Update dependencies (#5518)

vendor/gopkg.in/src-d/go-git.v4/remote.go

@@ -45,7 +45,10 @@ type Remote struct {
 	s storage.Storer
 }
 
-func newRemote(s storage.Storer, c *config.RemoteConfig) *Remote {
+// NewRemote creates a new Remote.
+// The intended purpose is to use the Remote for tasks such as listing remote references (like using git ls-remote).
+// Otherwise Remotes should be created via the use of a Repository.
+func NewRemote(s storage.Storer, c *config.RemoteConfig) *Remote {
 	return &Remote{s: s, c: c}
 }
 
@@ -168,7 +171,17 @@ func (r *Remote) PushContext(ctx context.Context, o *PushOptions) (err error) {
 		}
 	}
 
-	rs, err := pushHashes(ctx, s, r.s, req, hashesToPush, r.useRefDeltas(ar))
+	if len(hashesToPush) == 0 {
+		allDelete = true
+		for _, command := range req.Commands {
+			if command.Action() != packp.Delete {
+				allDelete = false
+				break
+			}
+		}
+	}
+
+	rs, err := pushHashes(ctx, s, r.s, req, hashesToPush, r.useRefDeltas(ar), allDelete)
 	if err != nil {
 		return err
 	}
@@ -201,7 +214,7 @@ func (r *Remote) newReferenceUpdateRequest(
 		}
 	}
 
-	if err := r.addReferencesToUpdate(o.RefSpecs, localRefs, remoteRefs, req); err != nil {
+	if err := r.addReferencesToUpdate(o.RefSpecs, localRefs, remoteRefs, req, o.Prune); err != nil {
 		return nil, err
 	}
 
@@ -389,6 +402,7 @@ func (r *Remote) addReferencesToUpdate(
 	localRefs []*plumbing.Reference,
 	remoteRefs storer.ReferenceStorer,
 	req *packp.ReferenceUpdateRequest,
+	prune bool,
 ) error {
 	// This references dictionary will be used to search references by name.
 	refsDict := make(map[string]*plumbing.Reference)
@@ -398,7 +412,7 @@ func (r *Remote) addReferencesToUpdate(
 
 	for _, rs := range refspecs {
 		if rs.IsDelete() {
-			if err := r.deleteReferences(rs, remoteRefs, req); err != nil {
+			if err := r.deleteReferences(rs, remoteRefs, refsDict, req, false); err != nil {
 				return err
 			}
 		} else {
@@ -406,6 +420,12 @@ func (r *Remote) addReferencesToUpdate(
 			if err != nil {
 				return err
 			}
+
+			if prune {
+				if err := r.deleteReferences(rs, remoteRefs, refsDict, req, true); err != nil {
+					return err
+				}
+			}
 		}
 	}
 
@@ -441,7 +461,10 @@ func (r *Remote) addOrUpdateReferences(
 }
 
 func (r *Remote) deleteReferences(rs config.RefSpec,
-	remoteRefs storer.ReferenceStorer, req *packp.ReferenceUpdateRequest) error {
+	remoteRefs storer.ReferenceStorer,
+	refsDict map[string]*plumbing.Reference,
+	req *packp.ReferenceUpdateRequest,
+	prune bool) error {
 	iter, err := remoteRefs.IterReferences()
 	if err != nil {
 		return err
@@ -452,8 +475,19 @@ func (r *Remote) deleteReferences(rs config.RefSpec,
 			return nil
 		}
 
-		if rs.Dst("") != ref.Name() {
-			return nil
+		if prune {
+			rs := rs.Reverse()
+			if !rs.Match(ref.Name()) {
+				return nil
+			}
+
+			if _, ok := refsDict[rs.Dst(ref.Name()).String()]; ok {
+				return nil
+			}
+		} else {
+			if rs.Dst("") != ref.Name() {
+				return nil
+			}
 		}
 
 		cmd := &packp.Command{
@@ -903,7 +937,7 @@ func (r *Remote) updateLocalReferenceStorage(
 		updated = true
 	}
 
-	if err == nil && forceNeeded {
+	if forceNeeded {
 		err = ErrForceNeeded
 	}
 
@@ -1012,10 +1046,11 @@ func pushHashes(
 	req *packp.ReferenceUpdateRequest,
 	hs []plumbing.Hash,
 	useRefDeltas bool,
+	allDelete bool,
 ) (*packp.ReportStatus, error) {
 
 	rd, wr := io.Pipe()
-	req.Packfile = rd
+
 	config, err := s.Config()
 	if err != nil {
 		return nil, err
@@ -1026,15 +1061,20 @@ func pushHashes(
 	// to the channel.
 	done := make(chan error, 1)
 
-	go func() {
-		e := packfile.NewEncoder(wr, s, useRefDeltas)
-		if _, err := e.Encode(hs, config.Pack.Window); err != nil {
-			done <- wr.CloseWithError(err)
-			return
-		}
+	if !allDelete {
+		req.Packfile = rd
+		go func() {
+			e := packfile.NewEncoder(wr, s, useRefDeltas)
+			if _, err := e.Encode(hs, config.Pack.Window); err != nil {
+				done <- wr.CloseWithError(err)
+				return
+			}
 
-		done <- wr.Close()
-	}()
+			done <- wr.Close()
+		}()
+	} else {
+		close(done)
+	}
 
 	rs, err := sess.ReceivePack(ctx, req)
 	if err != nil {