PlistBuddy无声地失败了- bug？

Question

如果我使用PlistBuddy来修改根用户拥有的plist，则命令将使用退出代码0完成。然而，plist没有被修改。当我用sudo重新运行命令时，plist会按预期进行修改。

这是PlistBuddy中的一个bug吗？它在Appium配置脚本上给我带来了一些麻烦。

我使用这个命令：

/usr/libexec/PlistBuddy -c "Add :TestTestTest dict" "$SOME_PLIST_PATH" || echo "failed"

以下是一次完整的会议：

tba $ echo "$SOME_PLIST_PATH"
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/Developer/Library/LaunchDaemons/com.apple.instruments.deviceservice.plist
tba $ ll "$SOME_PLIST_PATH"
-rw-r--r--  1 root  wheel   1.1K Jan  1 15:51 /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/Developer/Library/LaunchDaemons/com.apple.instruments.deviceservice.plist
tba $ plutil -p "$SOME_PLIST_PATH"
{
  "Program" => "/Developer/Library/PrivateFrameworks/DVTInstrumentsFoundation.framework/DTServiceHub"
  "EnvironmentVariables" => {
    "LIB_PATH" => "/usr/local/lib/node_modules/appium//node_modules/appium-instruments/thirdparty/iwd7/"
    "DYLD_INSERT_LIBRARIES" => "/usr/local/lib/node_modules/appium//node_modules/appium-instruments/thirdparty/iwd7/DTMobileISShim.dylib"
  }
  "JetsamProperties" => {
    "JetsamMemoryLimit" => 0
  }
  "POSIXSpawnType" => "Adaptive"
  "MachServices" => {
    "com.apple.instruments.deviceservice.xpc" => 1
    "com.apple.instruments.deviceservice.lockdown" => 1
  }
  "EnableTransactions" => 1
  "Label" => "com.apple.instruments.deviceservice"
}
tba $ /usr/libexec/PlistBuddy -c "Add :TestTestTest dict" "$SOME_PLIST_PATH" || echo "failed"
tba $ plutil -p "$SOME_PLIST_PATH"
{
  "Program" => "/Developer/Library/PrivateFrameworks/DVTInstrumentsFoundation.framework/DTServiceHub"
  "EnvironmentVariables" => {
    "LIB_PATH" => "/usr/local/lib/node_modules/appium//node_modules/appium-instruments/thirdparty/iwd7/"
    "DYLD_INSERT_LIBRARIES" => "/usr/local/lib/node_modules/appium//node_modules/appium-instruments/thirdparty/iwd7/DTMobileISShim.dylib"
  }
  "JetsamProperties" => {
    "JetsamMemoryLimit" => 0
  }
  "POSIXSpawnType" => "Adaptive"
  "MachServices" => {
    "com.apple.instruments.deviceservice.xpc" => 1
    "com.apple.instruments.deviceservice.lockdown" => 1
  }
  "EnableTransactions" => 1
  "Label" => "com.apple.instruments.deviceservice"
}
tba $ sudo /usr/libexec/PlistBuddy -c "Add :TestTestTest dict" "$SOME_PLIST_PATH" || echo "failed"
Password:
tba $ plutil -p "$SOME_PLIST_PATH"
{
  "Program" => "/Developer/Library/PrivateFrameworks/DVTInstrumentsFoundation.framework/DTServiceHub"
  "EnvironmentVariables" => {
    "LIB_PATH" => "/usr/local/lib/node_modules/appium//node_modules/appium-instruments/thirdparty/iwd7/"
    "DYLD_INSERT_LIBRARIES" => "/usr/local/lib/node_modules/appium//node_modules/appium-instruments/thirdparty/iwd7/DTMobileISShim.dylib"
  }
  "JetsamProperties" => {
    "JetsamMemoryLimit" => 0
  }
  "POSIXSpawnType" => "Adaptive"
  "TestTestTest" => {
  }
  "MachServices" => {
    "com.apple.instruments.deviceservice.xpc" => 1
    "com.apple.instruments.deviceservice.lockdown" => 1
  }
  "EnableTransactions" => 1
  "Label" => "com.apple.instruments.deviceservice"
}

Answer 1

PlistBuddy没有很好的文档(我在developer.apple.com上找不到它的手册页)，所以苹果很可能希望使用它的高级用户(和开发人员)知道，在处理根拥有的plist文件时，需要调用sudo。

我建议在bugreporter.apple.com上提交一个增强请求，并建议他们在PlistBuddy中添加一个"-v“(用于详细)选项，以打印添加或删除的结果。

现在，您所能做的就是打印出您试图设置的设置，如果设置不工作，则设置失败。

Answer 2

在我发现我没有对我的entitlements.plist的写访问权之前，我也一直在默默地失败，所以请确保您始终具有对正在编辑的.plist的写访问权限。

另一种选择是使用plutil，它不会默默地失败。