server: add git server implementation (#190)

* server: add generic server implementation (transport-independent),
  both for git-upload-pack and git-receive-pack.
* server: move internal functions to internal/common.
* cli: add git-receive-pack and git-upload-pack implementations.
* format/packfile: add UpdateObjectStorage function, extracted from
  Remote.
* transport: implement tranport RPC-like, only with git-upload-pack and
  git-receive-pack methods. Client renamed to Transport.
* storer: add storer.Storer interface.
* protocol/packp: add UploadPackResponse constructor with packfile.
* protocol/packp: fix UploadPackResponse encoding, add tests.
* protocol/packp/capability: implement All.

1 files changed, 51 insertions, 0 deletions

diff --git a/plumbing/transport/file/server.go b/plumbing/transport/file/server.go
new file mode 100644
index 0000000..d83d5d9
--- /dev/null
+++ b/plumbing/transport/file/server.go
@@ -0,0 +1,51 @@
+package file
+
+import (
+	"fmt"
+	"os"
+
+	"gopkg.in/src-d/go-git.v4/plumbing/transport"
+	"gopkg.in/src-d/go-git.v4/plumbing/transport/internal/common"
+	"gopkg.in/src-d/go-git.v4/plumbing/transport/server"
+	"gopkg.in/src-d/go-git.v4/utils/ioutil"
+)
+
+// ServeUploadPack serves a git-upload-pack request using standard output, input
+// and error. This is meant to be used when implementing a git-upload-pack
+// command.
+func ServeUploadPack(path string) error {
+	ep, err := transport.NewEndpoint(fmt.Sprintf("file://%s", path))
+	if err != nil {
+		return err
+	}
+
+	s, err := server.DefaultServer.NewUploadPackSession(ep)
+	if err != nil {
+		return fmt.Errorf("error creating session: %s", err)
+	}
+
+	return common.ServeUploadPack(srvCmd, s)
+}
+
+// ServeReceivePack serves a git-receive-pack request using standard output,
+// input and error. This is meant to be used when implementing a
+// git-receive-pack command.
+func ServeReceivePack(path string) error {
+	ep, err := transport.NewEndpoint(fmt.Sprintf("file://%s", path))
+	if err != nil {
+		return err
+	}
+
+	s, err := server.DefaultServer.NewReceivePackSession(ep)
+	if err != nil {
+		return fmt.Errorf("error creating session: %s", err)
+	}
+
+	return common.ServeReceivePack(srvCmd, s)
+}
+
+var srvCmd = common.ServerCommand{
+	Stdin:  os.Stdin,
+	Stdout: ioutil.WriteNopCloser(os.Stdout),
+	Stderr: os.Stderr,
+}