subproject('libutil-c')
 subproject('libstore-c')
 subproject('libexpr-c')

packaging/components.nix

@@ -32,6 +32,9 @@ in
 
   nix-cmd = callPackage ../src/libcmd/package.nix { };
 
+  # Will replace `nix` once the old build system is gone.
+  nix-ng = callPackage ../src/nix/package.nix { };
+
   nix-internal-api-docs = callPackage ../src/internal-api-docs/package.nix { };
   nix-external-api-docs = callPackage ../src/external-api-docs/package.nix { };
 

packaging/hydra.nix

@@ -53,6 +53,7 @@ let
     "nix-flake-tests"
     "nix-main"
     "nix-cmd"
+    "nix-ng"
   ];
 in
 {

src/libexpr/meson.build

@@ -117,20 +117,17 @@ lexer_tab = custom_target(
   install_dir : get_option('includedir') / 'nix',
 )
 
+subdir('build-utils-meson/generate-header')
+
 generated_headers = []
 foreach header : [
   'imported-drv-to-derivation.nix',
   'fetchurl.nix',
   'call-flake.nix',
 ]
-  generated_headers += custom_target(
-    command : [ 'bash', '-c', '{ echo \'R"__NIX_STR(\' && cat @INPUT@ && echo \')__NIX_STR"\'; } > "$1"', '_ignored_argv0', '@OUTPUT@' ],
-    input : header,
-    output : '@PLAINNAME@.gen.hh',
-  )
+  generated_headers += gen_header.process(header)
 endforeach
 
-
 sources = files(
   'attr-path.cc',
   'attr-set.cc',

src/libexpr/primops/meson.build

@@ -1,12 +1,7 @@
-foreach header : [
+generated_headers += gen_header.process(
   'derivation.nix',
-]
-  generated_headers += custom_target(
-    command : [ 'bash', '-c', '{ echo \'R"__NIX_STR(\' && cat @INPUT@ && echo \')__NIX_STR"\'; } > "$1"', '_ignored_argv0', '@OUTPUT@' ],
-    input : header,
-    output : '@PLAINNAME@.gen.hh',
-  )
-endforeach
+  preserve_path_from: meson.project_source_root(),
+)
 
 sources += files(
   'context.cc',

src/libstore/meson.build

@@ -99,18 +99,14 @@ deps_public += nlohmann_json
 sqlite = dependency('sqlite3', 'sqlite', version : '>=3.6.19')
 deps_private += sqlite
 
+subdir('build-utils-meson/generate-header')
+
 generated_headers = []
 foreach header : [
   'schema.sql',
   'ca-specific-schema.sql',
 ]
-  generated_headers += custom_target(
-    command : [ 'bash', '-c', '{ echo \'R"__NIX_STR(\' && cat @INPUT@ && echo \')__NIX_STR"\'; } > "$1"', '_ignored_argv0', '@OUTPUT@' ],
-    input : header,
-    output : '@PLAINNAME@.gen.hh',
-    install : true,
-    install_dir : get_option('includedir') / 'nix',
-  )
+  generated_headers += gen_header.process(header)
 endforeach
 
 busybox = find_program(get_option('sandbox-shell'), required : false)

src/nix/.version

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

src/nix/build-remote

@@ -0,0 +1 @@
+../build-remote

src/nix/build-utils-meson

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

src/nix/doc

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

src/nix/help-stores.md

@@ -0,0 +1 @@
+../../doc/manual/src/store/types/index.md.in

src/nix/local.mk

@@ -50,19 +50,6 @@ src/nix/main.cc: \
   doc/manual/generate-manpage.nix.gen.hh \
   doc/manual/utils.nix.gen.hh doc/manual/generate-settings.nix.gen.hh \
   doc/manual/generate-store-info.nix.gen.hh \
-  src/nix/generated-doc/help-stores.md
-
-src/nix/generated-doc/files/%.md: doc/manual/src/command-ref/files/%.md
-	@mkdir -p $$(dirname $@)
-	@cp $< $@
+  src/nix/generated-doc/help-stores.md.gen.hh
 
 src/nix/profile.cc: src/nix/profile.md src/nix/generated-doc/files/profiles.md.gen.hh
-
-src/nix/generated-doc/help-stores.md: doc/manual/src/store/types/index.md.in
-	@mkdir -p $$(dirname $@)
-	@echo 'R"(' >> $@.tmp
-	@echo >> $@.tmp
-	@cat $^ >> $@.tmp
-	@echo >> $@.tmp
-	@echo ')"' >> $@.tmp
-	@mv $@.tmp $@

src/nix/main.cc

@@ -333,7 +333,7 @@ struct CmdHelpStores : Command
     std::string doc() override
     {
         return
-          #include "generated-doc/help-stores.md"
+          #include "help-stores.md.gen.hh"
           ;
     }
 

src/nix/meson.build

@@ -0,0 +1,179 @@
+project('nix', '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')
+
+deps_private_maybe_subproject = [
+  dependency('nix-util'),
+  dependency('nix-store'),
+  dependency('nix-expr'),
+  dependency('nix-fetchers'),
+  dependency('nix-main'),
+  dependency('nix-cmd'),
+]
+deps_public_maybe_subproject = [
+]
+subdir('build-utils-meson/subprojects')
+
+subdir('build-utils-meson/export-all-symbols')
+
+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.hh',
+  '-include', 'config-store.hh',
+  '-include', 'config-expr.hh',
+  #'-include', 'config-fetchers.hh',
+  '-include', 'config-main.hh',
+  '-include', 'config-cmd.hh',
+  language : 'cpp',
+)
+
+subdir('build-utils-meson/diagnostics')
+subdir('build-utils-meson/generate-header')
+
+nix_sources = files(
+  'add-to-store.cc',
+  'app.cc',
+  'build.cc',
+  'bundle.cc',
+  'cat.cc',
+  'config-check.cc',
+  'config.cc',
+  'copy.cc',
+  'derivation-add.cc',
+  'derivation-show.cc',
+  'derivation.cc',
+  'develop.cc',
+  'diff-closures.cc',
+  'dump-path.cc',
+  'edit.cc',
+  'env.cc',
+  'eval.cc',
+  'flake.cc',
+  'fmt.cc',
+  'hash.cc',
+  'log.cc',
+  'ls.cc',
+  'main.cc',
+  'make-content-addressed.cc',
+  'nar.cc',
+  'optimise-store.cc',
+  'path-from-hash-part.cc',
+  'path-info.cc',
+  'prefetch.cc',
+  'profile.cc',
+  'realisation.cc',
+  'registry.cc',
+  'repl.cc',
+  'run.cc',
+  'search.cc',
+  'sigs.cc',
+  'store-copy-log.cc',
+  'store-delete.cc',
+  'store-gc.cc',
+  'store-info.cc',
+  'store-repair.cc',
+  'store.cc',
+  'unix/daemon.cc',
+  'upgrade-nix.cc',
+  'verify.cc',
+  'why-depends.cc',
+)
+
+nix_sources += [
+  gen_header.process('doc/manual/generate-manpage.nix'),
+  gen_header.process('doc/manual/generate-settings.nix'),
+  gen_header.process('doc/manual/generate-store-info.nix'),
+  gen_header.process('doc/manual/utils.nix'),
+  gen_header.process('get-env.sh'),
+  gen_header.process('profiles.md'),
+  gen_header.process('help-stores.md'),
+]
+
+if host_machine.system() != 'windows'
+  nix_sources += files(
+    'unix/daemon.cc',
+  )
+endif
+
+# The rest of the subdirectories aren't separate components,
+# just source files in another directory, so we process them here.
+
+build_remote_sources = files(
+  'build-remote/build-remote.cc',
+)
+nix_build_sources = files(
+  'nix-build/nix-build.cc',
+)
+nix_channel_sources = files(
+  'nix-channel/nix-channel.cc',
+)
+unpack_channel_gen = gen_header.process('nix-channel/unpack-channel.nix')
+nix_collect_garbage_sources = files(
+  'nix-collect-garbage/nix-collect-garbage.cc',
+)
+nix_copy_closure_sources = files(
+  'nix-copy-closure/nix-copy-closure.cc',
+)
+nix_env_buildenv_gen = gen_header.process('nix-env/buildenv.nix')
+nix_env_sources = files(
+  'nix-env/nix-env.cc',
+  'nix-env/user-env.cc',
+)
+nix_instantiate_sources = files(
+  'nix-instantiate/nix-instantiate.cc',
+)
+nix_store_sources = files(
+  'nix-store/dotgraph.cc',
+  'nix-store/graphml.cc',
+  'nix-store/nix-store.cc',
+)
+
+# Hurray for Meson list flattening!
+sources = [
+  nix_sources,
+  build_remote_sources,
+  nix_build_sources,
+  nix_channel_sources,
+  unpack_channel_gen,
+  nix_collect_garbage_sources,
+  nix_copy_closure_sources,
+  nix_env_buildenv_gen,
+  nix_env_sources,
+  nix_instantiate_sources,
+  nix_store_sources,
+]
+
+include_dirs = [include_directories('.')]
+
+this_exe = executable(
+  meson.project_name(),
+  sources,
+  dependencies : deps_private_subproject + deps_private + deps_other,
+  include_directories : include_dirs,
+  link_args: linker_export_flags,
+  install : true,
+)
+
+test(
+  meson.project_name(),
+  this_exe,
+  env : {
+    '_NIX_TEST_UNIT_DATA': meson.current_source_dir() / 'data',
+  },
+  protocol : 'gtest',
+)

src/nix/nix-build

@@ -0,0 +1 @@
+../nix-build

src/nix/nix-channel

@@ -0,0 +1 @@
+../nix-channel

src/nix/nix-collect-garbage

@@ -0,0 +1 @@
+../nix-collect-garbage

src/nix/nix-copy-closure

@@ -0,0 +1 @@
+../nix-copy-closure

src/nix/nix-env

@@ -0,0 +1 @@
+../nix-env

src/nix/nix-instantiate

@@ -0,0 +1 @@
+../nix-instantiate

src/nix/nix-store

@@ -0,0 +1 @@
+../nix-store/