added install script for agent

changed backend to agent

agent/src/routes/health.js

@@ -0,0 +1,88 @@
+import { Router } from 'express';
+import { access } from 'node:fs/promises';
+import { constants } from 'node:fs';
+import { config, missingEnvVars } from '../config.js';
+import { spawnCommand, runRestic } from '../executor.js';
+
+export const healthRouter = Router();
+
+healthRouter.get('/', async (_req, res) => {
+  const missing = missingEnvVars();
+  const checks = {
+    config: checkValue(!missing.length, missing.length ? `missing: ${missing.join(', ')}` : 'ok'),
+    commands: await checkCommands({
+      incus: ['version'],
+      zfs: ['version'],
+      zpool: ['version'],
+      restic: ['version'],
+      udevadm: ['--version'],
+      dd: ['--version'],
+    }),
+    zfsPool: await checkZfsPool(),
+    zvol: await checkZvolAccess(),
+    resticRepository: await checkResticRepository(),
+  };
+
+  const ok = Object.values(checks).every((value) => value.ok);
+  res.status(ok ? 200 : 503).json({ ok, checks });
+});
+
+async function checkCommands(commands) {
+  const results = {};
+  await Promise.all(Object.entries(commands).map(async ([command, args]) => {
+    results[command] = await checkCommand(command, args);
+  }));
+  const failed = Object.entries(results).filter(([, result]) => !result.ok);
+  return {
+    ok: failed.length === 0,
+    message: failed.length ? `failed: ${failed.map(([command]) => command).join(', ')}` : 'ok',
+    details: results,
+  };
+}
+
+async function checkCommand(command, args) {
+  try {
+    const result = await spawnCommand(command, args, { ignoreExitCode: true });
+    return checkValue(result.exitCode === 0, result.exitCode === 0 ? 'ok' : result.stderr.trim() || result.stdout.trim() || 'failed');
+  } catch (error) {
+    return checkValue(false, error.message);
+  }
+}
+
+async function checkZfsPool() {
+  if (!config.zfsPoolName) return checkValue(false, 'ZFS_POOL_NAME is not configured');
+  try {
+    const result = await spawnCommand('zpool', ['list', '-Hp', '-o', 'name,size,alloc,free,cap', config.zfsPoolName], { ignoreExitCode: true });
+    if (result.exitCode !== 0) return checkValue(false, result.stderr.trim() || 'zpool list failed');
+    const [name, size, allocated, free, capacity] = result.stdout.trim().split('\t');
+    return {
+      ok: true,
+      message: 'ok',
+      details: { name, size: Number(size), allocated: Number(allocated), free: Number(free), capacity },
+    };
+  } catch (error) {
+    return checkValue(false, error.message);
+  }
+}
+
+async function checkZvolAccess() {
+  try {
+    await access('/dev/zvol', constants.R_OK);
+    return checkValue(true, 'ok');
+  } catch (error) {
+    return checkValue(false, error.message);
+  }
+}
+
+async function checkResticRepository() {
+  try {
+    const result = await runRestic(['--no-lock', 'snapshots', '--json'], { ignoreExitCode: true });
+    return checkValue(result.exitCode === 0, result.exitCode === 0 ? 'ok' : result.stderr.trim() || 'restic repository check failed');
+  } catch (error) {
+    return checkValue(false, error.message);
+  }
+}
+
+function checkValue(ok, message, details = null) {
+  return { ok, message, ...(details ? { details } : {}) };
+}