1 files changed, 94 insertions, 0 deletions
diff --git a/plumbing/serverinfo/serverinfo.go b/plumbing/serverinfo/serverinfo.go
new file mode 100644
index 0000000..d7ea7ef
--- /dev/null
+++ b/plumbing/serverinfo/serverinfo.go
@@ -0,0 +1,94 @@
+package serverinfo
+
+import (
+	"fmt"
+
+	"github.com/go-git/go-billy/v5"
+	"github.com/go-git/go-git/v5"
+	"github.com/go-git/go-git/v5/internal/reference"
+	"github.com/go-git/go-git/v5/plumbing"
+	"github.com/go-git/go-git/v5/plumbing/object"
+	"github.com/go-git/go-git/v5/plumbing/storer"
+	"github.com/go-git/go-git/v5/storage"
+)
+
+// UpdateServerInfo updates the server info files in the repository.
+//
+// It generates a list of available refs for the repository.
+// Used by git http transport (dumb), for more information refer to:
+// https://git-scm.com/book/id/v2/Git-Internals-Transfer-Protocols#_the_dumb_protocol
+func UpdateServerInfo(s storage.Storer, fs billy.Filesystem) error {
+	pos, ok := s.(storer.PackedObjectStorer)
+	if !ok {
+		return git.ErrPackedObjectsNotSupported
+	}
+
+	infoRefs, err := fs.Create("info/refs")
+	if err != nil {
+		return err
+	}
+
+	defer infoRefs.Close()
+
+	refsIter, err := s.IterReferences()
+	if err != nil {
+		return err
+	}
+
+	defer refsIter.Close()
+
+	var refs []*plumbing.Reference
+	if err := refsIter.ForEach(func(ref *plumbing.Reference) error {
+		refs = append(refs, ref)
+		return nil
+	}); err != nil {
+		return err
+	}
+
+	reference.Sort(refs)
+	for _, ref := range refs {
+		name := ref.Name()
+		hash := ref.Hash()
+		switch ref.Type() {
+		case plumbing.SymbolicReference:
+			if name == plumbing.HEAD {
+				continue
+			}
+			ref, err := s.Reference(ref.Target())
+			if err != nil {
+				return err
+			}
+
+			hash = ref.Hash()
+			fallthrough
+		case plumbing.HashReference:
+			fmt.Fprintf(infoRefs, "%s\t%s\n", hash, name)
+			if name.IsTag() {
+				tag, err := object.GetTag(s, hash)
+				if err == nil {
+					fmt.Fprintf(infoRefs, "%s\t%s^{}\n", tag.Target, name)
+				}
+			}
+		}
+	}
+
+	infoPacks, err := fs.Create("objects/info/packs")
+	if err != nil {
+		return err
+	}
+
+	defer infoPacks.Close()
+
+	packs, err := pos.ObjectPacks()
+	if err != nil {
+		return err
+	}
+
+	for _, p := range packs {
+		fmt.Fprintf(infoPacks, "P pack-%s.pack\n", p)
+	}
+
+	fmt.Fprintln(infoPacks)
+
+	return nil
+}