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      string
 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
 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, cwd, tgt string) (
 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 != tgt {
 144                         continue
 145                 }
 146                 ourInode, err = inodeFromFileByPath(path.Join(cwd, tgt))
 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(tgtOrig string, errs chan error, forced, traced bool) error {
 173         cwd, tgt := cwdAndTgt(tgtOrig)
 174         redoDir := path.Join(cwd, RedoDir)
 175         if err := mkdirs(redoDir); err != nil {
 176                 return TgtError{tgtOrig, ErrLine(err)}
 177         }
 178
 179         shCtx := fmt.Sprintf("sh: %s: cwd:%s", tgtOrig, cwd)
 180         jsToken := jsAcquire(shCtx)
 181         jsNeedsRelease := true
 182         defer func() {
 183                 if jsNeedsRelease {
 184                         jsRelease(shCtx, jsToken)
 185                 }
 186         }()
 187
 188         // Acquire lock
 189         fdLock, err := os.OpenFile(
 190                 path.Join(redoDir, tgt+LockSuffix),
 191                 os.O_WRONLY|os.O_TRUNC|os.O_CREATE,
 192                 os.FileMode(0666),
 193         )
 194         if err != nil {
 195                 return TgtError{tgtOrig, ErrLine(err)}
 196         }
 197         flock := unix.Flock_t{
 198                 Type:   unix.F_WRLCK,
 199                 Whence: io.SeekStart,
 200         }
 201         lockRelease := func() {
 202                 tracef(CLock, "LOCK_UN: %s", fdLock.Name())
 203                 flock.Type = unix.F_UNLCK
 204                 if err := unix.FcntlFlock(fdLock.Fd(), unix.F_SETLK, &flock); err != nil {
 205                         log.Fatalln(err, fdLock.Name())
 206                 }
 207                 fdLock.Close()
 208         }
 209         tracef(CLock, "LOCK_NB: %s", fdLock.Name())
 210
 211         // Waiting for job completion, already taken by someone else
 212         if err = unix.FcntlFlock(fdLock.Fd(), unix.F_SETLK, &flock); err != nil {
 213                 if uintptr(err.(syscall.Errno)) != uintptr(unix.EAGAIN) {
 214                         fdLock.Close()
 215                         return TgtError{tgtOrig, ErrLine(err)}
 216                 }
 217                 Jobs.Add(1)
 218                 if err = unix.FcntlFlock(fdLock.Fd(), unix.F_GETLK, &flock); err != nil {
 219                         log.Fatalln(err, fdLock.Name())
 220                 }
 221                 tracef(CDebug, "waiting: %s (pid=%d)", tgtOrig, flock.Pid)
 222                 if FdStatus != nil {
 223                         if _, err = FdStatus.Write([]byte{StatusWait}); err != nil {
 224                                 log.Fatal(err)
 225                         }
 226                 }
 227                 go func() {
 228                         defer Jobs.Done()
 229                         tracef(CLock, "LOCK_EX: %s", fdLock.Name())
 230                 LockAgain:
 231                         if err := unix.FcntlFlock(fdLock.Fd(), unix.F_SETLKW, &flock); err != nil {
 232                                 if errors.Is(err, unix.EDEADLK) {
 233                                         time.Sleep(10 * time.Millisecond)
 234                                         goto LockAgain
 235                                 }
 236                                 log.Fatalln(err, fdLock.Name())
 237                         }
 238                         lockRelease()
 239                         tracef(CDebug, "waiting done: %s", tgtOrig)
 240                         if FdStatus != nil {
 241                                 if _, err = FdStatus.Write([]byte{StatusWaited}); err != nil {
 242                                         log.Fatal(err)
 243                                 }
 244                         }
 245                         build, err := depReadBuild(path.Join(redoDir, tgt+DepSuffix))
 246                         if err == nil {
 247                                 if build != BuildUUID {
 248                                         err = errors.New("was not built: build differs")
 249                                 }
 250                         } else {
 251                                 if errors.Is(err, fs.ErrNotExist) {
 252                                         err = errors.New("was not built: no .rec")
 253                                 }
 254                         }
 255                         if err != nil {
 256                                 err = TgtError{tgtOrig, err}
 257                         }
 258                         errs <- err
 259                 }()
 260                 return nil
 261         }
 262
 263         // It scans the whole .rec file while searching for the single target,
 264         // but that one is always located at the very end
 265         depInfo, err := depRead(path.Join(redoDir, tgt+DepSuffix))
 266         if err != nil {
 267                 if errors.Is(err, fs.ErrNotExist) {
 268                         err = nil
 269                 } else {
 270                         lockRelease()
 271                         return TgtError{tgtOrig, err}
 272                 }
 273         }
 274
 275         // Check if it was already built in parallel
 276         if !forced && depInfo != nil && depInfo.build == BuildUUID {
 277                 lockRelease()
 278                 errs <- nil
 279                 return nil
 280         }
 281
 282         // Check if target is not modified externally
 283         modified, inodePrev, hshPrev, err := isModified(depInfo, cwd, tgt)
 284         if err != nil {
 285                 lockRelease()
 286                 return TgtError{tgtOrig, err}
 287         }
 288         if modified {
 289                 lockRelease()
 290                 if StopIfMod {
 291                         return fmt.Errorf("%s externally modified", tgtOrig)
 292                 }
 293                 tracef(CWarn, "%s externally modified: not redoing", tgtOrig)
 294                 go func() {
 295                         errs <- nil
 296                 }()
 297                 return nil
 298         }
 299         depInfo = nil
 300
 301         // Start preparing .rec
 302         fdDep, err := tempfile(redoDir, tgt+DepSuffix)
 303         if err != nil {
 304                 lockRelease()
 305                 return TgtError{tgtOrig, ErrLine(err)}
 306         }
 307         fdDepOpened := true
 308         fdDepPath := fdDep.Name()
 309         cleanup := func() {
 310                 lockRelease()
 311                 if fdDepOpened {
 312                         fdDep.Close()
 313                 }
 314                 os.Remove(fdDep.Name())
 315         }
 316         if _, err = recfile.NewWriter(fdDep).WriteFields(
 317                 recfile.Field{Name: "Build", Value: BuildUUID},
 318         ); err != nil {
 319                 cleanup()
 320                 return TgtError{tgtOrig, ErrLine(err)}
 321         }
 322
 323         // Find .do
 324         doFile, upLevels, err := findDo(fdDep, cwd, tgt)
 325         if err != nil {
 326                 cleanup()
 327                 return TgtError{tgtOrig, ErrLine(err)}
 328         }
 329         if doFile == "" {
 330                 cleanup()
 331                 return TgtError{tgtOrig, errors.New("no .do found")}
 332         }
 333
 334         // Determine basename and DIRPREFIX
 335         doFileRelPath := doFile
 336         ents := strings.Split(cwd, "/")
 337         ents = ents[len(ents)-upLevels:]
 338         dirPrefix := path.Join(ents...)
 339         cwdOrig := cwd
 340         for i := 0; i < upLevels; i++ {
 341                 cwd = path.Join(cwd, "..")
 342                 doFileRelPath = path.Join("..", doFileRelPath)
 343         }
 344         cwd = path.Clean(cwd)
 345         doFilePath := path.Join(cwd, doFile)
 346         basename := tgt
 347         runErr := RunError{Tgt: tgtOrig}
 348         if strings.HasPrefix(doFile, "default.") {
 349                 basename = tgt[:len(tgt)-(len(doFile)-len("default.")-len(".do"))-1]
 350                 runErr.DoFile = doFileRelPath
 351         }
 352
 353         if err = depWrite(fdDep, cwdOrig, doFileRelPath, nil); err != nil {
 354                 cleanup()
 355                 return TgtError{tgtOrig, ErrLine(err)}
 356         }
 357         fdDep.Close()
 358         fdDepOpened = false
 359         tracef(CWait, "%s", runErr.Name())
 360
 361         // Prepare command line
 362         var cmdName string
 363         var args []string
 364         if err = unix.Access(doFilePath, unix.X_OK); err == nil {
 365                 cmdName = doFilePath
 366                 args = make([]string, 0, 3)
 367         } else {
 368                 cmdName = "/bin/sh"
 369                 if traced || TracedAll {
 370                         args = append(args, "-ex")
 371                 } else {
 372                         args = append(args, "-e")
 373                 }
 374                 args = append(args, doFile)
 375         }
 376
 377         // Temporary file for stdout
 378         fdStdout, err := tempfile(cwdOrig, tgt)
 379         if err != nil {
 380                 cleanup()
 381                 return TgtError{tgtOrig, ErrLine(err)}
 382         }
 383         stdoutPath := fdStdout.Name()
 384         fdStdout.Close()
 385         tmpPath := stdoutPath + ".3" // and for $3
 386         tmpPathRel := mustRel(cwd, tmpPath)
 387         args = append(
 388                 args,
 389                 path.Join(dirPrefix, tgt),
 390                 path.Join(dirPrefix, basename),
 391                 tmpPathRel,
 392         )
 393         shCtx = fmt.Sprintf(
 394                 "sh: %s: %s %s cwd:%s dirprefix:%s",
 395                 tgtOrig, cmdName, args, cwd, dirPrefix,
 396         )
 397
 398         cmd := exec.Command(cmdName, args...)
 399         cmd.Dir = cwd
 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))
 404
 405         childStderrPrefixRaw := make([]byte, 8)
 406         if _, err = io.ReadFull(rand.Reader, childStderrPrefixRaw); err != nil {
 407                 panic(err)
 408         }
 409         childStderrPrefix := hex.EncodeToString(childStderrPrefixRaw)
 410         cmd.Env = append(cmd.Env, fmt.Sprintf(
 411                 "%s=%s", EnvStderrPrefix, childStderrPrefix,
 412         ))
 413
 414         fdNum := 0
 415         cmd.ExtraFiles = append(cmd.ExtraFiles, FdOODTgts)
 416         cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%d", EnvOODTgtsFd, 3+fdNum))
 417         fdNum++
 418         cmd.ExtraFiles = append(cmd.ExtraFiles, FdOODTgtsLock)
 419         cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%d", EnvOODTgtsLockFd, 3+fdNum))
 420         fdNum++
 421
 422         if FdStatus == nil {
 423                 cmd.Env = append(cmd.Env, fmt.Sprintf("%s=NO", EnvStatusFd))
 424         } else {
 425                 cmd.ExtraFiles = append(cmd.ExtraFiles, FdStatus)
 426                 cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%d", EnvStatusFd, 3+fdNum))
 427                 fdNum++
 428         }
 429
 430         // Preparing stderr
 431         var fdStderr *os.File
 432         if StderrKeep {
 433                 fdStderr, err = os.OpenFile(
 434                         path.Join(redoDir, tgt+LogSuffix),
 435                         os.O_WRONLY|os.O_CREATE|os.O_TRUNC,
 436                         os.FileMode(0666),
 437                 )
 438                 if err != nil {
 439                         cleanup()
 440                         return TgtError{tgtOrig, ErrLine(err)}
 441                 }
 442         }
 443         tracef(CDebug, "%s", shCtx)
 444
 445         jsNeedsRelease = false
 446         Jobs.Add(1)
 447         go func() {
 448                 if JSR == nil {
 449                         // infinite jobs
 450                         cmd.Env = append(cmd.Env, fmt.Sprintf("%s=NO", EnvJobs))
 451                 } else {
 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,
 456                         )
 457                         makeFlags = strings.Trim(makeFlags, " ")
 458                         cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%s", MakeFlagsName, makeFlags))
 459                         fdNum += 2
 460                         cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%d", EnvJSToken, jsToken))
 461                 }
 462
 463                 if FdStatus != nil {
 464                         if _, err = FdStatus.Write([]byte{StatusRun}); err != nil {
 465                                 log.Fatal(err)
 466                         }
 467                 }
 468
 469                 defer jsRelease(shCtx, jsToken)
 470
 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))
 476                 if err != nil {
 477                         if fdStderr != nil {
 478                                 fdStderr.Close()
 479                         }
 480                         runErr.Err = err
 481                         errs <- runErr
 482                         return
 483                 }
 484                 cmd.Stdout = fdStdout
 485                 fdDep, err = os.OpenFile(fdDepPath, os.O_WRONLY|os.O_APPEND, os.FileMode(0666))
 486                 if err != nil {
 487                         if fdStderr != nil {
 488                                 fdStderr.Close()
 489                         }
 490                         fdStdout.Close()
 491                         runErr.Err = err
 492                         errs <- runErr
 493                         return
 494                 }
 495                 fdDepOpened = true
 496                 cmd.ExtraFiles = append(cmd.ExtraFiles, fdDep)
 497                 cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%d", EnvDepFd, 3+fdNum))
 498                 fdNum++
 499                 cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%s", EnvDepCwd, cwd))
 500
 501                 defer func() {
 502                         if fdDepOpened {
 503                                 fdDep.Close()
 504                         }
 505                         fdStdout.Close()
 506                         if fdStderr != nil {
 507                                 fdStderr.Close()
 508                                 logRecPath := path.Join(redoDir, tgt+LogRecSuffix)
 509                                 if fdStderr, err = os.OpenFile(
 510                                         logRecPath,
 511                                         os.O_WRONLY|os.O_CREATE|os.O_TRUNC,
 512                                         os.FileMode(0666),
 513                                 ); err == nil {
 514                                         fields := []recfile.Field{
 515                                                 {Name: "Build", Value: BuildUUID},
 516                                                 {Name: "PPID", Value: strconv.Itoa(os.Getpid())},
 517                                                 {Name: "Cwd", Value: cwd},
 518                                         }
 519                                         if cmd.Process != nil {
 520                                                 fields = append(fields, recfile.Field{
 521                                                         Name: "PID", Value: strconv.Itoa(cmd.Process.Pid),
 522                                                 })
 523                                         }
 524                                         ts := new(tai64n.TAI64N)
 525                                         ts.FromTime(started)
 526                                         fields = append(fields,
 527                                                 recfile.Field{Name: "Started", Value: tai64n.Encode(ts[:])},
 528                                         )
 529                                         ts.FromTime(finished)
 530                                         fields = append(fields,
 531                                                 recfile.Field{Name: "Finished", Value: tai64n.Encode(ts[:])})
 532                                         fields = append(fields, recfile.Field{
 533                                                 Name:  "Duration",
 534                                                 Value: strconv.FormatInt(finished.Sub(started).Nanoseconds(), 10),
 535                                         })
 536                                         fields = append(fields, recfile.Field{Name: "Cmd", Value: cmdName})
 537                                         for _, arg := range args {
 538                                                 fields = append(fields, recfile.Field{Name: "Arg", Value: arg})
 539                                         }
 540                                         for _, env := range cmd.Env {
 541                                                 fields = append(fields, recfile.Field{Name: "Env", Value: env})
 542                                         }
 543                                         if exitErr != nil {
 544                                                 fields = append(fields, recfile.Field{
 545                                                         Name:  "ExitCode",
 546                                                         Value: strconv.Itoa(exitErr.ProcessState.ExitCode()),
 547                                                 })
 548                                         }
 549                                         w := bufio.NewWriter(fdStderr)
 550
 551                                         depInfo, err := depRead(fdDepPath)
 552                                         if err != nil {
 553                                                 err = ErrLine(err)
 554                                                 goto Err
 555                                         }
 556                                         for _, dep := range depInfo.ifchanges {
 557                                                 fields = append(fields, recfile.Field{
 558                                                         Name:  "Ifchange",
 559                                                         Value: dep.tgt,
 560                                                 })
 561                                         }
 562                                         _, err = recfile.NewWriter(w).WriteFields(fields...)
 563                                         if err != nil {
 564                                                 err = ErrLine(err)
 565                                                 goto Err
 566                                         }
 567                                         err = ErrLine(w.Flush())
 568                                 Err:
 569                                         if err != nil {
 570                                                 log.Print(err)
 571                                                 os.Remove(logRecPath)
 572                                         }
 573                                         fdStderr.Close()
 574                                 } else {
 575                                         log.Println("can not open", logRecPath, ":", err)
 576                                 }
 577                         }
 578                         lockRelease()
 579                         os.Remove(fdDep.Name())
 580                         os.Remove(fdStdout.Name())
 581                         os.Remove(tmpPath)
 582                         if FdStatus != nil {
 583                                 if _, err = FdStatus.Write([]byte{StatusDone}); err != nil {
 584                                         log.Fatal(err)
 585                                 }
 586                         }
 587                         Jobs.Done()
 588                 }()
 589                 stderr, err := cmd.StderrPipe()
 590                 if err != nil {
 591                         runErr.Err = err
 592                         errs <- runErr
 593                         return
 594                 }
 595                 started = time.Now()
 596                 err = cmd.Start()
 597                 if err != nil {
 598                         runErr.Err = err
 599                         errs <- runErr
 600                         return
 601                 }
 602                 RunningProcsM.Lock()
 603                 RunningProcs[cmd.Process.Pid] = cmd.Process
 604                 RunningProcsM.Unlock()
 605                 pid := fmt.Sprintf("[%d]", cmd.Process.Pid)
 606                 tracef(CDebug, "%s runs %s", tgtOrig, pid)
 607
 608                 stderrTerm := make(chan struct{})
 609                 go func() {
 610                         scanner := bufio.NewScanner(stderr)
 611                         var line string
 612                         ts := new(tai64n.TAI64N)
 613                         for scanner.Scan() {
 614                                 line = scanner.Text()
 615                                 if strings.HasPrefix(line, childStderrPrefix) {
 616                                         line = line[len(childStderrPrefix):]
 617                                         os.Stderr.WriteString(StderrPrefix + line + "\n")
 618                                         continue
 619                                 }
 620                                 if fdStderr != nil {
 621                                         ts.FromTime(time.Now())
 622                                         LogMutex.Lock()
 623                                         fmt.Fprintln(fdStderr, tai64n.Encode(ts[:]), line)
 624                                         LogMutex.Unlock()
 625                                 }
 626                                 if StderrSilent {
 627                                         continue
 628                                 }
 629                                 if MyPid == 0 {
 630                                         tracef(CNone, "%s", line)
 631                                 } else {
 632                                         tracef(CNone, "%s %s", pid, line)
 633                                 }
 634                         }
 635                         close(stderrTerm)
 636                 }()
 637
 638                 // Wait for job completion
 639                 <-stderrTerm
 640                 err = cmd.Wait()
 641                 RunningProcsM.Lock()
 642                 delete(RunningProcs, cmd.Process.Pid)
 643                 RunningProcsM.Unlock()
 644                 finished = time.Now()
 645                 runErr.Finished = &finished
 646                 if err != nil {
 647                         exitErr = err.(*exec.ExitError)
 648                         runErr.Err = err
 649                         errs <- runErr
 650                         return
 651                 }
 652
 653                 // Was $1 touched?
 654                 if inode, err := inodeFromFileByPath(path.Join(cwdOrig, tgt)); err == nil {
 655                         if inodePrev == nil {
 656                                 runErr.Err = Err1WasTouched
 657                                 errs <- runErr
 658                                 return
 659                         }
 660                         if err != nil {
 661                                 runErr.Err = err
 662                                 errs <- runErr
 663                                 return
 664                         }
 665                         if !inode.Equals(inodePrev) {
 666                                 runErr.Err = Err1WasTouched
 667                                 errs <- runErr
 668                                 return
 669                         }
 670                 }
 671
 672                 // Does it produce both stdout and tmp?
 673                 fiStdout, err := os.Stat(fdStdout.Name())
 674                 if err != nil {
 675                         runErr.Err = ErrLine(err)
 676                         errs <- runErr
 677                         return
 678                 }
 679                 tmpExists := false
 680                 _, err = os.Stat(tmpPath)
 681                 if err == nil {
 682                         if fiStdout.Size() > 0 {
 683                                 runErr.Err = errors.New("created both tmp and stdout")
 684                                 errs <- runErr
 685                                 return
 686                         }
 687                         tmpExists = true
 688                 } else if !errors.Is(err, fs.ErrNotExist) {
 689                         runErr.Err = ErrLine(err)
 690                         errs <- runErr
 691                         return
 692                 }
 693
 694                 // Determine what file we must process at last
 695                 var fd *os.File
 696                 if tmpExists {
 697                         fd, err = os.Open(tmpPath)
 698                         if err != nil {
 699                                 err = ErrLine(err)
 700                                 goto Finish
 701                         }
 702                         defer fd.Close()
 703                 } else if fiStdout.Size() > 0 {
 704                         fd = fdStdout
 705                 }
 706
 707                 // Do we need to ifcreate it, or ifchange with renaming?
 708                 if fd == nil {
 709                         os.Remove(path.Join(cwdOrig, tgt))
 710                         err = ifcreate(fdDep, tgt)
 711                         if err != nil {
 712                                 err = ErrLine(err)
 713                                 goto Finish
 714                         }
 715                 } else {
 716                         var hsh []byte
 717                         if hshPrev != nil {
 718                                 _, err = fd.Seek(0, io.SeekStart)
 719                                 if err != nil {
 720                                         err = ErrLine(err)
 721                                         goto Finish
 722                                 }
 723                                 hsh, err = fileHash(fd)
 724                                 if err != nil {
 725                                         err = ErrLine(err)
 726                                         goto Finish
 727                                 }
 728                                 if bytes.Equal(hsh, hshPrev) {
 729                                         tracef(CDebug, "%s has same hash, not renaming", tgtOrig)
 730                                         err = ErrLine(os.Remove(fd.Name()))
 731                                         if err != nil {
 732                                                 goto Finish
 733                                         }
 734                                         err = ErrLine(os.Chtimes(path.Join(cwdOrig, tgt), finished, finished))
 735                                         if err != nil {
 736                                                 goto Finish
 737                                         }
 738                                         if !NoSync {
 739                                                 err = ErrLine(syncDir(cwdOrig))
 740                                                 if err != nil {
 741                                                         goto Finish
 742                                                 }
 743                                         }
 744                                         err = ErrLine(depWrite(fdDep, cwdOrig, tgt, hsh))
 745                                         if err != nil {
 746                                                 goto Finish
 747                                         }
 748                                         goto RecCommit
 749                                 }
 750                         }
 751                         if !NoSync {
 752                                 err = ErrLine(fd.Sync())
 753                                 if err != nil {
 754                                         goto Finish
 755                                 }
 756                         }
 757                         err = ErrLine(os.Rename(fd.Name(), path.Join(cwdOrig, tgt)))
 758                         if err != nil {
 759                                 goto Finish
 760                         }
 761                         if !NoSync {
 762                                 err = ErrLine(syncDir(cwdOrig))
 763                                 if err != nil {
 764                                         goto Finish
 765                                 }
 766                         }
 767                         err = ErrLine(depWrite(fdDep, cwdOrig, tgt, hsh))
 768                         if err != nil {
 769                                 goto Finish
 770                         }
 771                 }
 772
 773         RecCommit:
 774                 // Commit .rec
 775                 if !NoSync {
 776                         err = ErrLine(fdDep.Sync())
 777                         if err != nil {
 778                                 goto Finish
 779                         }
 780                 }
 781                 fdDepPath = path.Join(redoDir, tgt+DepSuffix)
 782                 err = ErrLine(os.Rename(fdDep.Name(), fdDepPath))
 783                 if err != nil {
 784                         goto Finish
 785                 }
 786                 if !NoSync {
 787                         err = ErrLine(syncDir(redoDir))
 788                         if err != nil {
 789                                 goto Finish
 790                         }
 791                 }
 792                 fdDep.Close()
 793                 fdDepOpened = false
 794
 795                 // Post-commit .rec sanitizing
 796                 if depInfo, err := depRead(fdDepPath); err == nil {
 797                         ifchangeSeen := make(map[string]struct{}, len(depInfo.ifchanges))
 798                         for _, dep := range depInfo.ifchanges {
 799                                 ifchangeSeen[dep.tgt] = struct{}{}
 800                         }
 801                         for _, dep := range depInfo.ifcreates {
 802                                 if _, exists := ifchangeSeen[dep]; exists {
 803                                         tracef(CWarn, "simultaneous ifcreate and ifchange records: %s", tgt)
 804                                 }
 805                         }
 806                 } else if errors.Is(err, fs.ErrNotExist) {
 807                         err = nil
 808                 } else {
 809                         err = ErrLine(err)
 810                         goto Finish
 811                 }
 812
 813         Finish:
 814                 runErr.Err = err
 815                 errs <- runErr
 816         }()
 817         return nil
 818 }
 819
 820 func isOkRun(err error) bool {
 821         if err == nil {
 822                 return true
 823         }
 824         var runErr RunError
 825         if errors.As(err, &runErr) && runErr.Err == nil {
 826                 tracef(CRedo, "%s", runErr.Name())
 827                 return true
 828         }
 829         tracef(CErr, "%s", err)
 830         return false
 831 }