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"Welcome to Flutter" and "Waiting for lock" messages break --machine commands #54014
Description
sudo flutter channel --version --machine is responding with a non json output, this break other toolkit/ci-cd that are relying on this --machine flag go-flutter-desktop/go-flutter#384.
$ sudo flutter channel --version --machine
Woah! You appear to be trying to run flutter as root.
We strongly recommend running the flutter tool without superuser privileges.
/
📎
{
"frameworkVersion": "1.16.4-pre.88",
"channel": "master",
"repositoryUrl": "https://github.com/flutter/flutter.git",
"frameworkRevision": "ab14307e0c77e4a03ea23ccaa68436d9128a445d",
"frameworkCommitDate": "2020-04-03 00:56:01 -0400",
"engineRevision": "f5127cc07a762de774b7e941fe6eb402c97aa1b3",
"dartSdkVersion": "2.8.0 (build 2.8.0-dev.19.0 fae35fca47)"
}
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║ Welcome to Flutter! - https://flutter.dev ║
║ ║
║ The Flutter tool uses Google Analytics to anonymously report feature usage ║
║ statistics and basic crash reports. This data is used to help improve ║
║ Flutter tools over time. ║
║ ║
║ Flutter tool analytics are not sent on the very first run. To disable ║
║ reporting, type 'flutter config --no-analytics'. To display the current ║
║ setting, type 'flutter config'. If you opt out of analytics, an opt-out ║
║ event will be sent, and then no further information will be sent by the ║
║ Flutter tool. ║
║ ║
║ By downloading the Flutter SDK, you agree to the Google Terms of Service. ║
║ Note: The Google Privacy Policy describes how data is handled in this ║
║ service. ║
║ ║
║ Moreover, Flutter includes the Dart SDK, which may send usage metrics and ║
║ crash reports to Google. ║
║ ║
║ Read about data we send with crash reports: ║
║ https://flutter.dev/docs/reference/crash-reporting ║
║ ║
║ See Google's privacy policy: ║
║ https://policies.google.com/privacy ║
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Activity
pchampio commentedon Apr 21, 2020
GeertJohan commentedon Apr 21, 2020
The non-JSON output can be written to stderr, so that stdout is still 'clean' for machines to read.
[-]Tookit flutter --machine returns non json string[/-][+]"Welcome to Flutter" and "Waiting for lock" messages break --machine commands[/+]jonahwilliams commentedon Sep 25, 2020
We've moved some of the diagnostic messages to stderr, though this does not yet include the welcome message. This could be fixed by detecting if a machine flag was passed and eliding it.
sigurdm commentedon Jun 2, 2022
Is there any reason to not always output the welcome message on stderr?
christopherfujino commentedon Mar 7, 2023
I believe there have been concerns (from product) that the default command prompt setup on Windows colors STDERR red, and that too much red would scare new users.
AbdeMohlbi commentedon Apr 6, 2026
seems
sudo flutter analyze --suggestions --machinealso have the same problem.Make the welcome message output to stderr if --machine (flutter#184819)
github-actions commentedon May 18, 2026
This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of
flutter doctor -vand a minimal reproduction of the issue.