storage/filesystem: implement missing functionality. (#110)

* storage/filesystem: added ObjectStorage Set.
* storage/filesystem: now passes all tests, except those specific to transactions.
* formats/config: Encoder now encodes subsections with no options.
* formats/config: add HasSubsection on Section.
* dotgit: add Ref method to get specific reference.

2 files changed, 46 insertions, 0 deletions

diff --git a/storage/filesystem/internal/dotgit/dotgit.go b/storage/filesystem/internal/dotgit/dotgit.go
index ba293af..6606153 100644
--- a/storage/filesystem/internal/dotgit/dotgit.go
+++ b/storage/filesystem/internal/dotgit/dotgit.go
@@ -215,6 +215,27 @@ func (d *DotGit) Refs() ([]*core.Reference, error) {
 	return refs, nil
 }
 
+// Ref returns the reference for a given reference name.
+func (d *DotGit) Ref(name core.ReferenceName) (*core.Reference, error) {
+	ref, err := d.readReferenceFile(".", name.String())
+	if err == nil {
+		return ref, nil
+	}
+
+	refs, err := d.Refs()
+	if err != nil {
+		return nil, err
+	}
+
+	for _, ref := range refs {
+		if ref.Name() == name {
+			return ref, nil
+		}
+	}
+
+	return nil, core.ErrReferenceNotFound
+}
+
 func (d *DotGit) addRefsFromPackedRefs(refs *[]*core.Reference) (err error) {
 	f, err := d.fs.Open(packedRefsPath)
 	if err != nil {
diff --git a/storage/filesystem/internal/dotgit/dotgit_test.go b/storage/filesystem/internal/dotgit/dotgit_test.go
index 9e46639..a4cce09 100644
--- a/storage/filesystem/internal/dotgit/dotgit_test.go
+++ b/storage/filesystem/internal/dotgit/dotgit_test.go
@@ -44,6 +44,12 @@ func (s *SuiteDotGit) TestSetRefs(c *C) {
 
 	c.Assert(err, IsNil)
 
+	err = dir.SetRef(core.NewReferenceFromStrings(
+		"bar",
+		"e8d3ffab552895c19b9fcf7aa264d277cde33881",
+	))
+	c.Assert(err, IsNil)
+
 	refs, err := dir.Refs()
 	c.Assert(err, IsNil)
 	c.Assert(refs, HasLen, 2)
@@ -55,6 +61,25 @@ func (s *SuiteDotGit) TestSetRefs(c *C) {
 	ref = findReference(refs, "refs/heads/symbolic")
 	c.Assert(ref, NotNil)
 	c.Assert(ref.Target().String(), Equals, "refs/heads/foo")
+
+	ref = findReference(refs, "bar")
+	c.Assert(ref, IsNil)
+
+	ref, err = dir.Ref("refs/heads/foo")
+	c.Assert(err, IsNil)
+	c.Assert(ref, NotNil)
+	c.Assert(ref.Hash().String(), Equals, "e8d3ffab552895c19b9fcf7aa264d277cde33881")
+
+	ref, err = dir.Ref("refs/heads/symbolic")
+	c.Assert(err, IsNil)
+	c.Assert(ref, NotNil)
+	c.Assert(ref.Target().String(), Equals, "refs/heads/foo")
+
+	ref, err = dir.Ref("bar")
+	c.Assert(err, IsNil)
+	c.Assert(ref, NotNil)
+	c.Assert(ref.Hash().String(), Equals, "e8d3ffab552895c19b9fcf7aa264d277cde33881")
+
 }
 
 func (s *SuiteDotGit) TestRefsFromPackedRefs(c *C) {