From cb475fd8c0bbfcb00340459966b6780f39ea87a7 Mon Sep 17 00:00:00 2001
From: Cuki <2996147+cuki@users.noreply.github.com>
Date: Wed, 17 Jul 2019 06:59:45 +0200
Subject: [PATCH] Fix: Cache file error handling on read-only file system.
 (fixes #11945) (#11946)

---
 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 d7512fe3f36..7f80887f086 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;
                 }
             }