Hide error on mDNS registration failure and print warning in flutter attach #166782

vashworth · 2025-04-08T19:47:12Z

Publishing an mDNS service stopped working on macOS 15.4 for the iOS Simulator. DNSServiceRegister always returns a callback with error code kDNSServiceErr_PolicyDenied, as if the user had rejected the permissions popup (except no popup is ever shown). mDNS is used to discover the Dart VM when running flutter attach.

This PR does not display the error message when DNSServiceRegister fails for iOS Simulators. Instead, it prints a warning if flutter attach takes too long with instructions to either use --debug-url or to run flutter attach before running the app.

If DNSServiceRegister works again in a future macOS update, mDNS will continue to work the way it did previously.

Workaround for #166333.

Pre-launch Checklist

I read the Contributor Guide and followed the process outlined there for submitting PRs.
I read the Tree Hygiene wiki page, which explains my responsibilities.
I read and followed the Flutter Style Guide, including Features we expect every widget to implement.
I signed the CLA.
I listed at least one issue that this PR fixes in the description above.
I updated/added relevant documentation (doc comments with ///).
I added new tests to check the change I am making, or this PR is test-exempt.
I followed the breaking change policy and added Data Driven Fixes where supported.
All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-new channel on Discord.

…attach

vashworth · 2025-04-10T15:12:51Z

@cbracken Any ideas on how to test the engine part (FlutterDartVMServicePublisherDelegate)? I'm not sure how to mock it and assert the logged message.

hellohuanlin · 2025-04-15T19:59:42Z

mDNS is used to discover the Dart VM when running flutter attach.

Does it mean we can't debug Dart VM anymore?

vashworth · 2025-04-15T20:01:03Z

Does it mean we can't debug Dart VM anymore?

We can still debug the Dart VM, but when doing flutter attach, you need to use --debug-url or to run flutter attach before running the app.

hellohuanlin · 2025-04-15T20:06:31Z

packages/flutter_tools/lib/src/commands/attach.dart

+          if (device is IOSSimulator) {
+            // mDNS on simulators stopped working in macOS 15.4.
+            // See https://github.com/flutter/flutter/issues/166333.
+            return 'The Dart VM Service was not discovered after 30 seconds. '


do we also wanna ask user to click "allow" like the iOS device case? or is the permission implicitly allowed for simulator case?

Permission is implicitly disallowed for simulators. It will always fail on macOS 15 (from what I can tell). There is no settings you can change or button you can click to make it work.

Permission is implicitly disallowed for simulators.

For macOS 15 only?

For macOS 15 only?

It appears so

so for users on macOS 14-, will they be prompt? do we wanna provide them with instructions?

Mmm so I'm not 100% confident that it's solely due to macOS 15.4. There are some conflicting reports in the issue: #166333. I updated the instructions here to give both

hellohuanlin · 2025-04-15T20:09:39Z

engine/src/flutter/shell/platform/darwin/ios/framework/Source/FlutterDartVMServicePublisher.mm

        << "Could not register as server for FlutterDartVMServicePublisher, permission "
        << "denied. Check your 'Local Network' permissions for this app in the Privacy section of "
        << "the system Settings.";
+#endif  // TARGET_IPHONE_SIMULATOR


do we wanna print out the simulator case, in case developers are looking at the xcode and not the terminal? )

I'm not sure what you mean here? What would we print out?

Related to my other comment, i was thinking about something like "click allow", but I probably got it wrong.

I updated this so when targeting a simulator, it'll print a warning if debugging with verbose logs.

…e enabled

flutter-dashboard · 2025-04-16T18:35:49Z

Golden file changes have been found for this pull request. Click here to view and triage (e.g. because this is an intentional change).

If you are still iterating on this change and are not ready to resolve the images on the Flutter Gold dashboard, consider marking this PR as a draft pull request above. You will still be able to view image results on the dashboard, commenting will be silenced, and the check will not try to resolve itself until marked ready for review.

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Reviewers: Read the Tree Hygiene page and make sure this patch meets those guidelines before LGTMing.

Changes reported for pull request #166782 at sha 197c24a

…n flutter attach (flutter/flutter#166782)

flutter/flutter@aef4718...ecabb1a 2025-04-17 [email protected] Hide error on mDNS registration failure and print warning in flutter attach (flutter/flutter#166782) 2025-04-17 [email protected] Add support for language hints in TextFields (Android only) (flutter/flutter#165554) 2025-04-17 [email protected] Roll Skia from d8f13372549d to cc2b57434651 (1 revision) (flutter/flutter#167331) 2025-04-17 [email protected] Add DropdownMenu.restorationId (flutter/flutter#166684) 2025-04-17 [email protected] Roll Skia from 3d6165b70199 to d8f13372549d (14 revisions) (flutter/flutter#167325) 2025-04-17 [email protected] fix(CircularProgressIndicator.adaptive): strokeWidth default value (flutter/flutter#165370) 2025-04-17 [email protected] Remove unnecessary builder (flutter/flutter#166623) 2025-04-17 [email protected] Add a `gradle_errors.dart`entry for missing NDK source.properties file (flutter/flutter#167320) 2025-04-17 [email protected] Roll Skia from 6627deb65939 to 3d6165b70199 (1 revision) (flutter/flutter#167255) 2025-04-17 [email protected] Manual roll Dart SDK from 87965ab4864e to 992221a362ec (35 revisions) (flutter/flutter#167243) 2025-04-16 [email protected] Roll Fuchsia Linux SDK from 7bWzHwIPBTyU6R9nO... to m8Aln7fTF_8zy1V9N... (flutter/flutter#167312) 2025-04-16 [email protected] Don't throw on error for mDNS when searching for Dart VML url on core devices (flutter/flutter#167135) 2025-04-16 [email protected] Fix: Localization for non zero time in 24 hours format (flutter/flutter#164885) 2025-04-16 [email protected] Updated docstrings for TextureContents (flutter/flutter#167221) 2025-04-16 [email protected] Broke cyclical dependency with dlpath and typographer. (flutter/flutter#167293) 2025-04-16 [email protected] Set an additional CMake arg in `forceNdkDownload` to make the task name align with the `BuildType` (flutter/flutter#167240) 2025-04-16 [email protected] Fix Carousel crashes when using PageStorageKey (flutter/flutter#166817) 2025-04-16 [email protected] Revert "Removed superfluous copy in license checker (#167146)" (flutter/flutter#167246) 2025-04-16 [email protected] [native assets] Roll dependencies (flutter/flutter#167287) 2025-04-16 [email protected] Marks Linux_pixel_7pro static_path_stroke_tessellation_perf__timeline_summary to be unflaky (flutter/flutter#167259) 2025-04-16 [email protected] Feat: Add carousel view theme (flutter/flutter#164769) 2025-04-16 [email protected] Marks Mac_ios dynamic_path_stroke_tessellation_perf_ios__timeline_summary to be unflaky (flutter/flutter#167261) 2025-04-16 [email protected] When using --local-web-sdk, use a locally built Dart SDK if one is available (flutter/flutter#166732) 2025-04-16 [email protected] Added emulator version to doctor (flutter/flutter#167236) 2025-04-16 [email protected] Marks Mac_ios static_path_stroke_tessellation_perf_ios__timeline_summary to be unflaky (flutter/flutter#167260) If this roll has caused a breakage, revert this CL and stop the roller using the controls here: https://autoroll.skia.org/r/flutter-packages Please CC [email protected],[email protected] on the revert to ensure that a human is aware of the problem. To file a bug in Packages: https://github.com/flutter/flutter/issues/new/choose To report a problem with the AutoRoller itself, please file a bug: https://issues.skia.org/issues/new?component=1389291&template=1850622 Documentation for the AutoRoller is here: https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

…attach (flutter#166782) Publishing an mDNS service stopped working on macOS 15.4 for the iOS Simulator. `DNSServiceRegister` always returns a callback with error code `kDNSServiceErr_PolicyDenied`, as if the user had rejected the permissions popup (except no popup is ever shown). mDNS is used to discover the Dart VM when running `flutter attach`. This PR does not display the error message when `DNSServiceRegister` fails for iOS Simulators. Instead, it prints a warning if `flutter attach` takes too long with instructions to either use `--debug-url` or to run `flutter attach` before running the app. If `DNSServiceRegister` works again in a future macOS update, mDNS will continue to work the way it did previously. Workaround for flutter#166333. ## Pre-launch Checklist - [x] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [x] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [x] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [x] I signed the [CLA]. - [x] I listed at least one issue that this PR fixes in the description above. - [x] I updated/added relevant documentation (doc comments with `///`). - [x] I added new tests to check the change I am making, or this PR is [test-exempt]. - [x] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [x] All existing and new tests are passing. If you need help, consider asking for advice on the #hackers-new channel on [Discord].  [Contributor Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview [Tree Hygiene]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md [test-exempt]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests [Flutter Style Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md [Features we expect every widget to implement]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement [CLA]: https://cla.developers.google.com/ [flutter/tests]: https://github.com/flutter/tests [breaking change policy]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes [Discord]: https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md [Data Driven Fixes]: https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md

flutter/flutter@aef4718...ecabb1a 2025-04-17 [email protected] Hide error on mDNS registration failure and print warning in flutter attach (flutter/flutter#166782) 2025-04-17 [email protected] Add support for language hints in TextFields (Android only) (flutter/flutter#165554) 2025-04-17 [email protected] Roll Skia from d8f13372549d to cc2b57434651 (1 revision) (flutter/flutter#167331) 2025-04-17 [email protected] Add DropdownMenu.restorationId (flutter/flutter#166684) 2025-04-17 [email protected] Roll Skia from 3d6165b70199 to d8f13372549d (14 revisions) (flutter/flutter#167325) 2025-04-17 [email protected] fix(CircularProgressIndicator.adaptive): strokeWidth default value (flutter/flutter#165370) 2025-04-17 [email protected] Remove unnecessary builder (flutter/flutter#166623) 2025-04-17 [email protected] Add a `gradle_errors.dart`entry for missing NDK source.properties file (flutter/flutter#167320) 2025-04-17 [email protected] Roll Skia from 6627deb65939 to 3d6165b70199 (1 revision) (flutter/flutter#167255) 2025-04-17 [email protected] Manual roll Dart SDK from 87965ab4864e to 992221a362ec (35 revisions) (flutter/flutter#167243) 2025-04-16 [email protected] Roll Fuchsia Linux SDK from 7bWzHwIPBTyU6R9nO... to m8Aln7fTF_8zy1V9N... (flutter/flutter#167312) 2025-04-16 [email protected] Don't throw on error for mDNS when searching for Dart VML url on core devices (flutter/flutter#167135) 2025-04-16 [email protected] Fix: Localization for non zero time in 24 hours format (flutter/flutter#164885) 2025-04-16 [email protected] Updated docstrings for TextureContents (flutter/flutter#167221) 2025-04-16 [email protected] Broke cyclical dependency with dlpath and typographer. (flutter/flutter#167293) 2025-04-16 [email protected] Set an additional CMake arg in `forceNdkDownload` to make the task name align with the `BuildType` (flutter/flutter#167240) 2025-04-16 [email protected] Fix Carousel crashes when using PageStorageKey (flutter/flutter#166817) 2025-04-16 [email protected] Revert "Removed superfluous copy in license checker (#167146)" (flutter/flutter#167246) 2025-04-16 [email protected] [native assets] Roll dependencies (flutter/flutter#167287) 2025-04-16 [email protected] Marks Linux_pixel_7pro static_path_stroke_tessellation_perf__timeline_summary to be unflaky (flutter/flutter#167259) 2025-04-16 [email protected] Feat: Add carousel view theme (flutter/flutter#164769) 2025-04-16 [email protected] Marks Mac_ios dynamic_path_stroke_tessellation_perf_ios__timeline_summary to be unflaky (flutter/flutter#167261) 2025-04-16 [email protected] When using --local-web-sdk, use a locally built Dart SDK if one is available (flutter/flutter#166732) 2025-04-16 [email protected] Added emulator version to doctor (flutter/flutter#167236) 2025-04-16 [email protected] Marks Mac_ios static_path_stroke_tessellation_perf_ios__timeline_summary to be unflaky (flutter/flutter#167260) If this roll has caused a breakage, revert this CL and stop the roller using the controls here: https://autoroll.skia.org/r/flutter-packages Please CC [email protected],[email protected] on the revert to ensure that a human is aware of the problem. To file a bug in Packages: https://github.com/flutter/flutter/issues/new/choose To report a problem with the AutoRoller itself, please file a bug: https://issues.skia.org/issues/new?component=1389291&template=1850622 Documentation for the AutoRoller is here: https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

…r#9104) flutter/flutter@aef4718...ecabb1a 2025-04-17 [email protected] Hide error on mDNS registration failure and print warning in flutter attach (flutter/flutter#166782) 2025-04-17 [email protected] Add support for language hints in TextFields (Android only) (flutter/flutter#165554) 2025-04-17 [email protected] Roll Skia from d8f13372549d to cc2b57434651 (1 revision) (flutter/flutter#167331) 2025-04-17 [email protected] Add DropdownMenu.restorationId (flutter/flutter#166684) 2025-04-17 [email protected] Roll Skia from 3d6165b70199 to d8f13372549d (14 revisions) (flutter/flutter#167325) 2025-04-17 [email protected] fix(CircularProgressIndicator.adaptive): strokeWidth default value (flutter/flutter#165370) 2025-04-17 [email protected] Remove unnecessary builder (flutter/flutter#166623) 2025-04-17 [email protected] Add a `gradle_errors.dart`entry for missing NDK source.properties file (flutter/flutter#167320) 2025-04-17 [email protected] Roll Skia from 6627deb65939 to 3d6165b70199 (1 revision) (flutter/flutter#167255) 2025-04-17 [email protected] Manual roll Dart SDK from 87965ab4864e to 992221a362ec (35 revisions) (flutter/flutter#167243) 2025-04-16 [email protected] Roll Fuchsia Linux SDK from 7bWzHwIPBTyU6R9nO... to m8Aln7fTF_8zy1V9N... (flutter/flutter#167312) 2025-04-16 [email protected] Don't throw on error for mDNS when searching for Dart VML url on core devices (flutter/flutter#167135) 2025-04-16 [email protected] Fix: Localization for non zero time in 24 hours format (flutter/flutter#164885) 2025-04-16 [email protected] Updated docstrings for TextureContents (flutter/flutter#167221) 2025-04-16 [email protected] Broke cyclical dependency with dlpath and typographer. (flutter/flutter#167293) 2025-04-16 [email protected] Set an additional CMake arg in `forceNdkDownload` to make the task name align with the `BuildType` (flutter/flutter#167240) 2025-04-16 [email protected] Fix Carousel crashes when using PageStorageKey (flutter/flutter#166817) 2025-04-16 [email protected] Revert "Removed superfluous copy in license checker (#167146)" (flutter/flutter#167246) 2025-04-16 [email protected] [native assets] Roll dependencies (flutter/flutter#167287) 2025-04-16 [email protected] Marks Linux_pixel_7pro static_path_stroke_tessellation_perf__timeline_summary to be unflaky (flutter/flutter#167259) 2025-04-16 [email protected] Feat: Add carousel view theme (flutter/flutter#164769) 2025-04-16 [email protected] Marks Mac_ios dynamic_path_stroke_tessellation_perf_ios__timeline_summary to be unflaky (flutter/flutter#167261) 2025-04-16 [email protected] When using --local-web-sdk, use a locally built Dart SDK if one is available (flutter/flutter#166732) 2025-04-16 [email protected] Added emulator version to doctor (flutter/flutter#167236) 2025-04-16 [email protected] Marks Mac_ios static_path_stroke_tessellation_perf_ios__timeline_summary to be unflaky (flutter/flutter#167260) If this roll has caused a breakage, revert this CL and stop the roller using the controls here: https://autoroll.skia.org/r/flutter-packages Please CC [email protected],[email protected] on the revert to ensure that a human is aware of the problem. To file a bug in Packages: https://github.com/flutter/flutter/issues/new/choose To report a problem with the AutoRoller itself, please file a bug: https://issues.skia.org/issues/new?component=1389291&template=1850622 Documentation for the AutoRoller is here: https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

…n flutter attach (flutter/flutter#166782)

…attach (flutter#166782) Publishing an mDNS service stopped working on macOS 15.4 for the iOS Simulator. `DNSServiceRegister` always returns a callback with error code `kDNSServiceErr_PolicyDenied`, as if the user had rejected the permissions popup (except no popup is ever shown). mDNS is used to discover the Dart VM when running `flutter attach`. This PR does not display the error message when `DNSServiceRegister` fails for iOS Simulators. Instead, it prints a warning if `flutter attach` takes too long with instructions to either use `--debug-url` or to run `flutter attach` before running the app. If `DNSServiceRegister` works again in a future macOS update, mDNS will continue to work the way it did previously. Workaround for flutter#166333. ## Pre-launch Checklist - [x] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [x] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [x] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [x] I signed the [CLA]. - [x] I listed at least one issue that this PR fixes in the description above. - [x] I updated/added relevant documentation (doc comments with `///`). - [x] I added new tests to check the change I am making, or this PR is [test-exempt]. - [x] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [x] All existing and new tests are passing. If you need help, consider asking for advice on the #hackers-new channel on [Discord].  [Contributor Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview [Tree Hygiene]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md [test-exempt]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests [Flutter Style Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md [Features we expect every widget to implement]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement [CLA]: https://cla.developers.google.com/ [flutter/tests]: https://github.com/flutter/tests [breaking change policy]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes [Discord]: https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md [Data Driven Fixes]: https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md

…n flutter attach (flutter/flutter#166782)

Hide error on mDNS registration failure and print warning in flutter …

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…attach

github-actions bot added platform-ios iOS applications specifically tool Affects the "flutter" command-line tool. See also t: labels. engine flutter/engine related. See also e: labels. team-ios Owned by iOS platform team labels Apr 8, 2025

add test

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vashworth marked this pull request as ready for review April 10, 2025 15:11

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vashworth and others added 3 commits April 15, 2025 15:26

Merge branch 'master' into simulator_attach_workaround

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Update warning message

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Change simulator error so it shows in debug mode when verbose logs ar…

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Merge branch 'master' into simulator_attach_workaround

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Roll Flutter from aef4718b3956 to ecabb1a05212 (25 revisions) flutter/packages#9104

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…n flutter attach (flutter/flutter#166782)

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[Mac-15][iOS Simulator] Could not register as server for FlutterDartVMServicePublisher, permission denied. Check your 'Local Network' permissions for this app in the Privacy section of the system Settings. #166333

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…n flutter attach (flutter/flutter#166782)

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…n flutter attach (flutter/flutter#166782)

Hide error on mDNS registration failure and print warning in flutter attach #166782

Hide error on mDNS registration failure and print warning in flutter attach #166782

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flutter-dashboard bot commented Apr 16, 2025

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vashworth commented Apr 8, 2025 •

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vashworth Apr 15, 2025 •

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vashworth Apr 15, 2025 •

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