build: Occasionaly fails to rename vector file after transforming during build

[ziyadvf]

When building an app, while transforming assets, the following error gets dumped (built with verbose):

Error dump

[ +19 ms] Target web_release_bundle failed: Error: User-defined transformation of asset "C:\Users\username\div\My_Cool_Flutter_App\flutter_app\assets\Icons\heart_border.svg" failed. Transformer process terminated with non-zero exit code: 255 Transformer package: vector_graphics_compiler Full command: C:\src\flutter\bin\cache\dart-sdk\bin\dart.exe run vector_graphics_compiler --input=C:\Users\username\AppData\Local\Temp\flutter_tools.9e394f6\heart_border.svg-transformOutput0.svg --output=C:\Users\username\AppData\Local\Temp\flutter_tools.9e394f6\heart_border.svg-transformOutput1.svg stdout:

       stderr:
       Cannot rename file to

'C:\Users\username\div\My_Cool_Flutter_App\flutter_app.dart_tool/pub\bin\vector_graphics_compiler\vector_graphics_compiler.dart-3.4.4.sn
apshot', path =

'C:\Users\username\div\My_Cool_Flutter_App\flutter_app.dart_tool/pub\bin\vector_graphics_compiler\tmpb6899b1\vector_graphics_compiler.da
rt-3.4.4.snapshot.incremental.temp' (OS Error: Access is denied.
, errno = 5)
PathAccessException: Cannot rename file to

'C:\Users\username\div\My_Cool_Flutter_App\flutter_app.dart_tool/pub\bin\vector_graphics_compiler\vector_graphics_compiler.dart-3.4.4.sn
apshot', path =

'C:\Users\username\div\My_Cool_Flutter_App\flutter_app.dart_tool/pub\bin\vector_graphics_compiler\tmpb6899b1\vector_graphics_compiler.da
rt-3.4.4.snapshot.incremental.temp' (OS Error: Access is denied.
, errno = 5)

       #0      throwToolExit (package:flutter_tools/src/base/common.dart:10:3)
       #1      copyAssets.<anonymous closure> (package:flutter_tools/src/build_system/targets/assets.dart:154:19)
       <asynchronous suspension>
       #2      Future.wait.<anonymous closure> (dart:async/future.dart:524:21)
       <asynchronous suspension>
       #3      copyAssets (package:flutter_tools/src/build_system/targets/assets.dart:126:3)
       <asynchronous suspension>
       #4      WebReleaseBundle.build (package:flutter_tools/src/build_system/targets/web.dart:450:29)
       <asynchronous suspension>
       #5      _BuildInstance._invokeInternal (package:flutter_tools/src/build_system/build_system.dart:875:9)
       <asynchronous suspension>
       #6      Future.wait.<anonymous closure> (dart:async/future.dart:524:21)
       <asynchronous suspension>
       #7      _BuildInstance.invokeTarget (package:flutter_tools/src/build_system/build_system.dart:813:32)
       <asynchronous suspension>
       #8      FlutterBuildSystem.build (package:flutter_tools/src/build_system/build_system.dart:642:16)
       <asynchronous suspension>
       #9      WebBuilder.buildWeb (package:flutter_tools/src/web/compile.dart:92:34)
       <asynchronous suspension>
       #10     BuildWebCommand.runCommand (package:flutter_tools/src/commands/build_web.dart:230:5)
       <asynchronous suspension>
       #11     FlutterCommand.run.<anonymous closure>
       (package:flutter_tools/src/runner/flutter_command.dart:1394:27)
       <asynchronous suspension>
       #12     AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:153:19)
       <asynchronous suspension>
       #13     CommandRunner.runCommand (package:args/command_runner.dart:212:13)
       <asynchronous suspension>
       #14     FlutterCommandRunner.runCommand.<anonymous closure>
       (package:flutter_tools/src/runner/flutter_command_runner.dart:372:9)
       <asynchronous suspension>
       #15     AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:153:19)
       <asynchronous suspension>
       #16     FlutterCommandRunner.runCommand (package:flutter_tools/src/runner/flutter_command_runner.dart:308:5)
       <asynchronous suspension>
       #17     run.<anonymous closure>.<anonymous closure> (package:flutter_tools/runner.dart:130:9)
       <asynchronous suspension>
       #18     AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:153:19)
       <asynchronous suspension>
       #19     main (package:flutter_tools/executable.dart:93:3)
       <asynchronous suspension>

[ +10 ms] Compiling lib\main.dart for the Web... (completed in 118.8s)
[ +1 ms] "flutter web" took 123,432ms.
[ +41 ms] Error: Failed to compile application for the Web.

Also, please note this is not a persistent error. Subsequently building the app WITHOUT any changes resolves it and the OS no longer throws a permission denied error when build tool tries to rename the vector file. It's a 50/50 chance of a build succeeding.