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Diffstat (limited to 'gleam/nix-gleam/default.nix')
| -rw-r--r-- | gleam/nix-gleam/default.nix | 280 |
1 files changed, 280 insertions, 0 deletions
diff --git a/gleam/nix-gleam/default.nix b/gleam/nix-gleam/default.nix new file mode 100644 index 0000000..d074263 --- /dev/null +++ b/gleam/nix-gleam/default.nix @@ -0,0 +1,280 @@ +{ + stdenv, + lib, + git, + xxhash, + fetchHex, + gleam, + beamPackages, + rsync, + nodejs, +}: let + inherit (builtins) fromTOML readFile; +in { + buildGleamApplication = { + src, + nativeBuildInputs ? [], + localPackages ? [], + erlangPackage ? beamPackages.erlang, + rebar3Package ? beamPackages.rebar3, + ... + } @ attrs: let + # gleam.toml contains an application name and version. + gleamToml = lib.importTOML (src + "/gleam.toml"); + + # manifest.toml contains a list of required packages including a sha256 checksum + # that can be used by nix fetchHex fetcher. + manifestToml = lib.importTOML (src + "/manifest.toml"); + + # Specify which target to build for. + buildTarget = attrs.target or gleamToml.target or "erlang"; + + # Generates a packages.toml expected by gleam compiler. + packagesTOML = with lib; + concatStringsSep "\n" ( + ["[packages]"] + ++ (map + (p: "${p.name} = \"${p.version}\"") + manifestToml.packages) + ++ (lib.optional (gitRecordsTOML != "") "") + ++ (lib.optional (gitRecordsTOML != "") gitRecordsTOML) + ); + + # Gleam records a git dependency twice: once in `[packages]`, + # and once in a `[git.<name>]` table with the commit. + # Without the second, Gleam will try to download it. + gitRecordsTOML = with lib; + concatMapStringsSep "\n" ( + p: "[git.${p.name}]\ncommit = \"${p.commit}\"" + ) (filterPackagesBySource "git" manifestToml.packages); + + # Helper function to filter manifest.toml packages + filterPackagesBySource = type: packages: lib.lists.filter (p: p.source == type) packages; + + gitDerivs = + map + (p: { + name = p.name; + derivation = fetchGit { + url = p.repo; + rev = p.commit; + }; + }) + (filterPackagesBySource "git" manifestToml.packages); + + # Fetch all dependencies + depsDerivs = + map + (p: { + name = p.name; + derivation = fetchHex { + inherit (p) version; + pkg = p.name; + sha256 = p.outer_checksum; + }; + }) + (filterPackagesBySource "hex" manifestToml.packages); + + # Find replacement paths for `local` package dependencies + # from `localPackages` list. + localDeps = let + # Build a lookup attrset for local packages. + localDerivs = lib.mergeAttrsList (map ( + p: let + name = (fromTOML (readFile (p + "/gleam.toml"))).name; + in { + "${name}" = p; + } + ) + localPackages); + in + map ( + p: { + inherit (p) name path; + localSrc = + if localDerivs ? "${p.name}" + then localDerivs.${p.name} + else throw "Local dependency \"${p.name}\" not found in `localPackages`."; + # Keep local packages in a writable location during build. + newPath = p.path; + } + ) (filterPackagesBySource "local" manifestToml.packages); + + # Check if elixir is needed in nativeBuildInputs by checking if "mix" is in + # required build_tools. + isElixirProject = with lib; p: any (t: t == "mix") p.build_tools; + needsElixir = with lib; any isElixirProject manifestToml.packages; + + # nativeBuildInputs needed for both targets. + defaultNativeBuildInputs = [gleam beamPackages.hex rsync git xxhash]; + in + # Base common mkDerivation attributes + stdenv.mkDerivation (attrs + // { + pname = attrs.pname or gleamToml.name; + version = attrs.version or gleamToml.version; + + src = lib.cleanSource attrs.src; + + # Here we must copy the dependencies into the right spot and + # create a packages.toml file so the gleam compiler does not + # attempt to pull the dependencies from the internet. + configurePhase = + attrs.configurePhase + or '' + runHook preConfigure + + mkdir -p build/packages + + # Write the packages.toml file + cat <<EOF > build/packages/packages.toml + ${packagesTOML} + EOF + + ${ + # Gleam writes build output into the local dependency's own source + # directory, so it cannot be the read-only store path. + lib.concatStringsSep "\n" ( + lib.forEach localDeps ( + d: '' + mkdir -p "${d.newPath}" + rsync --chmod=Du=rwx,Dg=rx,Do=rx,Fu=rw,Fg=r,Fo=r -r ${d.localSrc}/* "${d.newPath}/" + '' + ) + ) + } + + ${ + lib.concatStringsSep "\n" ( + lib.forEach gitDerivs ( + d: '' + rsync --chmod=Du=rwx,Dg=rx,Do=rx,Fu=rw,Fg=r,Fo=r -r ${d.derivation}/* build/packages/${d.name}/ + '' + ) + ) + } + + # Copy all the dependencies into place + ${lib.concatStringsSep "\n" ( + lib.forEach depsDerivs ( + # gleam outputs files inside the dependency's source directory + # and therefor it needs to have permissive permissions. + d: '' + rsync --chmod=Du=rwx,Dg=rx,Do=rx,Fu=rw,Fg=r,Fo=r -r ${d.derivation}/* build/packages/${d.name}/ + '' + ) + )} + + # To prevent dependency resolution in Gleam 1.15+, local packages + # need to have their fingerprint up-to-date. + ${lib.concatStringsSep "\n" ( + lib.forEach localDeps (d: '' + printf "%u" 0x$(xxhsum -H3 ${d.newPath}/gleam.toml | cut -d' ' -f1 | cut -d '_' -f2) > build/packages/${d.name}.config_fingerprint + '') + )} + + ${ + # Prime local package dependency caches so they do not try to fetch. + # + # Gleam compiles a local dependency inside that dependency's own + # directory, using the package cache found there. + lib.concatStringsSep "\n" ( + lib.forEach localDeps ( + d: '' + mkdir -p "${d.newPath}/build/packages" + cp build/packages/packages.toml "${d.newPath}/build/packages/packages.toml" + rsync --chmod=Du=rwx,Dg=rx,Do=rx,Fu=rw,Fg=r,Fo=r -r build/packages/* "${d.newPath}/build/packages/" + '' + ) + ) + } + + runHook postConfigure + ''; + } + # When the build target is erlang + // lib.optionalAttrs (buildTarget == "erlang") { + nativeBuildInputs = + defaultNativeBuildInputs + ++ [erlangPackage rebar3Package] + ++ (lib.optional needsElixir beamPackages.elixir) + ++ nativeBuildInputs; + + # The gleam compiler has a nice export function for erlang shipment. + buildPhase = + attrs.buildPhase + or '' + runHook preBuild + + export REBAR_CACHE_DIR="$TMP/.rebar-cache" + + gleam export erlang-shipment + + runHook postBuild + ''; + + # Install all built packages into lib and create an entrypoint script + # that starts the application. + installPhase = + attrs.installPhase + or '' + runHook preInstall + + mkdir -p $out/{bin,lib} + + rsync --exclude=entrypoint.sh -r build/erlang-shipment/* $out/lib/ + + cat <<EOF > $out/bin/${gleamToml.name} + #!/usr/bin/env sh + ${erlangPackage}/bin/erl \ + -pa $out/lib/*/ebin \ + -eval "${gleamToml.name}@@main:run(${gleamToml.name})" \ + -noshell \ + -extra "\$@" + EOF + chmod +x $out/bin/${gleamToml.name} + + runHook postInstall + ''; + } + # When the build target is javascript + // lib.optionalAttrs (buildTarget == "javascript") { + nativeBuildInputs = defaultNativeBuildInputs ++ nativeBuildInputs; + + # The gleam compiler doesn't provide an export mechanism for javascript target. + buildPhase = + attrs.buildPhase + or '' + runHook prebuild + + gleam build --target javascript + + runHook postBuild + ''; + + # Install all built packages into lib and create an entrypoint script + # that starts the application. + installPhase = + attrs.installPhase + or '' + runHook preInstall + + mkdir -p $out/{bin,lib} + + rsync --exclude=gleam.lock --exclude=gleam_version -r build/dev/javascript/* $out/lib/ + + cat <<EOF > $out/lib/${gleamToml.name}/main.mjs + import { main } from "./${gleamToml.name}.mjs"; + main(); + EOF + + cat <<EOF > $out/bin/${gleamToml.name} + #!/usr/bin/env sh + ${nodejs}/bin/node $out/lib/${gleamToml.name}/main.mjs "\$@" + EOF + chmod +x $out/bin/${gleamToml.name} + + runHook postInstall + ''; + }); +} |