Draft initial implementation

lib/main.js

@@ -16,11 +16,15 @@ var __importStar = (this && this.__importStar) || function (mod) {
 };
 Object.defineProperty(exports, "__esModule", { value: true });
 const core = __importStar(require("@actions/core"));
+const rustup = __importStar(require("./rustup"));
+const os = __importStar(require("os"));
 function run() {
     return __awaiter(this, void 0, void 0, function* () {
         try {
-            const myInput = core.getInput('myInput');
-            core.debug(`Hello ${myInput}`);
+            const version = core.getInput('rust-version');
+            if (version && os.platform() != 'win32') {
+                yield rustup.install(version);
+            }
         }
         catch (error) {
             core.setFailed(error.message);

lib/rustup.js

@@ -0,0 +1,88 @@
+"use strict";
+var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
+    return new (P || (P = Promise))(function (resolve, reject) {
+        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
+        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
+        function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
+    });
+};
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (Object.hasOwnProperty.call(mod, k)) result[k] = mod[k];
+    result["default"] = mod;
+    return result;
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+const core = __importStar(require("@actions/core"));
+const exec = __importStar(require("@actions/exec"));
+const io = __importStar(require("@actions/io"));
+const toolCache = __importStar(require("@actions/tool-cache"));
+const path = __importStar(require("path"));
+const os = __importStar(require("os"));
+const fs_1 = require("fs");
+let osPlat = os.platform();
+let osArch = os.arch();
+let tempDirectory = process.env['RUNNER_TEMPDIRECTORY'] || '';
+const WINDOWS = osPlat == 'win32';
+function install(version) {
+    return __awaiter(this, void 0, void 0, function* () {
+        let toolPath = toolCache.find('rust', version);
+        if (!toolPath) {
+            toolPath = yield acquireRust(version);
+            core.debug('Rust toolchain is cached under ' + toolPath);
+        }
+        toolPath = path.join(toolPath, 'bin');
+        core.addPath(toolPath);
+        yield exec.exec('rustup', ['update']);
+    });
+}
+exports.install = install;
+function acquireRust(version) {
+    return __awaiter(this, void 0, void 0, function* () {
+        let script;
+        try {
+            script = yield toolCache.downloadTool(rustupUrl());
+        }
+        catch (error) {
+            core.debug(error);
+            throw `Failed to download rustup: ${error}`;
+        }
+        if (WINDOWS) {
+            // TODO: Fix this
+            // It currently fails with:
+            // error: 'rustup-init.exe' is not installed for the toolchain 'stable-x86_64-pc-windows-msvc'
+            yield io.cp(script, script + '.exe');
+            script += '.exe';
+            const powershell = yield io.which('powershell', true);
+            yield exec.exec(`"${script}"`, [
+                '--default-host',
+                'gnu',
+                '--default-toolchain',
+                version,
+            ]);
+        }
+        else {
+            fs_1.chmodSync(script, '777');
+            yield exec.exec(`"${script}"`, ['-y', '--default-toolchain', version]);
+        }
+        return yield toolCache.cacheDir(binRoot(), 'rust', version);
+    });
+}
+function rustupUrl() {
+    if (WINDOWS) {
+        return "https://static.rust-lang.org/rustup/dist/x86_64-pc-windows-gnu/rustup-init.exe";
+    }
+    else {
+        return "https://sh.rustup.rs";
+    }
+}
+function binRoot() {
+    if (WINDOWS) {
+        return path.join(process.env['USERPROFILE'] || '', '.cargo');
+    }
+    else {
+        return path.join(process.env['HOME'] || '', '.cargo');
+    }
+}