transport: add local transport (#145)

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

3 files changed, 129 insertions, 0 deletions

diff --git a/plumbing/transport/file/common.go b/plumbing/transport/file/common.go
new file mode 100644
index 0000000..82cbba2
--- /dev/null
+++ b/plumbing/transport/file/common.go
@@ -0,0 +1,72 @@
+package file
+
+import (
+	"io"
+	"os/exec"
+
+	"gopkg.in/src-d/go-git.v4/plumbing/transport"
+	"gopkg.in/src-d/go-git.v4/plumbing/transport/internal/common"
+)
+
+// DefaultClient is the default local client.
+var DefaultClient = NewClient(
+	transport.UploadPackServiceName,
+	transport.ReceivePackServiceName,
+)
+
+type runner struct {
+	UploadPackBin  string
+	ReceivePackBin string
+}
+
+// NewClient returns a new local client using the given git-upload-pack and
+// git-receive-pack binaries.
+func NewClient(uploadPackBin, receivePackBin string) transport.Client {
+	return common.NewClient(&runner{
+		UploadPackBin:  uploadPackBin,
+		ReceivePackBin: receivePackBin,
+	})
+}
+
+func (r *runner) Command(cmd string, ep transport.Endpoint) (common.Command, error) {
+	return &command{cmd: exec.Command(cmd, ep.Path)}, nil
+}
+
+type command struct {
+	cmd    *exec.Cmd
+	closed bool
+}
+
+func (c *command) SetAuth(auth transport.AuthMethod) error {
+	if auth != nil {
+		return transport.ErrInvalidAuthMethod
+	}
+
+	return nil
+}
+
+func (c *command) Start() error {
+	return c.cmd.Start()
+}
+
+func (c *command) StderrPipe() (io.Reader, error) {
+	return c.cmd.StderrPipe()
+}
+
+func (c *command) StdinPipe() (io.WriteCloser, error) {
+	return c.cmd.StdinPipe()
+}
+
+func (c *command) StdoutPipe() (io.Reader, error) {
+	return c.cmd.StdoutPipe()
+}
+
+// Close waits for the command to exit.
+func (c *command) Close() error {
+	return c.cmd.Process.Kill()
+}
+
+func (c *command) Wait() error {
+	defer func() { c.closed = true }()
+	return c.cmd.Wait()
+}
diff --git a/plumbing/transport/file/common_test.go b/plumbing/transport/file/common_test.go
new file mode 100644
index 0000000..94ca4c9
--- /dev/null
+++ b/plumbing/transport/file/common_test.go
@@ -0,0 +1,9 @@
+package file
+
+import (
+	"testing"
+
+	. "gopkg.in/check.v1"
+)
+
+func Test(t *testing.T) { TestingT(t) }
diff --git a/plumbing/transport/file/fetch_pack_test.go b/plumbing/transport/file/fetch_pack_test.go
new file mode 100644
index 0000000..80f11ee
--- /dev/null
+++ b/plumbing/transport/file/fetch_pack_test.go
@@ -0,0 +1,48 @@
+package file
+
+import (
+	"fmt"
+	"os/exec"
+
+	"gopkg.in/src-d/go-git.v4/fixtures"
+	"gopkg.in/src-d/go-git.v4/plumbing/transport"
+	"gopkg.in/src-d/go-git.v4/plumbing/transport/test"
+
+	. "gopkg.in/check.v1"
+)
+
+type FetchPackSuite struct {
+	fixtures.Suite
+	test.FetchPackSuite
+}
+
+var _ = Suite(&FetchPackSuite{})
+
+func (s *FetchPackSuite) SetUpSuite(c *C) {
+	s.Suite.SetUpSuite(c)
+
+	if err := exec.Command("git", "--version").Run(); err != nil {
+		c.Skip("git command not found")
+	}
+
+	s.FetchPackSuite.Client = DefaultClient
+
+	fixture := fixtures.Basic().One()
+	path := fixture.DotGit().Base()
+	url := fmt.Sprintf("file://%s", path)
+	ep, err := transport.NewEndpoint(url)
+	c.Assert(err, IsNil)
+	s.Endpoint = ep
+
+	fixture = fixtures.ByTag("empty").One()
+	path = fixture.DotGit().Base()
+	url = fmt.Sprintf("file://%s", path)
+	ep, err = transport.NewEndpoint(url)
+	c.Assert(err, IsNil)
+	s.EmptyEndpoint = ep
+
+	url = fmt.Sprintf("file://%s/%s", fixtures.DataFolder, "non-existent")
+	ep, err = transport.NewEndpoint(url)
+	c.Assert(err, IsNil)
+	s.NonExistentEndpoint = ep
+}