run.go

   1 /*
   2 goredo -- djb's redo implementation on pure Go
   3 Copyright (C) 2020-2022 Sergey Matveev <stargrave@stargrave.org>
   4
   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.
   8
   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.
  13
  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/>.
  16 */
  17
  18 // Targets runner
  19
  20 package main
  21
  22 import (
  23         "bufio"
  24         "errors"
  25         "flag"
  26         "fmt"
  27         "io"
  28         "log"
  29         "os"
  30         "os/exec"
  31         "path"
  32         "path/filepath"
  33         "strconv"
  34         "strings"
  35         "sync"
  36         "syscall"
  37         "time"
  38
  39         "go.cypherpunks.ru/recfile"
  40         "go.cypherpunks.ru/tai64n/v2"
  41         "golang.org/x/sys/unix"
  42 )
  43
  44 const (
  45         EnvDepFd        = "REDO_DEP_FD"
  46         EnvDirPrefix    = "REDO_DIRPREFIX"
  47         EnvDepCwd       = "REDO_DEP_CWD"
  48         EnvBuildUUID    = "REDO_BUILD_UUID"
  49         EnvStderrPrefix = "REDO_STDERR_PREFIX"
  50         EnvTrace        = "REDO_TRACE"
  51         EnvStderrKeep   = "REDO_LOGS"
  52         EnvStderrSilent = "REDO_SILENT"
  53         EnvNoSync       = "REDO_NO_SYNC"
  54         EnvStopIfMod    = "REDO_STOP_IF_MODIFIED"
  55
  56         RedoDir      = ".redo"
  57         LockSuffix   = ".lock"
  58         DepSuffix    = ".rec"
  59         TmpPrefix    = ".redo."
  60         LogSuffix    = ".log"
  61         LogRecSuffix = ".log-rec"
  62 )
  63
  64 var (
  65         NoSync       = false
  66         StderrKeep   = false
  67         StderrSilent = false
  68         StderrPrefix string
  69         StopIfMod    = false
  70         Jobs         sync.WaitGroup
  71
  72         flagTrace        *bool
  73         flagTraceAll     *bool
  74         flagStderrKeep   *bool
  75         flagStderrSilent *bool
  76
  77         TracedAll bool
  78
  79         RunningProcs  = map[int]*os.Process{}
  80         RunningProcsM sync.Mutex
  81
  82         Err1WasTouched = errors.New("$1 was explicitly touched")
  83 )
  84
  85 func init() {
  86         cmdName := CmdName()
  87         if !(cmdName == CmdNameRedo || cmdName == CmdNameRedoIfchange) {
  88                 return
  89         }
  90         flagTrace = flag.Bool("x", false, "trace (sh -x) current targets")
  91         flagTraceAll = flag.Bool("xx", false,
  92                 fmt.Sprintf("trace (sh -x) all targets (%s=1)", EnvTrace))
  93         flagStderrKeep = flag.Bool("k", false,
  94                 fmt.Sprintf("keep job's stderr (%s=1)", EnvStderrKeep))
  95         flagStderrSilent = flag.Bool("s", false,
  96                 fmt.Sprintf("silent, do not print job's stderr (%s=1)", EnvStderrSilent))
  97 }
  98
  99 type RunError struct {
 100         Tgt      string
 101         DoFile   string
 102         Started  *time.Time
 103         Finished *time.Time
 104         Err      error
 105 }
 106
 107 func (e *RunError) Name() string {
 108         var name string
 109         if e.DoFile == "" {
 110                 name = e.Tgt
 111         } else {
 112                 name = fmt.Sprintf("%s (%s)", e.Tgt, e.DoFile)
 113         }
 114         if e.Finished == nil {
 115                 return name
 116         }
 117         return fmt.Sprintf("%s (%.3fs)", name, e.Finished.Sub(*e.Started).Seconds())
 118 }
 119
 120 func (e RunError) Error() string {
 121         return fmt.Sprintf("%s: %s", e.Name(), e.Err)
 122 }
 123
 124 func mkdirs(pth string) error {
 125         if _, err := os.Stat(pth); err == nil {
 126                 return nil
 127         }
 128         return os.MkdirAll(pth, os.FileMode(0777))
 129 }
 130
 131 func isModified(cwd, redoDir, tgt string) (bool, *Inode, error) {
 132         fdDep, err := os.Open(path.Join(redoDir, tgt+DepSuffix))
 133         if err != nil {
 134                 if os.IsNotExist(err) {
 135                         return false, nil, nil
 136                 }
 137                 return false, nil, err
 138         }
 139         defer fdDep.Close()
 140         r := recfile.NewReader(fdDep)
 141         var ourInode *Inode
 142         for {
 143                 m, err := r.NextMap()
 144                 if err != nil {
 145                         if errors.Is(err, io.EOF) {
 146                                 break
 147                         }
 148                         return false, nil, err
 149                 }
 150                 if m["Type"] != DepTypeIfchange || m["Target"] != tgt {
 151                         continue
 152                 }
 153                 fd, err := os.Open(path.Join(cwd, tgt))
 154                 if err != nil {
 155                         if os.IsNotExist(err) {
 156                                 return false, nil, nil
 157                         }
 158                         return false, nil, err
 159                 }
 160                 ourInode, err = inodeFromFile(fd)
 161                 fd.Close()
 162                 if err != nil {
 163                         return false, nil, err
 164                 }
 165                 theirInode, err := inodeFromRec(m)
 166                 if err != nil {
 167                         return false, nil, err
 168                 }
 169                 if !ourInode.Equals(theirInode) {
 170                         return true, ourInode, nil
 171                 }
 172                 break
 173         }
 174         return false, ourInode, nil
 175 }
 176
 177 func syncDir(dir string) error {
 178         fd, err := os.Open(dir)
 179         if err != nil {
 180                 return err
 181         }
 182         err = fd.Sync()
 183         fd.Close()
 184         return err
 185 }
 186
 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}
 192         }
 193
 194         // Acquire lock
 195         fdLock, err := os.OpenFile(
 196                 path.Join(redoDir, tgt+LockSuffix),
 197                 os.O_WRONLY|os.O_TRUNC|os.O_CREATE,
 198                 os.FileMode(0666),
 199         )
 200         if err != nil {
 201                 return TgtError{tgtOrig, err}
 202         }
 203         flock := unix.Flock_t{
 204                 Type:   unix.F_WRLCK,
 205                 Whence: io.SeekStart,
 206         }
 207         lockRelease := func() {
 208                 tracef(CLock, "LOCK_UN: %s", fdLock.Name())
 209                 flock.Type = unix.F_UNLCK
 210                 if err := unix.FcntlFlock(fdLock.Fd(), unix.F_SETLK, &flock); err != nil {
 211                         log.Fatalln(err)
 212                 }
 213                 fdLock.Close()
 214         }
 215         tracef(CLock, "LOCK_NB: %s", fdLock.Name())
 216
 217         // Waiting for job completion, already taken by someone else
 218         if err = unix.FcntlFlock(fdLock.Fd(), unix.F_SETLK, &flock); err != nil {
 219                 if uintptr(err.(syscall.Errno)) != uintptr(unix.EAGAIN) {
 220                         fdLock.Close()
 221                         return TgtError{tgtOrig, err}
 222                 }
 223                 Jobs.Add(1)
 224                 if err = unix.FcntlFlock(fdLock.Fd(), unix.F_GETLK, &flock); err != nil {
 225                         log.Fatalln(err)
 226                 }
 227                 tracef(CDebug, "waiting: %s (pid=%d)", tgtOrig, flock.Pid)
 228                 if FdStatus != nil {
 229                         if _, err = FdStatus.Write([]byte{StatusWait}); err != nil {
 230                                 log.Fatalln(err)
 231                         }
 232                 }
 233                 go func() {
 234                         defer Jobs.Done()
 235                         tracef(CLock, "LOCK_EX: %s", fdLock.Name())
 236                         if err := unix.FcntlFlock(fdLock.Fd(), unix.F_SETLKW, &flock); err != nil {
 237                                 log.Fatalln(err)
 238                         }
 239                         lockRelease()
 240                         tracef(CDebug, "waiting done: %s", tgtOrig)
 241                         if FdStatus != nil {
 242                                 if _, err = FdStatus.Write([]byte{StatusWaited}); err != nil {
 243                                         log.Fatalln(err)
 244                                 }
 245                         }
 246                         var depInfo *DepInfo
 247                         fdDep, err := os.Open(path.Join(redoDir, tgt+DepSuffix))
 248                         if err != nil {
 249                                 if os.IsNotExist(err) {
 250                                         err = errors.New("was not built: no .rec")
 251                                 }
 252                                 goto Finish
 253                         }
 254                         defer fdDep.Close()
 255                         depInfo, err = depRead(fdDep)
 256                         if err != nil {
 257                                 goto Finish
 258                         }
 259                         if depInfo.build != BuildUUID {
 260                                 err = errors.New("was not built: build differs")
 261                         }
 262                 Finish:
 263                         if err != nil {
 264                                 err = TgtError{tgtOrig, err}
 265                         }
 266                         errs <- err
 267                 }()
 268                 return nil
 269         }
 270
 271         // Check if target is not modified externally
 272         modified, inodePrev, err := isModified(cwd, redoDir, tgt)
 273         if err != nil {
 274                 lockRelease()
 275                 return TgtError{tgtOrig, err}
 276         }
 277         if modified {
 278                 lockRelease()
 279                 if StopIfMod {
 280                         return fmt.Errorf("%s externally modified", tgtOrig)
 281                 }
 282                 tracef(CWarn, "%s externally modified: not redoing", tgtOrig)
 283                 go func() {
 284                         errs <- nil
 285                 }()
 286                 return nil
 287         }
 288
 289         // Start preparing .rec
 290         fdDep, err := tempfile(redoDir, tgt+DepSuffix)
 291         if err != nil {
 292                 lockRelease()
 293                 return TgtError{tgtOrig, err}
 294         }
 295         fdDepPath := fdDep.Name()
 296         cleanup := func() {
 297                 lockRelease()
 298                 fdDep.Close()
 299                 os.Remove(fdDep.Name())
 300         }
 301         if _, err = recfile.NewWriter(fdDep).WriteFields(
 302                 recfile.Field{Name: "Build", Value: BuildUUID},
 303         ); err != nil {
 304                 cleanup()
 305                 return TgtError{tgtOrig, err}
 306         }
 307
 308         // Find .do
 309         doFile, upLevels, err := findDo(fdDep, cwd, tgt)
 310         if err != nil {
 311                 cleanup()
 312                 return TgtError{tgtOrig, err}
 313         }
 314         if doFile == "" {
 315                 cleanup()
 316                 return TgtError{tgtOrig, errors.New("no .do found")}
 317         }
 318
 319         // Determine basename and DIRPREFIX
 320         doFileRelPath := doFile
 321         ents := strings.Split(cwd, "/")
 322         ents = ents[len(ents)-upLevels:]
 323         dirPrefix := path.Join(ents...)
 324         cwdOrig := cwd
 325         for i := 0; i < upLevels; i++ {
 326                 cwd = path.Join(cwd, "..")
 327                 doFileRelPath = path.Join("..", doFileRelPath)
 328         }
 329         cwd = path.Clean(cwd)
 330         doFilePath := path.Join(cwd, doFile)
 331         basename := tgt
 332         runErr := RunError{Tgt: tgtOrig}
 333         if strings.HasPrefix(doFile, "default.") {
 334                 basename = tgt[:len(tgt)-(len(doFile)-len("default.")-len(".do"))-1]
 335                 runErr.DoFile = doFileRelPath
 336         }
 337
 338         if err = depWrite(fdDep, cwdOrig, doFileRelPath); err != nil {
 339                 cleanup()
 340                 return TgtError{tgtOrig, err}
 341         }
 342         fdDep.Close()
 343         tracef(CWait, "%s", runErr.Name())
 344
 345         // Prepare command line
 346         var cmdName string
 347         var args []string
 348         if err = unix.Access(doFilePath, unix.X_OK); err == nil {
 349                 cmdName = doFilePath
 350                 args = make([]string, 0, 3)
 351         } else {
 352                 cmdName = "/bin/sh"
 353                 if traced || TracedAll {
 354                         args = append(args, "-ex")
 355                 } else {
 356                         args = append(args, "-e")
 357                 }
 358                 args = append(args, doFile)
 359         }
 360
 361         // Temporary file for stdout
 362         fdStdout, err := tempfile(cwdOrig, tgt)
 363         if err != nil {
 364                 cleanup()
 365                 return TgtError{tgtOrig, err}
 366         }
 367         stdoutPath := fdStdout.Name()
 368         fdStdout.Close()
 369         tmpPath := stdoutPath + ".3" // and for $3
 370         tmpPathRel, err := filepath.Rel(cwd, tmpPath)
 371         if err != nil {
 372                 panic(err)
 373         }
 374         args = append(
 375                 args,
 376                 path.Join(dirPrefix, tgt),
 377                 path.Join(dirPrefix, basename),
 378                 tmpPathRel,
 379         )
 380
 381         cmd := exec.Command(cmdName, args...)
 382         cmd.Dir = cwd
 383         // cmd.Stdin reads from /dev/null by default
 384         cmd.Env = append(os.Environ(), fmt.Sprintf("%s=%d", EnvLevel, Level+1))
 385         cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%s", EnvDirPrefix, dirPrefix))
 386         cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%s", EnvBuildUUID, BuildUUID))
 387
 388         childStderrPrefix := tempsuffix()
 389         cmd.Env = append(cmd.Env, fmt.Sprintf(
 390                 "%s=%s", EnvStderrPrefix, childStderrPrefix,
 391         ))
 392
 393         fdNum := 0
 394         cmd.ExtraFiles = append(cmd.ExtraFiles, FdOODTgts)
 395         cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%d", EnvOODTgtsFd, 3+fdNum))
 396         fdNum++
 397         cmd.ExtraFiles = append(cmd.ExtraFiles, FdOODTgtsLock)
 398         cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%d", EnvOODTgtsLockFd, 3+fdNum))
 399         fdNum++
 400
 401         if FdStatus == nil {
 402                 cmd.Env = append(cmd.Env, fmt.Sprintf("%s=NO", EnvStatusFd))
 403         } else {
 404                 cmd.ExtraFiles = append(cmd.ExtraFiles, FdStatus)
 405                 cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%d", EnvStatusFd, 3+fdNum))
 406                 fdNum++
 407         }
 408
 409         // Preparing stderr
 410         var fdStderr *os.File
 411         if StderrKeep {
 412                 fdStderr, err = os.OpenFile(
 413                         path.Join(redoDir, tgt+LogSuffix),
 414                         os.O_WRONLY|os.O_CREATE|os.O_TRUNC,
 415                         os.FileMode(0666),
 416                 )
 417                 if err != nil {
 418                         cleanup()
 419                         return TgtError{tgtOrig, err}
 420                 }
 421         }
 422         shCtx := fmt.Sprintf(
 423                 "sh: %s: %s %s cwd:%s dirprefix:%s",
 424                 tgtOrig, cmdName, args, cwd, dirPrefix,
 425         )
 426         tracef(CDebug, "%s", shCtx)
 427
 428         Jobs.Add(1)
 429         go func() {
 430                 jsToken := jsAcquire(shCtx)
 431                 if JSR == nil {
 432                         // infinite jobs
 433                         cmd.Env = append(cmd.Env, fmt.Sprintf("%s=NO", EnvJobs))
 434                 } else {
 435                         cmd.ExtraFiles = append(cmd.ExtraFiles, JSR)
 436                         cmd.ExtraFiles = append(cmd.ExtraFiles, JSW)
 437                         makeFlags := fmt.Sprintf(
 438                                 "%s %s%d,%d", MakeFlags, MakeJSArg, 3+fdNum+0, 3+fdNum+1,
 439                         )
 440                         makeFlags = strings.Trim(makeFlags, " ")
 441                         cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%s", MakeFlagsName, makeFlags))
 442                         fdNum += 2
 443                         cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%d", EnvJSToken, jsToken))
 444                 }
 445
 446                 if FdStatus != nil {
 447                         if _, err = FdStatus.Write([]byte{StatusRun}); err != nil {
 448                                 log.Fatalln(err)
 449                         }
 450                 }
 451
 452                 var finished time.Time
 453                 var exitErr *exec.ExitError
 454                 started := time.Now()
 455                 runErr.Started = &started
 456                 fdStdout, err = os.OpenFile(stdoutPath, os.O_RDWR, os.FileMode(0666))
 457                 if err != nil {
 458                         runErr.Err = err
 459                         errs <- runErr
 460                         return
 461                 }
 462                 cmd.Stdout = fdStdout
 463                 fdDep, err = os.OpenFile(fdDepPath, os.O_WRONLY|os.O_APPEND, os.FileMode(0666))
 464                 if err != nil {
 465                         runErr.Err = err
 466                         errs <- runErr
 467                         return
 468                 }
 469                 cmd.ExtraFiles = append(cmd.ExtraFiles, fdDep)
 470                 cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%d", EnvDepFd, 3+fdNum))
 471                 fdNum++
 472                 cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%s", EnvDepCwd, cwd))
 473
 474                 defer func() {
 475                         jsRelease(shCtx, jsToken)
 476                         fdDep.Close()
 477                         fdStdout.Close()
 478                         if fdStderr != nil {
 479                                 fdStderr.Close()
 480                                 logRecPath := path.Join(redoDir, tgt+LogRecSuffix)
 481                                 if fdStderr, err = os.OpenFile(
 482                                         logRecPath,
 483                                         os.O_WRONLY|os.O_CREATE|os.O_TRUNC,
 484                                         os.FileMode(0666),
 485                                 ); err == nil {
 486                                         fields := []recfile.Field{
 487                                                 {Name: "Build", Value: BuildUUID},
 488                                                 {Name: "PPID", Value: strconv.Itoa(os.Getpid())},
 489                                                 {Name: "Cwd", Value: cwd},
 490                                         }
 491                                         if cmd.Process != nil {
 492                                                 fields = append(fields, recfile.Field{
 493                                                         Name: "PID", Value: strconv.Itoa(cmd.Process.Pid),
 494                                                 })
 495                                         }
 496                                         ts := new(tai64n.TAI64N)
 497                                         ts.FromTime(started)
 498                                         fields = append(fields,
 499                                                 recfile.Field{Name: "Started", Value: tai64n.Encode(ts[:])},
 500                                         )
 501                                         ts.FromTime(finished)
 502                                         fields = append(fields,
 503                                                 recfile.Field{Name: "Finished", Value: tai64n.Encode(ts[:])})
 504                                         fields = append(fields, recfile.Field{
 505                                                 Name:  "Duration",
 506                                                 Value: strconv.FormatInt(finished.Sub(started).Nanoseconds(), 10),
 507                                         })
 508                                         fields = append(fields, recfile.Field{Name: "Cmd", Value: cmdName})
 509                                         for _, arg := range args {
 510                                                 fields = append(fields, recfile.Field{Name: "Arg", Value: arg})
 511                                         }
 512                                         for _, env := range cmd.Env {
 513                                                 fields = append(fields, recfile.Field{Name: "Env", Value: env})
 514                                         }
 515                                         if exitErr != nil {
 516                                                 fields = append(fields, recfile.Field{
 517                                                         Name:  "ExitCode",
 518                                                         Value: strconv.Itoa(exitErr.ProcessState.ExitCode()),
 519                                                 })
 520                                         }
 521                                         w := bufio.NewWriter(fdStderr)
 522
 523                                         var depInfo *DepInfo
 524                                         fdDep, err := os.Open(fdDepPath)
 525                                         if err != nil {
 526                                                 goto Err
 527                                         }
 528                                         depInfo, err = depRead(fdDep)
 529                                         fdDep.Close()
 530                                         if err != nil {
 531                                                 goto Err
 532                                         }
 533                                         for _, dep := range depInfo.ifchanges {
 534                                                 fields = append(fields, recfile.Field{
 535                                                         Name:  "Ifchange",
 536                                                         Value: dep["Target"],
 537                                                 })
 538                                         }
 539                                         _, err = recfile.NewWriter(w).WriteFields(fields...)
 540                                         if err != nil {
 541                                                 goto Err
 542                                         }
 543                                         err = w.Flush()
 544                                 Err:
 545                                         if err != nil {
 546                                                 log.Println(err)
 547                                                 os.Remove(logRecPath)
 548                                         }
 549                                         fdStderr.Close()
 550                                 } else {
 551                                         log.Println("can not open", logRecPath, ":", err)
 552                                 }
 553                         }
 554                         lockRelease()
 555                         os.Remove(fdDep.Name())
 556                         os.Remove(fdStdout.Name())
 557                         os.Remove(tmpPath)
 558                         os.Remove(fdLock.Name())
 559                         if FdStatus != nil {
 560                                 if _, err = FdStatus.Write([]byte{StatusDone}); err != nil {
 561                                         log.Fatalln(err)
 562                                 }
 563                         }
 564                         Jobs.Done()
 565                 }()
 566                 stderr, err := cmd.StderrPipe()
 567                 if err != nil {
 568                         runErr.Err = err
 569                         errs <- runErr
 570                         return
 571                 }
 572                 started = time.Now()
 573                 err = cmd.Start()
 574                 if err != nil {
 575                         runErr.Err = err
 576                         errs <- runErr
 577                         return
 578                 }
 579                 RunningProcsM.Lock()
 580                 RunningProcs[cmd.Process.Pid] = cmd.Process
 581                 RunningProcsM.Unlock()
 582                 pid := fmt.Sprintf("[%d]", cmd.Process.Pid)
 583                 tracef(CDebug, "%s runs %s", tgtOrig, pid)
 584
 585                 stderrTerm := make(chan struct{})
 586                 go func() {
 587                         scanner := bufio.NewScanner(stderr)
 588                         var line string
 589                         ts := new(tai64n.TAI64N)
 590                         for scanner.Scan() {
 591                                 line = scanner.Text()
 592                                 if strings.HasPrefix(line, childStderrPrefix) {
 593                                         line = line[len(childStderrPrefix):]
 594                                         os.Stderr.WriteString(StderrPrefix + line + "\n")
 595                                         continue
 596                                 }
 597                                 if fdStderr != nil {
 598                                         ts.FromTime(time.Now())
 599                                         LogMutex.Lock()
 600                                         fmt.Fprintln(fdStderr, tai64n.Encode(ts[:]), line)
 601                                         LogMutex.Unlock()
 602                                 }
 603                                 if StderrSilent {
 604                                         continue
 605                                 }
 606                                 if MyPid == 0 {
 607                                         tracef(CNone, "%s", line)
 608                                 } else {
 609                                         tracef(CNone, "%s %s", pid, line)
 610                                 }
 611                         }
 612                         close(stderrTerm)
 613                 }()
 614
 615                 // Wait for job completion
 616                 <-stderrTerm
 617                 err = cmd.Wait()
 618                 RunningProcsM.Lock()
 619                 delete(RunningProcs, cmd.Process.Pid)
 620                 RunningProcsM.Unlock()
 621                 finished = time.Now()
 622                 runErr.Finished = &finished
 623                 if err != nil {
 624                         exitErr = err.(*exec.ExitError)
 625                         runErr.Err = err
 626                         errs <- runErr
 627                         return
 628                 }
 629
 630                 // Was $1 touched?
 631                 if fd, err := os.Open(path.Join(cwdOrig, tgt)); err == nil {
 632                         if inodePrev == nil {
 633                                 fd.Close()
 634                                 runErr.Err = Err1WasTouched
 635                                 errs <- runErr
 636                                 return
 637                         }
 638                         inode, err := inodeFromFile(fd)
 639                         fd.Close()
 640                         if err != nil {
 641                                 runErr.Err = err
 642                                 errs <- runErr
 643                                 return
 644                         }
 645                         if !inode.Equals(inodePrev) {
 646                                 runErr.Err = Err1WasTouched
 647                                 errs <- runErr
 648                                 return
 649                         }
 650                 }
 651
 652                 if inodePrev != nil {
 653                         if fd, err := os.Open(path.Join(cwdOrig, tgt)); err == nil {
 654                                 inode, err := inodeFromFile(fd)
 655                                 fd.Close()
 656                                 if err == nil && !inode.Equals(inodePrev) {
 657                                         runErr.Err = Err1WasTouched
 658                                         errs <- runErr
 659                                         return
 660                                 }
 661                         }
 662                 }
 663
 664                 // Does it produce both stdout and tmp?
 665                 fiStdout, err := os.Stat(fdStdout.Name())
 666                 if err != nil {
 667                         runErr.Err = err
 668                         errs <- runErr
 669                         return
 670                 }
 671                 tmpExists := false
 672                 _, err = os.Stat(tmpPath)
 673                 if err == nil {
 674                         if fiStdout.Size() > 0 {
 675                                 runErr.Err = errors.New("created both tmp and stdout")
 676                                 errs <- runErr
 677                                 return
 678                         }
 679                         tmpExists = true
 680                 } else if !os.IsNotExist(err) {
 681                         runErr.Err = err
 682                         errs <- runErr
 683                         return
 684                 }
 685
 686                 // Determine what file we must process at last
 687                 var fd *os.File
 688                 if tmpExists {
 689                         fd, err = os.Open(tmpPath)
 690                         if err != nil {
 691                                 goto Finish
 692                         }
 693                         defer fd.Close()
 694                 } else if fiStdout.Size() > 0 {
 695                         fd = fdStdout
 696                 }
 697
 698                 // Do we need to ifcreate it, or ifchange with renaming?
 699                 if fd == nil {
 700                         os.Remove(path.Join(cwdOrig, tgt))
 701                         err = ifcreate(fdDep, tgt)
 702                         if err != nil {
 703                                 goto Finish
 704                         }
 705                 } else {
 706                         if !NoSync {
 707                                 err = fd.Sync()
 708                                 if err != nil {
 709                                         goto Finish
 710                                 }
 711                         }
 712                         err = os.Rename(fd.Name(), path.Join(cwdOrig, tgt))
 713                         if err != nil {
 714                                 goto Finish
 715                         }
 716                         if !NoSync {
 717                                 err = syncDir(cwdOrig)
 718                                 if err != nil {
 719                                         goto Finish
 720                                 }
 721                         }
 722                         err = depWrite(fdDep, cwdOrig, tgt)
 723                         if err != nil {
 724                                 goto Finish
 725                         }
 726                 }
 727
 728                 // Commit .rec
 729                 if !NoSync {
 730                         err = fdDep.Sync()
 731                         if err != nil {
 732                                 goto Finish
 733                         }
 734                 }
 735                 fdDepPath = path.Join(redoDir, tgt+DepSuffix)
 736                 err = os.Rename(fdDep.Name(), fdDepPath)
 737                 if err != nil {
 738                         goto Finish
 739                 }
 740                 if !NoSync {
 741                         err = syncDir(redoDir)
 742                         if err != nil {
 743                                 goto Finish
 744                         }
 745                 }
 746
 747                 // Post-commit .rec sanitizing
 748                 fdDep.Close()
 749                 if fdDepR, err := os.Open(fdDepPath); err == nil {
 750                         depInfo, err := depRead(fdDepR)
 751                         fdDepR.Close()
 752                         if err != nil {
 753                                 goto Finish
 754                         }
 755                         ifchangeSeen := make(map[string]struct{}, len(depInfo.ifchanges))
 756                         for _, dep := range depInfo.ifchanges {
 757                                 ifchangeSeen[dep["Target"]] = struct{}{}
 758                         }
 759                         for _, dep := range depInfo.ifcreates {
 760                                 if _, exists := ifchangeSeen[dep]; exists {
 761                                         tracef(CWarn, "simultaneous ifcreate and ifchange records: %s", tgt)
 762                                 }
 763                         }
 764                 }
 765
 766         Finish:
 767                 runErr.Err = err
 768                 errs <- runErr
 769         }()
 770         return nil
 771 }
 772
 773 func isOkRun(err error) bool {
 774         if err == nil {
 775                 return true
 776         }
 777         var runErr RunError
 778         if errors.As(err, &runErr) && runErr.Err == nil {
 779                 tracef(CRedo, "%s", runErr.Name())
 780                 return true
 781         }
 782         tracef(CErr, "%s", err)
 783         return false
 784 }