CI: run in tmpfs

Build/constants/dir.ts

@@ -1,4 +1,7 @@
 import path from 'node:path';
+import os from 'node:os';
+import fs from 'node:fs';
+import { isCI } from 'ci-info';
 
 export const ROOT_DIR = path.resolve(__dirname, '../..');
 
@@ -6,7 +9,10 @@ export const CACHE_DIR = path.resolve(ROOT_DIR, '.cache');
 
 export const SOURCE_DIR = path.join(ROOT_DIR, 'Source');
 
-export const PUBLIC_DIR = path.resolve(ROOT_DIR, 'public');
+export const PUBLIC_DIR = isCI
+  ? fs.mkdtempSync(path.join(os.tmpdir(), 'sukkaw-surge-public-'))
+  : path.resolve(ROOT_DIR, 'public');
+
 export const OUTPUT_SURGE_DIR = path.join(PUBLIC_DIR, 'List');
 export const OUTPUT_CLASH_DIR = path.resolve(PUBLIC_DIR, 'Clash');
 export const OUTPUT_SINGBOX_DIR = path.resolve(PUBLIC_DIR, 'sing-box');

Build/download-previous-build.ts

@@ -9,12 +9,13 @@ import undici from 'undici';
 import picocolors from 'picocolors';
 import { PUBLIC_DIR } from './constants/dir';
 import { requestWithLog } from './lib/fetch-retry';
+import { isDirectoryEmptySync } from './lib/misc';
 
 const GITHUB_CODELOAD_URL = 'https://codeload.github.com/sukkalab/ruleset.skk.moe/tar.gz/master';
 const GITLAB_CODELOAD_URL = 'https://gitlab.com/SukkaW/ruleset.skk.moe/-/archive/master/ruleset.skk.moe-master.tar.gz';
 
 export const downloadPreviousBuild = task(require.main === module, __filename)(async (span) => {
-  if (fs.existsSync(PUBLIC_DIR)) {
+  if (fs.existsSync(PUBLIC_DIR) && !isDirectoryEmptySync(PUBLIC_DIR)) {
     console.log(picocolors.blue('Public directory exists, skip downloading previous build'));
     return;
   }

Build/index.ts

@@ -29,7 +29,9 @@ import { buildCloudMounterRules } from './build-cloudmounter-rules';
 import { createSpan, printTraceResult, whyIsNodeRunning } from './trace';
 import { buildDeprecateFiles } from './build-deprecate-files';
 import path from 'node:path';
-import { ROOT_DIR } from './constants/dir';
+import { PUBLIC_DIR, ROOT_DIR } from './constants/dir';
+
+import { setOutput } from '@actions/core';
 
 process.on('uncaughtException', (error) => {
   console.error('Uncaught exception:', error);
@@ -106,6 +108,10 @@ const buildFinishedLock = path.join(ROOT_DIR, '.BUILD_FINISHED');
     // write a file to demonstrate that the build is finished
     fs.writeFileSync(buildFinishedLock, 'BUILD_FINISHED\n');
 
+    if (process.env.GITHUB_OUTPUT) {
+      setOutput('public_dir', PUBLIC_DIR);
+    }
+
     // Finish the build to avoid leaking timer/fetch ref
     await whyIsNodeRunning();
     process.exit(0);

Build/lib/misc.ts

@@ -1,5 +1,6 @@
 import { dirname } from 'node:path';
 import fs from 'node:fs';
+import type { PathLike } from 'node:fs';
 import fsp from 'node:fs/promises';
 
 export function fastStringCompare(a: string, b: string) {
@@ -79,3 +80,13 @@ export function withBannerArray(title: string, description: string[] | readonly
     '################## EOF ##################'
   ];
 };
+
+export function isDirectoryEmptySync(path: PathLike) {
+  const directoryHandle = fs.opendirSync(path);
+
+  try {
+    return directoryHandle.readSync() === null;
+  } finally {
+    directoryHandle.closeSync();
+  }
+}