run.go

   1 /*
   2 goredo -- djb's redo implementation on pure Go
   3 Copyright (C) 2020-2023 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         "bytes"
  25         "crypto/rand"
  26         "encoding/hex"
  27         "errors"
  28         "flag"
  29         "fmt"
  30         "io"
  31         "io/fs"
  32         "log"
  33         "os"
  34         "os/exec"
  35         "path"
  36         "strconv"
  37         "strings"
  38         "sync"
  39         "syscall"
  40         "time"
  41
  42         "go.cypherpunks.ru/recfile"
  43         "go.cypherpunks.ru/tai64n/v2"
  44         "golang.org/x/sys/unix"
  45 )
  46
  47 const (
  48         EnvDepFd        = "REDO_DEP_FD"
  49         EnvDirPrefix    = "REDO_DIRPREFIX"
  50         EnvDepCwd       = "REDO_DEP_CWD"
  51         EnvBuildUUID    = "REDO_BUILD_UUID"
  52         EnvStderrPrefix = "REDO_STDERR_PREFIX"
  53         EnvTrace        = "REDO_TRACE"
  54         EnvStderrKeep   = "REDO_LOGS"
  55         EnvStderrSilent = "REDO_SILENT"
  56         EnvNoSync       = "REDO_NO_SYNC"
  57         EnvStopIfMod    = "REDO_STOP_IF_MODIFIED"
  58
  59         RedoDir      = ".redo"
  60         LockSuffix   = ".lock"
  61         DepSuffix    = ".rec"
  62         TmpPrefix    = ".redo."
  63         LogSuffix    = ".log"
  64         LogRecSuffix = ".log-rec"
  65 )
  66
  67 var (
  68         NoSync       = false
  69         StderrKeep   = false
  70         StderrSilent = false
  71         StderrPrefix string
  72         StopIfMod    = false
  73         Jobs         sync.WaitGroup
  74
  75         flagTrace          *bool
  76         flagTraceAll       *bool
  77         flagStderrKeep     *bool
  78         flagStderrSilent   *bool
  79         flagForcedIfchange *bool
  80
  81         TracedAll bool
  82
  83         RunningProcs  = map[int]*os.Process{}
  84         RunningProcsM sync.Mutex
  85
  86         Err1WasTouched = errors.New("$1 was explicitly touched")
  87 )
  88
  89 func init() {
  90         cmdName := CmdName()
  91         if !(cmdName == CmdNameRedo || cmdName == CmdNameRedoIfchange) {
  92                 return
  93         }
  94         flagTrace = flag.Bool("x", false, "trace (sh -x) current targets")
  95         flagTraceAll = flag.Bool("xx", false,
  96                 fmt.Sprintf("trace (sh -x) all targets (%s=1)", EnvTrace))
  97         flagStderrKeep = flag.Bool("k", false,
  98                 fmt.Sprintf("keep job's stderr (%s=1)", EnvStderrKeep))
  99         flagStderrSilent = flag.Bool("s", false,
 100                 fmt.Sprintf("silent, do not print job's stderr (%s=1)", EnvStderrSilent))
 101         flagForcedIfchange = flag.Bool("f", false, "forced redo-ifchange")
 102 }
 103
 104 type RunError struct {
 105         Tgt      *Tgt
 106         DoFile   string
 107         Started  *time.Time
 108         Finished *time.Time
 109         Err      error
 110 }
 111
 112 func (e *RunError) Name() string {
 113         var name string
 114         if e.DoFile == "" {
 115                 name = e.Tgt.String()
 116         } else {
 117                 name = fmt.Sprintf("%s (%s)", e.Tgt, e.DoFile)
 118         }
 119         if e.Finished == nil {
 120                 return name
 121         }
 122         return fmt.Sprintf("%s (%.3fs)", name, e.Finished.Sub(*e.Started).Seconds())
 123 }
 124
 125 func (e RunError) Error() string {
 126         return fmt.Sprintf("%s: %s", e.Name(), e.Err)
 127 }
 128
 129 func mkdirs(pth string) error {
 130         if FileExists(pth) {
 131                 return nil
 132         }
 133         return os.MkdirAll(pth, os.FileMode(0777))
 134 }
 135
 136 func isModified(depInfo *DepInfo, tgt *Tgt) (
 137         modified bool, ourInode *Inode, hshPrev []byte, err error,
 138 ) {
 139         if depInfo == nil {
 140                 return
 141         }
 142         for _, dep := range depInfo.ifchanges {
 143                 if dep.tgt.a != tgt.a {
 144                         continue
 145                 }
 146                 ourInode, err = inodeFromFileByPath(tgt.a)
 147                 if err != nil {
 148                         if os.IsNotExist(err) {
 149                                 err = nil
 150                                 return
 151                         }
 152                         err = ErrLine(err)
 153                         return
 154                 }
 155                 hshPrev = dep.hash
 156                 modified = !ourInode.Equals(dep.inode)
 157                 break
 158         }
 159         return
 160 }
 161
 162 func syncDir(dir string) error {
 163         fd, err := os.Open(dir)
 164         if err != nil {
 165                 return err
 166         }
 167         err = fd.Sync()
 168         fd.Close()
 169         return err
 170 }
 171
 172 func runScript(tgt *Tgt, errs chan error, forced, traced bool) error {
 173         redoDir := path.Join(tgt.h, RedoDir)
 174         if err := mkdirs(redoDir); err != nil {
 175                 return TgtError{tgt, ErrLine(err)}
 176         }
 177
 178         shCtx := fmt.Sprintf("sh: %s: cwd:%s", tgt, tgt.h)
 179         jsToken := jsAcquire(shCtx)
 180         jsNeedsRelease := true
 181         defer func() {
 182                 if jsNeedsRelease {
 183                         jsRelease(shCtx, jsToken)
 184                 }
 185         }()
 186
 187         // Acquire lock
 188         fdLock, err := os.OpenFile(
 189                 path.Join(redoDir, tgt.t+LockSuffix),
 190                 os.O_WRONLY|os.O_TRUNC|os.O_CREATE,
 191                 os.FileMode(0666),
 192         )
 193         if err != nil {
 194                 return TgtError{tgt, ErrLine(err)}
 195         }
 196         flock := unix.Flock_t{
 197                 Type:   unix.F_WRLCK,
 198                 Whence: io.SeekStart,
 199         }
 200         lockRelease := func() {
 201                 tracef(CLock, "LOCK_UN: %s", fdLock.Name())
 202                 flock.Type = unix.F_UNLCK
 203                 if err := unix.FcntlFlock(fdLock.Fd(), unix.F_SETLK, &flock); err != nil {
 204                         log.Fatalln(err, fdLock.Name())
 205                 }
 206                 fdLock.Close()
 207         }
 208         tracef(CLock, "LOCK_NB: %s", fdLock.Name())
 209
 210         // Waiting for job completion, already taken by someone else
 211         if err = unix.FcntlFlock(fdLock.Fd(), unix.F_SETLK, &flock); err != nil {
 212                 if uintptr(err.(syscall.Errno)) != uintptr(unix.EAGAIN) {
 213                         fdLock.Close()
 214                         return TgtError{tgt, ErrLine(err)}
 215                 }
 216                 Jobs.Add(1)
 217                 if err = unix.FcntlFlock(fdLock.Fd(), unix.F_GETLK, &flock); err != nil {
 218                         log.Fatalln(err, fdLock.Name())
 219                 }
 220                 tracef(CDebug, "waiting: %s (pid=%d)", tgt, flock.Pid)
 221                 if FdStatus != nil {
 222                         if _, err = FdStatus.Write([]byte{StatusWait}); err != nil {
 223                                 log.Fatal(err)
 224                         }
 225                 }
 226                 go func() {
 227                         defer Jobs.Done()
 228                         tracef(CLock, "LOCK_EX: %s", fdLock.Name())
 229                 LockAgain:
 230                         if err := unix.FcntlFlock(fdLock.Fd(), unix.F_SETLKW, &flock); err != nil {
 231                                 if errors.Is(err, unix.EDEADLK) {
 232                                         time.Sleep(10 * time.Millisecond)
 233                                         goto LockAgain
 234                                 }
 235                                 log.Fatalln(err, fdLock.Name())
 236                         }
 237                         lockRelease()
 238                         tracef(CDebug, "waiting done: %s", tgt)
 239                         if FdStatus != nil {
 240                                 if _, err = FdStatus.Write([]byte{StatusWaited}); err != nil {
 241                                         log.Fatal(err)
 242                                 }
 243                         }
 244                         build, err := depReadBuild(tgt.Dep())
 245                         if err == nil {
 246                                 if build != BuildUUID {
 247                                         err = errors.New("was not built: build differs")
 248                                 }
 249                         } else {
 250                                 if errors.Is(err, fs.ErrNotExist) {
 251                                         err = errors.New("was not built: no .rec")
 252                                 }
 253                         }
 254                         if err != nil {
 255                                 err = TgtError{tgt, err}
 256                         }
 257                         errs <- err
 258                 }()
 259                 return nil
 260         }
 261
 262         // It scans the whole .rec file while searching for the single target,
 263         // but that one is always located at the very end
 264         depInfo, err := depRead(tgt)
 265         if err != nil {
 266                 if errors.Is(err, fs.ErrNotExist) {
 267                         err = nil
 268                 } else {
 269                         lockRelease()
 270                         return TgtError{tgt, ErrLine(err)}
 271                 }
 272         }
 273
 274         // Check if it was already built in parallel
 275         if !forced && depInfo != nil && depInfo.build == BuildUUID {
 276                 lockRelease()
 277                 errs <- nil
 278                 return nil
 279         }
 280
 281         // Check if target is not modified externally
 282         modified, inodePrev, hshPrev, err := isModified(depInfo, tgt)
 283         if err != nil {
 284                 lockRelease()
 285                 return TgtError{tgt, ErrLine(err)}
 286         }
 287         if modified {
 288                 lockRelease()
 289                 if StopIfMod {
 290                         return fmt.Errorf("%s externally modified", tgt)
 291                 }
 292                 tracef(CWarn, "%s externally modified: not redoing", tgt)
 293                 go func() {
 294                         errs <- nil
 295                 }()
 296                 return nil
 297         }
 298         depInfo = nil
 299
 300         // Start preparing .rec
 301         fdDep, err := tempfile(redoDir, tgt.t+DepSuffix)
 302         if err != nil {
 303                 lockRelease()
 304                 return TgtError{tgt, ErrLine(err)}
 305         }
 306         fdDepOpened := true
 307         fdDepPath := fdDep.Name()
 308         cleanup := func() {
 309                 lockRelease()
 310                 if fdDepOpened {
 311                         fdDep.Close()
 312                 }
 313                 os.Remove(fdDep.Name())
 314         }
 315         if _, err = recfile.NewWriter(fdDep).WriteFields(
 316                 recfile.Field{Name: "Build", Value: BuildUUID},
 317         ); err != nil {
 318                 cleanup()
 319                 return TgtError{tgt, ErrLine(err)}
 320         }
 321
 322         var cwd string
 323         var dirPrefix string
 324         var doFile *Tgt
 325         basename := tgt.t
 326         runErr := RunError{Tgt: tgt}
 327         // Determine basename and DIRPREFIX
 328         {
 329                 doFileRelPath, upLevels, err := findDo(fdDep, tgt.h, tgt.t)
 330                 if err != nil {
 331                         cleanup()
 332                         return TgtError{tgt, ErrLine(err)}
 333                 }
 334                 if doFileRelPath == "" {
 335                         cleanup()
 336                         return TgtError{tgt, errors.New("no .do found")}
 337                 }
 338                 // ents := strings.Split(strings.TrimSuffix(tgt.h, "/"), "/")
 339                 ents := strings.Split(tgt.h, "/")
 340                 ents = ents[len(ents)-upLevels:]
 341                 dirPrefix = path.Join(ents...)
 342                 ups := make([]string, 0, upLevels+2)
 343                 ups = append(ups, tgt.h)
 344                 for i := 0; i < upLevels; i++ {
 345                         ups = append(ups, "..")
 346                 }
 347                 ups = append(ups, doFileRelPath)
 348                 cwd = path.Clean(path.Join(ups[:len(ups)-1]...))
 349                 doFile = NewTgt(path.Join(ups...))
 350                 if strings.HasPrefix(doFile.t, "default.") {
 351                         basename = basename[:len(basename)-(len(doFile.t)-len("default.")-len(".do"))-1]
 352                         runErr.DoFile = doFile.String()
 353                 }
 354         }
 355
 356         if err = depWrite(fdDep, tgt.h, doFile, nil); err != nil {
 357                 cleanup()
 358                 return TgtError{tgt, ErrLine(err)}
 359         }
 360         fdDep.Close()
 361         fdDepOpened = false
 362         tracef(CWait, "%s", runErr.Name())
 363
 364         // Prepare command line
 365         var cmdName string
 366         var args []string
 367         if err = unix.Access(doFile.String(), unix.X_OK); err == nil {
 368                 cmdName = doFile.t
 369                 args = make([]string, 0, 3)
 370         } else {
 371                 cmdName = "/bin/sh"
 372                 if traced || TracedAll {
 373                         args = append(args, "-ex")
 374                 } else {
 375                         args = append(args, "-e")
 376                 }
 377                 args = append(args, doFile.t)
 378         }
 379
 380         // Temporary file for stdout
 381         fdStdout, err := tempfile(tgt.h, tgt.t)
 382         if err != nil {
 383                 cleanup()
 384                 return TgtError{tgt, ErrLine(err)}
 385         }
 386         stdoutPath := fdStdout.Name()
 387         fdStdout.Close()
 388         tmpPath := stdoutPath + ".3" // and for $3
 389         tmpPathRel := mustRel(cwd, tmpPath)
 390         args = append(
 391                 args,
 392                 path.Join(dirPrefix, tgt.t),
 393                 path.Join(dirPrefix, basename),
 394                 tmpPathRel,
 395         )
 396         shCtx = fmt.Sprintf(
 397                 "sh: %s: %s %s cwd:%s dirprefix:%s",
 398                 tgt, cmdName, args, cwd, dirPrefix,
 399         )
 400
 401         cmd := exec.Command(cmdName, args...)
 402         cmd.Dir = cwd
 403         // cmd.Stdin reads from /dev/null by default
 404         cmd.Env = append(os.Environ(), fmt.Sprintf("%s=%d", EnvLevel, Level+1))
 405         cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%s", EnvDirPrefix, dirPrefix))
 406         cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%s", EnvBuildUUID, BuildUUID))
 407
 408         childStderrPrefixRaw := make([]byte, 8)
 409         if _, err = io.ReadFull(rand.Reader, childStderrPrefixRaw); err != nil {
 410                 panic(err)
 411         }
 412         childStderrPrefix := hex.EncodeToString(childStderrPrefixRaw)
 413         cmd.Env = append(cmd.Env, fmt.Sprintf(
 414                 "%s=%s", EnvStderrPrefix, childStderrPrefix,
 415         ))
 416
 417         fdNum := 0
 418         cmd.ExtraFiles = append(cmd.ExtraFiles, FdOODTgts)
 419         cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%d", EnvOODTgtsFd, 3+fdNum))
 420         fdNum++
 421         cmd.ExtraFiles = append(cmd.ExtraFiles, FdOODTgtsLock)
 422         cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%d", EnvOODTgtsLockFd, 3+fdNum))
 423         fdNum++
 424
 425         if FdStatus == nil {
 426                 cmd.Env = append(cmd.Env, fmt.Sprintf("%s=NO", EnvStatusFd))
 427         } else {
 428                 cmd.ExtraFiles = append(cmd.ExtraFiles, FdStatus)
 429                 cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%d", EnvStatusFd, 3+fdNum))
 430                 fdNum++
 431         }
 432
 433         // Preparing stderr
 434         var fdStderr *os.File
 435         if StderrKeep {
 436                 fdStderr, err = os.OpenFile(
 437                         path.Join(redoDir, tgt.t+LogSuffix),
 438                         os.O_WRONLY|os.O_CREATE|os.O_TRUNC,
 439                         os.FileMode(0666),
 440                 )
 441                 if err != nil {
 442                         cleanup()
 443                         return TgtError{tgt, ErrLine(err)}
 444                 }
 445         }
 446         tracef(CDebug, "%s", shCtx)
 447
 448         jsNeedsRelease = false
 449         Jobs.Add(1)
 450         go func() {
 451                 if JSR == nil {
 452                         // infinite jobs
 453                         cmd.Env = append(cmd.Env, fmt.Sprintf("%s=NO", EnvJobs))
 454                 } else {
 455                         cmd.ExtraFiles = append(cmd.ExtraFiles, JSR)
 456                         cmd.ExtraFiles = append(cmd.ExtraFiles, JSW)
 457                         makeFlags := fmt.Sprintf(
 458                                 "%s %s%d,%d", MakeFlags, MakeJSArg, 3+fdNum+0, 3+fdNum+1,
 459                         )
 460                         makeFlags = strings.Trim(makeFlags, " ")
 461                         cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%s", MakeFlagsName, makeFlags))
 462                         fdNum += 2
 463                         cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%d", EnvJSToken, jsToken))
 464                 }
 465
 466                 if FdStatus != nil {
 467                         if _, err = FdStatus.Write([]byte{StatusRun}); err != nil {
 468                                 log.Fatal(err)
 469                         }
 470                 }
 471
 472                 defer jsRelease(shCtx, jsToken)
 473
 474                 var finished time.Time
 475                 var exitErr *exec.ExitError
 476                 started := time.Now()
 477                 runErr.Started = &started
 478                 fdStdout, err = os.OpenFile(stdoutPath, os.O_RDWR, os.FileMode(0666))
 479                 if err != nil {
 480                         if fdStderr != nil {
 481                                 fdStderr.Close()
 482                         }
 483                         runErr.Err = err
 484                         errs <- runErr
 485                         return
 486                 }
 487                 cmd.Stdout = fdStdout
 488                 fdDep, err = os.OpenFile(fdDepPath, os.O_WRONLY|os.O_APPEND, os.FileMode(0666))
 489                 if err != nil {
 490                         if fdStderr != nil {
 491                                 fdStderr.Close()
 492                         }
 493                         fdStdout.Close()
 494                         runErr.Err = err
 495                         errs <- runErr
 496                         return
 497                 }
 498                 fdDepOpened = true
 499                 cmd.ExtraFiles = append(cmd.ExtraFiles, fdDep)
 500                 cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%d", EnvDepFd, 3+fdNum))
 501                 fdNum++
 502                 cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%s", EnvDepCwd, cwd))
 503
 504                 defer func() {
 505                         if fdDepOpened {
 506                                 fdDep.Close()
 507                         }
 508                         fdStdout.Close()
 509                         if fdStderr != nil {
 510                                 fdStderr.Close()
 511                                 logRecPath := path.Join(redoDir, tgt.t+LogRecSuffix)
 512                                 if fdStderr, err = os.OpenFile(
 513                                         logRecPath,
 514                                         os.O_WRONLY|os.O_CREATE|os.O_TRUNC,
 515                                         os.FileMode(0666),
 516                                 ); err == nil {
 517                                         fields := []recfile.Field{
 518                                                 {Name: "Build", Value: BuildUUID},
 519                                                 {Name: "PPID", Value: strconv.Itoa(os.Getpid())},
 520                                                 {Name: "Cwd", Value: cwd},
 521                                         }
 522                                         if cmd.Process != nil {
 523                                                 fields = append(fields, recfile.Field{
 524                                                         Name: "PID", Value: strconv.Itoa(cmd.Process.Pid),
 525                                                 })
 526                                         }
 527                                         ts := new(tai64n.TAI64N)
 528                                         ts.FromTime(started)
 529                                         fields = append(fields,
 530                                                 recfile.Field{Name: "Started", Value: tai64n.Encode(ts[:])},
 531                                         )
 532                                         ts.FromTime(finished)
 533                                         fields = append(fields,
 534                                                 recfile.Field{Name: "Finished", Value: tai64n.Encode(ts[:])})
 535                                         fields = append(fields, recfile.Field{
 536                                                 Name:  "Duration",
 537                                                 Value: strconv.FormatInt(finished.Sub(started).Nanoseconds(), 10),
 538                                         })
 539                                         fields = append(fields, recfile.Field{Name: "Cmd", Value: cmdName})
 540                                         for _, arg := range args {
 541                                                 fields = append(fields, recfile.Field{Name: "Arg", Value: arg})
 542                                         }
 543                                         for _, env := range cmd.Env {
 544                                                 fields = append(fields, recfile.Field{Name: "Env", Value: env})
 545                                         }
 546                                         if exitErr != nil {
 547                                                 fields = append(fields, recfile.Field{
 548                                                         Name:  "ExitCode",
 549                                                         Value: strconv.Itoa(exitErr.ProcessState.ExitCode()),
 550                                                 })
 551                                         }
 552
 553                                         w := bufio.NewWriter(fdStderr)
 554                                         {
 555                                                 var ifchanges []string
 556                                                 ifchanges, err = depReadOnlyIfchanges(tgt.Dep())
 557                                                 if err != nil {
 558                                                         err = ErrLine(err)
 559                                                         goto Err
 560                                                 }
 561                                                 for _, dep := range ifchanges {
 562                                                         fields = append(fields, recfile.Field{
 563                                                                 Name:  "Ifchange",
 564                                                                 Value: dep,
 565                                                         })
 566                                                 }
 567                                         }
 568                                         _, err = recfile.NewWriter(w).WriteFields(fields...)
 569                                         if err != nil {
 570                                                 err = ErrLine(err)
 571                                                 goto Err
 572                                         }
 573                                         err = ErrLine(w.Flush())
 574                                 Err:
 575                                         if err != nil {
 576                                                 log.Print(err)
 577                                                 os.Remove(logRecPath)
 578                                         }
 579                                         fdStderr.Close()
 580                                 } else {
 581                                         log.Println("can not open", logRecPath, ":", err)
 582                                 }
 583                         }
 584                         lockRelease()
 585                         os.Remove(fdDep.Name())
 586                         os.Remove(fdStdout.Name())
 587                         os.Remove(tmpPath)
 588                         if FdStatus != nil {
 589                                 if _, err = FdStatus.Write([]byte{StatusDone}); err != nil {
 590                                         log.Fatal(err)
 591                                 }
 592                         }
 593                         Jobs.Done()
 594                 }()
 595                 stderr, err := cmd.StderrPipe()
 596                 if err != nil {
 597                         runErr.Err = err
 598                         errs <- runErr
 599                         return
 600                 }
 601                 started = time.Now()
 602                 err = cmd.Start()
 603                 if err != nil {
 604                         runErr.Err = err
 605                         errs <- runErr
 606                         return
 607                 }
 608                 RunningProcsM.Lock()
 609                 RunningProcs[cmd.Process.Pid] = cmd.Process
 610                 RunningProcsM.Unlock()
 611                 pid := fmt.Sprintf("[%d]", cmd.Process.Pid)
 612                 tracef(CDebug, "%s runs %s", tgt, pid)
 613
 614                 stderrTerm := make(chan struct{})
 615                 go func() {
 616                         scanner := bufio.NewScanner(stderr)
 617                         var line string
 618                         ts := new(tai64n.TAI64N)
 619                         for scanner.Scan() {
 620                                 line = scanner.Text()
 621                                 if strings.HasPrefix(line, childStderrPrefix) {
 622                                         line = line[len(childStderrPrefix):]
 623                                         os.Stderr.WriteString(StderrPrefix + line + "\n")
 624                                         continue
 625                                 }
 626                                 if fdStderr != nil {
 627                                         ts.FromTime(time.Now())
 628                                         LogMutex.Lock()
 629                                         fmt.Fprintln(fdStderr, tai64n.Encode(ts[:]), line)
 630                                         LogMutex.Unlock()
 631                                 }
 632                                 if StderrSilent {
 633                                         continue
 634                                 }
 635                                 if MyPid == 0 {
 636                                         tracef(CNone, "%s", line)
 637                                 } else {
 638                                         tracef(CNone, "%s %s", pid, line)
 639                                 }
 640                         }
 641                         close(stderrTerm)
 642                 }()
 643
 644                 // Wait for job completion
 645                 <-stderrTerm
 646                 err = cmd.Wait()
 647                 RunningProcsM.Lock()
 648                 delete(RunningProcs, cmd.Process.Pid)
 649                 RunningProcsM.Unlock()
 650                 finished = time.Now()
 651                 runErr.Finished = &finished
 652                 if err != nil {
 653                         exitErr = err.(*exec.ExitError)
 654                         runErr.Err = err
 655                         errs <- runErr
 656                         return
 657                 }
 658
 659                 // Was $1 touched?
 660                 if inode, err := inodeFromFileByPath(tgt.a); err == nil {
 661                         if inodePrev == nil {
 662                                 runErr.Err = Err1WasTouched
 663                                 errs <- runErr
 664                                 return
 665                         }
 666                         if err != nil {
 667                                 runErr.Err = err
 668                                 errs <- runErr
 669                                 return
 670                         }
 671                         if !inode.Equals(inodePrev) {
 672                                 runErr.Err = Err1WasTouched
 673                                 errs <- runErr
 674                                 return
 675                         }
 676                 }
 677
 678                 // Does it produce both stdout and tmp?
 679                 fiStdout, err := os.Stat(fdStdout.Name())
 680                 if err != nil {
 681                         runErr.Err = ErrLine(err)
 682                         errs <- runErr
 683                         return
 684                 }
 685                 tmpExists := false
 686                 _, err = os.Stat(tmpPath)
 687                 if err == nil {
 688                         if fiStdout.Size() > 0 {
 689                                 runErr.Err = errors.New("created both tmp and stdout")
 690                                 errs <- runErr
 691                                 return
 692                         }
 693                         tmpExists = true
 694                 } else if !errors.Is(err, fs.ErrNotExist) {
 695                         runErr.Err = ErrLine(err)
 696                         errs <- runErr
 697                         return
 698                 }
 699
 700                 // Determine what file we must process at last
 701                 var fd *os.File
 702                 if tmpExists {
 703                         fd, err = os.Open(tmpPath)
 704                         if err != nil {
 705                                 err = ErrLine(err)
 706                                 goto Finish
 707                         }
 708                         defer fd.Close()
 709                 } else if fiStdout.Size() > 0 {
 710                         fd = fdStdout
 711                 }
 712
 713                 // Do we need to ifcreate it, or ifchange with renaming?
 714                 if fd == nil {
 715                         os.Remove(tgt.a)
 716                         err = ifcreate(fdDep, tgt.t)
 717                         if err != nil {
 718                                 err = ErrLine(err)
 719                                 goto Finish
 720                         }
 721                 } else {
 722                         var hsh []byte
 723                         if hshPrev != nil {
 724                                 _, err = fd.Seek(0, io.SeekStart)
 725                                 if err != nil {
 726                                         err = ErrLine(err)
 727                                         goto Finish
 728                                 }
 729                                 hsh, err = fileHash(fd)
 730                                 if err != nil {
 731                                         err = ErrLine(err)
 732                                         goto Finish
 733                                 }
 734                                 if bytes.Equal(hsh, hshPrev) {
 735                                         tracef(CDebug, "%s has same hash, not renaming", tgt)
 736                                         err = ErrLine(os.Remove(fd.Name()))
 737                                         if err != nil {
 738                                                 goto Finish
 739                                         }
 740                                         err = ErrLine(os.Chtimes(tgt.a, finished, finished))
 741                                         if err != nil {
 742                                                 goto Finish
 743                                         }
 744                                         if !NoSync {
 745                                                 err = ErrLine(syncDir(tgt.h))
 746                                                 if err != nil {
 747                                                         goto Finish
 748                                                 }
 749                                         }
 750                                         err = ErrLine(depWrite(fdDep, tgt.h, tgt, hsh))
 751                                         if err != nil {
 752                                                 goto Finish
 753                                         }
 754                                         goto RecCommit
 755                                 }
 756                         }
 757                         if !NoSync {
 758                                 err = ErrLine(fd.Sync())
 759                                 if err != nil {
 760                                         goto Finish
 761                                 }
 762                         }
 763                         err = ErrLine(os.Rename(fd.Name(), tgt.a))
 764                         if err != nil {
 765                                 goto Finish
 766                         }
 767                         if !NoSync {
 768                                 err = ErrLine(syncDir(tgt.h))
 769                                 if err != nil {
 770                                         goto Finish
 771                                 }
 772                         }
 773                         err = ErrLine(depWrite(fdDep, tgt.h, tgt, hsh))
 774                         if err != nil {
 775                                 goto Finish
 776                         }
 777                 }
 778
 779         RecCommit:
 780                 // Commit .rec
 781                 if !NoSync {
 782                         err = ErrLine(fdDep.Sync())
 783                         if err != nil {
 784                                 goto Finish
 785                         }
 786                 }
 787                 err = ErrLine(os.Rename(fdDep.Name(), tgt.Dep()))
 788                 if err != nil {
 789                         goto Finish
 790                 }
 791                 if !NoSync {
 792                         err = ErrLine(syncDir(redoDir))
 793                         if err != nil {
 794                                 goto Finish
 795                         }
 796                 }
 797                 fdDep.Close()
 798                 fdDepOpened = false
 799
 800                 // Post-commit .rec sanitizing
 801                 if depInfo, err := depRead(tgt); err == nil {
 802                         ifchangeSeen := make(map[string]struct{}, len(depInfo.ifchanges))
 803                         for _, dep := range depInfo.ifchanges {
 804                                 ifchangeSeen[dep.tgt.a] = struct{}{}
 805                         }
 806                         for _, dep := range depInfo.ifcreates {
 807                                 if _, exists := ifchangeSeen[dep.a]; exists {
 808                                         tracef(CWarn, "simultaneous ifcreate and ifchange records: %s", tgt)
 809                                 }
 810                         }
 811                 } else if errors.Is(err, fs.ErrNotExist) {
 812                         err = nil
 813                 } else {
 814                         err = ErrLine(err)
 815                         goto Finish
 816                 }
 817
 818         Finish:
 819                 runErr.Err = err
 820                 errs <- runErr
 821         }()
 822         return nil
 823 }
 824
 825 func isOkRun(err error) bool {
 826         if err == nil {
 827                 return true
 828         }
 829         var runErr RunError
 830         if errors.As(err, &runErr) && runErr.Err == nil {
 831                 tracef(CRedo, "%s", runErr.Name())
 832                 return true
 833         }
 834         tracef(CErr, "%s", err)
 835         return false
 836 }