From 24abc5e1542dce86f5f588b81723f262ed757ad6 Mon Sep 17 00:00:00 2001
From: Ville Immonen <ville.immonen@iki.fi>
Date: Mon, 9 Jan 2017 17:25:31 +0200
Subject: [PATCH] Use yarnpkg alias to run Yarn (#1365)
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There’s a common tool included in Hadoop that also has a `yarn` command,
which created issues for users who had Hadoop installed:
* #1257
* #1363

Yarn also installs the command under `yarnpkg` alias (added in
https://github.com/yarnpkg/yarn/commit/cefa9a368dd3df1a1f1ecd9e50de9c5fabefbc92)
so we can use `yarnpkg` instead of `yarn` to make it more reliable.

This has no effect on users who don't have Hadoop installed, but those
who have won't see errors from falsely detecting Hadoop Yarn as Yarn
the package manager, and they can now also install Yarn to make use of
our Yarn support without the Hadoop Yarn interfering.
---
 packages/create-react-app/index.js      | 4 ++--
 packages/react-scripts/scripts/eject.js | 2 +-
 packages/react-scripts/scripts/init.js  | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/packages/create-react-app/index.js b/packages/create-react-app/index.js
index 7c9394ea371..399bfdd2137 100644
--- a/packages/create-react-app/index.js
+++ b/packages/create-react-app/index.js
@@ -138,7 +138,7 @@ function createApp(name, verbose, version) {
 
 function shouldUseYarn() {
   try {
-    execSync('yarn --version', {stdio: 'ignore'});
+    execSync('yarnpkg --version', {stdio: 'ignore'});
     return true;
   } catch (e) {
     return false;
@@ -149,7 +149,7 @@ function install(packageToInstall, verbose, callback) {
   var command;
   var args;
   if (shouldUseYarn()) {
-    command = 'yarn';
+    command = 'yarnpkg';
     args = [ 'add', '--dev', '--exact', packageToInstall];
   } else {
     command = 'npm';
diff --git a/packages/react-scripts/scripts/eject.js b/packages/react-scripts/scripts/eject.js
index 2ae89a4530e..d97f814ecac 100644
--- a/packages/react-scripts/scripts/eject.js
+++ b/packages/react-scripts/scripts/eject.js
@@ -147,7 +147,7 @@ prompt(
   if (pathExists.sync(paths.yarnLockFile)) {
     console.log(cyan('Running yarn...'));
     fs.removeSync(ownPath);
-    spawnSync('yarn', [], {stdio: 'inherit'});
+    spawnSync('yarnpkg', [], {stdio: 'inherit'});
   } else {
     console.log(cyan('Running npm install...'));
     fs.removeSync(ownPath);
diff --git a/packages/react-scripts/scripts/init.js b/packages/react-scripts/scripts/init.js
index c9a4ea14ac4..4d0d91e9f81 100644
--- a/packages/react-scripts/scripts/init.js
+++ b/packages/react-scripts/scripts/init.js
@@ -65,7 +65,7 @@ module.exports = function(appPath, appName, verbose, originalDirectory) {
   var args;
 
   if (useYarn) {
-    command = 'yarn';
+    command = 'yarnpkg';
     args = ['add'];
   } else {
     command = 'npm';