1 files changed, 93 insertions, 0 deletions
diff --git a/pkg/git/git.go b/pkg/git/git.go
index 64c721a..95355f3 100644
--- a/pkg/git/git.go
+++ b/pkg/git/git.go
@@ -3,12 +3,17 @@ package git
 import (
 	"archive/tar"
 	"bytes"
+	"context"
 	"errors"
 	"fmt"
 	"io"
 	"io/fs"
+	"log"
+	"log/slog"
+	"os/exec"
 	"path"
 	"sort"
+	"syscall"
 	"time"
 
 	"github.com/go-git/go-git/v5"
@@ -432,6 +437,66 @@ func (g *GitRepository) FileContent(path string) ([]byte, error) {
 	return buf.Bytes(), nil
 }
 
+func (g *GitRepository) WriteInfoRefs(ctx context.Context, w io.Writer) error {
+	cmd := exec.CommandContext(
+		ctx,
+		"git-upload-pack",
+		"--stateless-rpc",
+		"--advertise-refs",
+		".",
+	)
+
+	cmd.Dir = g.path
+	cmd.Stdout = w
+
+	var buff bytes.Buffer
+	cmd.Stderr = &buff
+
+	err := packLine(w, "# service=git-upload-pack\n")
+	if err != nil {
+		return err
+	}
+
+	err = packFlush(w)
+	if err != nil {
+		return err
+	}
+
+	err = cmd.Run()
+	if err != nil {
+		slog.Error("Error upload pack refs", "message", buff.String())
+		return err
+	}
+	return nil
+}
+
+func (g *GitRepository) WriteUploadPack(ctx context.Context, r io.Reader, w io.Writer) error {
+	cmd := exec.CommandContext(
+		ctx,
+		"git-upload-pack",
+		"--stateless-rpc",
+		".",
+	)
+	cmd.Dir = g.Path()
+	cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
+	var buff bytes.Buffer
+	cmd.Stderr = &buff
+	cmd.Stdin = r
+	cmd.Stdout = w
+
+	if err := cmd.Start(); err != nil {
+		log.Printf("git: failed to start git-upload-pack: %s", err)
+		return err
+	}
+
+	if err := cmd.Wait(); err != nil {
+		log.Printf("git: failed to wait for git-upload-pack: %s", buff.String())
+		return err
+	}
+
+	return nil
+}
+
 func (g *GitRepository) WriteTar(w io.Writer, prefix string) error {
 	tw := tar.NewWriter(w)
 	defer tw.Close()
@@ -613,3 +678,31 @@ func (self *tagList) Less(i, j int) bool {
 
 	return dateI.After(dateJ)
 }
+
+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
+}
+
+type debugReader struct {
+	r io.Reader
+}
+
+func (d *debugReader) Read(p []byte) (n int, err error) {
+	fmt.Printf("READ: %x\n", p)
+	return d.r.Read(p)
+}
+
+type debugWriter struct {
+	w io.Writer
+}
+
+func (d *debugWriter) Write(p []byte) (n int, err error) {
+	fmt.Printf("WRITE: %x\n", p)
+	return d.w.Write(p)
+}