autotools -> meson

There are some known regressions regarding local testing setups - since
everything was kinda half written with the expectation that build dir =
source dir (which should not be true anymore). But everything builds and
the test suite runs fine, after several hours spent debugging random
crashes in libpqxx with MALLOC_PERTURB_...

(cherry picked from commit 4b886d9)

.gitignore

@@ -1,47 +1,7 @@
-/.pls_cache
-*.o
 *~
-Makefile
-Makefile.in
-.deps
-.hydra-data
-/config.guess
-/config.log
-/config.status
-/config.sub
-/configure
-/depcomp
-/libtool
-/ltmain.sh
-/autom4te.cache
-/aclocal.m4
-/missing
-/install-sh
+.test_info.*
 /src/sql/hydra-postgresql.sql
 /src/sql/hydra-sqlite.sql
 /src/sql/tmp.sqlite
-/src/root/static/bootstrap
-/src/root/static/js/flot
-/tests
-/doc/manual/images
-/doc/manual/manual.html
-/doc/manual/manual.pdf
-/t/.bzr*
-/t/.git*
-/t/.hg*
-/t/nix
-/t/data
-/t/jobs/config.nix
-t/jobs/declarative/project.json
-/inst
-hydra-config.h
-hydra-config.h.in
 result
 result-*
-outputs
-config
-stamp-h1
-src/hydra-evaluator/hydra-evaluator
-src/hydra-queue-runner/hydra-queue-runner
-src/root/static/fontawesome/
-src/root/static/bootstrap*/

doc/manual/meson.build

@@ -0,0 +1,33 @@
+srcs = files(
+  'src/SUMMARY.md',
+  'src/about.md',
+  'src/api.md',
+  'src/configuration.md',
+  'src/hacking.md',
+  'src/installation.md',
+  'src/introduction.md',
+  'src/jobs.md',
+  'src/monitoring/README.md',
+  'src/notifications.md',
+  'src/plugins/README.md',
+  'src/plugins/RunCommand.md',
+  'src/plugins/declarative-projects.md',
+  'src/projects.md',
+  'src/webhooks.md',
+)
+
+manual = custom_target(
+  'manual',
+  command: [
+    mdbook, 'build', '@SOURCE_ROOT@/doc/manual', '-d', meson.current_build_dir() / 'html'
+  ],
+  depend_files: srcs,
+  output: ['html'],
+  build_by_default: true,
+)
+
+install_subdir(
+  manual.full_path(),
+  install_dir: get_option('datadir') / 'doc/hydra',
+  strip_directory: true,
+)

meson.build

@@ -0,0 +1,36 @@
+project('hydra', 'cpp',
+  version: files('version.txt'),
+  license: 'GPL-3.0',
+  default_options: [
+    'debug=true',
+    'optimization=2',
+    'cpp_std=c++20',
+  ],
+)
+
+nix_expr_dep = dependency('nix-expr', required: true)
+nix_main_dep = dependency('nix-main', required: true)
+nix_store_dep = dependency('nix-store', required: true)
+
+# Lix/Nix need extra flags not provided in its pkg-config files.
+nix_dep = declare_dependency(
+  dependencies: [
+    nix_expr_dep,
+    nix_main_dep,
+    nix_store_dep,
+  ],
+  compile_args: ['-include', 'nix/config.h'],
+)
+
+pqxx_dep = dependency('libpqxx', required: true)
+
+prom_cpp_core_dep = dependency('prometheus-cpp-core', required: true)
+prom_cpp_pull_dep = dependency('prometheus-cpp-pull', required: true)
+
+mdbook = find_program('mdbook', native: true)
+perl = find_program('perl', native: true)
+
+subdir('doc/manual')
+subdir('nixos-modules')
+subdir('src')
+subdir('t')

nixos-modules/meson.build

@@ -0,0 +1,4 @@
+install_data('hydra.nix',
+  install_dir: get_option('datadir') / 'nix',
+  rename: ['hydra-module.nix'],
+)

package.nix

@@ -13,7 +13,8 @@
 , git
 
 , makeWrapper
-, autoreconfHook
+, meson
+, ninja
 , nukeReferences
 , pkg-config
 , mdbook
@@ -92,6 +93,7 @@ let
         DigestSHA1
         EmailMIME
         EmailSender
+        FileCopyRecursive
         FileLibMagic
         FileSlurper
         FileWhich
@@ -139,28 +141,22 @@ stdenv.mkDerivation (finalAttrs: {
   src = fileset.toSource {
     root = ./.;
     fileset = fileset.unions ([
-      ./version.txt
-      ./configure.ac
-      ./Makefile.am
-      ./src
       ./doc
-      ./nixos-modules/hydra.nix
-      # These are always needed to appease Automake
-      ./t/Makefile.am
-      ./t/jobs/config.nix.in
-      ./t/jobs/declarative/project.json.in
-    ] ++ lib.optionals finalAttrs.doCheck [
+      ./meson.build
+      ./nixos-modules
+      ./src
       ./t
+      ./version.txt
       ./.perlcriticrc
-      ./.yath.rc
     ]);
   };
 
   strictDeps = true;
 
   nativeBuildInputs = [
     makeWrapper
-    autoreconfHook
+    meson
+    ninja
     nukeReferences
     pkg-config
     mdbook
@@ -228,6 +224,12 @@ stdenv.mkDerivation (finalAttrs: {
 
   OPENLDAP_ROOT = openldap;
 
+  mesonBuildType = "release";
+
+  postPatch = ''
+    patchShebangs .
+  '';
+
   shellHook = ''
     pushd $(git rev-parse --show-toplevel) >/dev/null
 
@@ -241,14 +243,11 @@ stdenv.mkDerivation (finalAttrs: {
     popd >/dev/null
   '';
 
-  NIX_LDFLAGS = [ "-lpthread" ];
-
-  enableParallelBuilding = true;
-
   doCheck = true;
 
+  mesonCheckFlags = [ "--verbose" ];
+
   preCheck = ''
-    patchShebangs .
     export LOGNAME=''${LOGNAME:-foo}
     # set $HOME for bzr so it can create its trace file
     export HOME=$(mktemp -d)

src/hydra-evaluator/meson.build

@@ -0,0 +1,9 @@
+hydra_evaluator = executable('hydra-evaluator',
+  'hydra-evaluator.cc',
+  dependencies: [
+    libhydra_dep,
+    nix_dep,
+    pqxx_dep,
+  ],
+  install: true,
+)

src/hydra-queue-runner/meson.build

@@ -0,0 +1,22 @@
+srcs = files(
+  'builder.cc',
+  'build-remote.cc',
+  'build-result.cc',
+  'dispatcher.cc',
+  'hydra-queue-runner.cc',
+  'nar-extractor.cc',
+  'queue-monitor.cc',
+)
+
+hydra_queue_runner = executable('hydra-queue-runner',
+  'hydra-queue-runner.cc',
+  srcs,
+  dependencies: [
+    libhydra_dep,
+    nix_dep,
+    pqxx_dep,
+    prom_cpp_core_dep,
+    prom_cpp_pull_dep,
+  ],
+  install: true,
+)