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Copy CoreFX environment variable code
Tweak the core code to match up with what we had done in CoreFX and expose so that we can have a single source of environment truth. This is particularly important for Unix as we use a local copy of the state.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,101 @@ | ||
| // Licensed to the .NET Foundation under one or more agreements. | ||
| // The .NET Foundation licenses this file to you under the MIT license. | ||
| // See the LICENSE file in the project root for more information. | ||
|
|
||
| using System.Collections; | ||
| using System.Collections.Generic; | ||
|
|
||
| namespace System | ||
| { | ||
| public static partial class Environment | ||
| { | ||
| private static readonly unsafe Lazy<Dictionary<string, string>> s_environ = new Lazy<Dictionary<string, string>>(() => | ||
| { | ||
| // We cache on Unix as using the block isn't thread safe | ||
| return GetRawEnvironmentVariables(); | ||
| }); | ||
|
|
||
| private static string GetEnvironmentVariableCore(string variable) | ||
| { | ||
| // Ensure variable doesn't include a null char | ||
| int nullEnd = variable.IndexOf('\0'); | ||
| if (nullEnd != -1) | ||
| { | ||
| variable = variable.Substring(0, nullEnd); | ||
| } | ||
|
|
||
| // Get the value of the variable | ||
| lock (s_environ) | ||
| { | ||
| string value; | ||
| return s_environ.Value.TryGetValue(variable, out value) ? value : null; | ||
| } | ||
| } | ||
|
|
||
| private static string GetEnvironmentVariableCore(string variable, EnvironmentVariableTarget target) | ||
| { | ||
| return target == EnvironmentVariableTarget.Process ? | ||
| GetEnvironmentVariableCore(variable) : | ||
| null; | ||
| } | ||
|
|
||
| private static IDictionary GetEnvironmentVariablesCore() | ||
| { | ||
| lock (s_environ) | ||
| { | ||
| return new Dictionary<string, string>(s_environ.Value); | ||
| } | ||
| } | ||
|
|
||
| private static IDictionary GetEnvironmentVariablesCore(EnvironmentVariableTarget target) | ||
| { | ||
| return target == EnvironmentVariableTarget.Process ? | ||
| GetEnvironmentVariablesCore() : | ||
| new Dictionary<string, string>(); | ||
| } | ||
|
|
||
| private static void SetEnvironmentVariableCore(string variable, string value) | ||
| { | ||
| int nullEnd; | ||
|
|
||
| // Ensure variable doesn't include a null char | ||
| nullEnd = variable.IndexOf('\0'); | ||
| if (nullEnd != -1) | ||
| { | ||
| variable = variable.Substring(0, nullEnd); | ||
| } | ||
|
|
||
| // Ensure value doesn't include a null char | ||
| if (value != null) | ||
| { | ||
| nullEnd = value.IndexOf('\0'); | ||
| if (nullEnd != -1) | ||
| { | ||
| value = value.Substring(0, nullEnd); | ||
| } | ||
| } | ||
|
|
||
| lock (s_environ) | ||
| { | ||
| // Remove the entry if the value is null, otherwise add/overwrite it | ||
| if (value == null) | ||
| { | ||
| s_environ.Value.Remove(variable); | ||
| } | ||
| else | ||
| { | ||
| s_environ.Value[variable] = value; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| private static void SetEnvironmentVariableCore(string variable, string value, EnvironmentVariableTarget target) | ||
| { | ||
| if (target == EnvironmentVariableTarget.Process) | ||
| { | ||
| SetEnvironmentVariableCore(variable, value); | ||
| } | ||
| // other targets ignored | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,226 @@ | ||
| // Licensed to the .NET Foundation under one or more agreements. | ||
| // The .NET Foundation licenses this file to you under the MIT license. | ||
| // See the LICENSE file in the project root for more information. | ||
|
|
||
| using Microsoft.Win32; | ||
| using System.Collections; | ||
| using System.Collections.Generic; | ||
| using System.Runtime.InteropServices; | ||
| using System.Text; | ||
|
|
||
| namespace System | ||
| { | ||
| public static partial class Environment | ||
| { | ||
| private static string GetEnvironmentVariableCore(string variable) | ||
| { | ||
| if (AppDomain.IsAppXModel() && !AppDomain.IsAppXDesignMode()) | ||
| { | ||
| // Environment variable accessors are not approved modern API. | ||
| // Behave as if the variable was not found in this case. | ||
| return null; | ||
| } | ||
|
|
||
| StringBuilder sb = StringBuilderCache.Acquire(128); // A somewhat reasonable default size | ||
| int requiredSize = Win32Native.GetEnvironmentVariable(variable, sb, sb.Capacity); | ||
|
|
||
| if (requiredSize == 0 && Marshal.GetLastWin32Error() == Win32Native.ERROR_ENVVAR_NOT_FOUND) | ||
| { | ||
| StringBuilderCache.Release(sb); | ||
| return null; | ||
| } | ||
|
|
||
| while (requiredSize > sb.Capacity) | ||
| { | ||
| sb.Capacity = requiredSize; | ||
| sb.Length = 0; | ||
| requiredSize = Win32Native.GetEnvironmentVariable(variable, sb, sb.Capacity); | ||
| } | ||
|
|
||
| return StringBuilderCache.GetStringAndRelease(sb); | ||
| } | ||
|
|
||
| private static string GetEnvironmentVariableCore(string variable, EnvironmentVariableTarget target) | ||
| { | ||
| if (target == EnvironmentVariableTarget.Process) | ||
| return GetEnvironmentVariableCore(variable); | ||
|
|
||
| #if FEATURE_WIN32_REGISTRY | ||
| RegistryKey baseKey; | ||
| string keyName; | ||
|
|
||
| if (target == EnvironmentVariableTarget.Machine) | ||
| { | ||
| baseKey = Registry.LocalMachine; | ||
| keyName = @"System\CurrentControlSet\Control\Session Manager\Environment"; | ||
| } | ||
| else if (target == EnvironmentVariableTarget.User) | ||
| { | ||
| Debug.Assert(target == EnvironmentVariableTarget.User); | ||
| baseKey = Registry.CurrentUser; | ||
| keyName = "Environment"; | ||
| } | ||
| else | ||
| { | ||
| throw new ArgumentException(GetResourceString("Arg_EnumIllegalVal", (int)target)); | ||
| } | ||
|
|
||
| using (RegistryKey environmentKey = baseKey.OpenSubKey(keyName, writable: false)) | ||
| { | ||
| return environmentKey?.GetValue(variable) as string; | ||
| } | ||
| #else | ||
| throw new ArgumentException(GetResourceString("Arg_EnumIllegalVal", (int)target)); | ||
| #endif | ||
| } | ||
|
|
||
| private static IDictionary GetEnvironmentVariablesCore() | ||
| { | ||
| if (AppDomain.IsAppXModel() && !AppDomain.IsAppXDesignMode()) | ||
| { | ||
| // Environment variable accessors are not approved modern API. | ||
| // Behave as if no environment variables are defined in this case. | ||
| return new Hashtable(0); | ||
| } | ||
|
|
||
| return GetRawEnvironmentVariables(); | ||
| } | ||
|
|
||
| private static IDictionary GetEnvironmentVariablesCore(EnvironmentVariableTarget target) | ||
| { | ||
| if (target == EnvironmentVariableTarget.Process) | ||
| return GetEnvironmentVariablesCore(); | ||
|
|
||
| #if FEATURE_WIN32_REGISTRY | ||
| RegistryKey baseKey; | ||
| string keyName; | ||
| if (target == EnvironmentVariableTarget.Machine) | ||
| { | ||
| baseKey = Registry.LocalMachine; | ||
| keyName = @"System\CurrentControlSet\Control\Session Manager\Environment"; | ||
| } | ||
| else if (target == EnvironmentVariableTarget.User) | ||
| { | ||
| Debug.Assert(target == EnvironmentVariableTarget.User); | ||
| baseKey = Registry.CurrentUser; | ||
| keyName = @"Environment"; | ||
| } | ||
| else | ||
| { | ||
| throw new ArgumentException(GetResourceString("Arg_EnumIllegalVal", (int)target)); | ||
| } | ||
|
|
||
| using (RegistryKey environmentKey = baseKey.OpenSubKey(keyName, writable: false)) | ||
| { | ||
| var table = new Dictionary<string, string>(); | ||
| if (environmentKey != null) | ||
| { | ||
| foreach (string name in environmentKey.GetValueNames()) | ||
| { | ||
| table.Add(name, environmentKey.GetValue(name, "").ToString()); | ||
| } | ||
| } | ||
| return table; | ||
| } | ||
| #endif // FEATURE_WIN32_REGISTRY | ||
|
|
||
| throw new ArgumentException(GetResourceString("Arg_EnumIllegalVal", (int)target)); | ||
| } | ||
|
|
||
| private static void SetEnvironmentVariableCore(string variable, string value) | ||
| { | ||
| // explicitly null out value if is the empty string. | ||
| if (string.IsNullOrEmpty(value) || value[0] == '\0') | ||
| value = null; | ||
|
|
||
| if (AppDomain.IsAppXModel() && !AppDomain.IsAppXDesignMode()) | ||
| { | ||
| // Environment variable accessors are not approved modern API. | ||
| // so we throw PlatformNotSupportedException. | ||
| throw new PlatformNotSupportedException(); | ||
| } | ||
|
|
||
| if (!Win32Native.SetEnvironmentVariable(variable, value)) | ||
| { | ||
| int errorCode = Marshal.GetLastWin32Error(); | ||
|
|
||
| switch (errorCode) | ||
| { | ||
| case Win32Native.ERROR_ENVVAR_NOT_FOUND: | ||
| // Allow user to try to clear a environment variable | ||
| return; | ||
| case Win32Native.ERROR_FILENAME_EXCED_RANGE: | ||
| // The error message from Win32 is "The filename or extension is too long", | ||
| // which is not accurate. | ||
| throw new ArgumentException(GetResourceString("Argument_LongEnvVarValue")); | ||
| default: | ||
| throw new ArgumentException(Win32Native.GetMessage(errorCode)); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| private static void SetEnvironmentVariableCore(string variable, string value, EnvironmentVariableTarget target) | ||
| { | ||
| if (target == EnvironmentVariableTarget.Process) | ||
| { | ||
| SetEnvironmentVariableCore(variable, value); | ||
| return; | ||
| } | ||
|
|
||
| // explicitly null out value if is the empty string. | ||
| if (string.IsNullOrEmpty(value) || value[0] == '\0') | ||
| value = null; | ||
|
|
||
| #if FEATURE_WIN32_REGISTRY | ||
| RegistryKey baseKey; | ||
| string keyName; | ||
|
|
||
| if (target == EnvironmentVariableTarget.Machine) | ||
| { | ||
| baseKey = Registry.LocalMachine; | ||
| keyName = @"System\CurrentControlSet\Control\Session Manager\Environment"; | ||
| } | ||
| else if (target == EnvironmentVariableTarget.User) | ||
| { | ||
| Debug.Assert(target == EnvironmentVariableTarget.User); | ||
|
|
||
| // User-wide environment variables stored in the registry are limited to 255 chars for the environment variable name. | ||
| const int MaxUserEnvVariableLength = 255; | ||
| if (variable.Length >= MaxUserEnvVariableLength) | ||
| { | ||
| throw new ArgumentException(GetResourceString("Argument_LongEnvVarValue"), nameof(variable)); | ||
| } | ||
|
|
||
| baseKey = Registry.CurrentUser; | ||
| keyName = "Environment"; | ||
| } | ||
| else | ||
| { | ||
| throw new ArgumentException(GetResourceString("Arg_EnumIllegalVal", (int)target)); | ||
| } | ||
|
|
||
| using (RegistryKey environmentKey = baseKey.OpenSubKey(keyName, writable: true)) | ||
| { | ||
| if (environmentKey != null) | ||
| { | ||
| if (value == null) | ||
| { | ||
| environmentKey.DeleteValue(variable, throwOnMissingValue: false); | ||
| } | ||
| else | ||
| { | ||
| environmentKey.SetValue(variable, value); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| // send a WM_SETTINGCHANGE message to all windows | ||
| IntPtr r = Win32Native.SendMessageTimeout(new IntPtr(Win32Native.HWND_BROADCAST), Win32Native.WM_SETTINGCHANGE, IntPtr.Zero, "Environment", 0, 1000, IntPtr.Zero); | ||
| if (r == IntPtr.Zero) Debug.Assert(false, "SetEnvironmentVariable failed: " + Marshal.GetLastWin32Error()); | ||
|
|
||
| #else // FEATURE_WIN32_REGISTRY | ||
| throw new ArgumentException(Environment.GetResourceString("Arg_EnumIllegalVal", (int)target)); | ||
| #endif | ||
| } | ||
| } | ||
| } |
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