2c8bcc163e
- Use `Fprintf` to convert to hex and do padding. Simplifies the code. - Use `Read()` and `io.ReadFull` instead of `ReadByte()`. Should improve performance and allows for cleaner code. - s/pktLineTypeUnknow/pktLineTypeUnknown. - Disallow empty Pkt line per the specification. - Disallow too large Pkt line per the specification. - Add unit tests.
790 lines
21 KiB
Go
790 lines
21 KiB
Go
// Copyright 2017 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package cmd
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import (
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"bufio"
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"bytes"
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"context"
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"fmt"
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"io"
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"os"
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"strconv"
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"strings"
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"time"
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"code.gitea.io/gitea/modules/git"
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"code.gitea.io/gitea/modules/log"
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"code.gitea.io/gitea/modules/private"
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repo_module "code.gitea.io/gitea/modules/repository"
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"code.gitea.io/gitea/modules/setting"
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"github.com/urfave/cli/v2"
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)
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const (
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hookBatchSize = 30
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)
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var (
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// CmdHook represents the available hooks sub-command.
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CmdHook = &cli.Command{
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Name: "hook",
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Usage: "(internal) Should only be called by Git",
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Description: "Delegate commands to corresponding Git hooks",
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Before: PrepareConsoleLoggerLevel(log.FATAL),
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Subcommands: []*cli.Command{
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subcmdHookPreReceive,
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subcmdHookUpdate,
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subcmdHookPostReceive,
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subcmdHookProcReceive,
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},
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}
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subcmdHookPreReceive = &cli.Command{
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Name: "pre-receive",
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Usage: "Delegate pre-receive Git hook",
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Description: "This command should only be called by Git",
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Action: runHookPreReceive,
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Flags: []cli.Flag{
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&cli.BoolFlag{
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Name: "debug",
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},
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},
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}
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subcmdHookUpdate = &cli.Command{
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Name: "update",
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Usage: "Delegate update Git hook",
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Description: "This command should only be called by Git",
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Action: runHookUpdate,
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Flags: []cli.Flag{
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&cli.BoolFlag{
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Name: "debug",
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},
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},
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}
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subcmdHookPostReceive = &cli.Command{
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Name: "post-receive",
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Usage: "Delegate post-receive Git hook",
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Description: "This command should only be called by Git",
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Action: runHookPostReceive,
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Flags: []cli.Flag{
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&cli.BoolFlag{
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Name: "debug",
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},
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},
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}
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// Note: new hook since git 2.29
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subcmdHookProcReceive = &cli.Command{
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Name: "proc-receive",
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Usage: "Delegate proc-receive Git hook",
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Description: "This command should only be called by Git",
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Action: runHookProcReceive,
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Flags: []cli.Flag{
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&cli.BoolFlag{
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Name: "debug",
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},
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},
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}
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)
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type delayWriter struct {
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internal io.Writer
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buf *bytes.Buffer
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timer *time.Timer
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}
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func newDelayWriter(internal io.Writer, delay time.Duration) *delayWriter {
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timer := time.NewTimer(delay)
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return &delayWriter{
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internal: internal,
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buf: &bytes.Buffer{},
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timer: timer,
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}
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}
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func (d *delayWriter) Write(p []byte) (n int, err error) {
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if d.buf != nil {
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select {
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case <-d.timer.C:
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_, err := d.internal.Write(d.buf.Bytes())
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if err != nil {
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return 0, err
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}
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d.buf = nil
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return d.internal.Write(p)
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default:
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return d.buf.Write(p)
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}
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}
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return d.internal.Write(p)
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}
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func (d *delayWriter) WriteString(s string) (n int, err error) {
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if d.buf != nil {
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select {
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case <-d.timer.C:
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_, err := d.internal.Write(d.buf.Bytes())
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if err != nil {
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return 0, err
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}
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d.buf = nil
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return d.internal.Write([]byte(s))
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default:
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return d.buf.WriteString(s)
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}
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}
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return d.internal.Write([]byte(s))
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}
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func (d *delayWriter) Close() error {
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if d == nil {
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return nil
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}
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stopped := d.timer.Stop()
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if stopped || d.buf == nil {
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return nil
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}
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_, err := d.internal.Write(d.buf.Bytes())
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d.buf = nil
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return err
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}
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type nilWriter struct{}
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func (n *nilWriter) Write(p []byte) (int, error) {
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return len(p), nil
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}
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func (n *nilWriter) WriteString(s string) (int, error) {
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return len(s), nil
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}
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func runHookPreReceive(c *cli.Context) error {
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if isInternal, _ := strconv.ParseBool(os.Getenv(repo_module.EnvIsInternal)); isInternal {
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return nil
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}
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ctx, cancel := installSignals()
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defer cancel()
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setup(ctx, c.Bool("debug"))
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if len(os.Getenv("SSH_ORIGINAL_COMMAND")) == 0 {
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if setting.OnlyAllowPushIfGiteaEnvironmentSet {
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return fail(ctx, `Rejecting changes as Forgejo environment not set.
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If you are pushing over SSH you must push with a key managed by
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Forgejo or set your environment appropriately.`, "")
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}
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return nil
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}
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// the environment is set by serv command
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isWiki, _ := strconv.ParseBool(os.Getenv(repo_module.EnvRepoIsWiki))
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username := os.Getenv(repo_module.EnvRepoUsername)
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reponame := os.Getenv(repo_module.EnvRepoName)
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userID, _ := strconv.ParseInt(os.Getenv(repo_module.EnvPusherID), 10, 64)
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prID, _ := strconv.ParseInt(os.Getenv(repo_module.EnvPRID), 10, 64)
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deployKeyID, _ := strconv.ParseInt(os.Getenv(repo_module.EnvDeployKeyID), 10, 64)
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actionPerm, _ := strconv.ParseInt(os.Getenv(repo_module.EnvActionPerm), 10, 64)
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hookOptions := private.HookOptions{
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UserID: userID,
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GitAlternativeObjectDirectories: os.Getenv(private.GitAlternativeObjectDirectories),
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GitObjectDirectory: os.Getenv(private.GitObjectDirectory),
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GitQuarantinePath: os.Getenv(private.GitQuarantinePath),
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GitPushOptions: pushOptions(),
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PullRequestID: prID,
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DeployKeyID: deployKeyID,
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ActionPerm: int(actionPerm),
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}
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scanner := bufio.NewScanner(os.Stdin)
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oldCommitIDs := make([]string, hookBatchSize)
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newCommitIDs := make([]string, hookBatchSize)
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refFullNames := make([]git.RefName, hookBatchSize)
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count := 0
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total := 0
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lastline := 0
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var out io.Writer
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out = &nilWriter{}
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if setting.Git.VerbosePush {
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if setting.Git.VerbosePushDelay > 0 {
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dWriter := newDelayWriter(os.Stdout, setting.Git.VerbosePushDelay)
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defer dWriter.Close()
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out = dWriter
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} else {
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out = os.Stdout
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}
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}
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supportProcReceive := false
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if git.CheckGitVersionAtLeast("2.29") == nil {
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supportProcReceive = true
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}
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for scanner.Scan() {
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// TODO: support news feeds for wiki
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if isWiki {
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continue
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}
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fields := bytes.Fields(scanner.Bytes())
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if len(fields) != 3 {
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continue
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}
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oldCommitID := string(fields[0])
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newCommitID := string(fields[1])
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refFullName := git.RefName(fields[2])
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total++
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lastline++
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// If the ref is a branch or tag, check if it's protected
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// if supportProcReceive all ref should be checked because
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// permission check was delayed
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if supportProcReceive || refFullName.IsBranch() || refFullName.IsTag() {
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oldCommitIDs[count] = oldCommitID
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newCommitIDs[count] = newCommitID
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refFullNames[count] = refFullName
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count++
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fmt.Fprintf(out, "*")
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if count >= hookBatchSize {
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fmt.Fprintf(out, " Checking %d references\n", count)
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hookOptions.OldCommitIDs = oldCommitIDs
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hookOptions.NewCommitIDs = newCommitIDs
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hookOptions.RefFullNames = refFullNames
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extra := private.HookPreReceive(ctx, username, reponame, hookOptions)
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if extra.HasError() {
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return fail(ctx, extra.UserMsg, "HookPreReceive(batch) failed: %v", extra.Error)
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}
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count = 0
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lastline = 0
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}
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} else {
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fmt.Fprintf(out, ".")
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}
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if lastline >= hookBatchSize {
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fmt.Fprintf(out, "\n")
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lastline = 0
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}
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}
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if count > 0 {
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hookOptions.OldCommitIDs = oldCommitIDs[:count]
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hookOptions.NewCommitIDs = newCommitIDs[:count]
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hookOptions.RefFullNames = refFullNames[:count]
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fmt.Fprintf(out, " Checking %d references\n", count)
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extra := private.HookPreReceive(ctx, username, reponame, hookOptions)
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if extra.HasError() {
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return fail(ctx, extra.UserMsg, "HookPreReceive(last) failed: %v", extra.Error)
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}
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} else if lastline > 0 {
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fmt.Fprintf(out, "\n")
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}
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fmt.Fprintf(out, "Checked %d references in total\n", total)
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return nil
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}
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func runHookUpdate(c *cli.Context) error {
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// Update is empty and is kept only for backwards compatibility
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return nil
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}
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func runHookPostReceive(c *cli.Context) error {
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ctx, cancel := installSignals()
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defer cancel()
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setup(ctx, c.Bool("debug"))
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// First of all run update-server-info no matter what
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if _, _, err := git.NewCommand(ctx, "update-server-info").RunStdString(nil); err != nil {
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return fmt.Errorf("Failed to call 'git update-server-info': %w", err)
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}
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// Now if we're an internal don't do anything else
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if isInternal, _ := strconv.ParseBool(os.Getenv(repo_module.EnvIsInternal)); isInternal {
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return nil
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}
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if len(os.Getenv("SSH_ORIGINAL_COMMAND")) == 0 {
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if setting.OnlyAllowPushIfGiteaEnvironmentSet {
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return fail(ctx, `Rejecting changes as Forgejo environment not set.
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If you are pushing over SSH you must push with a key managed by
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Forgejo or set your environment appropriately.`, "")
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}
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return nil
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}
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var out io.Writer
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var dWriter *delayWriter
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out = &nilWriter{}
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if setting.Git.VerbosePush {
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if setting.Git.VerbosePushDelay > 0 {
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dWriter = newDelayWriter(os.Stdout, setting.Git.VerbosePushDelay)
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defer dWriter.Close()
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out = dWriter
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} else {
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out = os.Stdout
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}
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}
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// the environment is set by serv command
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repoUser := os.Getenv(repo_module.EnvRepoUsername)
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isWiki, _ := strconv.ParseBool(os.Getenv(repo_module.EnvRepoIsWiki))
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repoName := os.Getenv(repo_module.EnvRepoName)
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pusherID, _ := strconv.ParseInt(os.Getenv(repo_module.EnvPusherID), 10, 64)
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pusherName := os.Getenv(repo_module.EnvPusherName)
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hookOptions := private.HookOptions{
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UserName: pusherName,
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UserID: pusherID,
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GitAlternativeObjectDirectories: os.Getenv(private.GitAlternativeObjectDirectories),
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GitObjectDirectory: os.Getenv(private.GitObjectDirectory),
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GitQuarantinePath: os.Getenv(private.GitQuarantinePath),
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GitPushOptions: pushOptions(),
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}
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oldCommitIDs := make([]string, hookBatchSize)
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newCommitIDs := make([]string, hookBatchSize)
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refFullNames := make([]git.RefName, hookBatchSize)
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count := 0
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total := 0
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wasEmpty := false
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masterPushed := false
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results := make([]private.HookPostReceiveBranchResult, 0)
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scanner := bufio.NewScanner(os.Stdin)
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for scanner.Scan() {
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// TODO: support news feeds for wiki
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if isWiki {
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continue
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}
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fields := bytes.Fields(scanner.Bytes())
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if len(fields) != 3 {
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continue
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}
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fmt.Fprintf(out, ".")
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oldCommitIDs[count] = string(fields[0])
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newCommitIDs[count] = string(fields[1])
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refFullNames[count] = git.RefName(fields[2])
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commitID, _ := git.NewIDFromString(newCommitIDs[count])
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if refFullNames[count] == git.BranchPrefix+"master" && !commitID.IsZero() && count == total {
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masterPushed = true
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}
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count++
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total++
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if count >= hookBatchSize {
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fmt.Fprintf(out, " Processing %d references\n", count)
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hookOptions.OldCommitIDs = oldCommitIDs
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hookOptions.NewCommitIDs = newCommitIDs
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hookOptions.RefFullNames = refFullNames
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resp, extra := private.HookPostReceive(ctx, repoUser, repoName, hookOptions)
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if extra.HasError() {
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_ = dWriter.Close()
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hookPrintResults(results)
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return fail(ctx, extra.UserMsg, "HookPostReceive failed: %v", extra.Error)
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}
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wasEmpty = wasEmpty || resp.RepoWasEmpty
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results = append(results, resp.Results...)
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count = 0
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}
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}
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if count == 0 {
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if wasEmpty && masterPushed {
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// We need to tell the repo to reset the default branch to master
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extra := private.SetDefaultBranch(ctx, repoUser, repoName, "master")
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if extra.HasError() {
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return fail(ctx, extra.UserMsg, "SetDefaultBranch failed: %v", extra.Error)
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}
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}
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fmt.Fprintf(out, "Processed %d references in total\n", total)
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_ = dWriter.Close()
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hookPrintResults(results)
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return nil
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}
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hookOptions.OldCommitIDs = oldCommitIDs[:count]
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hookOptions.NewCommitIDs = newCommitIDs[:count]
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hookOptions.RefFullNames = refFullNames[:count]
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fmt.Fprintf(out, " Processing %d references\n", count)
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resp, extra := private.HookPostReceive(ctx, repoUser, repoName, hookOptions)
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if resp == nil {
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_ = dWriter.Close()
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hookPrintResults(results)
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return fail(ctx, extra.UserMsg, "HookPostReceive failed: %v", extra.Error)
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}
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wasEmpty = wasEmpty || resp.RepoWasEmpty
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results = append(results, resp.Results...)
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fmt.Fprintf(out, "Processed %d references in total\n", total)
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if wasEmpty && masterPushed {
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// We need to tell the repo to reset the default branch to master
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extra := private.SetDefaultBranch(ctx, repoUser, repoName, "master")
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if extra.HasError() {
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return fail(ctx, extra.UserMsg, "SetDefaultBranch failed: %v", extra.Error)
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}
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}
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_ = dWriter.Close()
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hookPrintResults(results)
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return nil
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}
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func hookPrintResults(results []private.HookPostReceiveBranchResult) {
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for _, res := range results {
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if !res.Message {
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continue
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}
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fmt.Fprintln(os.Stderr, "")
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if res.Create {
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fmt.Fprintf(os.Stderr, "Create a new pull request for '%s':\n", res.Branch)
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fmt.Fprintf(os.Stderr, " %s\n", res.URL)
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} else {
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fmt.Fprint(os.Stderr, "Visit the existing pull request:\n")
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fmt.Fprintf(os.Stderr, " %s\n", res.URL)
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}
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fmt.Fprintln(os.Stderr, "")
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os.Stderr.Sync()
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}
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}
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func pushOptions() map[string]string {
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opts := make(map[string]string)
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if pushCount, err := strconv.Atoi(os.Getenv(private.GitPushOptionCount)); err == nil {
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for idx := 0; idx < pushCount; idx++ {
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opt := os.Getenv(fmt.Sprintf("GIT_PUSH_OPTION_%d", idx))
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kv := strings.SplitN(opt, "=", 2)
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if len(kv) == 2 {
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opts[kv[0]] = kv[1]
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}
|
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}
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}
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return opts
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}
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|
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func runHookProcReceive(c *cli.Context) error {
|
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ctx, cancel := installSignals()
|
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defer cancel()
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|
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setup(ctx, c.Bool("debug"))
|
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|
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if len(os.Getenv("SSH_ORIGINAL_COMMAND")) == 0 {
|
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if setting.OnlyAllowPushIfGiteaEnvironmentSet {
|
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return fail(ctx, `Rejecting changes as Forgejo environment not set.
|
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If you are pushing over SSH you must push with a key managed by
|
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Forgejo or set your environment appropriately.`, "")
|
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}
|
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return nil
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}
|
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|
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if git.CheckGitVersionAtLeast("2.29") != nil {
|
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return fail(ctx, "No proc-receive support", "current git version doesn't support proc-receive.")
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}
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|
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reader := bufio.NewReader(os.Stdin)
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repoUser := os.Getenv(repo_module.EnvRepoUsername)
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repoName := os.Getenv(repo_module.EnvRepoName)
|
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pusherID, _ := strconv.ParseInt(os.Getenv(repo_module.EnvPusherID), 10, 64)
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pusherName := os.Getenv(repo_module.EnvPusherName)
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// 1. Version and features negotiation.
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// S: PKT-LINE(version=1\0push-options atomic...) / PKT-LINE(version=1\n)
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// S: flush-pkt
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// H: PKT-LINE(version=1\0push-options...)
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// H: flush-pkt
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|
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rs, err := readPktLine(ctx, reader, pktLineTypeData)
|
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if err != nil {
|
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return err
|
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}
|
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|
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const VersionHead string = "version=1"
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|
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var (
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hasPushOptions bool
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response = []byte(VersionHead)
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requestOptions []string
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)
|
||
|
||
index := bytes.IndexByte(rs.Data, byte(0))
|
||
if index >= len(rs.Data) {
|
||
return fail(ctx, "Protocol: format error", "pkt-line: format error "+fmt.Sprint(rs.Data))
|
||
}
|
||
|
||
if index < 0 {
|
||
if len(rs.Data) == 10 && rs.Data[9] == '\n' {
|
||
index = 9
|
||
} else {
|
||
return fail(ctx, "Protocol: format error", "pkt-line: format error "+fmt.Sprint(rs.Data))
|
||
}
|
||
}
|
||
|
||
if string(rs.Data[0:index]) != VersionHead {
|
||
return fail(ctx, "Protocol: version error", "Received unsupported version: %s", string(rs.Data[0:index]))
|
||
}
|
||
requestOptions = strings.Split(string(rs.Data[index+1:]), " ")
|
||
|
||
for _, option := range requestOptions {
|
||
if strings.HasPrefix(option, "push-options") {
|
||
response = append(response, byte(0))
|
||
response = append(response, []byte("push-options")...)
|
||
hasPushOptions = true
|
||
}
|
||
}
|
||
response = append(response, '\n')
|
||
|
||
_, err = readPktLine(ctx, reader, pktLineTypeFlush)
|
||
if err != nil {
|
||
return err
|
||
}
|
||
|
||
err = writeDataPktLine(ctx, os.Stdout, response)
|
||
if err != nil {
|
||
return err
|
||
}
|
||
|
||
err = writeFlushPktLine(ctx, os.Stdout)
|
||
if err != nil {
|
||
return err
|
||
}
|
||
|
||
// 2. receive commands from server.
|
||
// S: PKT-LINE(<old-oid> <new-oid> <ref>)
|
||
// S: ... ...
|
||
// S: flush-pkt
|
||
// # [receive push-options]
|
||
// S: PKT-LINE(push-option)
|
||
// S: ... ...
|
||
// S: flush-pkt
|
||
hookOptions := private.HookOptions{
|
||
UserName: pusherName,
|
||
UserID: pusherID,
|
||
}
|
||
hookOptions.OldCommitIDs = make([]string, 0, hookBatchSize)
|
||
hookOptions.NewCommitIDs = make([]string, 0, hookBatchSize)
|
||
hookOptions.RefFullNames = make([]git.RefName, 0, hookBatchSize)
|
||
|
||
for {
|
||
// note: pktLineTypeUnknow means pktLineTypeFlush and pktLineTypeData all allowed
|
||
rs, err = readPktLine(ctx, reader, pktLineTypeUnknown)
|
||
if err != nil {
|
||
return err
|
||
}
|
||
|
||
if rs.Type == pktLineTypeFlush {
|
||
break
|
||
}
|
||
t := strings.SplitN(string(rs.Data), " ", 3)
|
||
if len(t) != 3 {
|
||
continue
|
||
}
|
||
hookOptions.OldCommitIDs = append(hookOptions.OldCommitIDs, t[0])
|
||
hookOptions.NewCommitIDs = append(hookOptions.NewCommitIDs, t[1])
|
||
hookOptions.RefFullNames = append(hookOptions.RefFullNames, git.RefName(t[2]))
|
||
}
|
||
|
||
hookOptions.GitPushOptions = make(map[string]string)
|
||
|
||
if hasPushOptions {
|
||
for {
|
||
rs, err = readPktLine(ctx, reader, pktLineTypeUnknown)
|
||
if err != nil {
|
||
return err
|
||
}
|
||
|
||
if rs.Type == pktLineTypeFlush {
|
||
break
|
||
}
|
||
|
||
kv := strings.SplitN(string(rs.Data), "=", 2)
|
||
if len(kv) == 2 {
|
||
hookOptions.GitPushOptions[kv[0]] = kv[1]
|
||
}
|
||
}
|
||
}
|
||
|
||
// 3. run hook
|
||
resp, extra := private.HookProcReceive(ctx, repoUser, repoName, hookOptions)
|
||
if extra.HasError() {
|
||
return fail(ctx, extra.UserMsg, "HookProcReceive failed: %v", extra.Error)
|
||
}
|
||
|
||
// 4. response result to service
|
||
// # a. OK, but has an alternate reference. The alternate reference name
|
||
// # and other status can be given in option directives.
|
||
// H: PKT-LINE(ok <ref>)
|
||
// H: PKT-LINE(option refname <refname>)
|
||
// H: PKT-LINE(option old-oid <old-oid>)
|
||
// H: PKT-LINE(option new-oid <new-oid>)
|
||
// H: PKT-LINE(option forced-update)
|
||
// H: ... ...
|
||
// H: flush-pkt
|
||
// # b. NO, I reject it.
|
||
// H: PKT-LINE(ng <ref> <reason>)
|
||
// # c. Fall through, let 'receive-pack' to execute it.
|
||
// H: PKT-LINE(ok <ref>)
|
||
// H: PKT-LINE(option fall-through)
|
||
|
||
for _, rs := range resp.Results {
|
||
if len(rs.Err) > 0 {
|
||
err = writeDataPktLine(ctx, os.Stdout, []byte("ng "+rs.OriginalRef.String()+" "+rs.Err))
|
||
if err != nil {
|
||
return err
|
||
}
|
||
continue
|
||
}
|
||
|
||
if rs.IsNotMatched {
|
||
err = writeDataPktLine(ctx, os.Stdout, []byte("ok "+rs.OriginalRef.String()))
|
||
if err != nil {
|
||
return err
|
||
}
|
||
err = writeDataPktLine(ctx, os.Stdout, []byte("option fall-through"))
|
||
if err != nil {
|
||
return err
|
||
}
|
||
continue
|
||
}
|
||
|
||
err = writeDataPktLine(ctx, os.Stdout, []byte("ok "+rs.OriginalRef))
|
||
if err != nil {
|
||
return err
|
||
}
|
||
err = writeDataPktLine(ctx, os.Stdout, []byte("option refname "+rs.Ref))
|
||
if err != nil {
|
||
return err
|
||
}
|
||
commitID, _ := git.NewIDFromString(rs.OldOID)
|
||
if !commitID.IsZero() {
|
||
err = writeDataPktLine(ctx, os.Stdout, []byte("option old-oid "+rs.OldOID))
|
||
if err != nil {
|
||
return err
|
||
}
|
||
}
|
||
err = writeDataPktLine(ctx, os.Stdout, []byte("option new-oid "+rs.NewOID))
|
||
if err != nil {
|
||
return err
|
||
}
|
||
if rs.IsForcePush {
|
||
err = writeDataPktLine(ctx, os.Stdout, []byte("option forced-update"))
|
||
if err != nil {
|
||
return err
|
||
}
|
||
}
|
||
}
|
||
err = writeFlushPktLine(ctx, os.Stdout)
|
||
|
||
return err
|
||
}
|
||
|
||
// git PKT-Line api
|
||
// pktLineType message type of pkt-line
|
||
type pktLineType int64
|
||
|
||
const (
|
||
// Unknown type
|
||
pktLineTypeUnknown pktLineType = 0
|
||
// flush-pkt "0000"
|
||
pktLineTypeFlush pktLineType = iota
|
||
// data line
|
||
pktLineTypeData
|
||
)
|
||
|
||
// gitPktLine pkt-line api
|
||
type gitPktLine struct {
|
||
Type pktLineType
|
||
Length uint64
|
||
Data []byte
|
||
}
|
||
|
||
// Reads an Pkt-Line from `in`. If requestType is not unknown, it will a
|
||
func readPktLine(ctx context.Context, in *bufio.Reader, requestType pktLineType) (*gitPktLine, error) {
|
||
// Read length prefix
|
||
lengthBytes := make([]byte, 4)
|
||
if n, err := in.Read(lengthBytes); n != 4 || err != nil {
|
||
return nil, fail(ctx, "Protocol: stdin error", "Pkt-Line: read stdin failed : %v", err)
|
||
}
|
||
|
||
var err error
|
||
r := &gitPktLine{}
|
||
r.Length, err = strconv.ParseUint(string(lengthBytes), 16, 32)
|
||
if err != nil {
|
||
return nil, fail(ctx, "Protocol: format parse error", "Pkt-Line format is wrong :%v", err)
|
||
}
|
||
|
||
if r.Length == 0 {
|
||
if requestType == pktLineTypeData {
|
||
return nil, fail(ctx, "Protocol: format data error", "Pkt-Line format is wrong")
|
||
}
|
||
r.Type = pktLineTypeFlush
|
||
return r, nil
|
||
}
|
||
|
||
if r.Length <= 4 || r.Length > 65520 || requestType == pktLineTypeFlush {
|
||
return nil, fail(ctx, "Protocol: format length error", "Pkt-Line format is wrong")
|
||
}
|
||
|
||
r.Data = make([]byte, r.Length-4)
|
||
if n, err := io.ReadFull(in, r.Data); uint64(n) != r.Length-4 || err != nil {
|
||
return nil, fail(ctx, "Protocol: stdin error", "Pkt-Line: read stdin failed : %v", err)
|
||
}
|
||
|
||
r.Type = pktLineTypeData
|
||
|
||
return r, nil
|
||
}
|
||
|
||
func writeFlushPktLine(ctx context.Context, out io.Writer) error {
|
||
l, err := out.Write([]byte("0000"))
|
||
if err != nil || l != 4 {
|
||
return fail(ctx, "Protocol: write error", "Pkt-Line response failed: %v", err)
|
||
}
|
||
return nil
|
||
}
|
||
|
||
// Write an Pkt-Line based on `data` to `out` according to the specifcation.
|
||
// https://git-scm.com/docs/protocol-common
|
||
func writeDataPktLine(ctx context.Context, out io.Writer, data []byte) error {
|
||
// Implementations SHOULD NOT send an empty pkt-line ("0004").
|
||
if len(data) == 0 {
|
||
return fail(ctx, "Protocol: write error", "Not allowed to write empty Pkt-Line")
|
||
}
|
||
|
||
length := uint64(len(data) + 4)
|
||
|
||
// The maximum length of a pkt-line’s data component is 65516 bytes.
|
||
// Implementations MUST NOT send pkt-line whose length exceeds 65520 (65516 bytes of payload + 4 bytes of length data).
|
||
if length > 65520 {
|
||
return fail(ctx, "Protocol: write error", "Pkt-Line exceeds maximum of 65520 bytes")
|
||
}
|
||
|
||
lr, err := fmt.Fprintf(out, "%04x", length)
|
||
if err != nil || lr != 4 {
|
||
return fail(ctx, "Protocol: write error", "Pkt-Line response failed: %v", err)
|
||
}
|
||
|
||
lr, err = out.Write(data)
|
||
if err != nil || int(length-4) != lr {
|
||
return fail(ctx, "Protocol: write error", "Pkt-Line response failed: %v", err)
|
||
}
|
||
|
||
return nil
|
||
}
|