Background

1// The detached jobs setup.mjs and attach.mjs start (through proc.mjs startBackground), run by node
2// so they need no shell on any OS. Each leaves the files the caller syncs on:
3//
4//   node background.mjs install                install.mjs: nothing when node_modules already satisfies
5//                                              the lock, npm install when a tree is there, else npm ci
6//                                              (falling back to npm install); --ignore-scripts, output
7//                                              inherited (the install log); the exit code to .install-exit
8//   node background.mjs seed <seed.mjs> <plan>  the seed's stdout to seed-result.json, its stderr to
9//                                              seed.log, then its exit code to .seed-exit
10import { spawnSync } from "node:child_process";
11import { closeSync, openSync, writeFileSync } from "node:fs";
12import { runInstall } from "./install.mjs";
13
14const [job, ...args] = process.argv.slice(2);
15
16if (job === "install") {
17  const r = runInstall(process.cwd());
18  console.log(`install: ${r.decision}${r.lock ? ` (${r.lock.missing} of ${r.lock.total} lock entries were missing)` : ""}`);
19  process.exit(r.status);
20} else if (job === "seed") {
21  const [seedFile, plan] = args;
22  const out = openSync("seed-result.json", "w");
23  const err = openSync("seed.log", "w");
24  const r = spawnSync(process.execPath, [seedFile, plan], { stdio: ["ignore", out, err], windowsHide: true });
25  closeSync(out);
26  closeSync(err);
27  if (r.error) writeFileSync("seed.log", `the seed could not start: ${r.error.message}\n`, { flag: "a" });
28  writeFileSync(".seed-exit", `${r.status ?? 1}\n`);
29} else {
30  console.error("usage: background.mjs install <ci|install> | seed <seed.mjs> <plan.json>");
31  process.exit(2);
32}