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Set EM_CACHE if needed in dev shell for GHCJS #2397

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Merged
merged 2 commits into from
Jun 30, 2025
Merged

Set EM_CACHE if needed in dev shell for GHCJS #2397

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28ec6de
Set EM_CACHE if needed in dev shell for GHCJS
hamishmack Jun 30, 2025
cd5a977
Update head.hackage
hamishmack Jun 30, 2025
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2 changes: 1 addition & 1 deletion modules/project-common.nix
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Original file line number Diff line number Diff line change
Expand Up @@ -21,7 +21,7 @@ with lib.types;
shell = mkOption {
type = submodule [
(import ./shell.nix { projectConfig = config; })
{ _module.args = { inherit (pkgs.haskell-nix) haskellLib; }; }
{ _module.args = { inherit pkgs; inherit (pkgs.haskell-nix) haskellLib; }; }
];
default = { };
description = ''
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20 changes: 19 additions & 1 deletion modules/shell.nix
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Expand Up @@ -63,7 +63,25 @@
};
shellHook = lib.mkOption {
type = lib.types.str;
default = "";
# Shell hook to set EM_CACHE to a writable temporary directory if not already set
default = lib.optionalString pkgs.stdenv.hostPlatform.isGhcjs ''
if [ -z "$EM_CACHE" ]; then
# Create a unique temporary directory using mktemp
EM_CACHE_DIR=$(mktemp -d -t emcache-ghcjs-XXXXXX)

# Copy the default Emscripten cache contents to the temporary directory
DEFAULT_EM_CACHE="${pkgs.pkgsBuildBuild.emscripten}/share/emscripten/cache"
if [ -d "$DEFAULT_EM_CACHE" ]; then
cp -r "$DEFAULT_EM_CACHE"/* "$EM_CACHE_DIR" 2>/dev/null || true
chmod -R u+w "$EM_CACHE_DIR"
fi

export EM_CACHE="$EM_CACHE_DIR"
echo "Set EM_CACHE to $EM_CACHE"
else
echo "EM_CACHE already set to $EM_CACHE"
fi
'';
};

# mkDerivation args
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2 changes: 1 addition & 1 deletion test/cabal.project.local
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Expand Up @@ -29,7 +29,7 @@ repository head.hackage.ghc.haskell.org
f76d08be13e9a61a377a85e2fb63f4c5435d40f8feb3e12eb05905edb8cdea89
26021a13b401500c8eb2761ca95c61f2d625bfef951b939a8124ed12ecf07329
7541f32a4ccca4f97aea3b22f5e593ba2c0267546016b992dfadcd2fe944e55d
--sha256: sha256-T8qW/tiaMGcxxxA4OXBQc07EYXjhYMXSXSgW0Zg3aRo=
--sha256: sha256-GDbFKWPkG3IXjgL3DEywVgnMvEMciBfMHdMjhIRFJK4=

repository ghcjs-overlay
url: https://raw.githubusercontent.com/input-output-hk/hackage-overlay-ghcjs/ffb32dce467b9a4d27be759fdd2740a6edd09d0b
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