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Flutter开发：运行flutter upgrade命令报错Exception：Flutter failed to create a directory at…解决方法

2022-07-17 00:43:00 【InfoQ】

前言

在Flutter开发中，经常会遇到因为更新而引起的报错，而且最近两年Flutter不断完善和更新的速度越来越快，这就需要Flutter相关的开发者时刻保持不断学习的心态，来应对在Flutter开发中遇到的各种突发情况。本篇博文就来分享一下关于Flutter开发中执行flutter upgrade命令之后报错Exception：Flutter failed to create a directory at…的解决方法，方便后期查阅使用。

报错提示

在终端中运行flutter upgrade命令之后，提示如下报错信息：

adminBook-Pro ~ % flutter upgrade&nbsp;

Unhandled exception:&nbsp;

Exception: Flutter failed to create a directory at &quot;/Users/admin/.config/&nbsp;

flutter&quot;. The flutter tool cannot access the file or directory.&nbsp;

Please ensure that the SDK and/or project is installed in a location that has&nbsp;

read/write permissions for the current user.&nbsp;

#0 throwToolExit (package:flutter_tools/src/base/common.dart:10:3)&nbsp;

#1 _throwFileSystemException (package:flutter_tools/src/base/&nbsp;

error_handling_io.dart:749:3)&nbsp;

#2 _handlePosixException (package:flutter_tools/src/base/&nbsp;

error_handling_io.dart:697:3)&nbsp;

#3 _runSync (package:flutter_tools/src/base/&nbsp;

error_handling_io.dart:561:7)&nbsp;

#4 ErrorHandlingDirectory.createSync (package:flutter_tools/src/base/&nbsp;

error_handling_io.dart:408:12)&nbsp;

#5 new Config (package:flutter_tools/src/base/config.dart:33:17)&nbsp;

#6 new _DefaultPersistentToolState (package:flutter_tools/src/&nbsp;

persistent_tool_state.dart:65:18)&nbsp;

#7 new PersistentToolState (package:flutter_tools/src/&nbsp;

persistent_tool_state.dart:21:9)&nbsp;

#8 runInContext.<anonymous closure> (package:flutter_tools/src/&nbsp;

context_runner.dart:257:34)&nbsp;

#9 AppContext._generateIfNecessary.<anonymous closure>&nbsp;

(package:flutter_tools/src/base/context.dart:104:41)&nbsp;

#10 _LinkedHashMapMixin.putIfAbsent (dart:collection-patch/&nbsp;

compact_hash.dart:311:23)&nbsp;

#11 AppContext._generateIfNecessary (package:flutter_tools/src/base/&nbsp;

context.dart:92:20)&nbsp;

#12 AppContext.get (package:flutter_tools/src/base/&nbsp;

context.dart:121:32)&nbsp;

#13 PersistentToolState.instance (package:flutter_tools/src/&nbsp;

persistent_tool_state.dart:35:54)&nbsp;

#14 persistentToolState (package:flutter_tools/src/globals.dart:53:68)&nbsp;

#15 _defaultBotDetector (package:flutter_tools/src/globals.dart:112:24)&nbsp;

#16 _defaultBotDetector (package:flutter_tools/src/globals.dart)&nbsp;

#17 botDetector (package:flutter_tools/src/globals.dart:115:62)&nbsp;

#18 isRunningOnBot (package:flutter_tools/src/globals.dart:117:36)&nbsp;

#19 runInContext.runnerWrapper (package:flutter_tools/src/&nbsp;

context_runner.dart:69:34)&nbsp;

#20 runInContext.runnerWrapper (package:flutter_tools/src/&nbsp;

context_runner.dart:68:28)&nbsp;

#21 AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:150:29)&nbsp;

#22 AppContext.run.<anonymous closure> (package:flutter_tools/src/&nbsp;

base/context.dart:150:7)&nbsp;

#23 _rootRun (dart:async/zone.dart:1354:13)&nbsp;

#24 _CustomZone.run (dart:async/zone.dart:1258:19)&nbsp;

#25 _runZoned (dart:async/zone.dart:1788:10)&nbsp;

#26 runZoned (dart:async/zone.dart:1710:10)&nbsp;

#27 AppContext.run (package:flutter_tools/src/base/&nbsp;

context.dart:149:18)&nbsp;

#28 runInContext (package:flutter_tools/src/context_runner.dart:73:24)&nbsp;

#29 run (package:flutter_tools/runner.dart:47:10)&nbsp;

#30 main (package:flutter_tools/executable.dart:90:9)&nbsp;

#31 main (file:///opt/s/w/ir/k/archive/flutter/packages/flutter_tools/bin/&nbsp;

flutter_tools.dart:8:3)&nbsp;

#32 _delayEntrypointInvocation.<anonymous closure> (dart:isolate

patch/isolate_patch.dart:281:32)&nbsp;

#33 _RawReceivePortImpl._handleMessage (dart:isolate-patch/&nbsp;

isolate_patch.dart:184:12)

分析

虽然终端提示的报错这么长一坨，其实关键的一句是“Please ensure that the SDK and/or project is installed in a location that has read/write permissions for the current user.”，由于在更新这些库的时候操作文件权限不够造成的，这就需要提高操作文件的权限然后再去执行flutter upgrade命令。

解决方法

1、直接在终端中输入命令：

ls -la 

2、接着执行命令：

chmod 777 .config

执行完chmod 777 .config该命令行之后，终端会提示：

chmod: Unable to change file mode on .config: Operation not permitted。

3、再次执行如下命令行：

sudo chmod 777 .config

执行完之后就成功了，然后再次重新执行因为权限不够的命令行

4、最后再次执行命令行：

flutter upgrade 

执行之后的结果更新成功，不在提示没有权限，不在报错，这样问题完美解决。

最后

        通过上面介绍的关于Flutter开发中运行flutter upgrade命令报错Exception：Flutter failed to create a directory at…的解决方法步骤，以后再遇到类似因为权限不够更新失败的问题就迎刃而解了，尤其是对于刚接触Flutter开发不久的开发者来说，更应该掌握这种情况的解决方法，这里不再赘述。

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