Delete RHEL6 leftovers (dotnet#1648)

Fixes dotnet#423
Closes dotnet/corefx#24525
Closes dotnet/corefx#37739
Closes dotnet/corefx#31792

src/coreclr/init-distro-rid.sh

@@ -26,7 +26,6 @@
 #
 #   |    OS     |           Expected RID            |
 #   -------------------------------------------------
-#   |   rhel6   |           rhel.6-x64              |
 #   |  alpine*  |        linux-musl-(arch)          |
 #   |  freeBSD  |        freebsd.(version)-x64      |
 #

src/installer/corehost/common/pal.unix.cpp

@@ -545,7 +545,6 @@ pal::string_t pal::get_current_os_rid_platform()
 {
     pal::string_t ridOS;
     pal::string_t versionFile(_X("/etc/os-release"));
-    pal::string_t rhelVersionFile(_X("/etc/redhat-release"));
 
     if (pal::file_exists(versionFile))
     {
@@ -625,35 +624,6 @@ pal::string_t pal::get_current_os_rid_platform()
             }
         }
     }
-    else if (pal::file_exists(rhelVersionFile))
-    {
-        // Read the file to check if the current OS is RHEL or CentOS 6.x
-        std::fstream fsVersionFile;
-
-        fsVersionFile.open(rhelVersionFile, std::fstream::in);
-
-        // Proceed only if we were able to open the file
-        if (fsVersionFile.good())
-        {
-            pal::string_t line;
-            // Read the first line
-            std::getline(fsVersionFile, line);
-
-            if (!fsVersionFile.eof())
-            {
-                pal::string_t rhel6Prefix(_X("Red Hat Enterprise Linux Server release 6."));
-                pal::string_t centos6Prefix(_X("CentOS release 6."));
-
-                if ((line.find(rhel6Prefix) == 0) || (line.find(centos6Prefix) == 0))
-                {
-                    ridOS = _X("rhel.6");
-                }
-            }
-
-            // Close the file now that we are done with it.
-            fsVersionFile.close();
-        }
-    }
 
     return normalize_linux_rid(ridOS);
 }

src/libraries/Common/tests/CoreFx.Private.TestUtilities/System/PlatformDetection.Unix.cs

@@ -48,8 +48,6 @@ public static partial class PlatformDetection
         // RedHat family covers RedHat and CentOS
         public static bool IsRedHatFamily => IsRedHatFamilyAndVersion();
         public static bool IsNotRedHatFamily => !IsRedHatFamily;
-        public static bool IsRedHatFamily6 => IsRedHatFamilyAndVersion(6);
-        public static bool IsNotRedHatFamily6 => !IsRedHatFamily6;
         public static bool IsRedHatFamily7 => IsRedHatFamilyAndVersion(7);
         public static bool IsNotFedoraOrRedHatFamily => !IsFedora && !IsRedHatFamily;
         public static bool IsNotDebian10 => !IsDebian10;

src/libraries/Common/tests/CoreFx.Private.TestUtilities/System/PlatformDetection.cs

@@ -50,8 +50,7 @@ public static bool IsDrawingSupported
                 }
                 else
                 {
-                   // ActiveIssue(24525) 
-                   return PlatformDetection.IsNotRedHatFamily6 && (NativeLibrary.TryLoad("libgdiplus.so", out _) || NativeLibrary.TryLoad("libgdiplus.so.0", out _));
+                   return NativeLibrary.TryLoad("libgdiplus.so", out _) || NativeLibrary.TryLoad("libgdiplus.so.0", out _);
                 }
 #endif
             }

src/libraries/System.Diagnostics.Process/tests/ProcessTests.Unix.cs

@@ -156,8 +156,7 @@ public void ProcessStart_UseShellExecute_OnUnix_SuccessWhenProgramInstalled(bool
             }
         }
 
-        // Active issue https://github.com/dotnet/corefx/issues/37739
-        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsNotRedHatFamily6))]
+        [Fact]
         [PlatformSpecific(~TestPlatforms.OSX)] // On OSX, ProcessName returns the script interpreter.
         public void ProcessNameMatchesScriptName()
         {

src/libraries/System.Drawing.Primitives/tests/ColorTranslatorTests.cs

@@ -219,7 +219,7 @@ public void FromHtml_Invalid_Throws(string htmlColor)
             }
         }
 
-        [ConditionalTheory(Helpers.IsDrawingSupported)]
+        [ConditionalTheory(typeof(PlatformDetection), nameof(PlatformDetection.IsDrawingSupported))]
         [InlineData("#G12", typeof(FormatException))]
         [InlineData("#G12345", typeof(FormatException))]
         [InlineData("1,2", typeof(ArgumentException))]

src/libraries/System.Drawing.Primitives/tests/System.Drawing.Primitives.Tests.csproj

@@ -5,7 +5,6 @@
   <ItemGroup>
     <Compile Include="ColorTranslatorTests.cs" />
     <Compile Include="DataContractSerializerTests.cs" />
-    <Compile Include="Helpers.cs" />
     <Compile Include="PointFTests.cs" />
     <Compile Include="PointTests.cs" />
     <Compile Include="RectangleFTests.cs" />

src/libraries/System.IO.FileSystem/tests/Directory/Delete.cs

@@ -11,7 +11,7 @@ namespace System.IO.Tests
 {
     public class Directory_Delete_str : FileSystemTest
     {
-        static bool IsBindMountSupported => RuntimeInformation.IsOSPlatform(OSPlatform.Linux) && !PlatformDetection.IsInContainer && !PlatformDetection.IsRedHatFamily6;
+        static bool IsBindMountSupported => RuntimeInformation.IsOSPlatform(OSPlatform.Linux) && !PlatformDetection.IsInContainer;
 
         #region Utilities
 

src/libraries/System.IO.FileSystem/tests/File/Delete.cs

@@ -10,7 +10,7 @@ namespace System.IO.Tests
 {
     public class File_Delete : FileSystemTest
     {
-        static bool IsBindMountSupported => RuntimeInformation.IsOSPlatform(OSPlatform.Linux) && !PlatformDetection.IsInContainer && !PlatformDetection.IsRedHatFamily6;
+        static bool IsBindMountSupported => RuntimeInformation.IsOSPlatform(OSPlatform.Linux) && !PlatformDetection.IsInContainer;
 
         protected virtual void Delete(string path)
         {

src/libraries/System.IO.Pipes/tests/AnonymousPipeTests/AnonymousPipeTest.Specific.cs

@@ -79,7 +79,7 @@ public static void ClonedClient_ActsAsOriginalClient()
             }
         }
 
-        [ConditionalFact(typeof(PlatformDetection), "IsNotRedHatFamily6")]
+        [Fact]
         [PlatformSpecific(TestPlatforms.Linux)]  // On Linux, setting the buffer size of the server will also set the buffer size of the client
         public static void Linux_BufferSizeRoundtrips()
         {

src/libraries/System.Runtime.Extensions/tests/System/Runtime/ProfileOptimization.cs

@@ -11,27 +11,13 @@ namespace System.Runtime.Tests
 {
     public class ProfileOptimizationTest : FileCleanupTestBase
     {
-        // Active issue https://github.com/dotnet/corefx/issues/31792
-        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsNotRedHatFamily6))]
+        [Fact]
         public void ProfileOptimization_CheckFileExists()
         {
             string profileFile = GetTestFileName();
 
             RemoteExecutor.Invoke((_profileFile) =>
             {
-                // tracking down why test sporadically fails on RedHat69
-                // write to the file first to check permissions
-                // See https://github.com/dotnet/corefx/issues/31792
-                File.WriteAllText(_profileFile, "42");
-
-                // Verify this write succeeded
-                Assert.True(File.Exists(_profileFile), $"'{_profileFile}' does not exist");
-                Assert.True(new FileInfo(_profileFile).Length > 0, $"'{_profileFile}' is empty");
-
-                // Delete the file and verify the delete
-                File.Delete(_profileFile);
-                Assert.True(!File.Exists(_profileFile), $"'{_profileFile} ought to not exist now");
-
                 // Perform the test work
                 ProfileOptimization.SetProfileRoot(Path.GetDirectoryName(_profileFile));
                 ProfileOptimization.StartProfile(Path.GetFileName(_profileFile));

src/libraries/System.Security.Cryptography.X509Certificates/tests/RevocationTests/DynamicRevocationTests.cs

@@ -22,11 +22,6 @@ public static class DynamicRevocationTests
         private static readonly X509ChainStatusFlags ThisOsRevocationStatusUnknown =
                 X509ChainStatusFlags.RevocationStatusUnknown | X509ChainStatusFlags.OfflineRevocation;
 
-        // RHEL6 uses a version of OpenSSL that (empirically) doesn't support designated responders.
-        // (There's a chance that we should be passing in extra stuff, but RHEL6 is the only platform
-        // still on OpenSSL 1.0.0/1.0.1 in 2019, so it seems OpenSSL-related)
-        private static readonly bool s_supportsDesignatedResponder = PlatformDetection.IsNotRedHatFamily6;
-
         [Flags]
         public enum PkiOptions
         {
@@ -57,9 +52,7 @@ public static IEnumerable<object[]> AllViableRevocation
         {
             get
             {
-                int designationLimit = s_supportsDesignatedResponder ? 4 : 1;
-
-                for (int designation = 0; designation < designationLimit; designation++)
+                for (int designation = 0; designation < 4; designation++)
                 {
                     PkiOptions designationOptions = (PkiOptions)(designation << 16);