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// Package git implements the git transport protocol.
package git
import (
"fmt"
"io"
"net"
"github.com/go-git/go-git/v5/plumbing/format/pktline"
"github.com/go-git/go-git/v5/plumbing/transport"
"github.com/go-git/go-git/v5/plumbing/transport/internal/common"
"github.com/go-git/go-git/v5/utils/ioutil"
)
// DefaultClient is the default git client.
var DefaultClient = common.NewClient(&runner{})
const DefaultPort = 9418
type runner struct{}
// Command returns a new Command for the given cmd in the given Endpoint
func (r *runner) Command(cmd string, ep *transport.Endpoint, auth transport.AuthMethod) (common.Command, error) {
// auth not allowed since git protocol doesn't support authentication
if auth != nil {
return nil, transport.ErrInvalidAuthMethod
}
c := &command{command: cmd, endpoint: ep}
if err := c.connect(); err != nil {
return nil, err
}
return c, nil
}
type command struct {
conn net.Conn
connected bool
command string
endpoint *transport.Endpoint
}
// Start executes the command sending the required message to the TCP connection
func (c *command) Start() error {
cmd := endpointToCommand(c.command, c.endpoint)
e := pktline.NewEncoder(c.conn)
return e.Encode([]byte(cmd))
}
func (c *command) connect() error {
if c.connected {
return transport.ErrAlreadyConnected
}
var err error
c.conn, err = net.Dial("tcp", c.getHostWithPort())
if err != nil {
return err
}
c.connected = true
return nil
}
func (c *command) getHostWithPort() string {
host := c.endpoint.Host
port := c.endpoint.Port
if port <= 0 {
port = DefaultPort
}
return fmt.Sprintf("%s:%d", host, port)
}
// StderrPipe git protocol doesn't have any dedicated error channel
func (c *command) StderrPipe() (io.Reader, error) {
return nil, nil
}
// StdinPipe returns the underlying connection as WriteCloser, wrapped to prevent
// call to the Close function from the connection, a command execution in git
// protocol can't be closed or killed
func (c *command) StdinPipe() (io.WriteCloser, error) {
return ioutil.WriteNopCloser(c.conn), nil
}
// StdoutPipe returns the underlying connection as Reader
func (c *command) StdoutPipe() (io.Reader, error) {
return c.conn, nil
}
func endpointToCommand(cmd string, ep *transport.Endpoint) string {
host := ep.Host
if ep.Port != DefaultPort {
host = fmt.Sprintf("%s:%d", ep.Host, ep.Port)
}
return fmt.Sprintf("%s %s%chost=%s%c", cmd, ep.Path, 0, host, 0)
}
// Close closes the TCP connection and connection.
func (c *command) Close() error {
if !c.connected {
return nil
}
c.connected = false
return c.conn.Close()
}
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