Set / get supported extensions

- C# wrapper for libgit2/libgit2#6031

(I'm not sure at all for the P/Invoke code)

Author: jairbubbles

LibGit2Sharp.Tests/GlobalSettingsFixture.cs

@@ -80,5 +80,24 @@ public void LoadFromSpecifiedPath(string architecture)
                 DirectoryHelper.DeleteDirectory(tempDir);
             }
         }
+
+        [Fact]
+        public void SetExtensions()
+        {
+            var extensions = GlobalSettings.GetExtensions();
+
+            // Assert that "noop" is supported by default
+            Assert.Equal(new[] { "noop" }, extensions);
+
+            // Disable "noop" extensions
+            GlobalSettings.SetExtensions(new[] { "!noop" });
+            extensions = GlobalSettings.GetExtensions();
+            Assert.Empty(extensions);
+
+            // Enable two new extensions (it will reset the configuration and "noop" will be enabled)
+            GlobalSettings.SetExtensions(new[] { "partialclone", "newext" });
+            extensions = GlobalSettings.GetExtensions();
+            Assert.Equal(new[] { "noop", "partialclone", "newext" }, extensions);
+        }
     }
 }

LibGit2Sharp/Core/NativeMethods.cs

@@ -812,6 +812,14 @@ internal static extern int git_libgit2_opts(int option,
         // git_libgit2_opts(GIT_OPT_GET_USER_AGENT, git_buf *buf)
         [DllImport(libgit2, CallingConvention = CallingConvention.Cdecl)]
         internal static extern int git_libgit2_opts(int option, GitBuf buf);
+
+        // git_libgit2_opts(GIT_OPT_SET_EXTENSIONS, const char **extensions, size_t len)
+        [DllImport(libgit2, CallingConvention = CallingConvention.Cdecl)]
+        internal static extern int git_libgit2_opts(int option, string[] extensions, int len);
+
+        // git_libgit2_opts(GIT_OPT_GET_EXTENSIONS, git_strarray *out)
+        [DllImport(libgit2, CallingConvention = CallingConvention.Cdecl)]
+        internal static extern int git_libgit2_opts(int option, out GitStrArray extensions);
         #endregion
 
         [DllImport(libgit2, CallingConvention = CallingConvention.Cdecl)]

LibGit2Sharp/Core/Proxy.cs

@@ -3381,6 +3381,18 @@ private enum LibGit2Option
             GetWindowsSharemode,             // GIT_OPT_GET_WINDOWS_SHAREMODE
             SetWindowsSharemode,             // GIT_OPT_SET_WINDOWS_SHAREMODE
             EnableStrictHashVerification,    // GIT_OPT_ENABLE_STRICT_HASH_VERIFICATION
+            SetAllocator,                    // GIT_OPT_SET_ALLOCATOR,
+            EnableUnsavedIndexSafety,        // GIT_OPT_ENABLE_UNSAVED_INDEX_SAFETY,
+            GetPackMaxObject,                // GIT_OPT_GET_PACK_MAX_OBJECTS,
+            SetPackMaxObjects,               // GIT_OPT_SET_PACK_MAX_OBJECTS,
+            DisabledPackKeepFileChecks,      // GIT_OPT_DISABLE_PACK_KEEP_FILE_CHECKS,
+            EnableHttpExpectContinue,        // GIT_OPT_ENABLE_HTTP_EXPECT_CONTINUE,
+            GetMWindowFileLimit,             // GIT_OPT_GET_MWINDOW_FILE_LIMIT,
+            SetMWindowFileLimit,             // GIT_OPT_SET_MWINDOW_FILE_LIMIT,
+            SetOdbPackedPriority,            // GIT_OPT_SET_ODB_PACKED_PRIORITY,
+            SetOdbLoosePriority,             // GIT_OPT_SET_ODB_LOOSE_PRIORITY,
+            GetExtensions,                   // GIT_OPT_GET_EXTENSIONS,
+            SetExtensions,                   // GIT_OPT_SET_EXTENSIONS
         }
 
         /// <summary>
@@ -3489,6 +3501,29 @@ public static string git_libgit2_opts_get_user_agent()
             return userAgent;
         }
 
+        public static void git_libgit2_opts_set_extensions(string[] extensions)
+        {
+            var res = NativeMethods.git_libgit2_opts((int)LibGit2Option.SetExtensions, extensions, extensions.Length);
+            Ensure.ZeroResult(res);
+        }
+
+        public static string[] git_libgit2_opts_get_extensions()
+        {
+            var array = new GitStrArrayNative();
+
+            try
+            {
+                var res = NativeMethods.git_libgit2_opts((int)LibGit2Option.GetExtensions, out array.Array);
+                Ensure.ZeroResult(res);
+
+                return array.ReadStrings();
+            }
+            finally
+            {
+                array.Dispose();
+            }
+        }
+
         #endregion
 
         #region git_worktree_

LibGit2Sharp/GlobalSettings.cs

@@ -525,6 +525,30 @@ public static void SetUserAgent(string userAgent)
             Proxy.git_libgit2_opts_set_user_agent(userAgent);
         }
 
+        /// <summary>
+        /// Set that the given git extensions are supported by the caller.
+        /// </summary>
+        /// <remarks>
+        /// Extensions supported by libgit2 may be negated by prefixing them with a `!`.  For example: setting extensions to { "!noop", "newext" } indicates that the caller does not want
+        /// to support repositories with the `noop` extension but does want to support repositories with the `newext` extension.
+        /// </remarks>
+        /// <param name="extensions">Supported extensions</param>
+        public static void SetExtensions(params string[] extensions)
+        {
+            Proxy.git_libgit2_opts_set_extensions(extensions);
+        }
+
+        /// <summary>
+        /// Returns the list of git extensions that are supported.
+        /// </summary>
+        /// <remarks>
+        /// This is the list of built-in extensions supported by libgit2 and custom extensions that have been added with `SetExtensions`. Extensions that have been negated will not be returned.
+        /// </remarks>
+        public static string[] GetExtensions()
+        {
+            return Proxy.git_libgit2_opts_get_extensions();
+        }
+
         /// <summary>
         /// Gets the user-agent string used by libgit2.
         /// <returns>

LibGit2Sharp/LibGit2Sharp.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <TargetFrameworks>netstandard2.0;netcoreapp2.1</TargetFrameworks>
@@ -32,7 +32,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="LibGit2Sharp.NativeBinaries" Version="[2.0.315-alpha.0.2]" PrivateAssets="none" />
+    <PackageReference Include="LibGit2Sharp.NativeBinaries" Version="[2.0.315-alpha.0.4]" PrivateAssets="none" />
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0" PrivateAssets="all" />
     <PackageReference Include="Nerdbank.GitVersioning" Version="3.4.220" PrivateAssets="all" />
   </ItemGroup>