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|
{
# frq is Jolt source, so "building" it is three things, not one:
#
# jolt the runtime that reads it (github:jolt-lang/jolt)
# jolt-native libvidya and libjoltmoq, in Rust (gitlab:nandithebull/jolt-native)
# frq this tree, with its deps resolved to store paths
#
# Jolt resolves deps.edn by running git at startup, which a build sandbox has
# no network for — so every dep is fetched by Nix instead and handed back as
# a :local/root through -Sdeps.
#
# nix build .#frq && ./result/bin/frq
#
# On a machine that is not NixOS the GL driver is the host's and the loader
# will not find it, so the window never opens ("GL display: argument does not
# name a valid config"). The launcher handles that itself: off NixOS it hands
# the process to nixGL, which puts the host's driver ahead of the store's.
# Nothing extra to type, and a distrobox/container Arch is the same case as
# a bare one.
description = "frq — a freeq client in jolt";
inputs = {
nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
# `git+https` with `?submodules=1` rather than the github scheme: Jolt's
# own flake declares `self.submodules`, which this Nix rejects when the
# flake is fetched as `github:`. Its outputs are not what we take — the
# runtime is built here, by joltFrom — but it is a flake all the same, so
# its own inputs are locked with ours rather than left to float, and
# `vendor/` comes along as the submodule the build needs.
#
# The fork rather than jolt-lang/jolt, and unpinned: the desktop follows
# the fork's main. It used to be paired with a second, pinned input for
# the APK's boot image; there is no jolt APK now, so there is one runtime
# and one rev.
jolt-src = {
url = "git+https://gitlab.com/nandithebull/jolt?submodules=1";
inputs.nixpkgs.follows = "nixpkgs";
};
# The source half of jolt-native: the Jolt code under glimmer-backends/ that
# binds the native objects, and the flake that builds them. This input is
# what `just cosmic run` builds against.
#
# It carries both backends that are left — glimmer-cosmic over
# libjoltcosmic for the window, glimmer-tui over libjolttui for the
# terminal — and no longer jvui or vidya, which were experiments.
#
# Pinned all the same, and pinned to a rev, because an
# unpinned `main` is a build whose native half is free to sit at a
# different commit from the tree that talks to it. It did, and what the
# drift cost was silence: the Jolt half sent a reaction pill's hover card
# to a libvidya with no handler for one, and the pill said nothing.
# It also carries the terminal backend — crates/jolt-tui, the same tree ABI
# over a grid of cells, and jolt/glimmer-tui beside glimmer-vidya. That was
# a second input at a second rev while it lived on a branch, which is the
# drift this comment warns about wearing a different hat: one input, and
# the window and the terminal are the same library either way.
jolt-native = {
url = "git+https://gitlab.com/nandithebull/jolt-native?rev=8e8cd5192dc161b423c0ee5dd41a7a058b24b409";
inputs.nixpkgs.follows = "nixpkgs";
};
# The sha deps.edn pins, on the fork with the reconciler fixes.
glimmer = {
url = "git+https://gitlab.com/nandithebull/glimmer?rev=399df371c790d690fb6e4560c3d4d7f838502857";
flake = false;
};
# Only ever used off NixOS, to put the host GL driver on the loader path.
nixgl = {
url = "github:nix-community/nixGL";
inputs.nixpkgs.follows = "nixpkgs";
};
# Wraps a closure into a single self-extracting file. Only the `appimage`
# output evaluates it.
nix-appimage = {
url = "github:ralismark/nix-appimage";
inputs.nixpkgs.follows = "nixpkgs";
};
};
outputs = { self, nixpkgs, jolt-src, jolt-native, glimmer, nixgl, nix-appimage }:
let
systems = [ "x86_64-linux" "aarch64-linux" ];
forEachSystem = f:
nixpkgs.lib.genAttrs systems (system: f nixpkgs.legacyPackages.${system});
# Mesa, despite the name: it covers Intel and AMD alike. The NVIDIA
# wrappers are the ones that need --impure (they read the host kernel
# module's version), which is why this only ever reaches for Intel.
#
# Built from nixGL's default.nix rather than taken from its flake
# outputs, for the one argument the flake hardcodes on: `enable32bits`,
# which on x86_64 puts a second, i686 copy of mesa, its LLVM, and
# intel-media-driver into the wrapper. frq is 64-bit on both halves —
# the Rust cdylibs and the Chez runtime — so nothing here ever opens the
# 32-bit driver, and carrying it is most of the dev shell's closure.
nixGLFor = pkgs: (import nixgl {
inherit pkgs;
enable32bits = false;
}).nixGLIntel;
# The Android SDK wants two things `nixpkgs.legacyPackages` cannot give:
# `allowUnfree`, because the SDK's own licence is not free, and
# `android_sdk.accept_license`, which is how you say so in a file rather
# than at a prompt a build has no terminal for. Neither can be set on a
# legacyPackages attribute after the fact, so this is a second import of
# the same locked nixpkgs rather than a second nixpkgs.
#
# This used to live in `just apk` as a `nix build --impure --expr` with
# `builtins.getFlake "github:NixOS/nixpkgs/nixos-unstable"` inside it —
# which fetched whatever nixos-unstable was that morning, not what
# flake.lock pins, so the SDK under the APK and the nixpkgs under
# everything else were free to drift apart. Here they are the same rev.
androidPkgsFor = system: import nixpkgs {
inherit system;
config = {
allowUnfree = true;
android_sdk.accept_license = true;
};
};
# Only the floor Gradle stands on. It installs build-tools and a platform
# into ANDROID_HOME itself as it goes — see `just apk` for why that means
# a writable copy — so composing more of them here buys nothing.
#
# includeNDK = false deliberately: the app is Dart and path_provider is
# platform channels, so there is no native code to need one, and asking
# for it is a few hundred megabytes and a Gradle fetch of that exact NDK.
androidSdkFor = system:
let android = androidPkgsFor system; in
(android.androidenv.composeAndroidPackages {
cmdLineToolsVersion = "13.0";
buildToolsVersions = [ "34.0.0" ];
platformVersions = [ "35" "34" ];
includeNDK = false;
}).androidsdk;
# egui reaches for these with dlopen rather than linking them, so being
# in the cdylib's buildInputs is not enough — whatever starts frq has to
# put them on the loader path itself. Without libx11 here, vidya reports
# "X11 unavailable", falls back to Wayland, and winit refuses to build a
# second event loop after the failed first one.
#
# Out here rather than beside the package that first needed them: the
# dev shell starts frq too, on this tree's source rather than the store's
# copy of it, and a second copy of this list is a second chance for the
# two ways of running to disagree about what the window needs.
runtimeLibsFor = pkgs: with pkgs; [
libGL
libxkbcommon
wayland
libx11
libxcursor
libxi
libxrandr
vulkan-loader
];
in
{
packages = forEachSystem (pkgs:
let
inherit (pkgs) lib;
nixGL = nixGLFor pkgs;
# libvidya (the retained-tree ABI glimmer-vidya binds, on egui),
# libjolttui (the same tree over a grid of cells) and libjoltmoq (the
# AV media plane) — one workspace, three cdylibs, taken from
# jolt-native's own flake rather than rebuilt here.
#
# This used to be a rustPlatform.buildRustPackage over the same
# source, which meant restating upstream's build: the seven git deps
# hashed by hand in `cargoLock.outputHashes` and re-hashed whenever
# its Cargo.lock moved, the linuxHeaders path v4l2r's bindgen wants,
# and a postPatch dropping the .cargo/config.toml that pointed the
# build at DotSlash. Upstream's flake says all of that itself now,
# and says it once. It also builds cpal with the `pipewire` feature,
# which the restatement did not — so device names in a call are
# PipeWire's rather than raw ALSA PCMs.
# libjolttui only. Not libjoltmoq, whose job `frq.av.plane` does
# now, and no longer libvidya either: the window is jvui on SDL,
# so the only object left out of that Cargo workspace is the
# terminal backend, and only `just tui` loads it.
#
# This makes the closure smaller and the APK smaller. It does NOT
# make the build shorter, and it is worth being exact about why:
# jolt-native compiles its external crates ONCE, in a
# `buildDepsOnly` derivation shared by all three objects, so
# asking for two of them still builds every dependency the third
# has — the 440 crates that are jolt-moq's alone. Getting those
# out of the build is a change in jolt-native, not here: either
# jolt-moq leaves that workspace, or its deps artifact stops
# being workspace-wide.
native =
let np = jolt-native.packages.${pkgs.stdenv.hostPlatform.system};
in pkgs.symlinkJoin {
name = "jolt-native-ui";
# Both backends there are. libjoltcosmic is the window —
# libcosmic behind the same retained-tree ABI — and libjolttui
# is the terminal. Neither is libvidya and neither is jvui:
# those were experiments and are gone from this tree entirely.
paths = [ np.libjolttui np.libjoltcosmic ];
};
# libmoq_ffi — MoQ over QUIC behind UniFFI's C ABI, FETCHED rather
# than built. This is the object `frq.moq.raw` is generated from.
#
# Fetched because building it is the thing this whole exercise is
# about: moq-ffi pulls moq-native, iroh, quinn, rustls and aws-lc-sys
# behind it, which is 440 crates that nothing else in this tree
# needs. Upstream already publishes the object for both Linux
# architectures, so we take those bytes.
#
# Pinned to a release and to a hash, and the hashes below are
# upstream's own published .sha256 files rather than ones observed
# here — a `nix-prefetch` of whatever the URL serves today would
# record that it downloaded something, not that it downloaded the
# right thing.
#
# WHAT THIS BUILD IS NOT: moq-ffi's `audio` and `video` features are
# on by default upstream and are OFF in these artifacts, so there is
# no publish_audio/publish_video and no moqaudio*/moqvideo* here —
# 206 functions where the Apple artifact has 230. That is why the
# bindings are generated from the object (`just gen-moq`) and not
# from the C header the release ships, which describes the Apple one.
moqFfi =
let
version = "0.3.17";
target = {
"x86_64-linux" = "x86_64-unknown-linux-gnu";
"aarch64-linux" = "aarch64-unknown-linux-gnu";
}.${pkgs.stdenv.hostPlatform.system};
hash = {
"x86_64-linux" = "sha256-dzQXpV4JgdtD+g33WX51FFAQdfCUXkNsx1xPbobPfUI=";
"aarch64-linux" = "sha256-PdzRwbJFqOZWRgI0HHX2XUH+Ljh4V3jvQ9asfvCuIPA=";
}.${pkgs.stdenv.hostPlatform.system};
in
pkgs.stdenv.mkDerivation {
pname = "libmoq-ffi";
inherit version;
src = pkgs.fetchurl {
url = "https://github.com/kixelated/moq/releases/download/moq-ffi-v${version}/moq-ffi-${version}-${target}-libmoq_ffi.so";
inherit hash;
};
dontUnpack = true;
# It carries no RUNPATH and needs libgcc_s, libm and libc — the
# host's on an ordinary distro, and nothing at all on NixOS
# unless they are bound here.
nativeBuildInputs = [ pkgs.autoPatchelfHook ];
buildInputs = [ pkgs.stdenv.cc.cc.lib ];
installPhase = ''
mkdir -p $out/lib
cp $src $out/lib/libmoq_ffi.so
chmod +w $out/lib/libmoq_ffi.so
'';
};
# One directory for the loader to look in. jolt resolves every
# :jolt/native name against JOLT_NATIVE_LIB, and the objects now come
# from two places — jolt-native's flake, and the moq-ffi release — so
# they are joined rather than the path being made a list, which the
# loader does not take.
# The C codecs, from nixpkgs. libmoq_ffi carries the transport and
# nothing else — moq-ffi's `audio` and `video` features would have
# brought Opus and H.264 with them, at the price of compiling a
# 1062-crate workspace — so the codecs are linked here instead,
# where they have always lived.
#
# Named in :jolt/native, so the loader resolves them the same way it
# resolves libvidya: by name, out of one directory.
# A flat C face for openh264, because openh264 has none. Its
# `ISVCEncoder` is `const ISVCEncoderVtbl*` — every method is a
# function pointer in a vtable — and jolt.ffi cannot call one: Chez
# fixes a foreign procedure's types when it compiles it, and the
# target must be a literal C symbol name. So the vtable is walked in
# c/frq_h264.c and jolt binds the five plain symbols it exports.
#
# One translation unit against a library nixpkgs already has. It is
# a calling convention adapter, not a second media plane, and the
# distinction from the moq-ffi build it replaces is the whole point:
# this compiles one .c file, not a 1062-crate workspace.
frqH264 = pkgs.stdenv.mkDerivation {
pname = "frq-h264";
version = "0.1";
src = ./c;
nativeBuildInputs = [ pkgs.pkg-config ];
buildInputs = [ pkgs.openh264 ];
buildPhase = ''
$CC -O2 -fPIC -shared frq_h264.c -o libfrqh264.so \
$(pkg-config --cflags --libs openh264)
'';
installPhase = ''
mkdir -p $out/lib && cp libfrqh264.so $out/lib/
'';
};
# openh264 is here for frqH264's DT_NEEDED; alsa-lib for capture
# and playback. V4L2 needs nothing: it is ioctls against libc and
# the kernel, so there is no library to name.
# No SDL any more: it was jvui's, declared in jvui's own
# :jolt/native and dlopened by soname. libcosmic paints through wgpu
# and takes what it needs from `runtimeLibs` instead.
codecs = [ pkgs.libopus pkgs.openh264 frqH264 pkgs.alsa-lib ];
# ALSA's PipeWire plugin, which is how `default` resolves to
# anything on a machine running PipeWire — and every machine frq
# targets does. Without it alsa-lib fails to dlopen
# libasound_module_pcm_pipewire.so and the only devices that open
# are raw hardware ones, which PipeWire is already holding.
#
# An environment variable rather than a library in the join:
# alsa-lib looks plugins up by directory, not by soname.
alsaPluginDir = "${pkgs.pipewire}/lib/alsa-lib";
nativeAll = pkgs.symlinkJoin {
name = "frq-native";
paths = [ native moqFfi ] ++ codecs;
};
# Jolt itself: Clojure on Chez, built the way its own flake builds it.
#
# Still a function taking its source, though there is only one of
# them now: the second was the Bionic-addrinfo fork the APK's boot
# image carried, and there is no jolt APK any more — the phone is
# ClojureDart and Flutter, and jolt does not run there at all.
joltFrom = src: pkgs.stdenv.mkDerivation {
pname = "jolt";
version = "dev";
inherit src;
strictDeps = true;
nativeBuildInputs = with pkgs; [ chez makeWrapper pkg-config xxd ];
buildInputs = with pkgs; [ lz4 zlib ncurses openssl libuuid ];
JOLT_VERSION = "dev";
dontConfigure = true;
buildPhase = ''
runHook preBuild
scheme --script host/chez/build-jolt.ss release target/release/jolt
runHook postBuild
'';
installPhase = ''
runHook preInstall
mkdir -p "$out/bin"
install -m755 target/release/jolt "$out/bin/jolt"
runHook postInstall
'';
# jolt.deps shells out to git and unzip, and jolt.mvn-http dlopens
# OpenSSL through the JOLT_OPENSSL_LIBDIR seam. gitMinimal rather
# than git: all jolt.deps asks for is clone/fetch/rev-parse, and
# the full package carries Perl and Python for the subcommands
# written in them — a quarter of a gigabyte for git-send-email.
#
# TZDIR so a zone *name* resolves wherever this runs: frq.clock
# hands one to tzset, and glibc then looks for the tzfile under
# /usr/share/zoneinfo unless told otherwise — which a NixOS host
# does not have. The store's own tzdata is there on both kinds of
# machine. --set-default, so a TZDIR the user set still wins.
postFixup = ''
wrapProgram "$out/bin/jolt" \
--prefix PATH : "${pkgs.lib.makeBinPath [ pkgs.gitMinimal pkgs.unzip ]}" \
--set-default JOLT_OPENSSL_LIBDIR "${pkgs.lib.makeLibraryPath [ pkgs.openssl ]}" \
--set-default TZDIR "${pkgs.tzdata}/share/zoneinfo" \
--set-default SSL_CERT_FILE "${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt"
'';
};
joltRuntime = joltFrom jolt-src;
# The backends' Clojure halves, which live inside the jolt-native
# checkout beside the objects they bind. Their own deps.edn asks for
# glimmer by git — the top-level override below answers for both.
glimmerCosmic = "${jolt-native}/glimmer-backends/glimmer-cosmic";
glimmerTui = "${jolt-native}/glimmer-backends/glimmer-tui";
runtimeLibs = runtimeLibsFor pkgs;
# The project as jolt sees it: source, deps.edn, nothing else.
frqSource = pkgs.runCommand "frq-source" { } ''
mkdir -p "$out"
cp -r ${self}/common ${self}/src ${self}/deps.edn "$out/"
'';
# Jolt resolves deps.edn from the working directory, so the launcher
# runs from the store copy. Its .jolt/cpcache write lands on a
# read-only directory and jolt treats that as a quiet cache miss, so
# the only cost is re-resolving the (already local) graph per start.
frqScript = pkgs.writeShellScript "frq" ''
export LD_LIBRARY_PATH="${nativeAll}/lib:${lib.makeLibraryPath runtimeLibs}''${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}"
export ALSA_PLUGIN_DIR="${alsaPluginDir}"
cd ${frqSource}
# On NixOS the store's Mesa is the system's and the window opens.
# Anywhere else the real driver is the host's, so defer to nixGL —
# it prepends the host driver, which has to win over ours.
runner=""
[ -e /run/current-system ] || runner="${nixGL}/bin/nixGLIntel"
exec ''${runner} ${joltRuntime}/bin/jolt \
-Sdeps '{:deps {jolt-lang/glimmer {:local/root "${glimmer}"} nandi/glimmer-cosmic {:local/root "${glimmerCosmic}"}}}' \
-m frq.cosmic "$@"
'';
# The same source, the other backend. No GL, no nixGL and no X11 —
# a terminal is the one surface that needs nothing from the host but
# a terminal, which is the reason this output exists.
tuiScript = pkgs.writeShellScript "frq-tui" ''
export LD_LIBRARY_PATH="${nativeAll}/lib''${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}"
export ALSA_PLUGIN_DIR="${alsaPluginDir}"
cd ${frqSource}
exec ${joltRuntime}/bin/jolt \
-Sdeps '{:deps {jolt-lang/glimmer {:local/root "${glimmer}"} nandi/glimmer-tui {:local/root "${glimmerTui}"}}}' \
-m frq.tui "$@"
'';
tui = pkgs.runCommand "frq-tui-0.1.0"
{
meta = {
description = "frq's screens in a terminal";
mainProgram = "frq-tui";
platforms = systems;
};
}
''
mkdir -p "$out/bin"
ln -s ${tuiScript} "$out/bin/frq-tui"
'';
frq = pkgs.runCommand "frq-0.1.0"
{
meta = {
description = "A freeq client in jolt";
mainProgram = "frq";
platforms = systems;
};
}
''
mkdir -p "$out/bin"
ln -s ${frqScript} "$out/bin/frq"
'';
in
{
inherit native moqFfi frqH264 nativeAll frq;
inherit (pkgs) pipewire;
inherit tui;
jolt = joltRuntime;
default = frq;
# The Android SDK `just apk` copies into flutter/.home. A package
# rather than something the recipe evaluates inline, so that
# `nix build .#android-sdk` is how you pre-warm it and `nix flake
# show` admits it exists.
android-sdk = androidSdkFor pkgs.stdenv.hostPlatform.system;
# frq and everything it loads, squashed into one runnable file for
# hosts without Nix. The whole closure rides along — Mesa included,
# which is not waste: off NixOS the launcher goes through nixGL, and
# nixGL needs a store Mesa to put the host's driver in front of.
appimage =
nix-appimage.bundlers.${pkgs.stdenv.hostPlatform.system}.default frq;
# The other desktop GUI, squashed the same way. `flutter-desktop` is
# already the nixGL-wrapped launcher rather than the raw Flutter
# bundle, so this carries the same store Mesa for the same reason —
# and it is the whole point here, since a host with Flutter's
# runtime deps but no Nix is exactly who wants one file.
#
# Named by its backend, the way the outputs it wraps are: `appimage`
# is libcosmic's and this is Flutter's, and neither is the default.
flutter-appimage =
nix-appimage.bundlers.${pkgs.stdenv.hostPlatform.system}.default
self.packages.${pkgs.stdenv.hostPlatform.system}.flutter-desktop;
# Everything `clojure -M:cljd compile` would otherwise reach the
# network for, fetched once and hashed.
#
# The compile needs three caches, and the reason this is one
# derivation rather than three is that only one of them is obvious.
# Maven and gitlibs are the ordinary tools.deps pair. The third is
# ClojureDart's own: `ensure-cljd-analyzer!` writes a *second*, whole
# pub project to `.clojuredart/cache/<cljd sha>/cljd_helper`, runs
# `pub add analyzer` in it, and then runs `bin/analyzer.dart` out of
# it for the duration of the compile — so a sandbox needs that
# project already resolved, not just the app's dependencies.
#
# Fixed-output, so it is allowed the network the rest of the build is
# not. What that costs is a hash to maintain, and the thing worth
# being exact about is *when*: this derivation never sees frq's
# source. It compiles a three-line throwaway project against the same
# `flutter/deps.edn` and the same `flutter/pubspec.yaml`, so the hash
# moves when a dependency moves and not when a screen changes. A
# stub, rather than `-P` and a hand-built analyzer dir, because
# running the real compiler once is the only way to be sure the
# caches are the ones it actually wants.
#
# PUB_CACHE lands in $out on purpose. The package_config.json inside
# cljd_helper carries absolute paths to whatever resolved it, so
# resolving into a build directory would bake in paths that stop
# existing the moment this derivation finishes. Pointed at $out they
# are store paths, and still true.
cljd-deps =
let
flutterPkg = pkgs.flutter;
in
pkgs.stdenvNoCC.mkDerivation {
name = "frq-cljd-deps";
dontUnpack = true;
nativeBuildInputs = [
pkgs.clojure
pkgs.jdk17
flutterPkg
pkgs.git
pkgs.cacert
];
buildCommand = ''
export HOME="$NIX_BUILD_TOP/home"
# Resolved in the build directory and copied to $out at the
# end, never written there directly. A fixed-output derivation
# may not reference a store path and its own output is a store
# path, so pub writing its cache's absolute location into its
# own metadata is enough to fail the check.
cache="$NIX_BUILD_TOP/cache"
export PUB_CACHE="$cache/pub-cache"
export GITLIBS="$cache/gitlibs"
export SSL_CERT_FILE="${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt"
mkdir -p "$HOME" "$PUB_CACHE" "$GITLIBS" "$cache/m2"
# The stub: our dependency files, nothing of our source.
# ../common is a :local/root dependency now, so it has to exist
# *and* carry a deps.edn for tools.deps to resolve — an empty
# directory with that one file in it is enough.
proj="$NIX_BUILD_TOP/stub"
mkdir -p "$proj/src/stub" "$NIX_BUILD_TOP/common"
cp ${./common/deps.edn} "$NIX_BUILD_TOP/common/deps.edn"
cp ${./flutter/deps.edn} "$proj/deps.edn"
cp ${./flutter/pubspec.yaml} "$proj/pubspec.yaml"
# The lock, or `pub get` resolves against pub.dev and takes
# whatever satisfies the ranges today. Every build then fetches
# a slightly different set and the fixed-output hash is a
# promise nothing can keep.
cp ${./flutter/pubspec.lock} "$proj/pubspec.lock"
chmod u+w "$proj/deps.edn" "$proj/pubspec.yaml" "$proj/pubspec.lock"
cat > "$proj/src/stub/main.cljd" <<'EOF'
(ns stub.main)
(defn main [] nil)
EOF
cd "$proj"
# `:main` has to name the stub, or the compiler goes looking for
# frq.main in a tree that is not here.
sed -i 's/:main frq\.main/:main stub.main/' deps.edn
flutter config --no-analytics &>/dev/null || true
flutter config --enable-linux-desktop >/dev/null || true
clojure -Sdeps '{:mvn/local-repo "'"$cache"'/m2"}' -M:cljd compile
# What the compile left behind, and only that. The analyzer
# project is keyed by the ClojureDart sha, so the directory
# under cache/ is copied wholesale rather than named here.
mkdir -p "$out/clojuredart"
cp -r .clojuredart/cache "$out/clojuredart/cache"
cp -r "$cache/m2" "$out/m2"
cp -r "$cache/gitlibs" "$out/gitlibs"
cp -r "$PUB_CACHE" "$out/pub-cache"
# A fixed-output derivation may not reference a store path, and
# a resolved pub project is nothing but store paths:
# package_config.json names the Flutter SDK and every package
# in the cache by absolute path. So the analyzer project ships
# *unresolved* — its pubspec and its analyzer.dart and nothing
# else — and `flutter pub get --offline` re-resolves it against
# this cache at build time, where naming the store is allowed.
find "$out" \( -name '.dart_tool' -o -name '.flutter-plugins' \
-o -name '.flutter-plugins-dependencies' \) -prune -exec rm -rf {} +
find "$out" -name '.packages' -delete
# A fixed-output hash is a promise that two runs agree, so
# everything a tool writes *about* a run rather than about a
# dependency has to go: pub's log carries timestamps, Maven
# rewrites its resolution metadata on every resolve, and
# tools.gitlibs keeps bare clones it only needs in order to
# make a checkout. None of it is read offline.
#
# active_roots is the one that was actually breaking this. Pub
# records the project directories using the cache, sharded by
# a hash of the path, and $NIX_BUILD_TOP is different on every
# run -- so two builds whose hosted/ trees were byte-identical
# still disagreed, purely over which directory had asked. Four
# builds gave four hashes until this went.
rm -rf "$out/pub-cache/log" "$out/pub-cache/_temp" \
"$out/pub-cache/git" "$out/pub-cache/global_packages" \
"$out/pub-cache/bin" "$out/pub-cache/active_roots"
# tools.gitlibs keeps a bare clone per URL under _repos/, and a
# bare clone is packfiles — which two runs of the same fetch do
# not have to produce byte for byte. It cannot simply be
# deleted, because `procure` calls `ensure-git-dir` before it
# looks at anything else and would clone it again, over a
# network this has and the build that uses it does not.
#
# It does not need the objects, though. `procure` finds the sha
# with `match-exact` against the checkout already in libs/, so
# the bare repo only has to exist. Emptied and re-initialised,
# it is a fixed handful of files from the pinned git and the
# same on every run.
find "$out/gitlibs/_repos" -name HEAD | while read -r head; do
repo="$(dirname "$head")"
rm -rf "$repo"
git init --bare -q "$repo"
# The sample hooks are shell scripts, so they carry a
# `#!/nix/store/.../bash` line — which is exactly the kind of
# store reference a fixed-output derivation may not hold. An
# empty bare repo nothing ever runs has no use for them.
rm -rf "$repo/hooks"
done
# pub's version listings, which record when they were fetched.
# This is the one that actually moved between two runs of this
# derivation: the package sources under hosted/ were identical
# and the listings beside them were not. Nothing offline reads
# them — a resolution that already has every package on disk
# never asks pub.dev what versions exist.
find "$out/pub-cache" -name '.cache' -type d -prune -exec rm -rf {} +
find "$out/m2" \( -name '*.lastUpdated' -o -name '_remote.repositories' \
-o -name 'resolver-status.properties' -o -name '*.part' \
-o -name 'maven-metadata-*.xml*' \) -delete
find "$out" \( -name '.DS_Store' -o -name '*.log' -o -name '.git' \) \
-prune -exec rm -rf {} +
find "$out" -type d -empty -delete
chmod -R u+w "$out"
# Last, after every cleanup above: anything still naming the
# store fails the fixed-output check, and the error names one
# path out of thousands of files. This names the files.
if refs="$(grep -rlI /nix/store "$out" 2>/dev/null)" && [ -n "$refs" ]; then
echo "cljd-deps: these still reference the store:" >&2
echo "$refs" | head -20 >&2
fi
# If two runs disagree, this says which half to look in. Cheap,
# and the alternative is a hash mismatch with nothing attached.
for d in "$out"/*; do
echo "cljd-deps subtree $(basename "$d") $( (cd "$d" && find . -type f \
-exec sha256sum {} + | sort -k2 | sha256sum) )" >&2
done
for d in "$out"/pub-cache/*/*; do
[ -d "$d" ] || continue
# The path relative to $out, not the basename: two runs that
# disagree here disagree about *which* directory exists, and
# a bare `09` names nothing you can go and look at.
echo "cljd-deps pub ''${d#$out/} $( (cd "$d" && find . -type f \
-exec sha256sum {} + | sort -k2 | sha256sum) )" >&2
done
'';
outputHashMode = "recursive";
outputHashAlgo = "sha256";
# Moves when flutter/deps.edn or flutter/pubspec.yaml move, and
# not when frq's own source does — see the stub above.
outputHash = "sha256-qSGx7WFdVyV7yu4R+EjiQHZcLqwDjYSlohiZcXB43DY=";
};
# The Flutter desktop GUI, built rather than run out of the tree.
#
# `just flutter-desktop` is the working-tree loop and this is its
# opposite number, the same way `nix build .#frq` is `just cosmic
# run`'s: the source is the flake's, the output is a store path, and the build is
# a sandbox with no network. It is the first thing here that builds
# purely — the APK cannot, because Gradle fetches as it goes.
#
# Two stages, because the Dart does not exist until ClojureDart writes
# it. `preBuild` runs the compiler over `flutter/src` and `common/`
# with `--offline`, out of the caches `cljd-deps` fetched; everything
# after that is an ordinary Flutter application as far as nixpkgs is
# concerned.
#
# The caches are copied in rather than used where they lie. Maven,
# tools.gitlibs and pub all expect to be able to write to their own
# cache — a lock file, a resolved marker — and the store is read-only,
# so pointing them at $out of a fixed-output derivation fails in three
# different ways at three different depths.
#
# `src` is the whole tree and not `flutter/`: `flutter/deps.edn` puts
# `../common` on the classpath, which is the entire point of that
# directory, and a source root of `flutter/` would leave the screens
# outside it.
flutter-desktop-unwrapped = pkgs.flutter.buildFlutterApplication rec {
pname = "frq-flutter";
version = "0.1.0";
src = lib.cleanSourceWith {
src = ./.;
# Two trees, and only two: `flutter/` is the app and `common/`
# is the screens its deps.edn puts on the classpath. The root is
# still the source root because of that `../common`, but letting
# the *whole* root in means every file in the repo is an input —
# so editing flake.nix, or CLAUDE.md, or the jolt half in `src/`,
# invalidated the entire Dart compile and paid ten minutes for a
# change the Flutter build cannot even see.
#
# Matched on the path relative to the root rather than on
# basename: `src` as a basename would also exclude `flutter/src`
# and `common/src`, which is everything that matters.
filter =
let root = toString ./.; in
path: type:
let
rel = lib.removePrefix (root + "/") (toString path);
inTree = d: rel == d || lib.hasPrefix (d + "/") rel;
in
(inTree "flutter" || inTree "common")
# Build trees and caches, which are large, machine-specific
# and would make every one of them a new store path.
&& !(builtins.elem (baseNameOf path) [
"build" ".home" ".clojuredart" ".cpcache" "cljd-out"
".dart_tool" "result" ".git" ".jolt" "buck-out"
]);
};
sourceRoot = "source/flutter";
# Read at eval time, so the lock in git is the lock that is built.
autoPubspecLock = ./flutter/pubspec.lock;
# git, because tools.deps resolves the ClojureDart dependency through
# tools.gitlibs even when every byte of it is already on disk — see
# the _repos note in cljd-deps.
nativeBuildInputs = [ pkgs.clojure pkgs.jdk17 pkgs.git ];
preBuild = ''
export PUB_CACHE="$NIX_BUILD_TOP/pub-cache"
export GITLIBS="$NIX_BUILD_TOP/gitlibs"
cp -r ${self.packages.${pkgs.stdenv.hostPlatform.system}.cljd-deps}/pub-cache "$PUB_CACHE"
cp -r ${self.packages.${pkgs.stdenv.hostPlatform.system}.cljd-deps}/gitlibs "$GITLIBS"
cp -r ${self.packages.${pkgs.stdenv.hostPlatform.system}.cljd-deps}/m2 "$NIX_BUILD_TOP/m2"
mkdir -p .clojuredart
cp -r ${self.packages.${pkgs.stdenv.hostPlatform.system}.cljd-deps}/clojuredart/cache .clojuredart/cache
chmod -R u+w "$PUB_CACHE" "$GITLIBS" "$NIX_BUILD_TOP/m2" .clojuredart
# Resolve the analyzer project here rather than in cljd-deps,
# which was not allowed to name the store. Offline, out of the
# cache that derivation did fetch. ClojureDart only reaches for
# the network when `bin/analyzer.dart` is missing, and it is not.
for helper in .clojuredart/cache/*/cljd_helper; do
( cd "$helper" && flutter pub get --offline )
done
# --offline is what keeps `pub get` out of a sandbox that has no
# network; the analyzer project it would otherwise resolve is
# already in .clojuredart, put there by cljd-deps.
clojure -Sdeps "{:mvn/local-repo \"$NIX_BUILD_TOP/m2\"}" \
-M:cljd compile --offline
'';
meta = {
description = "frq's screens on Flutter's Linux target (no GL launcher)";
mainProgram = "frq";
platforms = systems;
};
};
# The same shape as `frq` above: a launcher, and a package that is a
# symlink to it. The reason is the same one `frqScript` gives — on
# NixOS the store's Mesa is the system's and the window opens, and
# anywhere else the real driver is the host's, so the process is
# handed to nixGL. Without it the store build dies on a distrobox
# Arch with "No provider of eglGetPlatformDisplayEXT found", which is
# that failure wearing an EGL hat.
#
# A wrapper *around* the built application rather than a `postFixup`
# inside it, because buildFlutterApplication's own dartFixupHook runs
# after postFixup and rewrites `bin/frq` — so anything done to that
# path from inside is undone on the way out.
flutter-desktop =
let
unwrapped =
self.packages.${pkgs.stdenv.hostPlatform.system}.flutter-desktop-unwrapped;
# buildFlutterApplication's own wrapper appends a bare `/lib` to
# LD_LIBRARY_PATH — the host's, not the bundle's. Off NixOS that
# is a foreign library directory in front of nothing, and the app
# dies in the loader before main: first
#
# /lib/libc.so.6: undefined symbol: __pointer_chk_guard
#
# and, once the store's glibc is put ahead of it,
#
# libc.so.6: version `GLIBC_2.43' not found
# (required by /lib/libglib-2.0.so.0)
#
# which is the same bug wearing the other hat: the host's glib
# against the store's glibc. Ordering cannot fix a mixture, so
# the entry goes rather than moves. The wrapper is generated, so
# this edits a copy and asserts the edit landed — a silent miss
# here is a runtime failure on someone else's machine.
fixed = pkgs.runCommand "frq-flutter-wrapper" { } ''
mkdir -p "$out/bin"
sed "s|'/lib'||g" ${unwrapped}/bin/frq > "$out/bin/frq"
chmod +x "$out/bin/frq"
if grep -q "'/lib'" "$out/bin/frq"; then
echo "the /lib entry outlived the edit; look at the wrapper" >&2
exit 1
fi
'';
script = pkgs.writeShellScript "frq" ''
runner=""
[ -e /run/current-system ] || runner="${nixGLFor pkgs}/bin/nixGLIntel"
exec ''${runner} ${fixed}/bin/frq "$@"
'';
in
pkgs.runCommand "frq-flutter-0.1.0"
{
meta = {
description = "frq's screens on Flutter's Linux target";
mainProgram = "frq";
platforms = systems;
};
}
''
mkdir -p "$out/bin"
ln -s ${script} "$out/bin/frq"
'';
});
# Where `just cosmic run` runs, and — because entering it realises what it
# names — what builds the half of frq that is not this working tree.
#
# The two halves, and the split is the whole point of the shell. The frq
# source is the files on disk, uncommitted edits and all. Everything
# under it — jolt, glimmer, glimmer-vidya, both native objects — is the
# flake's, at the revs flake.lock names, so a run says what it ran
# against and both halves of glimmer-vidya move together. That is the
# drift the `jolt-native` input's comment is about, and a pin frq can
# answer for is worth more here than the convenience of a checkout.
#
# `native` is jolt-native's own flake output. It was a buck2 graph when
# this comment was first written and a cargo build restated here when it
# was second: buck2 fetches its rustc, zig and every third-party crate as
# it goes and writes buck-out into the tree it builds, so a sandbox with
# no network and a read-only store was the one place it could not run.
# Upstream builds with nix now, so the thing its CI runs and the thing
# this shell hands a builder are the same derivation.
#
# Nothing here says "nixbuild", though: it is a plain derivation, and
# where it gets built is the machine's business. The `cosmic` recipe asks for
# the shell with --max-jobs 0, which is what sends it to the `builders`
# entry rather than compiling egui on a laptop.
devShells = forEachSystem (pkgs:
let
inherit (pkgs) lib;
inherit (self.packages.${pkgs.stdenv.hostPlatform.system}) jolt native nativeAll;
in
{
default = pkgs.mkShellNoCC {
name = "frq";
# jolt, because the runtime frq is run by should be the flake's
# too. nixGL for the same reason the launcher reaches for it — see
# frqScript. just so the recipe runner comes from here too rather
# than the host — `nix develop` and then `just cosmic run` is the
# whole of what a machine with nix needs.
packages = [ jolt pkgs.just (nixGLFor pkgs) ];
# Read by the recipes rather than baked into a wrapper: the frq
# source `just cosmic run` runs is the working tree, so the
# launcher has to live in that tree and the shell has to hand it its answers.
# Naming these is also what makes the shell build them.
JOLT_NATIVE_LIB = "${nativeAll}/lib";
# Spelled out rather than shared with the packages block, which
# is a different `let`. See `alsaPluginDir` there for why.
ALSA_PLUGIN_DIR = "${pkgs.pipewire}/lib/alsa-lib";
GLIMMER_SRC = glimmer;
GLIMMER_COSMIC_SRC = "${jolt-native}/glimmer-backends/glimmer-cosmic";
GLIMMER_TUI_SRC = "${jolt-native}/glimmer-backends/glimmer-tui";
FRQ_LIB_PATH = lib.makeLibraryPath (runtimeLibsFor pkgs);
NIXGL = "${nixGLFor pkgs}/bin/nixGLIntel";
# A checkout of jolt-native in place of the pin, when one is NAMED.
#
# The pin is a rev on a server, so the loop for a change to a
# backend would be commit, push, re-pin, re-lock — four steps and
# an upload for a line of Rust. Pointing FRQ_JOLT_NATIVE at a
# working copy makes the loop `cargo build` and `just tui`.
#
# This used to find that copy by itself — ../jolt-native beside the
# checkout — and that is gone, because a found tree is the wrong
# default twice over. It fired on a sibling nobody had asked about,
# so a shell could be running something other than the pin on the
# strength of a directory existing. And what it prepended was a raw
# `cargo build` artifact: no store RUNPATH, so its libc.so.6
# resolves to the host's, and the Nix-glibc jolt that dlopens it
# gets a second libc and fails. jolt reports that as "required
# native library ... not found", which names neither libc nor the
# tree the object came from. An override worth having is one you
# can see in the command you typed.
#
# So: named or nothing. A named tree is taken even unbuilt (with a
# word about what to run) — naming it is asking for it — and it has
# to carry the RUNPATH the store copy does, which in practice means
# building it under Nix.
#
# Only the sources and the objects a checkout actually builds move.
# Everything else on the library path — libopus, libmoq_ffi, the
# ALSA plugins — stays the pin's, since a checkout has no build of
# those to offer.
shellHook = ''
if [ -n "''${FRQ_JOLT_NATIVE:-}" ]; then
if [ -d "$FRQ_JOLT_NATIVE/crates/jolt-tui" ]; then
FRQ_JOLT_NATIVE="$(cd "$FRQ_JOLT_NATIVE" && pwd)"
export FRQ_JOLT_NATIVE
export GLIMMER_TUI_SRC="$FRQ_JOLT_NATIVE/glimmer-backends/glimmer-tui"
export GLIMMER_COSMIC_SRC="$FRQ_JOLT_NATIVE/glimmer-backends/glimmer-cosmic"
# First, so a cargo build wins over the pin's copy of the
# same object. The rest of the pin's lib directory is still
# behind it.
export JOLT_NATIVE_LIB="$FRQ_JOLT_NATIVE/target/release:$JOLT_NATIVE_LIB"
echo "frq: jolt-native from $FRQ_JOLT_NATIVE, not the pin (unset FRQ_JOLT_NATIVE for the pin)" >&2
if [ ! -e "$FRQ_JOLT_NATIVE/target/release/libjolttui.so" ]; then
echo "frq: no libjolttui.so there yet — cargo build --release --features terminal -p jolt-tui" >&2
fi
else
echo "frq: FRQ_JOLT_NATIVE=$FRQ_JOLT_NATIVE is not a jolt-native checkout; using the pin" >&2
fi
fi
'';
};
# The APK toolchain, which the default shell deliberately does not
# carry: Flutter brings its own Dart, Gradle and a JDK's worth of
# closure, and a desktop build has no use for any of it.
#
# `just apk` used to name these as `nix shell nixpkgs#clojure
# nixpkgs#jdk17 nixpkgs#flutter`, which is the flake registry's
# nixpkgs and not this flake's — so the Flutter under the APK
# floated while everything else was locked. Same three packages,
# from flake.lock now.
#
# JDK 17 and not newer on purpose: the Flutter template's Gradle
# plugin pins a Gradle that rejects a JDK it was released before,
# and the failure reads as an unsupported class file version rather
# than as a version mismatch.
flutter = pkgs.mkShellNoCC {
name = "frq-flutter";
# git, because tools.deps resolves the ClojureDart dependency
# through tools.gitlibs even when every byte of it is already in
# the seeded cache — the same reason flutter-desktop-unwrapped
# names it. The host's git has always been there to answer; naming
# it means the shell does not depend on that.
packages = [ pkgs.clojure pkgs.jdk17 pkgs.flutter pkgs.just pkgs.git ];
# Where the recipe copies from. Naming it here is also what makes
# entering the shell build it, so the first `just apk` does not
# stop for a few hundred megabytes of SDK with nothing said about
# why.
FRQ_ANDROID_SDK =
"${androidSdkFor pkgs.stdenv.hostPlatform.system}/libexec/android-sdk";
# The Maven, gitlibs and pub caches the ClojureDart compile would
# otherwise fetch, plus the analyzer project it writes under
# .clojuredart. Here for both of FRQ_ANDROID_SDK's reasons: it is
# where the recipe copies from, and naming it is what makes
# entering the shell build it.
#
# The compile still runs online. These are a warm start and not a
# pin — `--offline` would be, and would turn adding a line to
# flutter/deps.edn into a re-hash of cljd-deps before anything
# compiled again. The sandbox build takes that trade because it
# has no network; the loop someone edits in should not.
FRQ_CLJD_DEPS = "${self.packages.${pkgs.stdenv.hostPlatform.system}.cljd-deps}";
};
# The other desktop GUI. Same ClojureDart half as the APK — one
# `clojure -M:cljd compile`, one flutter/src — over Flutter's Linux
# target instead of its Android one, so `flutter/linux/` is the
# runner and CMake and Ninja are the build rather than Gradle.
#
# A separate shell from `flutter` rather than one that carries both,
# because the halves are disjoint: this wants GTK and a C++ toolchain
# and no JDK, and the APK wants a JDK and an SDK and no GTK. Sharing
# them would mean every desktop build paying for a few hundred
# megabytes of Android SDK it never opens, which is the same argument
# that keeps Flutter out of the default shell.
#
# mkShell and not mkShellNoCC, unlike every other shell here: this is
# the one that actually compiles C++. stdenv brings the compiler, and
# gtk3 in buildInputs is what puts its .pc file where the runner's
# `pkg_check_modules(GTK gtk+-3.0)` can find it.
flutter-desktop = pkgs.mkShell {
name = "frq-flutter-desktop";
# clojure and flutter are the APK shell's, and deliberately the
# same two: the Dart that runs here is generated by the same
# compiler from the same source, and a second Flutter version
# under it would be a second set of engine artifacts and a second
# answer to "does the phone build match the desktop one".
nativeBuildInputs = [
pkgs.clojure
pkgs.flutter
pkgs.just
pkgs.cmake
pkgs.ninja
pkgs.pkg-config
];
# gtk3 is the runner's own dependency; the rest are url_launcher's
# Linux implementation, which is a GTK plugin compiled into the
# bundle. path_provider needs nothing here — its Linux half is
# pure Dart over the XDG directories.
buildInputs = [ pkgs.gtk3 pkgs.glib ];
# Same reason `just cosmic run` reaches for it: Flutter paints
# through GL, and off NixOS the driver that can do that is the
# host's, not the store's. The recipe reads this exactly as
# `cosmic` does.
NIXGL = "${nixGLFor pkgs}/bin/nixGLIntel";
# The `flutter` shell's, deliberately the same one and for the
# same reason clojure and flutter are: the ClojureDart half of
# both builds is one compile over one deps.edn, so a second set of
# caches would be a second answer to what it resolved against.
# This recipe reads the variable directly — it is inside this
# shell before it does any of the work — where `just apk` reaches
# for the flake output itself.
FRQ_CLJD_DEPS = "${self.packages.${pkgs.stdenv.hostPlatform.system}.cljd-deps}";
# The recipe's re-entry test, the way JOLT_NATIVE_LIB is the
# default shell's. Nothing else sets it, so `just flutter-desktop`
# outside the shell re-enters and lands back on the same recipe —
# no flag to forget, and no second code path for someone who runs
# `nix develop .#flutter-desktop --command just flutter-desktop`
# by hand.
FRQ_FLUTTER_DESKTOP = "1";
};
# The third frontend, and the first that is not a window: the same
# ClojureDart half again, over Flutter's web target. `flutter build
# web` compiles the generated Dart with dart2js and writes a
# directory of HTML, JS and assets rather than an executable.
#
# The thinnest of the three shells, because the web target is the
# one that needs no host toolchain at all: no JDK and no SDK as the
# APK wants, no GTK and no C++ as the desktop one does, and no nixGL
# — the GL is the browser's problem and the browser is not ours.
# mkShellNoCC says so: nothing here compiles C.
#
# python3 is not a build input. It is `just flutter-web serve`: the
# output is a directory of static files and something has to hand it
# over HTTP, and the alternative — `flutter run -d web-server` —
# rebuilds rather than serving what was built, which is the wrong
# half of the loop when the build already happened in a container.
flutter-web = pkgs.mkShellNoCC {
name = "frq-flutter-web";
packages = [
pkgs.clojure
pkgs.flutter
pkgs.just
pkgs.git
pkgs.python3
];
# The `flutter` shell's caches, and deliberately the same ones for
# the same reason `flutter-desktop` shares them: all three targets
# are one `clojure -M:cljd compile` over one deps.edn, and a third
# set of caches would be a third answer to what it resolved
# against.
FRQ_CLJD_DEPS = "${self.packages.${pkgs.stdenv.hostPlatform.system}.cljd-deps}";
# The recipe's re-entry test, the way FRQ_FLUTTER_DESKTOP is the
# desktop one's.
FRQ_FLUTTER_WEB = "1";
};
});
apps = forEachSystem (pkgs: {
default = {
type = "app";
program = "${self.packages.${pkgs.stdenv.hostPlatform.system}.frq}/bin/frq";
};
tui = {
type = "app";
program = "${self.packages.${pkgs.stdenv.hostPlatform.system}.tui}/bin/frq-tui";
};
});
};
}
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