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// Package file implements the file transport protocol.
package file
import (
"bufio"
"errors"
"io"
"os"
"path/filepath"
"strings"
"github.com/go-git/go-git/v5/plumbing/transport"
"github.com/go-git/go-git/v5/plumbing/transport/internal/common"
"golang.org/x/sys/execabs"
)
// 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.Transport {
return common.NewClient(&runner{
UploadPackBin: uploadPackBin,
ReceivePackBin: receivePackBin,
})
}
func prefixExecPath(cmd string) (string, error) {
// Use `git --exec-path` to find the exec path.
execCmd := execabs.Command("git", "--exec-path")
stdout, err := execCmd.StdoutPipe()
if err != nil {
return "", err
}
stdoutBuf := bufio.NewReader(stdout)
err = execCmd.Start()
if err != nil {
return "", err
}
execPathBytes, isPrefix, err := stdoutBuf.ReadLine()
if err != nil {
return "", err
}
if isPrefix {
return "", errors.New("couldn't read exec-path line all at once")
}
err = execCmd.Wait()
if err != nil {
return "", err
}
execPath := string(execPathBytes)
execPath = strings.TrimSpace(execPath)
cmd = filepath.Join(execPath, cmd)
// Make sure it actually exists.
_, err = execabs.LookPath(cmd)
if err != nil {
return "", err
}
return cmd, nil
}
func (r *runner) Command(cmd string, ep *transport.Endpoint, auth transport.AuthMethod,
) (common.Command, error) {
switch cmd {
case transport.UploadPackServiceName:
cmd = r.UploadPackBin
case transport.ReceivePackServiceName:
cmd = r.ReceivePackBin
}
_, err := execabs.LookPath(cmd)
if err != nil {
if e, ok := err.(*execabs.Error); ok && e.Err == execabs.ErrNotFound {
cmd, err = prefixExecPath(cmd)
if err != nil {
return nil, err
}
} else {
return nil, err
}
}
return &command{cmd: execabs.Command(cmd, ep.Path)}, nil
}
type command struct {
cmd *execabs.Cmd
stderrCloser io.Closer
closed bool
}
func (c *command) Start() error {
return c.cmd.Start()
}
func (c *command) StderrPipe() (io.Reader, error) {
// Pipe returned by Command.StderrPipe has a race with Read + Command.Wait.
// We use an io.Pipe and close it after the command finishes.
r, w := io.Pipe()
c.cmd.Stderr = w
c.stderrCloser = r
return r, nil
}
func (c *command) StdinPipe() (io.WriteCloser, error) {
return c.cmd.StdinPipe()
}
func (c *command) StdoutPipe() (io.Reader, error) {
return c.cmd.StdoutPipe()
}
func (c *command) Kill() error {
c.cmd.Process.Kill()
return c.Close()
}
// Close waits for the command to exit.
func (c *command) Close() error {
if c.closed {
return nil
}
defer func() {
c.closed = true
_ = c.stderrCloser.Close()
}()
err := c.cmd.Wait()
if _, ok := err.(*os.PathError); ok {
return nil
}
// When a repository does not exist, the command exits with code 128.
if _, ok := err.(*execabs.ExitError); ok {
return nil
}
return err
}
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