Silently ignore rewriting of commits under refs/notes/*

Fix #942

2 files changed, 27 insertions, 2 deletions

diff --git a/LibGit2Sharp.Tests/FilterBranchFixture.cs b/LibGit2Sharp.Tests/FilterBranchFixture.cs
index dfe14329..aed628a1 100644
--- a/LibGit2Sharp.Tests/FilterBranchFixture.cs
+++ b/LibGit2Sharp.Tests/FilterBranchFixture.cs
@@ -162,7 +162,8 @@ namespace LibGit2Sharp.Tests
 
             AssertSucceedingButNotError();
 
-            var nonBackedUpRefs = repo.Refs.Where(x => !x.CanonicalName.StartsWith("refs/original"));
+            var nonBackedUpRefs = repo.Refs.Where(
+                x => !x.CanonicalName.StartsWith("refs/original/") && !x.CanonicalName.StartsWith("refs/notes/"));
             Assert.Empty(repo.Commits.QueryBy(new CommitFilter { Since = nonBackedUpRefs })
                              .Where(c => c.Author.Name != "Ben Straub"));
         }
@@ -801,6 +802,26 @@ namespace LibGit2Sharp.Tests
             Assert.Equal(annotationB, backedUpTag.ResolveToDirectReference().Target);
         }
 
+        [Fact]
+        public void RewritingNotesHasNoEffect()
+        {
+            var notesRefsRetriever = new Func<IEnumerable<Reference>>(() => repo.Refs.Where(r => r.CanonicalName.StartsWith("refs/notes/")));
+            var originalNotesRefs = notesRefsRetriever().ToList();
+            var commits = repo.Commits.QueryBy(new CommitFilter { Since = originalNotesRefs }).ToArray();
+
+            repo.Refs.RewriteHistory(new RewriteHistoryOptions
+            {
+                OnError = OnError,
+                OnSucceeding = OnSucceeding,
+                CommitHeaderRewriter =
+                    c => CommitRewriteInfo.From(c, author: Constants.Signature),
+            }, commits);
+
+            AssertSucceedingButNotError();
+
+            Assert.Equal(originalNotesRefs.OrderBy(r => r.CanonicalName), notesRefsRetriever().OrderBy(r => r.CanonicalName));
+        }
+
         private static string TagNameRewriter(string name, bool isAnnotated, string target)
         {
             const string tagPrefix = "refs/tags/";
diff --git a/LibGit2Sharp/Core/HistoryRewriter.cs b/LibGit2Sharp/Core/HistoryRewriter.cs
index 15686ecc..d520b3c2 100644
--- a/LibGit2Sharp/Core/HistoryRewriter.cs
+++ b/LibGit2Sharp/Core/HistoryRewriter.cs
@@ -59,7 +59,11 @@ namespace LibGit2Sharp.Core
                 // before A.
                 foreach (var reference in refsToRewrite.OrderBy(ReferenceDepth))
                 {
-                    // TODO: Check how rewriting of notes actually behaves
+                    // TODO: Rewrite refs/notes/* properly
+                    if (reference.CanonicalName.StartsWith("refs/notes/"))
+                    {
+                        continue;
+                    }
 
                     RewriteReference(reference);
                 }