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|
package forge
import (
"bufio"
"errors"
"fmt"
"io"
"os"
"path/filepath"
"strconv"
"strings"
)
const (
maxPkt = 65520
maxCommands = 64
maxOptions = 64
maxTopic = 100
)
var zeroOID = strings.Repeat("0", 40)
func hooksDir(root string) string { return filepath.Join(root, "hooks") }
func shellQuote(s string) string { return "'" + strings.ReplaceAll(s, "'", `'\''`) + "'" }
func hookScript(root, host, binary, kind string) string {
return fmt.Sprintf("#!/bin/sh\nGITPOCKET_HOST=%s exec %s -root %s hook %s\n", shellQuote(host), shellQuote(binary), shellQuote(root), kind)
}
func writeHook(path, script string) error {
if b, err := os.ReadFile(path); err == nil && string(b) == script {
return os.Chmod(path, 0o755)
}
tmp := path + ".tmp"
if err := os.WriteFile(tmp, []byte(script), 0o755); err != nil {
return err
}
return os.Rename(tmp, path)
}
func installCentralHooks(root, host string) error {
binary, err := os.Executable()
if err != nil {
return err
}
dir := hooksDir(root)
if err := os.MkdirAll(dir, 0o755); err != nil {
return err
}
for _, kind := range []string{"pre-receive", "proc-receive"} {
if err := writeHook(filepath.Join(dir, kind), hookScript(root, host, binary, kind)); err != nil {
return err
}
}
return nil
}
func hooksReady(root string) bool {
for _, kind := range []string{"pre-receive", "proc-receive"} {
fi, err := os.Stat(filepath.Join(hooksDir(root), kind))
if err != nil || !fi.Mode().IsRegular() || fi.Mode()&0o111 == 0 {
return false
}
}
return true
}
func receiveArgs(root string) []string {
return []string{"-c", "core.hooksPath=" + hooksDir(root), "-c", "receive.procReceiveRefs=refs/for", "-c", "receive.advertisePushOptions=true"}
}
func receiveEnv(repo Repo, pusher User) []string {
return []string{"GITPOCKET_REPO=" + repo.Owner.Name + "/" + repo.Name, "GITPOCKET_PUSHER=" + strconv.FormatInt(pusher.ID, 10)}
}
type hookContext struct {
store *Store
repo Repo
pusher User
writer bool
g Git
}
func loadHook(root string, readonly bool) (hookContext, error) {
path := os.Getenv("GITPOCKET_REPO")
id, err := strconv.ParseInt(os.Getenv("GITPOCKET_PUSHER"), 10, 64)
owner, name, ok := strings.Cut(path, "/")
if !ok || err != nil || id <= 0 {
return hookContext{}, errors.New("push did not come through gitpocket")
}
store, err := openStore(filepath.Join(root, "gitpocket.db"), readonly)
if err != nil {
return hookContext{}, errors.New("database unavailable")
}
repo, err := store.RepoByPath(owner, name)
if err != nil {
return hookContext{}, errors.New("unknown repository")
}
pusher, err := store.userByID(id)
if err != nil || store.IsBanned(id) {
return hookContext{}, errors.New("unknown account")
}
if !store.CanRead(repo, &pusher) {
return hookContext{}, errors.New("unknown repository")
}
return hookContext{store: store, repo: repo, pusher: pusher, writer: store.CanWrite(repo, &pusher), g: Git{Dir: filepath.Join(root, "repos", repo.Owner.Name, repo.Name+".git")}}, nil
}
func hook(root, kind string) int {
switch kind {
case "pre-receive":
return preReceive(root, os.Stdin, os.Stderr)
case "proc-receive":
return procReceive(root, os.Stdin, os.Stdout, os.Stderr)
}
return 0
}
func preReceive(root string, in io.Reader, errw io.Writer) int {
refuse := func(format string, args ...any) int {
fmt.Fprintf(errw, "gitpocket: "+format+"\n", args...)
return 1
}
hc, err := loadHook(root, true)
if err != nil {
return refuse("%v, push refused", err)
}
for _, kv := range os.Environ() {
if strings.HasPrefix(kv, "GIT_OBJECT_DIRECTORY=") || strings.HasPrefix(kv, "GIT_ALTERNATE_OBJECT_DIRECTORIES=") || strings.HasPrefix(kv, "GIT_QUARANTINE_PATH=") {
passEnv = append(passEnv, kv)
}
}
mirror := hc.store.IsPullMirror(hc.repo.ID)
if !hc.writer && (!hc.store.GuestPushBudget(hc.pusher.ID) || hc.store.Blocked(hc.repo.Owner.ID, hc.pusher.ID) || hc.repo.Archived || mirror) {
return refuse("you cannot open pull requests here right now")
}
scanner := bufio.NewScanner(in)
for scanner.Scan() {
f := strings.Fields(scanner.Text())
if len(f) != 3 {
return refuse("malformed update")
}
ref := f[2]
if strings.HasPrefix(ref, "refs/for/") {
continue
}
if !hc.writer {
return refuse("you can only open pull requests here, push to refs/for/<branch>")
}
if mirror {
return refuse("%s is a pull mirror and read only", hc.repo.Path())
}
if !strings.HasPrefix(ref, "refs/heads/") && !strings.HasPrefix(ref, "refs/tags/") {
return refuse("only branches and tags can be pushed, not %s", ref)
}
branch, ok := strings.CutPrefix(ref, "refs/heads/")
if !ok {
continue
}
prot, ok := hc.store.Protection(hc.repo.ID, branch)
if !ok {
continue
}
if f[1] == zeroOID {
return refuse("%s is protected and cannot be deleted", branch)
}
if prot.RequirePR && f[0] != zeroOID {
return refuse("%s only accepts changes through pull requests", branch)
}
if f[0] != zeroOID {
if _, err := hc.g.run(nil, "merge-base", "--is-ancestor", f[0], f[1]); err != nil {
return refuse("%s is protected, force pushes are refused", branch)
}
}
}
return 0
}
type pktReader struct{ r *bufio.Reader }
func (p pktReader) read() (string, bool, error) {
var head [4]byte
if _, err := io.ReadFull(p.r, head[:]); err != nil {
return "", false, err
}
n, err := strconv.ParseUint(string(head[:]), 16, 16)
if err != nil {
return "", false, errors.New("bad pkt-line length")
}
if n == 0 {
return "", true, nil
}
if n < 4 || n > maxPkt {
return "", false, errors.New("bad pkt-line length")
}
buf := make([]byte, n-4)
if _, err := io.ReadFull(p.r, buf); err != nil {
return "", false, err
}
return strings.TrimSuffix(string(buf), "\n"), false, nil
}
func (p pktReader) section(limit int) ([]string, error) {
var out []string
for {
line, flush, err := p.read()
if err != nil {
return nil, err
}
if flush {
return out, nil
}
if len(out) >= limit {
return nil, errors.New("too many lines")
}
out = append(out, line)
}
}
func writePkt(w io.Writer, line string) error {
if line == "" {
_, err := io.WriteString(w, "0000")
return err
}
_, err := fmt.Fprintf(w, "%04x%s\n", len(line)+5, line)
return err
}
type agitCommand struct{ old, new, ref string }
type agitResult struct {
ok bool
reason string
ref, oldOID string
newOID string
}
func procReceive(root string, in io.Reader, out, errw io.Writer) int {
pr := pktReader{bufio.NewReader(in)}
hello, err := pr.section(4)
if err != nil || len(hello) == 0 {
return 1
}
version, caps, _ := strings.Cut(hello[0], "\x00")
if version != "version=1" {
return 1
}
options := false
for _, c := range strings.Fields(caps) {
options = options || c == "push-options"
}
reply := "version=1"
if options {
reply += "\x00push-options"
}
if writePkt(out, reply) != nil || writePkt(out, "") != nil {
return 1
}
lines, err := pr.section(maxCommands)
if err != nil {
return 1
}
var cmds []agitCommand
for _, line := range lines {
f := strings.Fields(line)
if len(f) != 3 {
return 1
}
cmds = append(cmds, agitCommand{f[0], f[1], f[2]})
}
opts := map[string]string{}
if options {
raw, err := pr.section(maxOptions)
if err != nil {
return 1
}
for _, o := range raw {
k, v, _ := strings.Cut(o, "=")
opts[k] = v
}
}
hc, herr := loadHook(root, false)
if herr == nil && !hc.writer {
hc.store.GuestPushed(hc.pusher.ID)
}
for _, c := range cmds {
var res agitResult
if herr != nil {
res = agitResult{reason: herr.Error()}
} else {
res = hc.agit(c, opts, errw)
}
res.ref = c.ref
if !res.ok {
writePkt(out, "ng "+c.ref+" "+sanitizeReason(res.reason))
continue
}
writePkt(out, "ok "+c.ref)
writePkt(out, "option refname "+res.ref)
writePkt(out, "option old-oid "+res.oldOID)
writePkt(out, "option new-oid "+res.newOID)
}
writePkt(out, "")
return 0
}
func sanitizeReason(s string) string {
s = strings.Map(func(r rune) rune {
if r < 0x20 || r == 0x7f {
return ' '
}
return r
}, s)
if len(s) > 200 {
s = s[:200]
}
return s
}
func validOID(s string) bool {
if len(s) != 40 && len(s) != 64 {
return false
}
for _, c := range s {
if (c < '0' || c > '9') && (c < 'a' || c > 'f') {
return false
}
}
return true
}
func (hc hookContext) agitTarget(rest, option string) (target, topic string, ok bool) {
parts := strings.Split(rest, "/")
for i := len(parts); i > 0; i-- {
branch := strings.Join(parts[:i], "/")
if !validBranch(branch) {
continue
}
if _, err := hc.g.Resolve("refs/heads/" + branch); err != nil {
continue
}
topic = strings.Join(parts[i:], "/")
if topic == "" {
topic = option
}
if topic == "" {
topic = branch
}
return branch, topic, validBranch(topic) && len(topic) <= maxTopic
}
return "", "", false
}
func (hc hookContext) agit(c agitCommand, opts map[string]string, errw io.Writer) agitResult {
fail := func(msg string) agitResult { return agitResult{reason: msg} }
switch {
case !validOID(c.new) || !validOID(c.old):
return fail("malformed update")
case c.new == zeroOID || strings.Trim(c.new, "0") == "":
return fail("pull requests cannot be deleted by push")
case hc.repo.Archived:
return fail("repository is archived")
case hc.store.IsPullMirror(hc.repo.ID):
return fail("repository is a pull mirror")
case hc.store.Blocked(hc.repo.Owner.ID, hc.pusher.ID):
return fail("you cannot open pull requests here")
}
rest, _ := strings.CutPrefix(c.ref, "refs/for/")
target, topic, ok := hc.agitTarget(rest, strings.TrimSpace(opts["topic"]))
if !ok {
return fail("push to refs/for/<existing branch>[/<topic>]")
}
if t, err := hc.g.run(nil, "cat-file", "-t", c.new); err != nil || strings.TrimSpace(string(t)) != "commit" {
return fail("not a commit")
}
if _, err := hc.g.run(nil, "merge-base", "--is-ancestor", c.new, "refs/heads/"+target); err == nil {
return fail("no new commits compared to " + target)
}
if pull, found := hc.store.AgitPull(hc.repo, hc.pusher.ID, target, topic); found {
old, _ := hc.g.Resolve(pull.Ref())
if old == c.new {
return fail("pull request is already up to date")
}
if _, err := hc.g.run(nil, "update-ref", pull.Ref(), c.new, old); err != nil {
return fail("pull request moved, push again")
}
hc.g.RecordRevision(pull)
hc.store.TouchPull(pull.ID)
hc.store.Notify(hc.store.Watchers(hc.repo, "pull", pull.ID, pull.Author.ID), hc.pusher, hc.repo, "pull", pull.Number, pull.Title, "updated")
fmt.Fprintf(errw, "\nupdated pull request #%d:\n %s\n\n", pull.Number, pullURL(hc.repo, pull.Number))
return agitResult{ok: true, ref: pull.Ref(), oldOID: old, newOID: c.new}
}
if !hc.store.ThreadBudget(hc.pusher.ID) {
return fail("too many new issues and pull requests, try again later")
}
title, body := strings.TrimSpace(opts["title"]), strings.TrimSpace(opts["description"])
if title == "" {
msg, _ := hc.g.run(nil, "log", "-1", "--format=%B", c.new)
subject, rest, _ := strings.Cut(strings.TrimSpace(string(msg)), "\n")
title = strings.TrimSpace(subject)
if body == "" {
body = strings.TrimSpace(rest)
}
}
if len(title) > 200 {
title = title[:200]
}
if len(body) > 20000 {
body = body[:20000]
}
pull, err := hc.store.CreatePull(hc.repo, hc.pusher, title, body, hc.repo, "", target)
if err != nil {
return fail(err.Error())
}
hc.store.SetAgit(pull.ID, topic)
pull.Agit = topic
if _, err := hc.g.run(nil, "update-ref", pull.Ref(), c.new); err != nil {
hc.store.DeletePull(pull.ID)
return fail("could not record the pull request")
}
if opts["draft"] == "true" || opts["draft"] == "1" {
hc.store.SetDraft(pull.ID, true)
}
hc.g.RecordRevision(pull)
hc.store.Notify(hc.store.Watchers(hc.repo, "pull", pull.ID, pull.Author.ID), hc.pusher, hc.repo, "pull", pull.Number, pull.Title, "opened")
fmt.Fprintf(errw, "\ncreated pull request #%d:\n %s\n\n", pull.Number, pullURL(hc.repo, pull.Number))
return agitResult{ok: true, ref: pull.Ref(), oldOID: zeroOID, newOID: c.new}
}
func pullURL(repo Repo, n int64) string {
host := os.Getenv("GITPOCKET_HOST")
if host == "" {
return fmt.Sprintf("/%s/pulls/%d", repo.Path(), n)
}
return fmt.Sprintf("https://%s/%s/pulls/%d", host, repo.Path(), n)
}
func (s *Store) AgitPull(repo Repo, author int64, target, topic string) (Pull, bool) {
var number int64
err := s.db.QueryRow(`select number from pulls where repo = ? and author = ? and agit = ? and target_branch = ? and state = 'open' order by number desc limit 1`, repo.ID, author, topic, target).Scan(&number)
if err != nil {
return Pull{}, false
}
p, err := s.Pull(repo, number)
return p, err == nil
}
func (s *Store) SetAgit(id int64, topic string) {
s.db.Exec(`update pulls set agit = ? where id = ?`, topic, id)
}
func (s *Store) DeletePull(id int64) {
s.db.Exec(`delete from pulls where id = ?`, id)
}
|