From c139829b1013c0c1b1d0a20d471d77769b3c91f1 Mon Sep 17 00:00:00 2001
From: Matthew Phillips <matthew@skypack.dev>
Date: Wed, 9 Mar 2022 16:44:12 -0500
Subject: [PATCH] Fixes windows test flakiness (#2744)

* Fixes windows test flakiness

* Tighten up the try/catch
---
 packages/astro/src/core/build/fs.ts | 46 ++++++++++++++++++++++++++++-
 1 file changed, 45 insertions(+), 1 deletion(-)

diff --git a/packages/astro/src/core/build/fs.ts b/packages/astro/src/core/build/fs.ts
index badfc815d5..510f84c778 100644
--- a/packages/astro/src/core/build/fs.ts
+++ b/packages/astro/src/core/build/fs.ts
@@ -4,6 +4,8 @@ import fs from 'fs';
 import npath from 'path';
 import { fileURLToPath } from 'url';
 
+const isWindows = process.platform === 'win32';
+
 export function emptyDir(dir: string, skip?: Set<string>): void {
 	for (const file of fs.readdirSync(dir)) {
 		if (skip?.has(file)) {
@@ -11,7 +13,20 @@ export function emptyDir(dir: string, skip?: Set<string>): void {
 		}
 		const abs = npath.resolve(dir, file);
 		// baseline is Node 12 so can't use rmSync :(
-		if (fs.lstatSync(abs).isDirectory()) {
+		let isDir = false;
+		try {
+			isDir = fs.lstatSync(abs).isDirectory();
+		} catch (err: any) {
+			// Taken from:
+			// https://github.com/isaacs/rimraf/blob/9219c937be159edbdf1efa961f2904e863c3ce2d/rimraf.js#L293-L296
+			if (err.code === 'EPERM' && isWindows) {
+				fixWinEPERMSync(abs, err);
+			} else {
+				throw err;
+			}
+		}
+
+		if (isDir) {
 			emptyDir(abs);
 			fs.rmdirSync(abs);
 		} else {
@@ -26,3 +41,32 @@ export function prepareOutDir(astroConfig: AstroConfig) {
 		return emptyDir(outDir, new Set(['.git']));
 	}
 }
+
+function fixWinEPERMSync(path: string, error: Error) {
+	try {
+		fs.chmodSync(path, 0o666);
+	} catch (er2: any) {
+		if (er2.code === 'ENOENT') {
+			return;
+		} else {
+			throw error;
+		}
+	}
+
+	let stats;
+	try {
+		stats = fs.statSync(path);
+	} catch (er3: any) {
+		if (er3.code === 'ENOENT') {
+			return;
+		} else {
+			throw error;
+		}
+	}
+
+	if (stats.isDirectory()) {
+		emptyDir(path);
+	} else {
+		fs.unlinkSync(path);
+	}
+}