Ignore missing references on log --all

To mimic the actual standard git behavior, we must ignore references that are pointing to wrong/unexistent objects.

Signed-off-by: Antonio Jesus Navarro Perez <antnavper@gmail.com>

Author: ajnavarro

plumbing/object/commit_walker.go

@@ -197,26 +197,38 @@ func NewCommitAllIter(repoStorer storage.Storer, commitIterFunc func(*Commit) Co
 	commitsPath := list.New()
 	commitsLookup := make(map[plumbing.Hash]*list.Element)
 	head, err := storer.ResolveReference(repoStorer, plumbing.HEAD)
-	if err != nil {
+	if err != nil && err != plumbing.ErrReferenceNotFound {
 		return nil, err
+	} else if err != plumbing.ErrReferenceNotFound {
+		if err = addReference(repoStorer, commitIterFunc, head, commitsPath, commitsLookup); err != nil {
+			return nil, err
+		}
 	}
 
 	// add all references along with the HEAD
-	if err = addReference(repoStorer, commitIterFunc, head, commitsPath, commitsLookup); err != nil {
-		return nil, err
-	}
 	refIter, err := repoStorer.IterReferences()
 	if err != nil {
 		return nil, err
 	}
 	defer refIter.Close()
-	err = refIter.ForEach(
-		func(ref *plumbing.Reference) error {
-			return addReference(repoStorer, commitIterFunc, ref, commitsPath, commitsLookup)
-		},
-	)
-	if err != nil {
-		return nil, err
+
+	for {
+		ref, err := refIter.Next()
+		if err == io.EOF {
+			break
+		}
+
+		if err == plumbing.ErrReferenceNotFound {
+			continue
+		}
+
+		if err != nil {
+			return nil, err
+		}
+
+		if err = addReference(repoStorer, commitIterFunc, ref, commitsPath, commitsLookup); err != nil {
+			return nil, err
+		}
 	}
 
 	return &commitAllIterator{commitsPath.Front()}, nil

repository_test.go

@@ -1256,8 +1256,18 @@ func (s *RepositorySuite) TestLogAll(c *C) {
 	err := r.clone(context.Background(), &CloneOptions{
 		URL: s.GetBasicLocalRepositoryURL(),
 	})
+	c.Assert(err, IsNil)
+
+	rIter, err := r.Storer.IterReferences()
+	c.Assert(err, IsNil)
 
+	refCount := 0
+	err = rIter.ForEach(func(ref *plumbing.Reference) error {
+		refCount++
+		return nil
+	})
 	c.Assert(err, IsNil)
+	c.Assert(refCount, Equals, 5)
 
 	cIter, err := r.Log(&LogOptions{
 		All: true,
@@ -1286,6 +1296,58 @@ func (s *RepositorySuite) TestLogAll(c *C) {
 	cIter.Close()
 }
 
+func (s *RepositorySuite) TestLogAllMissingReferences(c *C) {
+	r, _ := Init(memory.NewStorage(), nil)
+	err := r.clone(context.Background(), &CloneOptions{
+		URL: s.GetBasicLocalRepositoryURL(),
+	})
+	c.Assert(err, IsNil)
+	err = r.Storer.RemoveReference(plumbing.HEAD)
+	c.Assert(err, IsNil)
+
+	rIter, err := r.Storer.IterReferences()
+	c.Assert(err, IsNil)
+
+	refCount := 0
+	err = rIter.ForEach(func(ref *plumbing.Reference) error {
+		refCount++
+		return nil
+	})
+	c.Assert(err, IsNil)
+	c.Assert(refCount, Equals, 4)
+
+	err = r.Storer.SetReference(plumbing.NewHashReference(plumbing.ReferenceName("DUMMY"), plumbing.NewHash("DUMMY")))
+	c.Assert(err, IsNil)
+
+	rIter, err = r.Storer.IterReferences()
+	c.Assert(err, IsNil)
+
+	refCount = 0
+	err = rIter.ForEach(func(ref *plumbing.Reference) error {
+		refCount++
+		return nil
+	})
+	c.Assert(err, IsNil)
+	c.Assert(refCount, Equals, 5)
+
+	cIter, err := r.Log(&LogOptions{
+		All: true,
+	})
+	c.Assert(cIter, NotNil)
+	c.Assert(err, IsNil)
+
+	cCount := 0
+	cIter.ForEach(func(c *object.Commit) error {
+		cCount++
+		return nil
+	})
+	c.Assert(cCount, Equals, 9)
+
+	_, err = cIter.Next()
+	c.Assert(err, Equals, io.EOF)
+	cIter.Close()
+}
+
 func (s *RepositorySuite) TestLogAllOrderByTime(c *C) {
 	r, _ := Init(memory.NewStorage(), nil)
 	err := r.clone(context.Background(), &CloneOptions{