repository: allow push from shallow repositories

Author: mcuadros

plumbing/object/commit_walker_test.go

@@ -1,7 +1,10 @@
 package object
 
-import . "gopkg.in/check.v1"
-import "gopkg.in/src-d/go-git.v4/plumbing"
+import (
+	"gopkg.in/src-d/go-git.v4/plumbing"
+
+	. "gopkg.in/check.v1"
+)
 
 type CommitWalkerSuite struct {
 	BaseObjectsSuite
@@ -57,27 +60,6 @@ func (s *CommitWalkerSuite) TestCommitPreIteratorWithIgnore(c *C) {
 	}
 }
 
-func (s *CommitWalkerSuite) TestCommitPreIteratorWithIgnoreFirst(c *C) {
-	commit := s.commit(c, s.Fixture.Head)
-
-	var commits []*Commit
-	NewCommitPreorderIter(commit, []plumbing.Hash{
-		plumbing.NewHash("6ecf0ef2c2dffb796033e5a02219af86ec6584e5"),
-	}).ForEach(func(c *Commit) error {
-		commits = append(commits, c)
-		return nil
-	})
-
-	c.Assert(commits, HasLen, 2)
-
-	expected := []string{
-		"6ecf0ef2c2dffb796033e5a02219af86ec6584e5",
-	}
-	for i, commit := range commits {
-		c.Assert(commit.Hash.String(), Equals, expected[i])
-	}
-}
-
 func (s *CommitWalkerSuite) TestCommitPostIterator(c *C) {
 	commit := s.commit(c, s.Fixture.Head)
 

plumbing/revlist/revlist.go

@@ -16,11 +16,7 @@ import (
 // the reachable objects from the given objects. Ignore param are object hashes
 // that we want to ignore on the result. All that objects must be accessible
 // from the object storer.
-func Objects(
-	s storer.EncodedObjectStorer,
-	objects []plumbing.Hash,
-	ignore []plumbing.Hash) ([]plumbing.Hash, error) {
-
+func Objects(s storer.EncodedObjectStorer, objects, ignore []plumbing.Hash) ([]plumbing.Hash, error) {
 	seen := hashListToSet(ignore)
 	result := make(map[plumbing.Hash]bool)
 
@@ -32,7 +28,7 @@ func Objects(
 	}
 
 	for _, h := range objects {
-		if err := processObject(s, h, seen, walkerFunc); err != nil {
+		if err := processObject(s, h, seen, ignore, walkerFunc); err != nil {
 			return nil, err
 		}
 	}
@@ -45,6 +41,7 @@ func processObject(
 	s storer.EncodedObjectStorer,
 	h plumbing.Hash,
 	seen map[plumbing.Hash]bool,
+	ignore []plumbing.Hash,
 	walkerFunc func(h plumbing.Hash),
 ) error {
 	o, err := s.EncodedObject(plumbing.AnyObject, h)
@@ -59,12 +56,12 @@ func processObject(
 
 	switch do := do.(type) {
 	case *object.Commit:
-		return reachableObjects(do, seen, walkerFunc)
+		return reachableObjects(do, seen, ignore, walkerFunc)
 	case *object.Tree:
 		return iterateCommitTrees(seen, do, walkerFunc)
 	case *object.Tag:
 		walkerFunc(do.Hash)
-		return processObject(s, do.Target, seen, walkerFunc)
+		return processObject(s, do.Target, seen, ignore, walkerFunc)
 	case *object.Blob:
 		walkerFunc(do.Hash)
 	default:
@@ -82,22 +79,24 @@ func processObject(
 func reachableObjects(
 	commit *object.Commit,
 	seen map[plumbing.Hash]bool,
+	ignore []plumbing.Hash,
 	cb func(h plumbing.Hash)) error {
-	return object.NewCommitPreorderIter(commit).
-		ForEach(func(commit *object.Commit) error {
-			if seen[commit.Hash] {
-				return nil
-			}
 
-			cb(commit.Hash)
+	i := object.NewCommitPreorderIter(commit, ignore)
+	return i.ForEach(func(commit *object.Commit) error {
+		if seen[commit.Hash] {
+			return nil
+		}
+
+		cb(commit.Hash)
 
-			tree, err := commit.Tree()
-			if err != nil {
-				return err
-			}
+		tree, err := commit.Tree()
+		if err != nil {
+			return err
+		}
 
-			return iterateCommitTrees(seen, tree, cb)
-		})
+		return iterateCommitTrees(seen, tree, cb)
+	})
 }
 
 // iterateCommitTrees iterate all reachable trees from the given commit

remote.go

@@ -104,6 +104,7 @@ func (r *Remote) Push(o *PushOptions) (err error) {
 
 	req := packp.NewReferenceUpdateRequestFromCapabilities(ar.Capabilities)
 	if err := r.addReferencesToUpdate(o.RefSpecs, remoteRefs, req); err != nil {
+
 		return err
 	}
 
@@ -121,6 +122,15 @@ func (r *Remote) Push(o *PushOptions) (err error) {
 		return err
 	}
 
+	stop, err := r.s.Shallow()
+	if err != nil {
+		return err
+	}
+
+	// if we have shallow we should include this as part of the objects that
+	// we are aware.
+	haves = append(haves, stop...)
+
 	hashesToPush, err := revlist.Objects(r.s, objects, haves)
 	if err != nil {
 		return err
@@ -486,7 +496,7 @@ func isFastForward(s storer.EncodedObjectStorer, old, new plumbing.Hash) (bool,
 	}
 
 	found := false
-	iter := object.NewCommitPreorderIter(c)
+	iter := object.NewCommitPreorderIter(c, nil)
 	return found, iter.ForEach(func(c *object.Commit) error {
 		if c.Hash != old {
 			return nil

repository.go

@@ -689,7 +689,7 @@ func (r *Repository) Log(o *LogOptions) (object.CommitIter, error) {
 		return nil, err
 	}
 
-	return object.NewCommitPreorderIter(commit), nil
+	return object.NewCommitPreorderIter(commit, nil), nil
 }
 
 // Tags returns all the References from Tags. This method returns all the tag
@@ -918,7 +918,7 @@ func (r *Repository) ResolveRevision(rev plumbing.Revision) (*plumbing.Hash, err
 				commit = c
 			}
 		case revision.CaretReg:
-			history := object.NewCommitPreorderIter(commit)
+			history := object.NewCommitPreorderIter(commit, nil)
 
 			re := item.(revision.CaretReg).Regexp
 			negate := item.(revision.CaretReg).Negate
@@ -948,7 +948,7 @@ func (r *Repository) ResolveRevision(rev plumbing.Revision) (*plumbing.Hash, err
 
 			commit = c
 		case revision.AtDate:
-			history := object.NewCommitPreorderIter(commit)
+			history := object.NewCommitPreorderIter(commit, nil)
 
 			date := item.(revision.AtDate).Date
 

repository_test.go

@@ -20,6 +20,7 @@ import (
 	. "gopkg.in/check.v1"
 	"gopkg.in/src-d/go-billy.v3/memfs"
 	"gopkg.in/src-d/go-billy.v3/osfs"
+	"gopkg.in/src-d/go-billy.v3/util"
 )
 
 type RepositorySuite struct {
@@ -767,6 +768,50 @@ func (s *RepositorySuite) TestPushToEmptyRepository(c *C) {
 	c.Assert(err, IsNil)
 }
 
+func (s *RepositorySuite) TestPushDepth(c *C) {
+	dir, err := ioutil.TempDir("", "push-depth")
+	defer os.RemoveAll(dir)
+
+	origin, err := PlainClone(c.MkDir(), true, &CloneOptions{
+		URL: fixtures.Basic().One().DotGit().Root(),
+	})
+
+	c.Assert(err, IsNil)
+	fs := origin.Storer.(*filesystem.Storage).Filesystem()
+
+	r, err := Clone(memory.NewStorage(), memfs.New(), &CloneOptions{
+		URL:   fs.Root(),
+		Depth: 1,
+	})
+	c.Assert(err, IsNil)
+
+	err = util.WriteFile(r.wt, "foo", nil, 0755)
+	c.Assert(err, IsNil)
+
+	w, err := r.Worktree()
+	c.Assert(err, IsNil)
+
+	_, err = w.Add("foo")
+	c.Assert(err, IsNil)
+
+	hash, err := w.Commit("foo", &CommitOptions{
+		Author:    defaultSignature(),
+		Committer: defaultSignature(),
+	})
+	c.Assert(err, IsNil)
+
+	err = r.Push(&PushOptions{})
+	c.Assert(err, IsNil)
+
+	remote, err := origin.Head()
+	c.Assert(err, IsNil)
+	c.Assert(remote.Hash(), Equals, hash)
+
+	local, err := r.Head()
+	c.Assert(err, IsNil)
+	c.Assert(local.Hash(), Equals, remote.Hash())
+}
+
 func (s *RepositorySuite) TestPushNonExistentRemote(c *C) {
 	srcFs := fixtures.Basic().One().DotGit()
 	sto, err := filesystem.NewStorage(srcFs)