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|
package main
import (
"bufio"
"bytes"
"context"
"crypto/sha1"
"encoding/binary"
"fmt"
"io"
"log"
"os"
"os/exec"
"regexp"
"strings"
)
const bundleFileName = "clone.bundle"
func main() {
if len(os.Args) < 2 {
log.Fatal("not enough argument to pack-objects hook")
}
if err := _main(os.Args[1:]); err != nil {
log.Fatal(err)
}
}
var shaRegex = regexp.MustCompile(`\A[0-9a-f]{40}\z`)
func _main(packObjects []string) error {
request := &bytes.Buffer{}
scanner := bufio.NewScanner(io.TeeReader(os.Stdin, request))
seenNot := false
isClone := true
for scanner.Scan() {
if !seenNot && scanner.Text() == "--not" {
seenNot = true
continue
}
if seenNot && scanner.Text() != "" {
isClone = false
}
}
if err := scanner.Err(); err != nil {
return err
}
if !isClone {
return fallback(packObjects, request)
}
bundleFile, err := os.Open(bundleFileName)
if err != nil {
return fallback(packObjects, request)
}
defer bundleFile.Close()
bundle := bufio.NewReader(bundleFile)
request = bytes.NewBuffer(bytes.TrimSpace(request.Bytes()))
if _, err := request.WriteString("\n"); err != nil {
return err
}
if err := addBundleRefsToRequest(request, bundle); err != nil {
return err
}
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
cmd := exec.CommandContext(ctx, packObjects[0], packObjects[1:]...)
cmd.Stdin = request
cmd.Stderr = os.Stderr
packObjectsOut, err := cmd.StdoutPipe()
if err != nil {
return err
}
if err := cmd.Start(); err != nil {
return err
}
packObjectsReader, err := NewPackReader(packObjectsOut)
if err != nil {
return err
}
bundleReader, err := NewPackReader(bundle)
if err != nil {
return err
}
summer := sha1.New()
stdout := io.MultiWriter(os.Stdout, summer)
if _, err := fmt.Fprint(stdout, packMagic); err != nil {
return err
}
size := make([]byte, 4)
binary.BigEndian.PutUint32(size, packObjectsReader.NumObjects()+bundleReader.NumObjects()) // TODO check for overflow
if _, err := stdout.Write(size); err != nil {
return err
}
if _, err := io.Copy(stdout, packObjectsReader); err != nil {
return err
}
if err := cmd.Wait(); err != nil {
return err
}
if _, err := io.Copy(stdout, bundleReader); err != nil {
return err
}
if _, err := stdout.Write(summer.Sum(nil)); err != nil {
return err
}
fmt.Fprintf(os.Stderr, "re-used from %s: %d objects\n", bundleFileName, bundleReader.NumObjects())
return nil
}
func fallback(packObjects []string, request io.Reader) error {
cmd := exec.Command(packObjects[0], packObjects[1:]...)
cmd.Stdin = request
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
return cmd.Run()
}
func readLine(r *bufio.Reader) (string, error) {
line, err := r.ReadBytes('\n')
if err != nil {
return "", err
}
return string(line[:len(line)-1]), nil
}
func addBundleRefsToRequest(request io.Writer, bundle *bufio.Reader) error {
bundleHeader, err := readLine(bundle)
if err != nil {
return err
}
if bundleHeader != "# v2 git bundle" {
return fmt.Errorf("unexpected bundle header: %q", bundleHeader)
}
for {
refLine, err := readLine(bundle)
if err != nil {
return err
}
if refLine == "" {
break
}
split := strings.SplitN(refLine, " ", 2)
if len(split) != 2 {
return fmt.Errorf("invalid ref line: %q", refLine)
}
id := split[0]
if !shaRegex.MatchString(id) {
return fmt.Errorf("invalid object ID: %q", id)
}
if _, err := fmt.Fprintln(request, id); err != nil {
return err
}
}
return nil
}
|
