dingMCP/test/client-installer.test.ts

import assert from "node:assert/strict";
import { createHash, createPublicKey, generateKeyPairSync, sign } from "node:crypto";
import {
  chmodSync, existsSync, lstatSync, mkdirSync, mkdtempSync, readFileSync, readdirSync, symlinkSync, writeFileSync,
} from "node:fs";
import { tmpdir } from "node:os";
import { basename, delimiter, dirname, join } from "node:path";
import test from "node:test";
import {
  cleanupLegacyInstallations, clientPaths, releaseKeyId, runClientInstaller, verifySignedManifest,
  type ClientReleaseManifest,
} from "../src/client-installer.js";

test("client paths stay in stable per-user locations on all supported platforms", () => {
  assert.equal(clientPaths({}, "linux", "/users/alice").root, "/users/alice/.local/share/dingtalk-approval");
  assert.equal(clientPaths({ XDG_DATA_HOME: "/data/alice" }, "linux", "/users/alice").root, "/data/alice/dingtalk-approval");
  assert.equal(clientPaths({}, "darwin", "/Users/alice").root, "/Users/alice/Library/Application Support/dingtalk-approval");
  assert.equal(clientPaths({ LOCALAPPDATA: "C:\\Users\\alice\\AppData\\Local" }, "win32", "C:\\Users\\alice").root, "C:\\Users\\alice\\AppData\\Local\\DingTalkApproval");
  assert.equal(clientPaths({}, "linux", "/users/alice").bridgeCommand, "/users/alice/.local/share/dingtalk-approval/bin/dingtalk-approval-bridge");
});

test("signed manifest verification rejects tampering and a foreign key", () => {
  const trusted = generateKeyPairSync("ed25519");
  const foreign = generateKeyPairSync("ed25519");
  const publicPem = trusted.publicKey.export({ type: "spki", format: "pem" });
  const keyId = releaseKeyId(publicPem);
  const manifest = manifestFixture(keyId, publicPem);
  const bytes = Buffer.from(`${JSON.stringify(manifest, null, 2)}\n`);
  const signature = signatureEnvelope(keyId, sign(null, bytes, trusted.privateKey));
  assert.equal(verifySignedManifest(bytes, signature, publicPem, "https://approval.example.test/downloads/manifest.json").version, "1.1.0-rc.5");
  assert.throws(() => verifySignedManifest(Buffer.concat([bytes, Buffer.from(" ")]), signature, publicPem, "https://approval.example.test/downloads/manifest.json"), /签名无效/);
  assert.throws(() => verifySignedManifest(bytes, signature, foreign.publicKey.export({ type: "spki", format: "pem" }), "https://approval.example.test/downloads/manifest.json"), /密钥编号不受信任/);

  const stale = { ...manifest, createdAt: new Date(Date.now() - 181 * 24 * 60 * 60_000).toISOString() };
  const staleBytes = Buffer.from(`${JSON.stringify(stale, null, 2)}\n`);
  const staleSignature = signatureEnvelope(keyId, sign(null, staleBytes, trusted.privateKey));
  assert.throws(() => verifySignedManifest(staleBytes, staleSignature, publicPem, "https://approval.example.test/downloads/manifest.json"), /超过 180 天/);
});

test("legacy cleanup removes only owned broken bins and exact old package", () => {
  const root = mkdtempSync(join(tmpdir(), "ding-client-legacy-"));
  const home = join(root, "home");
  const bin = join(home, ".nvm", "versions", "node", "v22.22.2", "bin");
  const packageRoot = join(home, ".nvm", "versions", "node", "v22.22.2", "lib", "node_modules", "dingtalk-approval-mcp");
  mkdirSync(bin, { recursive: true });
  mkdirSync(packageRoot, { recursive: true });
  writeFileSync(join(packageRoot, "package.json"), JSON.stringify({ name: "dingtalk-approval-mcp" }));
  for (const name of ["dingtalk-admin", "dingtalk-approval-bridge", "dingtalk-approval-mcp", "dingtalk-mcp"]) {
    symlinkSync(`../lib/node_modules/dingtalk-approval-mcp/dist/src/${name}.js`, join(bin, name));
  }
  symlinkSync("../lib/node_modules/some-other-package/cli.js", join(bin, "unrelated"));
  const removed = cleanupLegacyInstallations({ PATH: bin }, "linux", home);
  assert.equal(removed.filter((path) => path.includes("dingtalk-")).length, 5);
  for (const name of ["dingtalk-admin", "dingtalk-approval-bridge", "dingtalk-approval-mcp", "dingtalk-mcp"]) assert.equal(existsSync(join(bin, name)), false);
  assert.equal(existsSync(packageRoot), false);
  assert.equal(existsSync(join(bin, "unrelated")), false, "existsSync is false for dangling links");
  assert.equal(lstatSync(join(bin, "unrelated")).isSymbolicLink(), true, "unrelated dangling link remains");
});

test("legacy cleanup removes owned Windows npm shims without touching unrelated commands", () => {
  const root = mkdtempSync(join(tmpdir(), "ding-client-windows-legacy-"));
  const bin = join(root, "npm");
  const packageRoot = join(bin, "node_modules", "dingtalk-approval-mcp");
  mkdirSync(packageRoot, { recursive: true });
  writeFileSync(join(packageRoot, "package.json"), JSON.stringify({ name: "dingtalk-approval-mcp" }));
  writeFileSync(join(bin, "dingtalk-approval-bridge.cmd"), "@node C:\\npm\\node_modules\\dingtalk-approval-mcp\\dist\\src\\bridge.js %*\r\n");
  writeFileSync(join(bin, "dingtalk-mcp.ps1"), "& node C:\\npm\\node_modules\\dingtalk-approval-mcp\\dist\\src\\index.js $args\r\n");
  writeFileSync(join(bin, "dingtalk-admin.cmd"), "@node C:\\npm\\node_modules\\another-package\\admin.js %*\r\n");

  cleanupLegacyInstallations({ PATH: bin, APPDATA: bin }, "win32", join(root, "home"));
  assert.equal(existsSync(join(bin, "dingtalk-approval-bridge.cmd")), false);
  assert.equal(existsSync(join(bin, "dingtalk-mcp.ps1")), false);
  assert.equal(existsSync(packageRoot), false);
  assert.equal(existsSync(join(bin, "dingtalk-admin.cmd")), true);
});

test("generic installer preserves identity across safe updates, rollback, downgrade, and uninstall", async () => {
  const root = mkdtempSync(join(tmpdir(), "ding-client-install-"));
  const appRoot = join(root, "dingtalk-approval");
  const fakeBin = join(root, "fake-bin");
  mkdirSync(fakeBin, { recursive: true });
  createFakeNpm(fakeBin);

  const keys = generateKeyPairSync("ed25519");
  const publicPem = Buffer.from(keys.publicKey.export({ type: "spki", format: "pem" }));
  const keyId = releaseKeyId(publicPem);
  const bodies = {
    installer: Buffer.from("installer"),
    publicKey: publicPem,
    client: Buffer.from("fake-client-tgz"),
    skill: Buffer.from("---\nname: dingtalk-approval\ndescription: Test\n---\n\n# Test\n"),
  };
  const manifest = manifestFixture(keyId, publicPem, bodies);
  const manifestBytes = Buffer.from(`${JSON.stringify(manifest, null, 2)}\n`);
  const signature = signatureEnvelope(keyId, sign(null, manifestBytes, keys.privateKey));
  const responses = new Map<string, Buffer>([
    ["https://approval.example.test/downloads/manifest.json", manifestBytes],
    ["https://approval.example.test/downloads/manifest.sig", signature],
    ...Object.entries(manifest.artifacts).map(([name, artifact]) => [artifact.url, bodies[name as keyof typeof bodies]] as [string, Buffer]),
  ]);
  let downloadCalls = 0;
  const fetchFn = async (input: string | URL | Request) => {
    downloadCalls += 1;
    const url = String(input);
    const body = responses.get(url);
    return body ? new Response(new Uint8Array(body), { status: 200 }) : new Response("missing", { status: 404 });
  };
  const publicPath = join(root, "release-public.pem");
  writeFileSync(publicPath, publicPem, { mode: 0o600 });
  const env: NodeJS.ProcessEnv = { PATH: [fakeBin, process.env.PATH ?? ""].filter(Boolean).join(delimiter), DINGTALK_APPROVAL_CLIENT_HOME: appRoot };
  const output: string[] = [];
  const commandContext = {
    env, platform: process.platform, home: join(root, "home"), fetchFn: fetchFn as typeof fetch,
    stdout: (value: string) => { output.push(value); }, stderr: (value: string) => { output.push(value); },
  };
  const installed = await runClientInstaller([
    "install", "--manifest-url", "https://approval.example.test/downloads/manifest.json",
    "--public-key", publicPath, "--app-root", appRoot, "--json",
  ], commandContext);
  assert.equal(installed, 0);
  const installOutput = JSON.parse(output.pop()!);
  assert.equal(installOutput.restartRequired, undefined);
  assert.match(installOutput.nextSteps.join(" "), /当前 Agent.*skillPath.*stdio MCP/);
  assert.match(installOutput.nextSteps.join(" "), /立即处理 postInstall.*不得等待用户首次查询审批/s);
  assert.equal(installOutput.postInstall.status, "authorization_required");
  assert.equal(installOutput.postInstall.authChallenge.directUrl, "https://approval.example.test/oauth/device?user_code=INSTALL-1234");
  assert.deepEqual(installOutput.loginCommand, {
    command: join(appRoot, "bin", process.platform === "win32" ? "dingtalk-approval.cmd" : "dingtalk-approval"),
    args: ["login", "--json"],
  });
  assert.deepEqual(installOutput.postInstall.loginCommand, installOutput.loginCommand);
  assert.deepEqual(installOutput.postInstall.confirmTool, { name: "approval_login", arguments: {} });
  assert.deepEqual(installOutput.postInstall.verifyTool, {
    name: "approval_list_todos", arguments: { source: "all", query: "", limit: 1 },
  });
  assert.equal(installOutput.mcpConfig.mcpServers["dingtalk-approval"].args.length, 0);
  const paths = clientPaths({ DINGTALK_APPROVAL_CLIENT_HOME: appRoot }, process.platform, join(root, "home"));
  assert.equal(existsSync(paths.bridgeCommand), true);
  assert.equal(existsSync(paths.skillFile), true);
  assert.equal(existsSync(join(paths.skillDir, "references", "create-approval.md")), true);
  const state = JSON.parse(readFileSync(paths.stateFile, "utf8"));
  assert.equal(state.version, "1.1.0-rc.5");
  assert.equal(state.host, undefined);
  assert.doesNotMatch(readFileSync(paths.bridgeCommand, "utf8"), /--url/);
  const stableBridgePath = paths.bridgeCommand;
  const initialRuntime = state.runtimeDir;

  const callsBeforeStandaloneLogin = downloadCalls;
  output.length = 0;
  assert.equal(await runClientInstaller(["login", "--app-root", appRoot, "--json"], commandContext), 0);
  const loginOutput = JSON.parse(output.pop()!);
  assert.equal(loginOutput.operation, "login");
  assert.equal(loginOutput.status, "authorization_required");
  assert.equal(loginOutput.authChallenge.directUrl, "https://approval.example.test/oauth/device?user_code=INSTALL-1234");
  assert.deepEqual(loginOutput.loginCommand, installOutput.loginCommand);
  assert.equal(downloadCalls, callsBeforeStandaloneLogin, "standalone login must not download or reinstall artifacts");

  output.length = 0;
  assert.equal(await runClientInstaller(["login", "--app-root", appRoot, "--json"], {
    ...commandContext, env: { ...env, FAKE_BRIDGE_AUTHENTICATED: "1" },
  }), 0);
  const authenticatedLogin = JSON.parse(output.pop()!);
  assert.equal(authenticatedLogin.status, "authenticated");
  assert.equal(authenticatedLogin.authenticated, true);
  assert.equal(authenticatedLogin.authChallenge, undefined);
  assert.equal(downloadCalls, callsBeforeStandaloneLogin, "authenticated login check must stay local except for the Bridge flow");

  mkdirSync(dirname(paths.sessionFile), { recursive: true });
  const sessionBody = Buffer.from(`${JSON.stringify({
    authenticated: true,
    marker: "preserve-across-updates",
    onboarding: { schemaVersion: 1, status: "delivered", deliveredAt: "2030-01-01T00:00:00.000Z" },
  })}\n`);
  writeFileSync(paths.sessionFile, sessionBody, { mode: 0o600 });

  output.length = 0;
  assert.equal(await runClientInstaller(["print-path", "bridge", "--app-root", appRoot], commandContext), 0);
  assert.equal(output.pop(), `${paths.bridgeCommand}\n`);

  output.length = 0;
  assert.equal(await runClientInstaller(["print-config", "--format", "mcp-json", "--app-root", appRoot, "--json"], commandContext), 0);
  const mcpConfig = JSON.parse(output.pop()!);
  assert.deepEqual(mcpConfig, { mcpServers: { "dingtalk-approval": { type: "stdio", command: paths.bridgeCommand, args: [] } } });

  output.length = 0;
  assert.equal(await runClientInstaller(["doctor", "--app-root", appRoot, "--json"], commandContext), 0);
  const health = JSON.parse(output.pop()!);
  assert.equal(health.ok, true);
  assert.equal(health.checks.find((check: { name: string }) => check.name === "npm").ok, true);

  output.length = 0;
  assert.equal(await runClientInstaller([
    "update", "--app-root", appRoot, "--json",
  ], { ...commandContext, env: { ...env, FAKE_BRIDGE_FAIL: "1" } }), 0, "login preparation failure does not roll back an installed client");
  const sameVersionOutput = JSON.parse(output.pop()!);
  assert.equal(sameVersionOutput.postInstall.status, "unavailable");
  const sameVersionState = JSON.parse(readFileSync(paths.stateFile, "utf8"));
  assert.equal(sameVersionState.host, undefined);
  assert.equal(sameVersionState.runtimeDir, initialRuntime, "same-version update reuses the complete runtime");
  assert.deepEqual(readFileSync(paths.sessionFile), sessionBody, "same-version update preserves the OAuth session");
  assert.deepEqual(readdirSync(paths.versionsDir), [basename(initialRuntime)]);

  output.length = 0;
  assert.equal(await runClientInstaller(["update", "--host", "workbuddy", "--app-root", appRoot, "--json"], commandContext), 1);
  assert.match(JSON.parse(output.pop()!).error, /未知参数：--host/);

  const upgradedBodies = {
    ...bodies,
    client: Buffer.from("fake-client-tgz-v2"),
    skill: Buffer.from("---\nname: dingtalk-approval\ndescription: Test v2\n---\n\n# Test v2\n"),
  };
  const upgraded = manifestFixture(keyId, publicPem, upgradedBodies, "1.1.1");
  const upgradedBytes = Buffer.from(`${JSON.stringify(upgraded, null, 2)}\n`);
  responses.set("https://approval.example.test/downloads/manifest.json", upgradedBytes);
  responses.set("https://approval.example.test/downloads/manifest.sig", signatureEnvelope(keyId, sign(null, upgradedBytes, keys.privateKey)));
  for (const [name, artifact] of Object.entries(upgraded.artifacts)) {
    responses.set(artifact.url, upgradedBodies[name as keyof typeof upgradedBodies]);
  }
  output.length = 0;
  assert.equal(await runClientInstaller([
    "update", "--app-root", appRoot, "--json",
  ], commandContext), 0, "update reuses the pinned manifest URL and public key");
  const upgradedOutput = JSON.parse(output.pop()!);
  const upgradedState = JSON.parse(readFileSync(paths.stateFile, "utf8"));
  assert.equal(upgradedOutput.version, "1.1.1");
  assert.equal(upgradedOutput.restartRequired, undefined);
  assert.equal(upgradedState.host, undefined);
  assert.notEqual(upgradedState.runtimeDir, initialRuntime);
  assert.equal(existsSync(join(appRoot, initialRuntime)), false, "successful upgrade removes the obsolete runtime");
  assert.deepEqual(readdirSync(paths.versionsDir), [basename(upgradedState.runtimeDir)]);
  assert.equal(readFileSync(paths.skillFile, "utf8"), upgradedBodies.skill.toString("utf8"));
  assert.deepEqual(readFileSync(paths.sessionFile), sessionBody, "cross-version update preserves the OAuth session");
  assert.equal(paths.bridgeCommand, stableBridgePath, "the MCP command path remains stable across versions");

  const beforeFailedState = readFileSync(paths.stateFile);
  const beforeFailedSkill = readFileSync(paths.skillFile);
  const beforeFailedVersions = readdirSync(paths.versionsDir);
  const failedBodies = { ...upgradedBodies, client: Buffer.from("fake-client-tgz-v3") };
  const failedUpgrade = manifestFixture(keyId, publicPem, failedBodies, "1.1.2");
  const failedUpgradeBytes = Buffer.from(`${JSON.stringify(failedUpgrade, null, 2)}\n`);
  responses.set("https://approval.example.test/downloads/manifest.json", failedUpgradeBytes);
  responses.set("https://approval.example.test/downloads/manifest.sig", signatureEnvelope(keyId, sign(null, failedUpgradeBytes, keys.privateKey)));
  responses.set(failedUpgrade.artifacts.client.url, Buffer.from("corrupted-client-tgz"));
  output.length = 0;
  assert.equal(await runClientInstaller(["update", "--app-root", appRoot, "--json"], commandContext), 1);
  assert.match(JSON.parse(output.pop()!).error, /SHA-256 不匹配/);
  assert.deepEqual(readFileSync(paths.stateFile), beforeFailedState, "failed update keeps the active install state");
  assert.deepEqual(readFileSync(paths.skillFile), beforeFailedSkill, "failed update keeps the active Skill");
  assert.deepEqual(readdirSync(paths.versionsDir), beforeFailedVersions, "failed update keeps the active runtime");
  assert.deepEqual(readFileSync(paths.sessionFile), sessionBody, "failed update keeps the OAuth session");

  const nextRelease = manifestFixture(keyId, publicPem, failedBodies, "1.1.2");
  const nextBytes = Buffer.from(`${JSON.stringify(nextRelease, null, 2)}\n`);
  responses.set("https://approval.example.test/downloads/manifest.json", nextBytes);
  responses.set("https://approval.example.test/downloads/manifest.sig", signatureEnvelope(keyId, sign(null, nextBytes, keys.privateKey)));
  for (const [name, artifact] of Object.entries(nextRelease.artifacts)) {
    responses.set(artifact.url, failedBodies[name as keyof typeof failedBodies]);
  }
  output.length = 0;
  assert.equal(await runClientInstaller(["update", "--app-root", appRoot, "--json"], commandContext), 0);
  assert.equal(JSON.parse(output.pop()!).version, "1.1.2");
  assert.equal(JSON.parse(readFileSync(paths.stateFile, "utf8")).host, undefined);
  assert.deepEqual(readFileSync(paths.sessionFile), sessionBody);

  const downgraded = manifestFixture(keyId, publicPem, bodies, "1.0.0");
  const downgradedBytes = Buffer.from(`${JSON.stringify(downgraded, null, 2)}\n`);
  responses.set("https://approval.example.test/downloads/manifest.json", downgradedBytes);
  responses.set("https://approval.example.test/downloads/manifest.sig", signatureEnvelope(keyId, sign(null, downgradedBytes, keys.privateKey)));
  output.length = 0;
  assert.equal(await runClientInstaller([
    "update", "--app-root", appRoot, "--json",
  ], commandContext), 1);
  assert.match(JSON.parse(output.pop()!).error, /拒绝.*降级/);
  assert.equal(JSON.parse(readFileSync(paths.stateFile, "utf8")).version, "1.1.2");
  assert.deepEqual(readFileSync(paths.sessionFile), sessionBody);

  for (const [name, artifact] of Object.entries(downgraded.artifacts)) {
    responses.set(artifact.url, bodies[name as keyof typeof bodies]);
  }
  output.length = 0;
  assert.equal(await runClientInstaller([
    "update", "--allow-downgrade", "--app-root", appRoot, "--json",
  ], commandContext), 0, "an explicitly authorized downgrade remains possible");
  const downgradedState = JSON.parse(readFileSync(paths.stateFile, "utf8"));
  assert.equal(downgradedState.version, "1.0.0");
  assert.equal(downgradedState.host, undefined);
  assert.deepEqual(readFileSync(paths.sessionFile), sessionBody);
  assert.equal(readdirSync(paths.versionsDir).length, 1);

  output.length = 0;
  assert.equal(await runClientInstaller(["print-config", "--bogus", "--app-root", appRoot, "--json"], commandContext), 1);
  assert.match(JSON.parse(output.pop()!).error, /未知参数/);

  output.length = 0;
  assert.equal(await runClientInstaller(["uninstall", "--yes", "--app-root", root, "--json"], commandContext), 1);
  assert.match(JSON.parse(output.pop()!).error, /专用.*用户数据目录/);

  output.length = 0;
  const removed = await runClientInstaller(["uninstall", "--yes", "--app-root", appRoot, "--json"], {
    ...commandContext,
  });
  assert.equal(removed, 0);
  assert.equal(existsSync(appRoot), false);
  output.length = 0;
  assert.equal(await runClientInstaller(["login", "--app-root", appRoot, "--json"], commandContext), 1);
  assert.match(JSON.parse(output.pop()!).error, /尚未安装/);
});

function manifestFixture(
  keyId: string,
  publicKey: string | Buffer,
  bodies = {
    installer: Buffer.from("installer"), publicKey: Buffer.from(publicKey), client: Buffer.from("client"),
    skill: Buffer.from("skill"),
  },
  version = "1.1.0-rc.5",
): ClientReleaseManifest {
  const base = "https://approval.example.test/downloads/";
  const artifact = (name: keyof typeof bodies) => ({ url: `${base}${name}`, sha256: digest(bodies[name]) });
  return {
    schemaVersion: 3,
    version,
    createdAt: new Date().toISOString(),
    gatewayUrl: "https://approval.example.test/mcp",
    signing: { algorithm: "Ed25519", keyId },
    requirements: { node: ">=22.13.0" },
    artifacts: {
      installer: artifact("installer"),
      publicKey: { ...artifact("publicKey"), keyId },
      client: artifact("client"),
      skill: artifact("skill"),
    },
  };
}

function signatureEnvelope(keyId: string, value: Buffer): Buffer {
  return Buffer.from(JSON.stringify({ schemaVersion: 1, algorithm: "Ed25519", keyId, signature: value.toString("base64") }));
}

function digest(value: Buffer): string { return createHash("sha256").update(value).digest("hex"); }

function createFakeNpm(bin: string): void {
  const fakeBridge = `#!/usr/bin/env node
if (process.env.FAKE_BRIDGE_FAIL === "1") process.exit(2);
if (process.argv.includes("--login") || process.argv.includes("--post-install-login")) {
  if (process.env.FAKE_BRIDGE_AUTHENTICATED === "1") {
    console.log(JSON.stringify({ authenticated: true, message: "已登录，可以读取审批。" }));
    process.exit(0);
  }
  console.log(JSON.stringify({
    authenticated: false,
    message: "需要完成钉钉授权登录。",
    authChallenge: {
      provider: "dingtalk",
      type: "link",
      directUrl: "https://approval.example.test/oauth/device?user_code=INSTALL-1234",
      userCode: "INSTALL-1234",
      expiresAt: "2030-01-01T00:00:00.000Z",
      pollAfterSeconds: 5
    }
  }));
}
`;
  const implementation = process.platform === "win32"
    ? join(bin, "node_modules", "npm", "bin", "npm-cli.js")
    : join(bin, "fake-npm.mjs");
  mkdirSync(join(implementation, ".."), { recursive: true });
  writeFileSync(implementation, `#!/usr/bin/env node
import { mkdirSync, writeFileSync } from "node:fs";
import { join } from "node:path";
if (process.argv[2] === "--version") { console.log("11.0.0"); process.exit(0); }
const index = process.argv.indexOf("--prefix");
if (index < 0 || !process.argv[index + 1]) { console.error("missing prefix"); process.exit(2); }
const prefix = process.argv[index + 1];
const target = join(prefix, "node_modules", "dingtalk-approval-client", "dist", "src");
mkdirSync(target, { recursive: true });
writeFileSync(join(target, "bridge.js"), ${JSON.stringify(fakeBridge)});
writeFileSync(join(target, "client-installer.js"), "#!/usr/bin/env node\\n");
const skill = join(prefix, "node_modules", "dingtalk-approval-client", "skill", "dingtalk-approval");
mkdirSync(join(skill, "references"), { recursive: true });
writeFileSync(join(skill, "SKILL.md"), "---\\nname: dingtalk-approval\\ndescription: Bundled test\\n---\\n");
writeFileSync(join(skill, "references", "create-approval.md"), "# Create approval\\n");
`);
  if (process.platform === "win32") {
    writeFileSync(join(bin, "npm.cmd"), "@echo off\r\nexit /b 99\r\n");
  } else {
    const executable = join(bin, "npm");
    writeFileSync(executable, `#!/usr/bin/env sh\nexec "${process.execPath}" "$(dirname "$0")/fake-npm.mjs" "$@"\n`, { mode: 0o700 });
    chmodSync(executable, 0o700);
  }
}