feat(rust/cargo): use user directory for cargo builds

Author: deciduously

packages/gn.tg.ts

@@ -0,0 +1,81 @@
+import * as std from "std" with { local: "./std" };
+import { $ } from "std" with { local: "./std" };
+import ninja from "ninja" with { local: "./ninja.tg.ts" };
+import python from "python" with { local: "./python" };
+
+export const metadata = {
+	homepage: "https://gn.googlesource.com/gn",
+	license: "BSD-3-Clause",
+	name: "gn",
+	repository: "https://gn.googlesource.com/gn",
+	version: "0.2216",
+	tag: "gn/0.2216",
+	provides: {
+		binaries: ["gn"],
+	},
+};
+
+// Pinned commit compatible with V8 146.
+const commit = "20a26907f754fed7927e5c5fd103a23a3a528cdf";
+
+export const source = async () => {
+	const checksum = "sha256:any";
+	const url = `https://gn.googlesource.com/gn/+archive/${commit}.tar.gz`;
+	// googlesource archives are flat (no top-level directory).
+	return await std
+		.download({ checksum, url, mode: "extract" })
+		.then(tg.Directory.expect);
+};
+
+export type Arg = {
+	build?: string;
+	env?: std.env.Arg;
+	host?: string;
+	sdk?: std.sdk.Arg;
+};
+
+export const build = async (...args: std.Args<Arg>) => {
+	const {
+		build: build_,
+		env: env_,
+		host: host_,
+		sdk,
+	} = await std.args.apply<Arg, Arg>({
+		args,
+		map: async (arg) => arg,
+		reduce: {
+			env: (a, b) => std.env.arg(a, b),
+			sdk: (a, b) => std.sdk.arg(a, b),
+		},
+	});
+	const host = host_ ?? std.triple.host();
+	const build = build_ ?? host;
+	const sourceDir = await source();
+
+	const env = std.env.arg(
+		std.sdk({ host: build, target: host, toolchain: "llvm", ...sdk }),
+		ninja({ build, host: build }),
+		python({ build, host: build }),
+		env_,
+	);
+
+	return await $`
+		cp -R ${sourceDir}/. work
+		chmod -R u+w work
+		cd work
+		python3 build/gen.py --no-last-commit-position
+		ninja -C out gn
+		mkdir -p $OUTPUT/bin
+		cp out/gn $OUTPUT/bin/gn
+	`
+		.checksum("sha256:any")
+		.env(env)
+		.then(tg.Directory.expect);
+};
+
+export default build;
+
+export const test = async () => {
+	const spec = std.assert.defaultSpec(metadata);
+	return await std.assert.pkg(build, spec);
+};