2 goredo -- djb's redo implementation on pure Go
3 Copyright (C) 2020-2023 Sergey Matveev <stargrave@stargrave.org>
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation, version 3 of the License.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>.
41 "go.cypherpunks.ru/recfile"
42 "go.cypherpunks.ru/tai64n/v2"
43 "golang.org/x/sys/unix"
47 EnvDepFd = "REDO_DEP_FD"
48 EnvDirPrefix = "REDO_DIRPREFIX"
49 EnvDepCwd = "REDO_DEP_CWD"
50 EnvBuildUUID = "REDO_BUILD_UUID"
51 EnvStderrPrefix = "REDO_STDERR_PREFIX"
52 EnvTrace = "REDO_TRACE"
53 EnvStderrKeep = "REDO_LOGS"
54 EnvStderrSilent = "REDO_SILENT"
55 EnvNoSync = "REDO_NO_SYNC"
56 EnvStopIfMod = "REDO_STOP_IF_MODIFIED"
63 LogRecSuffix = ".log-rec"
77 flagStderrSilent *bool
78 flagForcedIfchange *bool
82 RunningProcs = map[int]*os.Process{}
83 RunningProcsM sync.Mutex
85 Err1WasTouched = errors.New("$1 was explicitly touched")
90 if !(cmdName == CmdNameRedo || cmdName == CmdNameRedoIfchange) {
93 flagTrace = flag.Bool("x", false, "trace (sh -x) current targets")
94 flagTraceAll = flag.Bool("xx", false,
95 fmt.Sprintf("trace (sh -x) all targets (%s=1)", EnvTrace))
96 flagStderrKeep = flag.Bool("k", false,
97 fmt.Sprintf("keep job's stderr (%s=1)", EnvStderrKeep))
98 flagStderrSilent = flag.Bool("s", false,
99 fmt.Sprintf("silent, do not print job's stderr (%s=1)", EnvStderrSilent))
100 flagForcedIfchange = flag.Bool("f", false, "forced redo-ifchange")
103 type RunError struct {
111 func (e *RunError) Name() string {
116 name = fmt.Sprintf("%s (%s)", e.Tgt, e.DoFile)
118 if e.Finished == nil {
121 return fmt.Sprintf("%s (%.3fs)", name, e.Finished.Sub(*e.Started).Seconds())
124 func (e RunError) Error() string {
125 return fmt.Sprintf("%s: %s", e.Name(), e.Err)
128 func mkdirs(pth string) error {
132 return os.MkdirAll(pth, os.FileMode(0777))
135 func isModified(cwd, redoDir, tgt string) (bool, *Inode, string, error) {
136 fdDep, err := os.Open(path.Join(redoDir, tgt+DepSuffix))
138 if os.IsNotExist(err) {
139 return false, nil, "", nil
141 return false, nil, "", err
144 r := recfile.NewReader(fdDep)
149 m, err := r.NextMap()
151 if errors.Is(err, io.EOF) {
154 return false, nil, "", err
156 if m["Type"] != DepTypeIfchange || m["Target"] != tgt {
159 ourInode, err = inodeFromFileByPath(path.Join(cwd, tgt))
161 if os.IsNotExist(err) {
162 return false, nil, "", nil
164 return false, nil, "", err
166 theirInode, err := inodeFromRec(m)
168 return false, nil, "", err
171 modified = !ourInode.Equals(theirInode)
174 return modified, ourInode, hshPrev, nil
177 func syncDir(dir string) error {
178 fd, err := os.Open(dir)
187 func runScript(tgtOrig string, errs chan error, traced bool) error {
188 cwd, tgt := cwdAndTgt(tgtOrig)
189 redoDir := path.Join(cwd, RedoDir)
190 if err := mkdirs(redoDir); err != nil {
191 return TgtError{tgtOrig, err}
194 shCtx := fmt.Sprintf("sh: %s: cwd:%s", tgtOrig, cwd)
195 jsToken := jsAcquire(shCtx)
196 jsNeedsRelease := true
199 jsRelease(shCtx, jsToken)
204 fdLock, err := os.OpenFile(
205 path.Join(redoDir, tgt+LockSuffix),
206 os.O_WRONLY|os.O_TRUNC|os.O_CREATE,
210 return TgtError{tgtOrig, err}
212 flock := unix.Flock_t{
214 Whence: io.SeekStart,
216 lockRelease := func() {
217 tracef(CLock, "LOCK_UN: %s", fdLock.Name())
218 flock.Type = unix.F_UNLCK
219 if err := unix.FcntlFlock(fdLock.Fd(), unix.F_SETLK, &flock); err != nil {
220 log.Fatalln(err, fdLock.Name())
224 tracef(CLock, "LOCK_NB: %s", fdLock.Name())
226 // Waiting for job completion, already taken by someone else
227 if err = unix.FcntlFlock(fdLock.Fd(), unix.F_SETLK, &flock); err != nil {
228 if uintptr(err.(syscall.Errno)) != uintptr(unix.EAGAIN) {
230 return TgtError{tgtOrig, err}
233 if err = unix.FcntlFlock(fdLock.Fd(), unix.F_GETLK, &flock); err != nil {
234 log.Fatalln(err, fdLock.Name())
236 tracef(CDebug, "waiting: %s (pid=%d)", tgtOrig, flock.Pid)
238 if _, err = FdStatus.Write([]byte{StatusWait}); err != nil {
244 tracef(CLock, "LOCK_EX: %s", fdLock.Name())
246 if err := unix.FcntlFlock(fdLock.Fd(), unix.F_SETLKW, &flock); err != nil {
247 log.Println(err, fdLock.Name())
248 time.Sleep(10 * time.Millisecond)
252 tracef(CDebug, "waiting done: %s", tgtOrig)
254 if _, err = FdStatus.Write([]byte{StatusWaited}); err != nil {
259 fdDep, err := os.Open(path.Join(redoDir, tgt+DepSuffix))
261 if os.IsNotExist(err) {
262 err = errors.New("was not built: no .rec")
267 depInfo, err = depRead(fdDep)
271 if depInfo.build != BuildUUID {
272 err = errors.New("was not built: build differs")
276 err = TgtError{tgtOrig, err}
284 // Check if target is not modified externally
285 modified, inodePrev, hshPrev, err := isModified(cwd, redoDir, tgt)
288 return TgtError{tgtOrig, err}
293 return fmt.Errorf("%s externally modified", tgtOrig)
295 tracef(CWarn, "%s externally modified: not redoing", tgtOrig)
302 // Start preparing .rec
303 fdDep, err := tempfile(redoDir, tgt+DepSuffix)
306 return TgtError{tgtOrig, err}
308 fdDepPath := fdDep.Name()
312 os.Remove(fdDep.Name())
314 if _, err = recfile.NewWriter(fdDep).WriteFields(
315 recfile.Field{Name: "Build", Value: BuildUUID},
318 return TgtError{tgtOrig, err}
322 doFile, upLevels, err := findDo(fdDep, cwd, tgt)
325 return TgtError{tgtOrig, err}
329 return TgtError{tgtOrig, errors.New("no .do found")}
332 // Determine basename and DIRPREFIX
333 doFileRelPath := doFile
334 ents := strings.Split(cwd, "/")
335 ents = ents[len(ents)-upLevels:]
336 dirPrefix := path.Join(ents...)
338 for i := 0; i < upLevels; i++ {
339 cwd = path.Join(cwd, "..")
340 doFileRelPath = path.Join("..", doFileRelPath)
342 cwd = path.Clean(cwd)
343 doFilePath := path.Join(cwd, doFile)
345 runErr := RunError{Tgt: tgtOrig}
346 if strings.HasPrefix(doFile, "default.") {
347 basename = tgt[:len(tgt)-(len(doFile)-len("default.")-len(".do"))-1]
348 runErr.DoFile = doFileRelPath
351 if err = depWrite(fdDep, cwdOrig, doFileRelPath, ""); err != nil {
353 return TgtError{tgtOrig, err}
356 tracef(CWait, "%s", runErr.Name())
358 // Prepare command line
361 if err = unix.Access(doFilePath, unix.X_OK); err == nil {
363 args = make([]string, 0, 3)
366 if traced || TracedAll {
367 args = append(args, "-ex")
369 args = append(args, "-e")
371 args = append(args, doFile)
374 // Temporary file for stdout
375 fdStdout, err := tempfile(cwdOrig, tgt)
378 return TgtError{tgtOrig, err}
380 stdoutPath := fdStdout.Name()
382 tmpPath := stdoutPath + ".3" // and for $3
383 tmpPathRel, err := filepath.Rel(cwd, tmpPath)
389 path.Join(dirPrefix, tgt),
390 path.Join(dirPrefix, basename),
394 "sh: %s: %s %s cwd:%s dirprefix:%s",
395 tgtOrig, cmdName, args, cwd, dirPrefix,
398 cmd := exec.Command(cmdName, args...)
400 // cmd.Stdin reads from /dev/null by default
401 cmd.Env = append(os.Environ(), fmt.Sprintf("%s=%d", EnvLevel, Level+1))
402 cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%s", EnvDirPrefix, dirPrefix))
403 cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%s", EnvBuildUUID, BuildUUID))
405 childStderrPrefixRaw := make([]byte, 8)
406 if _, err = io.ReadFull(rand.Reader, childStderrPrefixRaw); err != nil {
409 childStderrPrefix := hex.EncodeToString(childStderrPrefixRaw)
410 cmd.Env = append(cmd.Env, fmt.Sprintf(
411 "%s=%s", EnvStderrPrefix, childStderrPrefix,
415 cmd.ExtraFiles = append(cmd.ExtraFiles, FdOODTgts)
416 cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%d", EnvOODTgtsFd, 3+fdNum))
418 cmd.ExtraFiles = append(cmd.ExtraFiles, FdOODTgtsLock)
419 cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%d", EnvOODTgtsLockFd, 3+fdNum))
423 cmd.Env = append(cmd.Env, fmt.Sprintf("%s=NO", EnvStatusFd))
425 cmd.ExtraFiles = append(cmd.ExtraFiles, FdStatus)
426 cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%d", EnvStatusFd, 3+fdNum))
431 var fdStderr *os.File
433 fdStderr, err = os.OpenFile(
434 path.Join(redoDir, tgt+LogSuffix),
435 os.O_WRONLY|os.O_CREATE|os.O_TRUNC,
440 return TgtError{tgtOrig, err}
443 tracef(CDebug, "%s", shCtx)
445 jsNeedsRelease = false
450 cmd.Env = append(cmd.Env, fmt.Sprintf("%s=NO", EnvJobs))
452 cmd.ExtraFiles = append(cmd.ExtraFiles, JSR)
453 cmd.ExtraFiles = append(cmd.ExtraFiles, JSW)
454 makeFlags := fmt.Sprintf(
455 "%s %s%d,%d", MakeFlags, MakeJSArg, 3+fdNum+0, 3+fdNum+1,
457 makeFlags = strings.Trim(makeFlags, " ")
458 cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%s", MakeFlagsName, makeFlags))
460 cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%d", EnvJSToken, jsToken))
464 if _, err = FdStatus.Write([]byte{StatusRun}); err != nil {
469 defer jsRelease(shCtx, jsToken)
471 var finished time.Time
472 var exitErr *exec.ExitError
473 started := time.Now()
474 runErr.Started = &started
475 fdStdout, err = os.OpenFile(stdoutPath, os.O_RDWR, os.FileMode(0666))
484 cmd.Stdout = fdStdout
485 fdDep, err = os.OpenFile(fdDepPath, os.O_WRONLY|os.O_APPEND, os.FileMode(0666))
495 cmd.ExtraFiles = append(cmd.ExtraFiles, fdDep)
496 cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%d", EnvDepFd, 3+fdNum))
498 cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%s", EnvDepCwd, cwd))
505 logRecPath := path.Join(redoDir, tgt+LogRecSuffix)
506 if fdStderr, err = os.OpenFile(
508 os.O_WRONLY|os.O_CREATE|os.O_TRUNC,
511 fields := []recfile.Field{
512 {Name: "Build", Value: BuildUUID},
513 {Name: "PPID", Value: strconv.Itoa(os.Getpid())},
514 {Name: "Cwd", Value: cwd},
516 if cmd.Process != nil {
517 fields = append(fields, recfile.Field{
518 Name: "PID", Value: strconv.Itoa(cmd.Process.Pid),
521 ts := new(tai64n.TAI64N)
523 fields = append(fields,
524 recfile.Field{Name: "Started", Value: tai64n.Encode(ts[:])},
526 ts.FromTime(finished)
527 fields = append(fields,
528 recfile.Field{Name: "Finished", Value: tai64n.Encode(ts[:])})
529 fields = append(fields, recfile.Field{
531 Value: strconv.FormatInt(finished.Sub(started).Nanoseconds(), 10),
533 fields = append(fields, recfile.Field{Name: "Cmd", Value: cmdName})
534 for _, arg := range args {
535 fields = append(fields, recfile.Field{Name: "Arg", Value: arg})
537 for _, env := range cmd.Env {
538 fields = append(fields, recfile.Field{Name: "Env", Value: env})
541 fields = append(fields, recfile.Field{
543 Value: strconv.Itoa(exitErr.ProcessState.ExitCode()),
546 w := bufio.NewWriter(fdStderr)
549 fdDep, err := os.Open(fdDepPath)
553 depInfo, err = depRead(fdDep)
558 for _, dep := range depInfo.ifchanges {
559 fields = append(fields, recfile.Field{
561 Value: dep["Target"],
564 _, err = recfile.NewWriter(w).WriteFields(fields...)
572 os.Remove(logRecPath)
576 log.Println("can not open", logRecPath, ":", err)
580 os.Remove(fdDep.Name())
581 os.Remove(fdStdout.Name())
584 if _, err = FdStatus.Write([]byte{StatusDone}); err != nil {
590 stderr, err := cmd.StderrPipe()
604 RunningProcs[cmd.Process.Pid] = cmd.Process
605 RunningProcsM.Unlock()
606 pid := fmt.Sprintf("[%d]", cmd.Process.Pid)
607 tracef(CDebug, "%s runs %s", tgtOrig, pid)
609 stderrTerm := make(chan struct{})
611 scanner := bufio.NewScanner(stderr)
613 ts := new(tai64n.TAI64N)
615 line = scanner.Text()
616 if strings.HasPrefix(line, childStderrPrefix) {
617 line = line[len(childStderrPrefix):]
618 os.Stderr.WriteString(StderrPrefix + line + "\n")
622 ts.FromTime(time.Now())
624 fmt.Fprintln(fdStderr, tai64n.Encode(ts[:]), line)
631 tracef(CNone, "%s", line)
633 tracef(CNone, "%s %s", pid, line)
639 // Wait for job completion
643 delete(RunningProcs, cmd.Process.Pid)
644 RunningProcsM.Unlock()
645 finished = time.Now()
646 runErr.Finished = &finished
648 exitErr = err.(*exec.ExitError)
655 if inode, err := inodeFromFileByPath(path.Join(cwdOrig, tgt)); err == nil {
656 if inodePrev == nil {
657 runErr.Err = Err1WasTouched
666 if !inode.Equals(inodePrev) {
667 runErr.Err = Err1WasTouched
673 if inodePrev != nil {
674 if inode, err := inodeFromFileByPath(path.Join(cwdOrig, tgt)); err == nil {
675 if !inode.Equals(inodePrev) {
676 runErr.Err = Err1WasTouched
683 // Does it produce both stdout and tmp?
684 fiStdout, err := os.Stat(fdStdout.Name())
691 _, err = os.Stat(tmpPath)
693 if fiStdout.Size() > 0 {
694 runErr.Err = errors.New("created both tmp and stdout")
699 } else if !os.IsNotExist(err) {
705 // Determine what file we must process at last
708 fd, err = os.Open(tmpPath)
713 } else if fiStdout.Size() > 0 {
717 // Do we need to ifcreate it, or ifchange with renaming?
719 os.Remove(path.Join(cwdOrig, tgt))
720 err = ifcreate(fdDep, tgt)
727 _, err = fd.Seek(0, io.SeekStart)
731 hsh, err = fileHash(fd)
736 tracef(CDebug, "%s has same hash, not renaming", tgtOrig)
737 err = os.Remove(fd.Name())
741 err = os.Chtimes(path.Join(cwdOrig, tgt), finished, finished)
746 err = syncDir(cwdOrig)
751 err = depWrite(fdDep, cwdOrig, tgt, hshPrev)
764 err = os.Rename(fd.Name(), path.Join(cwdOrig, tgt))
769 err = syncDir(cwdOrig)
774 err = depWrite(fdDep, cwdOrig, tgt, hsh)
788 fdDepPath = path.Join(redoDir, tgt+DepSuffix)
789 err = os.Rename(fdDep.Name(), fdDepPath)
794 err = syncDir(redoDir)
800 // Post-commit .rec sanitizing
802 if fdDepR, err := os.Open(fdDepPath); err == nil {
803 depInfo, err := depRead(fdDepR)
808 ifchangeSeen := make(map[string]struct{}, len(depInfo.ifchanges))
809 for _, dep := range depInfo.ifchanges {
810 ifchangeSeen[dep["Target"]] = struct{}{}
812 for _, dep := range depInfo.ifcreates {
813 if _, exists := ifchangeSeen[dep]; exists {
814 tracef(CWarn, "simultaneous ifcreate and ifchange records: %s", tgt)
826 func isOkRun(err error) bool {
831 if errors.As(err, &runErr) && runErr.Err == nil {
832 tracef(CRedo, "%s", runErr.Name())
835 tracef(CErr, "%s", err)