react-native run-ios --device not working with XCode 12.5 CLI tools

Environment

System:
    OS: macOS 11.3
    CPU: (8) x64 Intel(R) Core(TM) i5-8259U CPU @ 2.30GHz
    Memory: 626.05 MB / 16.00 GB
    Shell: 5.8 - /bin/zsh
  Binaries:
    Node: 14.2.0 - /var/folders/34/_v0h6lqn0x17yx6pppvqrnbmcjbc20/T/yarn--1619714124765-0.3284344217580091/node
    Yarn: 1.22.10 - /var/folders/34/_v0h6lqn0x17yx6pppvqrnbmcjbc20/T/yarn--1619714124765-0.3284344217580091/yarn
    npm: 6.14.4 - ~/.nvm/versions/node/v14.2.0/bin/npm
    Watchman: 4.9.0 - /usr/local/bin/watchman
  Managers:
    CocoaPods: 1.10.1 - /usr/local/bin/pod
  SDKs:
    iOS SDK:
      Platforms: iOS 14.5, DriverKit 20.4, macOS 11.3, tvOS 14.5, watchOS 7.4
    Android SDK:
      API Levels: 23, 28, 29
      Build Tools: 28.0.3, 29.0.2, 29.0.3
      System Images: android-28 | Intel x86 Atom_64, android-29 | Google APIs Intel x86 Atom, android-30 | Google Play Intel x86 Atom
      Android NDK: Not Found
  IDEs:
    Android Studio: 4.1 AI-201.8743.12.41.7042882
    Xcode: 12.5/12E262 - /usr/bin/xcodebuild
  Languages:
    Java: 1.8.0_252 - /usr/bin/javac
  npmPackages:
    @react-native-community/cli: Not Found
    react: 17.0.1 => 17.0.1 
    react-native: 0.64.0 => 0.64.0 
    react-native-macos: Not Found
  npmGlobalPackages:
    *react-native*: Not Found

Description

After upgrading to the latest version of Xcode (12.5), I can no longer run my react-native project on a physical device. Running react-native run-ios --device=X always results in an error and a message that there are no available devices to run on:

I’ve tracked the issue down to this line. It seems that xcrun xctrace list devices no longer outputs to stderr:

tail error => empty, tail out => list of devices. Changing the above line to stdout instead of stderr fixes the issue locally for me.

Reproducible Demo

This should be reproducible on any react-native project when running XCode 12.5, but if I’m mistaken, let me know and I’ll try to put together a minimal demo.

[dburdan]

I ran into the same issue, and found the same solution as you. Temporarily fixing with the following patch-package patch: @react-native-community+cli-platform-ios+5.0.1-alpha.2.patch

diff --git a/node_modules/@react-native-community/cli-platform-ios/build/commands/runIOS/index.js b/node_modules/@react-native-community/cli-platform-ios/build/commands/runIOS/index.js
index ac4cd9f..ce330d8 100644
--- a/node_modules/@react-native-community/cli-platform-ios/build/commands/runIOS/index.js
+++ b/node_modules/@react-native-community/cli-platform-ios/build/commands/runIOS/index.js
@@ -128,7 +128,7 @@ function runIOS(_, ctx, args) {
   let devices;
 
   try {
-    devices = (0, _parseXctraceIOSDevicesList.default)(_execa().default.sync('xcrun', ['xctrace', 'list', 'devices']).stderr);
+    devices = (0, _parseXctraceIOSDevicesList.default)(_execa().default.sync('xcrun', ['xctrace', 'list', 'devices']).stdout);
   } catch (e) {
     _cliTools().logger.warn('Support for Xcode 11 and older is deprecated. Please upgrade to Xcode 12.');
 

[fredefl]

I ran into the same issue, and found the same solution as you. Temporarily fixing with the following patch-package patch: @react-native-community+cli-platform-ios+5.0.1-alpha.2.patch

diff --git a/node_modules/@react-native-community/cli-platform-ios/build/commands/runIOS/index.js b/node_modules/@react-native-community/cli-platform-ios/build/commands/runIOS/index.js
index ac4cd9f..ce330d8 100644
--- a/node_modules/@react-native-community/cli-platform-ios/build/commands/runIOS/index.js
+++ b/node_modules/@react-native-community/cli-platform-ios/build/commands/runIOS/index.js
@@ -128,7 +128,7 @@ function runIOS(_, ctx, args) {
   let devices;
 
   try {
-    devices = (0, _parseXctraceIOSDevicesList.default)(_execa().default.sync('xcrun', ['xctrace', 'list', 'devices']).stderr);
+    devices = (0, _parseXctraceIOSDevicesList.default)(_execa().default.sync('xcrun', ['xctrace', 'list', 'devices']).stdout);
   } catch (e) {
     _cliTools().logger.warn('Support for Xcode 11 and older is deprecated. Please upgrade to Xcode 12.');
 

For others waiting for this fix in a new release of the cli, apply the above patch by placing it in a file called @react-native-community+cli-platform-ios+5.0.1-alpha.2.patch in your project folder, and running:

patch -p1 < @react-native-community+cli-platform-ios+5.0.1-alpha.2.patch