git/service/service.go (view raw)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 | package service
import (
"bytes"
"context"
"errors"
"fmt"
"io"
"log"
"net/http"
"os/exec"
"strings"
"syscall"
"time"
)
const timeout = 1 * time.Minute
// Mostly from charmbracelet/soft-serve and sosedoff/gitkit.
type ServiceCommand struct {
Dir string
Stdin io.Reader
Stdout http.ResponseWriter
}
func (c *ServiceCommand) InfoRefs(ctx context.Context) error {
ctx, cancel := context.WithTimeout(ctx, timeout)
defer cancel()
cmd := exec.CommandContext(ctx, "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(ctx context.Context) (err error) {
ctx, cancel := context.WithTimeout(ctx, timeout)
defer cancel()
cmd := exec.CommandContext(ctx, "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 func() {
err2 := stdoutPipe.Close()
if err == nil {
err = errors.Join(err, err2)
}
}()
stdinPipe, err := cmd.StdinPipe()
if err != nil {
return err
}
defer func() {
err2 := stdinPipe.Close()
if err == nil {
err = errors.Join(err, err2)
}
}()
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
}
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
}
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