package service
import (
"bytes"
"fmt"
"io"
"log"
"net/http"
"os/exec"
"strings"
"syscall"
)
// Mostly from charmbracelet/soft-serve and sosedoff/gitkit.
type ServiceCommand struct {
Dir string
Stdin io.Reader
Stdout http.ResponseWriter
}
func (c *ServiceCommand) InfoRefs() error {
cmd := exec.Command("git", []string{
"upload-pack",
"--stateless-rpc",
"--advertise-refs",
".",
}...)
cmd.Dir = c.Dir
cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
stdoutPipe, _ := cmd.StdoutPipe()
cmd.Stderr = cmd.Stdout
if err := cmd.Start(); err != nil {
log.Printf("git: failed to start git-upload-pack (info/refs): %s", err)
return err
}
if err := packLine(c.Stdout, "# service=git-upload-pack\n"); err != nil {
log.Printf("git: failed to write pack line: %s", err)
return err
}
if err := packFlush(c.Stdout); err != nil {
log.Printf("git: failed to flush pack: %s", err)
return err
}
buf := bytes.Buffer{}
if _, err := io.Copy(&buf, stdoutPipe); err != nil {
log.Printf("git: failed to copy stdout to tmp buffer: %s", err)
return err
}
if err := cmd.Wait(); err != nil {
out := strings.Builder{}
_, _ = io.Copy(&out, &buf)
log.Printf("git: failed to run git-upload-pack; err: %s; output: %s", err, out.String())
return err
}
if _, err := io.Copy(c.Stdout, &buf); err != nil {
log.Printf("git: failed to copy stdout: %s", err)
}
return nil
}
func (c *ServiceCommand) UploadPack() error {
cmd := exec.Command("git", []string{
"-c", "uploadpack.allowFilter=true",
"upload-pack",
"--stateless-rpc",
".",
}...)
cmd.Dir = c.Dir
cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
stdoutPipe, _ := cmd.StdoutPipe()
cmd.Stderr = cmd.Stdout
defer stdoutPipe.Close()
stdinPipe, err := cmd.StdinPipe()
if err != nil {
return err
}
defer stdinPipe.Close()
if err := cmd.Start(); err != nil {
log.Printf("git: failed to start git-upload-pack: %s", err)
return err
}
if _, err := io.Copy(stdinPipe, c.Stdin); err != nil {
log.Printf("git: failed to copy stdin: %s", err)
return err
}
stdinPipe.Close()
if _, err := io.Copy(newWriteFlusher(c.Stdout), stdoutPipe); err != nil {
log.Printf("git: failed to copy stdout: %s", err)
return err
}
if err := cmd.Wait(); err != nil {
log.Printf("git: failed to wait for git-upload-pack: %s", err)
return err
}
return nil
}
func packLine(w io.Writer, s string) error {
_, err := fmt.Fprintf(w, "%04x%s", len(s)+4, s)
return err
}
func packFlush(w io.Writer) error {
_, err := fmt.Fprint(w, "0000")
return err
}
