From 037b96ad3f03f409734a7b14d94d365e065d22a6 Mon Sep 17 00:00:00 2001
From: Jean Lauliac <jeanlauliac@fb.com>
Date: Thu, 27 Apr 2017 11:12:01 +0100
Subject: [PATCH] jest-config: use UID for default cache folder

---
 packages/jest-config/src/defaults.js | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/packages/jest-config/src/defaults.js b/packages/jest-config/src/defaults.js
index 2b38275c529c..da81bf647cd9 100644
--- a/packages/jest-config/src/defaults.js
+++ b/packages/jest-config/src/defaults.js
@@ -23,7 +23,14 @@ module.exports = ({
   automock: false,
   bail: false,
   browser: false,
-  cacheDirectory: path.join(os.tmpdir(), 'jest'),
+  cacheDirectory: (() => {
+    if (process.getuid == null) {
+      return path.join(os.tmpdir(), 'jest');
+    }
+    // On some platforms tmpdir() is `/tmp`, causing conflicts between different users and
+    // permission issues. Adding an additional subdivision by UID can help.
+    return path.join(os.tmpdir(), 'jest', process.getuid().toString(36));
+  })(),
   clearMocks: false,
   coveragePathIgnorePatterns: [NODE_MODULES_REGEXP],
   coverageReporters: ['json', 'text', 'lcov', 'clover'],