Expose libgit2 fetch functionality.

LibGit2Sharp.Tests/BranchFixture.cs

@@ -220,6 +220,19 @@ public void CanListAllBranchesIncludingRemoteRefs()
             }
         }
 
+        [Fact]
+        public void CanResolveTrackedRemote()
+        {
+            using (var repo = new Repository(StandardTestRepoPath))
+            {
+                Branch master = repo.Branches["master"];
+                Assert.Equal(repo.Remotes["origin"], master.ResolveTrackedRemote());
+
+                Branch test = repo.Branches["test"];
+                Assert.Null(test);
+            }
+        }
+
         [Fact]
         public void CanLookupABranchByItsCanonicalName()
         {

LibGit2Sharp/Branch.cs

@@ -136,9 +136,31 @@ public virtual ICommitLog Commits
             get { return repo.Commits.QueryBy(new Filter { Since = this }); }
         }
 
+        /// <summary>
+        ///   Gets the <see cref="Remote"/> tracking this branch
+        /// </summary>
+        /// <returns>The <see cref="Remote"/> tracking this branch if one exists, otherwise returns null.</returns>
+        public virtual Remote ResolveTrackedRemote()
+        {
+            if (IsTracking)
+            {
+                string trackedRemoteName = ResolveTrackedRemoteName();
+                if (string.IsNullOrEmpty(trackedRemoteName))
+                {
+                    return null;
+                }
+
+                return repo.Remotes[trackedRemoteName];
+            }
+            else
+            {
+                return null;
+            }
+        }
+
         private Branch ResolveTrackedBranch()
         {
-            var trackedRemote = repo.Config.Get<string>("branch", Name, "remote", null);
+            string trackedRemote = ResolveTrackedRemoteName();
             if (trackedRemote == null)
             {
                 return null;
@@ -154,6 +176,11 @@ private Branch ResolveTrackedBranch()
             return repo.Branches[remoteRefName];
         }
 
+        private string ResolveTrackedRemoteName()
+        {
+            return repo.Config.Get<string>("branch", Name, "remote", null) as string;
+        }
+
         private static string ResolveTrackedReference(string trackedRemote, string trackedRefName)
         {
             if (trackedRemote == ".")

LibGit2Sharp/Core/GitDirection.cs

@@ -0,0 +1,10 @@
+using System;
+
+namespace LibGit2Sharp.Core
+{
+    internal enum GitDirection
+    {
+        Fetch = 0,
+        Push = 1
+    }
+}

LibGit2Sharp/Core/GitIndexerStats.cs

@@ -0,0 +1,12 @@
+using System;
+using System.Runtime.InteropServices;
+
+namespace LibGit2Sharp.Core
+{
+    [StructLayout(LayoutKind.Sequential)]
+    internal struct GitIndexerStats
+    {
+        public uint total;
+        public uint processed;
+    }
+}

LibGit2Sharp/Core/NativeMethods.cs

@@ -567,6 +567,18 @@ public static extern int git_remote_new(
         [return : MarshalAs(UnmanagedType.CustomMarshaler, MarshalTypeRef = typeof(Utf8Marshaler))]
         public static extern string git_remote_url(RemoteSafeHandle remote);
 
+        [DllImport(libgit2)]
+        public static extern int git_remote_connect(RemoteSafeHandle remote, GitDirection direction);
+
+        [DllImport(libgit2)]
+        public static extern void git_remote_disconnect(RemoteSafeHandle remote);
+
+        [DllImport(libgit2)]
+        public static extern int git_remote_download(RemoteSafeHandle remote, ref long bytes, ref GitIndexerStats stats);
+
+        [DllImport(libgit2)]
+        public static extern int git_remote_update_tips(RemoteSafeHandle remote, IntPtr cb);
+
         [DllImport(libgit2)]
         public static extern int git_remote_save(RemoteSafeHandle remote);
 

LibGit2Sharp/FetchProgress.cs

@@ -0,0 +1,43 @@
+using LibGit2Sharp.Core;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace LibGit2Sharp
+{
+    /// <summary>
+    ///   Contains data regarding fetch progress.
+    /// </summary>
+    public class FetchProgress : IndexerStats
+    {
+        /// <summary>
+        ///   Fetch progress constructor.
+        /// </summary>
+        public FetchProgress()
+        { }
+
+        /// <summary>
+        ///   Bytes received.
+        /// </summary>
+        public long Bytes
+        {
+            get
+            {
+                return bytes;
+            }
+        }
+
+        internal override void Reset()
+        {
+            base.Reset();
+            bytes = 0;
+        }
+
+        #region Fields
+
+        internal long bytes;
+
+        #endregion
+    }
+}

LibGit2Sharp/IndexerStats.cs

@@ -0,0 +1,57 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace LibGit2Sharp.Core
+{
+    /// <summary>
+    /// Wrapper around git_indexer_stats
+    /// </summary>
+    public class IndexerStats
+    {
+        /// <summary>
+        ///   Constructor
+        /// </summary>
+        public IndexerStats()
+        {
+            indexerStats = new GitIndexerStats();
+        }
+        /// <summary>
+        ///   Total number of objects
+        /// </summary>
+        public long TotalObjectCount
+        {
+            get
+            {
+                return indexerStats.total;
+            }
+        }
+
+        /// <summary>
+        ///   Number of objects processed.
+        /// </summary>
+        public long ProcessedObjectCount
+        {
+            get
+            {
+                return indexerStats.processed;
+            }
+        }
+
+        /// <summary>
+        ///   Reset internal data
+        /// </summary>
+        internal virtual void Reset()
+        {
+            indexerStats.processed = 0;
+            indexerStats.total = 0;
+        }
+
+        #region Fields
+
+        internal GitIndexerStats indexerStats;
+
+        #endregion
+    }
+}

LibGit2Sharp/LibGit2Sharp.csproj

@@ -66,8 +66,10 @@
     <Compile Include="CommitLog.cs" />
     <Compile Include="Configuration.cs" />
     <Compile Include="ContentChanges.cs" />
+    <Compile Include="Core\GitIndexerStats.cs" />
     <Compile Include="TagCollectionExtensions.cs" />
     <Compile Include="Core\Compat\Environment.cs" />
+    <Compile Include="FetchProgress.cs" />
     <Compile Include="Core\FilePath.cs" />
     <Compile Include="Core\FilePathExtensions.cs" />
     <Compile Include="Core\FilePathMarshaler.cs" />
@@ -79,6 +81,7 @@
     <Compile Include="Core\GitBranchType.cs" />
     <Compile Include="Core\GitDiff.cs" />
     <Compile Include="Core\GitDiffExtensions.cs" />
+    <Compile Include="Core\GitDirection.cs" />
     <Compile Include="Core\GitError.cs" />
     <Compile Include="Core\GitErrorCategory.cs" />
     <Compile Include="Core\GitNoteData.cs" />
@@ -93,6 +96,7 @@
     <Compile Include="Core\Handles\OidSafeHandle.cs" />
     <Compile Include="Core\Handles\TreeBuilderSafeHandle.cs" />
     <Compile Include="Core\Handles\TreeEntrySafeHandle_Owned.cs" />
+    <Compile Include="IndexerStats.cs" />
     <Compile Include="Core\ReferenceExtensions.cs" />
     <Compile Include="Core\Handles\ReferenceSafeHandle.cs" />
     <Compile Include="Core\Handles\SignatureSafeHandle.cs" />

LibGit2Sharp/Remote.cs

@@ -12,13 +12,16 @@ public class Remote : IEquatable<Remote>
         private static readonly LambdaEqualityHelper<Remote> equalityHelper =
             new LambdaEqualityHelper<Remote>(new Func<Remote, object>[] { x => x.Name, x => x.Url });
 
+        private Repository repository;
+
         /// <summary>
         ///   Needed for mocking purposes.
         /// </summary>
         protected Remote()
         { }
 
-        internal static Remote CreateFromPtr(RemoteSafeHandle handle)
+
+        internal static Remote CreateFromPtr(Repository repository, RemoteSafeHandle handle)
         {
             if (handle == null)
             {
@@ -32,6 +35,7 @@ internal static Remote CreateFromPtr(RemoteSafeHandle handle)
                              {
                                  Name = name,
                                  Url = url,
+                                 repository = repository,
                              };
 
             return remote;
@@ -47,6 +51,39 @@ internal static Remote CreateFromPtr(RemoteSafeHandle handle)
         /// </summary>
         public virtual string Url { get; private set; }
 
+        /// <summary>
+        ///   Fetch updates from the remote.
+        /// </summary>
+        /// <param name="fetchProgress">The <see cref = "FetchProgress" /> to report current fetch progress.</param>
+        public virtual void Fetch(FetchProgress fetchProgress)
+        {
+            // reset the current progress object
+            fetchProgress.Reset();
+
+            using (RemoteSafeHandle remoteHandle = repository.Remotes.LoadRemote(Name, true))
+            {
+                try
+                {
+                    int res = NativeMethods.git_remote_connect(remoteHandle, GitDirection.Fetch);
+                    Ensure.Success(res);
+
+                    int downloadResult = NativeMethods.git_remote_download(remoteHandle, ref fetchProgress.bytes, ref fetchProgress.indexerStats);
+                    Ensure.Success(downloadResult);
+                }
+                finally
+                {
+                    if (remoteHandle != null)
+                    {
+                        NativeMethods.git_remote_disconnect(remoteHandle);
+                    }
+                }
+
+                // update references
+                int updateTipsResult = NativeMethods.git_remote_update_tips(remoteHandle, IntPtr.Zero);
+                Ensure.Success(updateTipsResult);
+            }
+        }
+
         /// <summary>
         ///   Determines whether the specified <see cref = "Object" /> is equal to the current <see cref = "Remote" />.
         /// </summary>

LibGit2Sharp/RemoteCollection.cs

@@ -55,7 +55,7 @@ private Remote RemoteForName(string name)
         {
             using (RemoteSafeHandle handle = LoadRemote(name, false))
             {
-                return Remote.CreateFromPtr(handle);
+                return Remote.CreateFromPtr(repository, handle);
             }
         }
 
@@ -100,7 +100,7 @@ public virtual Remote Add(string name, string url)
 
             using (handle)
             {
-                return Remote.CreateFromPtr(handle);
+                return Remote.CreateFromPtr(repository, handle);
             }
         }
 
@@ -142,7 +142,7 @@ public virtual Remote Add(string name, string url, string fetchRefSpec)
                 res = NativeMethods.git_remote_save(handle);
                 Ensure.Success(res);
 
-                return Remote.CreateFromPtr(handle);
+                return Remote.CreateFromPtr(repository, handle);
             }
         }