autotools -> meson

[Ericson2314]

Original author is @delroth, for Lix's Hydra, thank you!

Depends on #1421

[Mindavi]

hydra> doc/manual/meson.build:29: WARNING: Project does not target a minimum version but uses feature deprecated since '0.60.0': install_subdir with empty directory. It worked by accident and is buggy. Use install_emptydir instead.
hydra> Build targets in project: 3
hydra> WARNING: Deprecated features used:
hydra>  * 0.60.0: {'install_subdir with empty directory'}

[Mindavi]

Trying this out now (so including nix-eval-jobs) using this PR by zowoq (thanks to them!). But having some issues with the CSS (I think?), see NixOS/nixpkgs#356391 (comment)

[Ericson2314]

@Mindavi I had trouble finding that exact message, but I think I fixed the issue?

[Ericson2314]

OK matching what I wrote in #1421 (comment), this one seems easier so doing it first. It now doesn't depend on that, and should be ready to go.

[Mindavi]

I noticed this while running the phases manually (no action needed, but just wanted to note it down somewhere):

[11/13] Compiling C++ object src/hydra-queue-runner/hydra-queue-runner.p/queue-monitor.cc.o
../src/hydra-queue-runner/queue-monitor.cc: In member function ‘Jobset::ptr State::createJobset(pqxx::work&, const std::string&, const std::string&, JobsetID)’:
../src/hydra-queue-runner/queue-monitor.cc:623:18: warning: ‘bool pqxx::row::empty() const’ is deprecated: Row slicing is going away. [-Wdeprecated-declarations]
  623 |     if (res.empty()) throw Error("missing jobset - can't happen");
      |         ~~~~~~~~~^~
In file included from /nix/store/knjg1dsi6abrqb4hh3aid715i9jbfzp2-libpqxx-7.7.5/include/pqxx/transaction_base.hxx:37,
                 from /nix/store/knjg1dsi6abrqb4hh3aid715i9jbfzp2-libpqxx-7.7.5/include/pqxx/dbtransaction.hxx:20,
                 from /nix/store/knjg1dsi6abrqb4hh3aid715i9jbfzp2-libpqxx-7.7.5/include/pqxx/blob.hxx:34,
                 from /nix/store/knjg1dsi6abrqb4hh3aid715i9jbfzp2-libpqxx-7.7.5/include/pqxx/pqxx:6,
                 from ../src/libhydra/db.hh:3,
                 from ../src/hydra-queue-runner/state.hh:15,
                 from ../src/hydra-queue-runner/queue-monitor.cc:1:
/nix/store/knjg1dsi6abrqb4hh3aid715i9jbfzp2-libpqxx-7.7.5/include/pqxx/row.hxx:184:3: note: declared here
  184 |   empty() const noexcept;
      |   ^~~~~

Performance of the build in general seems a lot better (due to configure not happening anymore, but also other things happened that took a lot of time and I didn't understand).

It is a bit unfortunate that meson is now showing output of yath (running the tests) directly, but not a really big deal to me. I guess the silent timeout for h.n.o. is long enough to not cause issues there. But still a bit weird to look at without direct output.

From the outputs there are some diffs:

• bin/
  • missing: hydra-dev-server
• lib/hydra/root/
  • missing; 158 files (mostly javascript, css files)
• lib/hydra/sql/
  • missing: update-dbix-harness.sh
• lib/hydra/ttf/
  • missing: README.txt (doesn't seem important)
• share/
  • missing 55 files (html, woff2, javascript, css), the whole share/doc/hydra folder is missing

Feels like some things don't get installed as they should be? Or are these files all unnecessary?

[Mindavi]

Ah, for the documentation I guess I was looking at the wrong output, oops...