FileSystemException: Creation of temporary directory failed, path = '.../flutter_tools.' (OS Error: No space left on device, errno = 28)

[andrewkolos]

On 3.24.0 as of 8/20: 67 reports by 20 unique clients.

Possibly shares a root cause with #142537.

Flutter CLI commands (at least from first 10 reports): flutter run, flutter test integration_test

I'm fairly certain the tool has constructs to handle out-of-storage errors in its ErrorHandling* file system abstractions, but something might be leaking here.

FileSystemException: Creation of temporary directory failed, path = '/var/folders/7j/0l_gjs0d7vx87_j12jr1zk3m0000gq/T/flutter_tools.' (OS Error: No space left on device, errno = 28)
at _Directory.createTempSync(directory_impl.dart:170)
at ForwardingDirectory.createTempSync(forwarding_directory.dart:28)
at LocalFileSystem.systemTempDirectory(file_system.dart:236)
at ForwardingFileSystem.systemTempDirectory(forwarding_file_system.dart:33)
at IOSCoreDeviceControl._listCoreDevices(core_devices.dart:65)
at IOSCoreDeviceControl.getCoreDevices(core_devices.dart:122)
at XCDevice.getAvailableIOSDevices(xcdevice.dart:487)
at <asynchronous gap>(async)
at PollingDeviceDiscovery._populateDevices(device.dart:547)
at <asynchronous gap>(async)
at Future.wait.<anonymous closure>(future.dart:524)
at <asynchronous gap>(async)
at DeviceManager.getAllDevices(device.dart:198)
at <asynchronous gap>(async)
at DeviceBasedDevelopmentArtifacts.requiredArtifacts(flutter_command.dart:1908)
at <asynchronous gap>(async)
at FlutterCommand.verifyThenRunCommand(flutter_command.dart:1692)
at <asynchronous gap>(async)
at FlutterCommand.run.<anonymous closure>(flutter_command.dart:1394)
at <asynchronous gap>(async)
at AppContext.run.<anonymous closure>(context.dart:153)
at <asynchronous gap>(async)
at CommandRunner.runCommand(command_runner.dart:212)
at <asynchronous gap>(async)
at FlutterCommandRunner.runCommand.<anonymous closure>(flutter_command_runner.dart:372)
at <asynchronous gap>(async)
at AppContext.run.<anonymous closure>(context.dart:153)
at <asynchronous gap>(async)
at FlutterCommandRunner.runCommand(flutter_command_runner.dart:308)
at <asynchronous gap>(async)
at run.<anonymous closure>.<anonymous closure>(runner.dart:130)
at <asynchronous gap>(async)
at AppContext.run.<anonymous closure>(context.dart:153)
at <asynchronous gap>(async)
at main(executable.dart:93)
at <asynchronous gap>(async)

[andrewkolos]

Oh, okay. I figured out what is happening here.

The filesystem called upon in IOSCoreDeviceControl._listCoreDevices should be a ErrorHandlingFileSystem. Let's examine ErrorHandlingFileSystem's implementation of systemTempDirectory:

flutter/packages/flutter_tools/lib/src/base/error_handling_io.dart

Lines 126 to 128 in 30835d7

	Directory get systemTempDirectory {
	return directory(delegate.systemTempDirectory);
	}

What I think is happening is that delegate is an instance of LocalFileSystem (not to be confused with the LocalFileSystem provided by package:file). LocalFileSystem's override of systemTempDirectory will actually create and return a new directory within the actual system temp directory. This is the source of the at _Directory.createTempSync(directory_impl.dart:170) at the top of the stack.

TL;DR: referencingFileSystem.systemTempDirectory can result in a create operation, so we need to wrap this in filesystem-exception-handling logic.

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