From 0e59c5a742513839af2cfbd5e305afe18b3d800f Mon Sep 17 00:00:00 2001
From: Cuki <2996147+cuki@users.noreply.github.com>
Date: Thu, 4 Jul 2019 12:26:28 +0200
Subject: [PATCH] Fix: Cache file error handling on read-only file system.
 (fixes #11945)

---
 lib/cli-engine/cli-engine.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/cli-engine/cli-engine.js b/lib/cli-engine/cli-engine.js
index 81e1b07c83e..671a389ad4b 100644
--- a/lib/cli-engine/cli-engine.js
+++ b/lib/cli-engine/cli-engine.js
@@ -734,7 +734,10 @@ class CLIEngine {
             try {
                 fs.unlinkSync(cacheFilePath);
             } catch (error) {
-                if (!error || error.code !== "ENOENT") {
+                const errorCode = error && error.code;
+
+                // Ignore errors when no such file exists or file system is read only (and cache file does not exist)
+                if (errorCode !== "ENOENT" && !(errorCode === "EROFS" && !fs.existsSync(cacheFilePath))) {
                     throw error;
                 }
             }