Add spell checking to linter step

Note that this is currently only enabled on Linux, because:
- check-spelling does not support Windows
- on macOS, check-spelling fails to ignore long words listed in expect.txt
  (check-spelling/check-spelling#84)

Signed-off-by: Mark Yen <mark.yen@suse.com>

package.json

@@ -18,12 +18,13 @@
   "scripts": {
     "dev": "node scripts/ts-wrapper.js scripts/dev.ts",
     "lint": "yarn lint:fix",
-    "lint:fix": "yarn lint:typescript:fix && yarn lint:go:fix ",
-    "lint:nofix": "yarn lint:typescript:nofix && yarn lint:go:nofix",
+    "lint:fix": "yarn lint:typescript:fix && yarn lint:go:fix && yarn lint:spelling",
+    "lint:nofix": "yarn lint:typescript:nofix && yarn lint:go:nofix && yarn lint:spelling",
     "lint:typescript:fix": "cross-env BROWSERSLIST_IGNORE_OLD_DATA=1 NODE_OPTIONS=--max_old_space_size=4096 eslint --ignore-path=.gitignore --ext mjs,js,ts,tsx,vue --fix --report-unused-disable-directives .",
     "lint:typescript:nofix": "cross-env BROWSERSLIST_IGNORE_OLD_DATA=1 NODE_OPTIONS=--max_old_space_size=4096 eslint --ignore-path=.gitignore --ext mjs,js,ts,tsx,vue --report-unused-disable-directives --max-warnings=0 .",
     "lint:go:fix": "node scripts/ts-wrapper.js scripts/lint-go.ts --fix",
     "lint:go:nofix": "node scripts/ts-wrapper.js scripts/lint-go.ts",
+    "lint:spelling": "node scripts/ts-wrapper.js scripts/spelling.ts",
     "generate:nerdctl-stub": "powershell scripts/windows/generate-nerdctl-stub.ps1",
     "build": "cross-env NODE_OPTIONS=--max_old_space_size=4096 node --stack-size=16384 scripts/ts-wrapper.js scripts/build.ts",
     "package": "node scripts/ts-wrapper.js scripts/package.ts",

scripts/spelling.ts

@@ -0,0 +1,88 @@
+/**
+ * This script runs github.com/check-spelling/check-spelling locally.  It
+ * requires a working sh interpreter, perl, and possibly other things.
+ * This is meant to be used as a local check before pushing to make PRs; this is
+ * a no-op in CI as we still rely on the CI workflow there instead.
+ */
+
+import fs from 'fs/promises';
+import path from 'path';
+
+import yaml from 'yaml';
+
+import { simpleSpawn } from './simple_process';
+
+if (process.env.CI) {
+  console.log(`Skipping spell checking in CI, please see separate workflow.`);
+  process.exit();
+}
+
+if (process.platform === 'win32') {
+  console.log(`Skipping spell checking, Windows is not supported.`);
+  process.exit();
+}
+
+if (process.platform === 'darwin') {
+  // On macOS, the spell checker fails to skip expected long words.
+  // Disable spell checking there for now.
+  // https://github.com/check-spelling/check-spelling/issues/84
+  console.log(`Skipping spell checking, macOS has false positives.`);
+  process.exit();
+}
+
+/**
+ * Clone the check-spelling repository if needed, and return the script.
+ * @param step GitHub Actions check spelling step configuration.
+ * @returns Path to unknown-words.sh
+ */
+async function findScript(step: any): Promise<string> {
+  // Put the check-spelling files in `$PWD/resources/host/check-spelling
+  const checkout = path.join(process.cwd(), 'resources', 'host', 'check-spelling');
+  const script = path.join(checkout, 'unknown-words.sh');
+  const [repo, hash] = step.uses?.split('@') ?? [];
+
+  if (!repo) {
+    throw new Error('Failed to find check-spelling repository from GitHub Actions workflow');
+  }
+  if (!hash) {
+    throw new Error('Failed to find commit/branch to use for check-spelling');
+  }
+
+  try {
+    await fs.stat(script);
+    // Update the checkout.
+    await simpleSpawn('git', ['-C', checkout, 'fetch']);
+  } catch (ex) {
+    // Assume file not found.
+    await simpleSpawn('git', ['clone', '--no-checkout', `https://github.com/${ repo }.git`, checkout]);
+  }
+  await simpleSpawn('git', ['-C', checkout, 'checkout', hash]);
+
+  return script;
+}
+
+(async function() {
+  // Locate the GitHub Actions workflow and locate the check spelling step.
+  const configPath = path.join(process.cwd(), '.github', 'workflows', 'spelling.yml');
+  const config = yaml.parse(await fs.readFile(configPath, { encoding: 'utf-8' }));
+  const step = config.jobs?.spelling?.steps?.find((step: any) => step?.id === 'spelling');
+  const stepConfig = step?.with;
+
+  if (!stepConfig) {
+    throw new Error('Failed to locate check-spelling CI configuration');
+  }
+  // Remove configuration that does not make sense outside of CI.
+  delete stepConfig.experimental_apply_changes_via_bot;
+  delete stepConfig.use_sarif;
+
+  // Set up configuration for the script.
+  process.env.INPUTS = JSON.stringify(stepConfig);
+
+  // Find the check spelling script and run it.
+  const script = await findScript(step);
+
+  await simpleSpawn(script);
+})().catch((err) => {
+  console.error(err);
+  process.exit(1);
+});