transport: add local transport (#145)

* transport: move common packp protocol out of ssh transport.
* fixtures: add fixture for empty repository.
* transport: add file:// transport

2 files changed, 5 insertions, 2 deletions

diff --git a/plumbing/transport/client/client.go b/plumbing/transport/client/client.go
index 5c6da05..770b7dc 100644
--- a/plumbing/transport/client/client.go
+++ b/plumbing/transport/client/client.go
@@ -4,6 +4,7 @@ import (
 	"fmt"
 
 	"gopkg.in/src-d/go-git.v4/plumbing/transport"
+	"gopkg.in/src-d/go-git.v4/plumbing/transport/file"
 	"gopkg.in/src-d/go-git.v4/plumbing/transport/http"
 	"gopkg.in/src-d/go-git.v4/plumbing/transport/ssh"
 )
@@ -13,6 +14,7 @@ var Protocols = map[string]transport.Client{
 	"http":  http.DefaultClient,
 	"https": http.DefaultClient,
 	"ssh":   ssh.DefaultClient,
+	"file":  file.DefaultClient,
 }
 
 // InstallProtocol adds or modifies an existing protocol.
@@ -21,7 +23,8 @@ func InstallProtocol(scheme string, c transport.Client) {
 }
 
 // NewClient returns the appropriate client among of the set of known protocols:
-// HTTP, SSH. See `InstallProtocol` to add or modify protocols.
+// http://, https://, ssh:// and file://.
+// See `InstallProtocol` to add or modify protocols.
 func NewClient(endpoint transport.Endpoint) (transport.Client, error) {
 	f, ok := Protocols[endpoint.Scheme]
 	if !ok {
diff --git a/plumbing/transport/client/client_test.go b/plumbing/transport/client/client_test.go
index 0f4b2e5..a0c8208 100644
--- a/plumbing/transport/client/client_test.go
+++ b/plumbing/transport/client/client_test.go
@@ -38,7 +38,7 @@ func (s *ClientSuite) TestNewClientSSH(c *C) {
 
 	output, err := NewClient(e)
 	c.Assert(err, IsNil)
-	c.Assert(typeAsString(output), Equals, "*ssh.client")
+	c.Assert(output, NotNil)
 }
 
 func (s *ClientSuite) TestNewClientUnknown(c *C) {