[flutter_tools] FileSystemException Exists failed, path = 'D:\D:\android\app'

[christopherfujino]

On stable/3.0.1

flutter --no-color create --template app --description A new Flutter project. --org com.example --platforms android,ios --project-name project_name D:

FileSystemException: Exists failed, path = 'D:\D:\android\app' (OS Error: The filename, directory name, or volume label syntax is incorrect., errno = 123)
at _Directory.existsSync(directory_impl.dart:94)
at ForwardingFileSystemEntity.existsSync(forwarding_file_system_entity.dart:43)
at ErrorHandlingDirectory.existsSync.<anonymous closure>(error_handling_io.dart:497)
at _runSync(error_handling_io.dart:597)
at ErrorHandlingDirectory.existsSync(error_handling_io.dart:496)
at CreateBase.determineTemplateType.exists(create_base.dart:230)
at CreateBase.determineTemplateType(create_base.dart:236)
at CreateCommand._getProjectType(create.dart:170)
at CreateCommand.runCommand(create.dart:210)
at FlutterCommand.verifyThenRunCommand(flutter_command.dart:1342)
at <asynchronous gap>(async)
at FlutterCommand.run.<anonymous closure>(flutter_command.dart:1183)
at <asynchronous gap>(async)
at AppContext.run.<anonymous closure>(context.dart:150)
at <asynchronous gap>(async)
at CommandRunner.runCommand(command_runner.dart:209)
at <asynchronous gap>(async)
at FlutterCommandRunner.runCommand.<anonymous closure>(flutter_command_runner.dart:281)
at <asynchronous gap>(async)
at AppContext.run.<anonymous closure>(context.dart:150)
at <asynchronous gap>(async)
at FlutterCommandRunner.runCommand(flutter_command_runner.dart:229)
at <asynchronous gap>(async)
at run.<anonymous closure>.<anonymous closure>(runner.dart:62)
at <asynchronous gap>(async)
at AppContext.run.<anonymous closure>(context.dart:150)
at <asynchronous gap>(async)
at main(executable.dart:94)
at <asynchronous gap>(async)

[christopherfujino]

This is likely a tool bug that we are trying to append a path with a drive to an already valid path, D:.

[christopherfujino]

Hmm, I can't reproduce this locally, and from reading the code it's not obvious to me how this can happen. It looks to me like we're creating projectDir as globals.fs.directory(argResults.rest.first) (in the above example, argResults.rest.first should be 'D:'), and then joining that like globals.fs.path.joinAll(projectDir.absolute.path, ...<String>['android', 'app']), which in the above stacktrace seems to be resolving to 'D:\D:\android\app', however locally for me projectDir.absolute.path appears to resolve to the working directory?!

[christopherfujino]

It looks like, per dart:io, D: is not a valid windows path (although D:\ is) https://github.com/dart-lang/sdk/blob/main/sdk/lib/io/file_system_entity.dart#L506

static final RegExp _absoluteWindowsPathPattern =
      new RegExp(r'^(?:\\\\|[a-zA-Z]:[/\\])');

[christopherfujino]

Then it looks like the fallback is to treat it like a relative path, and run it through this function: https://github.com/dart-lang/sdk/blob/main/sdk/lib/io/file_system_entity.dart#L571

[github-actions]

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