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Add flake.nix #4328

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2cf2b4e
Nix expr: add flake.nix
SignalWalker May 22, 2025
5335d02
Nix expr: add apps output to flake.nix
SignalWalker May 22, 2025
77d09ef
Nix expr: update system list
SignalWalker May 22, 2025
d6493b5
Nix expr: remove answered todo comment
SignalWalker May 22, 2025
cca130f
Nix expr: add overlay output to `flake.nix`
SignalWalker May 22, 2025
216f6c8
Nix expr: use `lib.strings.hasPrefix`
SignalWalker May 23, 2025
b96005f
Nix expr: use description from README.md
SignalWalker May 23, 2025
d3bb171
Nix expr: remove formatter
SignalWalker May 23, 2025
34ef8f2
Nix expr: fix derivation import in overlay output
SignalWalker May 23, 2025
fbbb1af
Nix expr: remove redundant apps output from flake.nix
SignalWalker May 23, 2025
c5a21eb
Nix expr: remove overlay output
SignalWalker May 23, 2025
80c58dd
Nix expr: use `lib` instead of `std` in flake.nix
SignalWalker May 23, 2025
b9c2d44
Nix expr: use `github:NixOS/nixpkgs?ref=24.05` as nixpkgs input in fl…
SignalWalker May 23, 2025
05ef888
Nix expr: make `shellHook` an output of `default.nix`, make shells di…
SignalWalker May 23, 2025
1ddeff8
Nix expr: only output default devshell and devshells for latest packages
SignalWalker May 23, 2025
0524f61
Nix expr: add `isFlake` argument to `shellHook`
SignalWalker Nov 18, 2025
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31 changes: 26 additions & 5 deletions default.nix
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Original file line number Diff line number Diff line change
Expand Up @@ -150,9 +150,11 @@ in {
|| isVersionAtLeast "2.6" value.hawkSourceInfo.version))
];
latestVersionFrag = lib.head releaseFrags;
combined = pp // asmsFromReleaseArtifacts // releasesEmuHawkInstallables // {
inherit depsForHistoricalRelease populateHawkSourceInfo releaseTagSourceInfos;
inherit (emuhawk-local.assemblies) libretroCores;
combined = let
launchScriptsForLocalBuild = launchScriptsFor emuhawk-local.assemblies true;
in (pp // asmsFromReleaseArtifacts // releasesEmuHawkInstallables // {
inherit depsForHistoricalRelease populateHawkSourceInfo releaseTagSourceInfos launchScriptsForLocalBuild;
inherit (emuhawk-local.assemblies) libretroCores;
bizhawkAssemblies = pp.buildAssembliesFor (fillTargetOSDifferences hawkSourceInfoDevBuild);
"bizhawkAssemblies-${latestVersionFrag}" = pp.buildAssembliesFor
(fillTargetOSDifferences releaseTagSourceInfos."info-${latestVersionFrag}");
Expand All @@ -172,8 +174,27 @@ in {
IDEs = {
kate = [ kate omnisharp-roslyn ];
};
launchScriptsForLocalBuild = launchScriptsFor emuhawk-local.assemblies true;
};
shellHook = isFlake: drv: ''
export BIZHAWKBUILD_HOME='${builtins.toString ./.}'
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@YoshiRulz YoshiRulz May 23, 2025

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Wait does this work in Flakes?

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@SignalWalker SignalWalker May 25, 2025 •
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Oh, when evaluating as part of a flake, that ./. gets interpreted as a nix store path, so BIZHAWKBUILD_HOME is set to something like /nix/store/1igqk0g3q3bj6zhcfmrgzirzjsqbgpx9-source instead of something like /home/tasbot/bizhawk. That's fine for reading data, but the store is (usually) read-only, so $BIZHAWK_HOME doesn't work as-is (I assume).

I'm not really sure what the best way to solve this would be (especially in the case of someone doing something like nix develop github:tasemulators/bizhawk, since that would mean that the source dir only exists in the store).

nix develop sets environment variables for each of the derivation outputs (ex. $out), which might be useful. They're relative to the directory in which you invoke nix develop, though (ex. if you invoke nix develop ./.#emuhawk-latest in BizHawk/Dist, $out is set to BizHawk/Dist/outputs/out rather than BizHawk/outputs/out).

Do builds output to $BIZHAWKBUILD_HOME/output, or do they output to $BIZHAWK_HOME? If it's the latter, does anything expect $BIZHAWKBUILD_HOME to be writable? If things only expect to be able to write to $BIZHAWK_HOME, we could add an isFlake parameter to the shellHook function and export $BIZHAWK_HOME=$out, if we don't mind that $out isn't guaranteed to be relative to the project root.

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@YoshiRulz YoshiRulz May 25, 2025

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IMO it's fine to assume nix develop will only be called from the repo root, already checked-out.

BIZHAWKBUILD_HOME is used at build-time to locate the repo root (not for the main solution though). BIZHAWK_HOME is used at run-time, and it was mainly added for NixHawk so I don't think anything expects it to be writable, BUT it can't point to ${BizHawk-source}/output since that doesn't exist.

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@SignalWalker SignalWalker May 25, 2025

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Some scripts seem to expect to be able to find (and write to) $BIZHAWKBUILD_HOME/output, ex.:

BizHawk/waterbox/waterboxhost/build-debug.sh

Line 8 in caeb811

cp target/debug/libwaterboxhost.so "$BIZHAWKBUILD_HOME/output/dll"

For $BIZHAWK_HOME, could we just mkdir -p it in the launch script, since that and PathExtensions.cs seem to be the only places it gets used?

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@YoshiRulz YoshiRulz May 25, 2025

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You can do that, but again, it needs to exist and contain the assemblies and other assets. The launch script is essentially cd $BIZHAWK_HOME; mono ./EmuHawk.exe.

No-one is going to be using EmuHawk's dev shell to build WaterboxHost. It can get its own shell when I eventually package it.

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@SignalWalker SignalWalker May 25, 2025

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I mean, if the only thing we care about that uses it is the launch script, and we're assuming that nix develop is only being called from the repo root, then could we just do something like:

shellHook = isFlake: drv: ''
    export BIZHAWKBUILD_HOME="${builtins.toString ./.}"
    export BIZHAWK_HOME="${if isFlake then "$(pwd -P)" else "$BIZHAWKBUILD_HOME"}/output/"
    # ...
'';

As-is, if you're in a checked-out repo root, running Dist/BuildDebug.sh in nix develop seems to work completely fine and outputs to ${repo_root}/output (as in, not $BIZHAWKBUILD_HOME/output).

(This would mean, though, that the printf later on that tells the user where the build scripts are is misleading if you're in a flake, so I'll need to fix that.)

export BIZHAWK_HOME="${if isFlake then "$(pwd -P)" else "$BIZHAWKBUILD_HOME"}/output/"
ldLibPath='${lib.makeLibraryPath drv.buildInputs}' # for running tests
if [ -z "$LD_LIBRARY_PATH" ]; then
export LD_LIBRARY_PATH="$ldLibPath"
else
export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:$ldLibPath"
fi
alias discohawk-monort-local='${launchScriptsForLocalBuild.discohawk}'
alias emuhawk-monort-local='${launchScriptsForLocalBuild.emuhawk}'
case "$-" in *i*)
pfx="$(realpath --relative-to="$PWD" "$BIZHAWKBUILD_HOME")/"
if [ "$pfx" = "./" ]; then pfx=""; fi
printf "%s\n%s\n" \
"Run ''${pfx}Dist/Build{Debug,Release}.sh to build the solution. You may need to clean up with ''${pfx}Dist/CleanupBuildOutputDirs.sh." \
"Once built, running {discohawk,emuhawk}-monort-local will pull from ''${pfx}output/* and use Mono from Nixpkgs."
;;
esac
'';
});
in combined // lib.listToAttrs (lib.concatLists (builtins.map
(f: [
{ name = f "latest-bin"; value = combined.${f "${latestVersionFrag}-bin"}; }
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27 changes: 27 additions & 0 deletions flake.lock
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63 changes: 63 additions & 0 deletions flake.nix
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Original file line number Diff line number Diff line change
@@ -0,0 +1,63 @@
{
description = "EmuHawk is a multi-system emulator written in C#. As well as quality-of-life features for casual players, it also has recording/playback and debugging tools, making it the first choice for TASers (Tool-Assisted Speedrunners).";
inputs = {
nixpkgs.url = "github:NixOS/nixpkgs?ref=24.05";
};
outputs =
inputs@{ self, nixpkgs, ... }:
with builtins;
let
inherit (nixpkgs) lib;
systems = [
# this is currently the only supported system, according to https://github.com/TASEmulators/BizHawk/issues/1430#issue-396452488
"x86_64-linux"
];
nixpkgsFor = lib.genAttrs systems (
system:
import nixpkgs {
localSystem = builtins.currentSystem or system;
crossSystem = system;
overlays = [ ];
}
);
# import the derivations from default.nix for the given system & package set
importDefaultDerivationsWith =
system: pkgs:
# ./default.nix outputs some non-derivation attributes, so we have to filter those out
(lib.filterAttrs (name: val: lib.isDerivation val) (import ./default.nix { inherit system pkgs; }));
in
{
packages = mapAttrs (
system: pkgs:
(importDefaultDerivationsWith system pkgs)
// {
default = self.packages.${system}.emuhawk-latest-bin;
}
) nixpkgsFor;
devShells = mapAttrs (
system: pkgs:
let
avail = import ./default.nix { inherit system pkgs; };
mkShellCustom =
drv:
pkgs.mkShell {
packages = with pkgs; [
git
powershell
];
inputsFrom = [ drv ];
shellHook = avail.shellHook true drv;
};
in
{
bizhawkAssemblies-latest = mkShellCustom avail.bizhawkAssemblies-latest;
discohawk-latest = self.devShells.${system}.bizhawkAssemblies-latest;
emuhawk-latest = self.devShells.${system}.bizhawkAssemblies-latest;
default = pkgs.mkShell {
packages = [ avail.emuhawk.hawkSourceInfo.dotnet-sdk ];
inputsFrom = [ self.devShells.${system}.emuhawk-latest ];
};
}
) nixpkgsFor;
};
}
21 changes: 1 addition & 20 deletions shell.nix
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Original file line number Diff line number Diff line change
Expand Up @@ -25,26 +25,7 @@
++ lib.optionals useVSCode [] #TODO https://devblogs.microsoft.com/dotnet/csharp-dev-kit-now-generally-available/ https://learn.microsoft.com/en-us/training/modules/implement-visual-studio-code-debugging-tools/
;
inputsFrom = [ drv ];
shellHook = ''
export BIZHAWKBUILD_HOME='${builtins.toString ./.}'
export BIZHAWK_HOME="$BIZHAWKBUILD_HOME/output/"
ldLibPath='${lib.makeLibraryPath drv.buildInputs}' # for running tests
if [ -z "$LD_LIBRARY_PATH" ]; then
export LD_LIBRARY_PATH="$ldLibPath"
else
export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:$ldLibPath"
fi
alias discohawk-monort-local='${avail.launchScriptsForLocalBuild.discohawk}'
alias emuhawk-monort-local='${avail.launchScriptsForLocalBuild.emuhawk}'
case "$-" in *i*)
pfx="$(realpath --relative-to="$PWD" "$BIZHAWKBUILD_HOME")/"
if [ "$pfx" = "./" ]; then pfx=""; fi
printf "%s\n%s\n" \
"Run ''${pfx}Dist/Build{Debug,Release}.sh to build the solution. You may need to clean up with ''${pfx}Dist/CleanupBuildOutputDirs.sh." \
"Once built, running {discohawk,emuhawk}-monort-local will pull from ''${pfx}output/* and use Mono from Nixpkgs."
;;
esac
'';
shellHook = avail.shellHook false drv;
};
shells = lib.pipe avail [
(lib.mapAttrs (name: drv: if lib.hasPrefix "bizhawkAssemblies-" name then drv else drv.assemblies or null))
Expand Down