PlistBuddy 静默失败——错误？

Question

如果我使用 PlistBuddy 修改 root 拥有的 plist，命令以退出代码 0 完成。但是，plist 没有被修改。当我使用 sudo 重新运行命令时，plist 会按预期进行修改。

这是 PlistBuddy 中的错误吗？它在Appium configuration script 中给我带来了一些麻烦。

---

我正在使用这个命令：

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

这是一个完整的会议：

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 没有很好的文档记录（我在 developer.apple.com 上找不到它的手册页），因此 Apple 很可能希望使用它的高级用户（和开发人员）简单地知道 @处理 root 拥有的 plist 文件时需要调用 987654322@。

我建议在 bugreporter.apple.com 提交增强请求，并建议他们向 PlistBuddy 添加“-v”（用于详细）选项以打印添加或删除的结果。

目前，您所能做的就是将您尝试设置的设置打印出来，如果它不起作用，则设置因此失败。

Answer 2

在我发现我没有对我的entitlements.plist 的写访问权之前，我的 plistbuddy 也默默地失败了，因此请确保您始终拥有对正在编辑的 .plist 的写访问权。

另一种选择是使用plutil，它不会静默失败。