main.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 package main
  19
  20 import (
  21         "bufio"
  22         "bytes"
  23         "crypto/rand"
  24         "errors"
  25         "flag"
  26         "fmt"
  27         "io"
  28         "io/ioutil"
  29         "log"
  30         "os"
  31         "os/signal"
  32         "path"
  33         "path/filepath"
  34         "runtime"
  35         "sort"
  36         "strconv"
  37         "syscall"
  38
  39         "go.cypherpunks.ru/recfile"
  40         "golang.org/x/sys/unix"
  41 )
  42
  43 const (
  44         CmdNameGoredo       = "goredo"
  45         CmdNameRedo         = "redo"
  46         CmdNameRedoAffects  = "redo-affects"
  47         CmdNameRedoAlways   = "redo-always"
  48         CmdNameRedoCleanup  = "redo-cleanup"
  49         CmdNameRedoDot      = "redo-dot"
  50         CmdNameRedoIfchange = "redo-ifchange"
  51         CmdNameRedoIfcreate = "redo-ifcreate"
  52         CmdNameRedoLog      = "redo-log"
  53         CmdNameRedoOOD      = "redo-ood"
  54         CmdNameRedoSources  = "redo-sources"
  55         CmdNameRedoStamp    = "redo-stamp"
  56         CmdNameRedoTargets  = "redo-targets"
  57         CmdNameRedoWhichdo  = "redo-whichdo"
  58         CmdNameRedoDepFix   = "redo-depfix"
  59 )
  60
  61 var (
  62         Cwd       string
  63         BuildUUID string
  64         IsTopRedo bool // is it the top redo instance
  65 )
  66
  67 func mustSetenv(key string) {
  68         if err := os.Setenv(key, "1"); err != nil {
  69                 panic(err)
  70         }
  71 }
  72
  73 func mustParseFd(v, name string) *os.File {
  74         ptr, err := strconv.ParseUint(v, 10, 64)
  75         if err != nil {
  76                 panic(err)
  77         }
  78         fd := os.NewFile(uintptr(ptr), name)
  79         if fd == nil {
  80                 panic("can not parse fd: " + name)
  81         }
  82         return fd
  83 }
  84
  85 func CmdName() string {
  86         return path.Base(os.Args[0])
  87 }
  88
  89 func main() {
  90         version := flag.Bool("version", false, "print version")
  91         warranty := flag.Bool("warranty", false, "print warranty information")
  92
  93         var symlinks *bool
  94         cmdName := CmdName()
  95         if cmdName == "goredo" {
  96                 symlinks = flag.Bool("symlinks", false, "create necessary symlinks in current directory")
  97         }
  98
  99         flag.Usage = func() { usage(os.Args[0]) }
 100         flag.Parse()
 101         if *warranty {
 102                 fmt.Println(Warranty)
 103                 return
 104         }
 105         if *version {
 106                 fmt.Println("goredo", Version, "built with", runtime.Version())
 107                 return
 108         }
 109         if cmdName == CmdNameGoredo && *symlinks {
 110                 rc := 0
 111                 for _, cmdName := range []string{
 112                         CmdNameRedo,
 113                         CmdNameRedoAffects,
 114                         CmdNameRedoAlways,
 115                         CmdNameRedoCleanup,
 116                         CmdNameRedoDepFix,
 117                         CmdNameRedoDot,
 118                         CmdNameRedoIfchange,
 119                         CmdNameRedoIfcreate,
 120                         CmdNameRedoLog,
 121                         CmdNameRedoOOD,
 122                         CmdNameRedoSources,
 123                         CmdNameRedoStamp,
 124                         CmdNameRedoTargets,
 125                         CmdNameRedoWhichdo,
 126                 } {
 127                         fmt.Println(os.Args[0], "<-", cmdName)
 128                         if err := os.Symlink(os.Args[0], cmdName); err != nil {
 129                                 rc = 1
 130                                 log.Println(err)
 131                         }
 132                 }
 133                 os.Exit(rc)
 134         }
 135         log.SetFlags(log.Lshortfile)
 136
 137         var err error
 138         Cwd, err = os.Getwd()
 139         if err != nil {
 140                 log.Fatalln(err)
 141         }
 142
 143         TopDir = os.Getenv(EnvTopDir)
 144         if TopDir == "" {
 145                 TopDir = "/"
 146         } else {
 147                 TopDir, err = filepath.Abs(TopDir)
 148                 if err != nil {
 149                         panic(err)
 150                 }
 151         }
 152         DirPrefix = os.Getenv(EnvDirPrefix)
 153         DepCwd = os.Getenv(EnvDepCwd)
 154
 155         if flagStderrKeep != nil && *flagStderrKeep {
 156                 mustSetenv(EnvStderrKeep)
 157         }
 158         if flagStderrSilent != nil && *flagStderrSilent {
 159                 mustSetenv(EnvStderrSilent)
 160         }
 161         if flagNoProgress != nil && *flagNoProgress {
 162                 mustSetenv(EnvNoProgress)
 163         }
 164         if flagDebug != nil && *flagDebug {
 165                 mustSetenv(EnvDebug)
 166         }
 167         if flagLogWait != nil && *flagLogWait {
 168                 mustSetenv(EnvLogWait)
 169         }
 170         if flagLogLock != nil && *flagLogLock {
 171                 mustSetenv(EnvLogLock)
 172         }
 173         if flagLogPid != nil && *flagLogPid {
 174                 mustSetenv(EnvLogPid)
 175         }
 176         if flagLogJS != nil && *flagLogJS {
 177                 mustSetenv(EnvLogJS)
 178         }
 179         StderrKeep = os.Getenv(EnvStderrKeep) == "1"
 180         StderrSilent = os.Getenv(EnvStderrSilent) == "1"
 181         NoProgress = os.Getenv(EnvNoProgress) == "1"
 182         Debug = os.Getenv(EnvDebug) == "1"
 183         LogWait = os.Getenv(EnvLogWait) == "1"
 184         LogLock = os.Getenv(EnvLogLock) == "1"
 185         LogJS = os.Getenv(EnvLogJS) == "1"
 186         if Debug || os.Getenv(EnvLogPid) == "1" {
 187                 MyPid = os.Getpid()
 188         }
 189         var traced bool
 190         if flagTraceAll != nil && *flagTraceAll {
 191                 mustSetenv(EnvTrace)
 192         }
 193         if os.Getenv(EnvTrace) == "1" {
 194                 TracedAll = true
 195                 traced = true
 196         } else if flagTrace != nil {
 197                 traced = *flagTrace
 198         }
 199         NoColor = os.Getenv(EnvNoColor) != ""
 200         NoSync = os.Getenv(EnvNoSync) == "1"
 201         switch s := os.Getenv(EnvInodeTrust); s {
 202         case "none":
 203                 InodeTrust = InodeTrustNone
 204         case "", "ctime":
 205                 InodeTrust = InodeTrustCtime
 206         case "mtime":
 207                 InodeTrust = InodeTrustMtime
 208         default:
 209                 log.Fatalln("unknown", EnvInodeTrust, "value")
 210         }
 211         tracef(CDebug, "inode-trust: %s", InodeTrust)
 212
 213         // Those are internal envs
 214         FdOODTgts, err = ioutil.TempFile("", "ood-tgts")
 215         if err != nil {
 216                 log.Fatalln(err)
 217         }
 218         if err = os.Remove(FdOODTgts.Name()); err != nil {
 219                 log.Fatalln(err)
 220         }
 221         FdOODTgtsLock, err = ioutil.TempFile("", "ood-tgts.lock")
 222         if err != nil {
 223                 log.Fatalln(err)
 224         }
 225         if err = os.Remove(FdOODTgtsLock.Name()); err != nil {
 226                 log.Fatalln(err)
 227         }
 228
 229         if v := os.Getenv(EnvOODTgtsFd); v != "" {
 230                 fd := mustParseFd(v, EnvOODTgtsFd)
 231                 fdLock := mustParseFd(v, EnvOODTgtsLockFd)
 232                 flock := unix.Flock_t{
 233                         Type:   unix.F_WRLCK,
 234                         Whence: io.SeekStart,
 235                 }
 236                 if err = unix.FcntlFlock(fdLock.Fd(), unix.F_SETLKW, &flock); err != nil {
 237                         log.Fatalln(err)
 238                 }
 239                 if _, err = fd.Seek(0, io.SeekStart); err != nil {
 240                         log.Fatalln(err)
 241                 }
 242                 tgtsRaw, err := ioutil.ReadAll(bufio.NewReader(fd))
 243                 if err != nil {
 244                         log.Fatalln(err)
 245                 }
 246                 flock.Type = unix.F_UNLCK
 247                 if err = unix.FcntlFlock(fdLock.Fd(), unix.F_SETLK, &flock); err != nil {
 248                         log.Fatalln(err)
 249                 }
 250                 OODTgts = map[string]struct{}{}
 251                 for _, tgtRaw := range bytes.Split(tgtsRaw, []byte{0}) {
 252                         t := string(tgtRaw)
 253                         if t == "" {
 254                                 continue
 255                         }
 256                         OODTgts[t] = struct{}{}
 257                         tracef(CDebug, "ood: known to be: %s", t)
 258                 }
 259         }
 260
 261         StderrPrefix = os.Getenv(EnvStderrPrefix)
 262         if v := os.Getenv(EnvLevel); v != "" {
 263                 Level, err = strconv.Atoi(v)
 264                 if err != nil {
 265                         panic(err)
 266                 }
 267                 if Level < 0 {
 268                         panic("negative " + EnvLevel)
 269                 }
 270         }
 271
 272         var fdDep *os.File
 273         if v := os.Getenv(EnvDepFd); v != "" {
 274                 fdDep = mustParseFd(v, EnvDepFd)
 275         }
 276
 277         tgts := flag.Args()
 278         BuildUUID = os.Getenv(EnvBuildUUID)
 279         tgtsWasEmpty := len(tgts) == 0
 280         if BuildUUID == "" {
 281                 IsTopRedo = true
 282                 raw := new([16]byte)
 283                 if _, err = io.ReadFull(rand.Reader, raw[:]); err != nil {
 284                         log.Fatalln(err)
 285                 }
 286                 raw[6] = (raw[6] & 0x0F) | uint8(4<<4) // version 4
 287                 BuildUUID = fmt.Sprintf(
 288                         "%x-%x-%x-%x-%x",
 289                         raw[0:4], raw[4:6], raw[6:8], raw[8:10], raw[10:],
 290                 )
 291                 if tgtsWasEmpty {
 292                         tgts = []string{"all"}
 293                 }
 294         }
 295
 296         if cmdName == CmdNameRedo || cmdName == CmdNameRedoIfchange {
 297                 statusInit()
 298         }
 299
 300         for i, tgt := range tgts {
 301                 if path.IsAbs(tgt) {
 302                         tgts[i] = cwdMustRel(tgt)
 303                 }
 304         }
 305
 306         killed := make(chan os.Signal, 1)
 307         signal.Notify(killed, syscall.SIGHUP, syscall.SIGINT, syscall.SIGTERM)
 308         go func() {
 309                 <-killed
 310                 tracef(CDebug, "[%s] killed", BuildUUID)
 311                 jsReleaseAll()
 312                 RunningProcsM.Lock()
 313                 for pid, proc := range RunningProcs {
 314                         tracef(CDebug, "[%s] killing child %d", BuildUUID, pid)
 315                         _ = proc.Signal(syscall.SIGTERM)
 316                 }
 317                 os.Exit(1)
 318         }()
 319
 320         ok := true
 321         err = nil
 322         tracef(
 323                 CDebug, "[%s] run: %s %s cwd:%s dirprefix:%s",
 324                 BuildUUID, cmdName, tgts, Cwd, DirPrefix,
 325         )
 326
 327 CmdSwitch:
 328         switch cmdName {
 329         case CmdNameRedo:
 330                 for _, tgt := range tgts {
 331                         ok, err = ifchange([]string{tgt}, true, traced)
 332                         if err != nil || !ok {
 333                                 break
 334                         }
 335                 }
 336         case CmdNameRedoIfchange:
 337                 ok, err = ifchange(tgts, false, traced)
 338                 if err == nil {
 339                         err = depsWrite(fdDep, tgts)
 340                 }
 341         case CmdNameRedoIfcreate:
 342                 if fdDep == nil {
 343                         log.Fatalln("no", EnvDepFd)
 344                 }
 345                 for _, tgt := range tgts {
 346                         tgtRel, err := filepath.Rel(
 347                                 path.Join(Cwd, DirPrefix),
 348                                 path.Join(Cwd, tgt),
 349                         )
 350                         if err != nil {
 351                                 break
 352                         }
 353                         err = ifcreate(fdDep, tgtRel)
 354                         if err != nil {
 355                                 break
 356                         }
 357                 }
 358         case CmdNameRedoAlways:
 359                 if fdDep == nil {
 360                         log.Fatalln("no", EnvDepFd)
 361                 }
 362                 err = always(fdDep)
 363         case CmdNameRedoCleanup:
 364                 for _, what := range tgts {
 365                         err = cleanupWalker(Cwd, what)
 366                         if err != nil {
 367                                 break
 368                         }
 369                 }
 370         case CmdNameRedoDot:
 371                 err = dotPrint(tgts)
 372         case CmdNameRedoStamp:
 373                 if fdDep == nil {
 374                         log.Fatalln("no", EnvDepFd)
 375                 }
 376                 err = stamp(fdDep, os.Stdin)
 377         case CmdNameRedoLog:
 378                 if len(tgts) != 1 {
 379                         log.Fatalln("single target expected")
 380                 }
 381                 d, t := cwdAndTgt(tgts[0])
 382                 err = showBuildLog(d, t, nil, 0)
 383         case CmdNameRedoWhichdo:
 384                 if len(tgts) != 1 {
 385                         log.Fatalln("single target expected")
 386                 }
 387                 var fdTmp *os.File
 388                 fdTmp, err = ioutil.TempFile("", "whichdo")
 389                 if err != nil {
 390                         break
 391                 }
 392                 if err = os.Remove(fdTmp.Name()); err != nil {
 393                         break
 394                 }
 395                 cwd, tgt := cwdAndTgt(tgts[0])
 396                 doFile, upLevels, err := findDo(fdTmp, cwd, tgt)
 397                 if err != nil {
 398                         break
 399                 }
 400                 _, err = fdTmp.Seek(0, io.SeekStart)
 401                 if err != nil {
 402                         break
 403                 }
 404                 r := recfile.NewReader(fdTmp)
 405                 for {
 406                         m, err := r.NextMap()
 407                         if err != nil {
 408                                 if errors.Is(err, io.EOF) {
 409                                         break
 410                                 }
 411                                 break CmdSwitch
 412                         }
 413                         fmt.Println(cwdMustRel(cwd, m["Target"]))
 414                 }
 415                 if doFile == "" {
 416                         ok = false
 417                 } else {
 418                         p := make([]string, 0, upLevels+2)
 419                         p = append(p, cwd)
 420                         for i := 0; i < upLevels; i++ {
 421                                 p = append(p, "..")
 422                         }
 423                         p = append(p, doFile)
 424                         rel, err := filepath.Rel(Cwd, path.Join(p...))
 425                         if err != nil {
 426                                 panic(err)
 427                         }
 428                         fmt.Println(rel)
 429                 }
 430         case CmdNameRedoTargets:
 431                 if tgtsWasEmpty {
 432                         tgts = []string{Cwd}
 433                 }
 434                 tgts, err = targetsWalker(tgts)
 435                 if err != nil {
 436                         break
 437                 }
 438                 sort.Strings(tgts)
 439                 for _, tgt := range tgts {
 440                         fmt.Println(tgt)
 441                 }
 442         case CmdNameRedoAffects:
 443                 if tgtsWasEmpty {
 444                         log.Fatalln("no targets specified")
 445                 }
 446                 var tgtsKnown []string
 447                 tgtsKnown, err = targetsWalker([]string{Cwd})
 448                 if err != nil {
 449                         break
 450                 }
 451                 deps := map[string]map[string]struct{}{}
 452                 for _, tgt := range tgtsKnown {
 453                         collectDeps(Cwd, tgt, 0, deps, true)
 454                 }
 455                 seen := map[string]struct{}{}
 456                 for _, tgt := range tgts {
 457                         collectWholeDeps(deps[tgt], deps, seen)
 458                 }
 459                 tgts := make([]string, 0, len(seen))
 460                 for dep := range seen {
 461                         tgts = append(tgts, dep)
 462                 }
 463                 sort.Strings(tgts)
 464                 for _, dep := range tgts {
 465                         fmt.Println(dep)
 466                 }
 467         case CmdNameRedoOOD:
 468                 if tgtsWasEmpty {
 469                         tgts, err = targetsWalker([]string{Cwd})
 470                         if err != nil {
 471                                 break
 472                         }
 473                 }
 474                 sort.Strings(tgts)
 475                 var ood bool
 476                 for _, tgt := range tgts {
 477                         ood, err = isOOD(Cwd, tgt, 0, nil)
 478                         if err != nil {
 479                                 break
 480                         }
 481                         if ood {
 482                                 fmt.Println(tgt)
 483                         }
 484                 }
 485         case CmdNameRedoSources:
 486                 if tgtsWasEmpty {
 487                         tgts, err = targetsWalker([]string{Cwd})
 488                         if err != nil {
 489                                 break
 490                         }
 491                 }
 492                 sort.Strings(tgts)
 493                 var srcs []string
 494                 srcs, err = sourcesWalker(tgts)
 495                 sort.Strings(srcs)
 496                 for _, src := range srcs {
 497                         fmt.Println(src)
 498                 }
 499         case CmdNameRedoDepFix:
 500                 err = depFix(Cwd)
 501         default:
 502                 log.Fatalln("unknown command", cmdName)
 503         }
 504         if err != nil {
 505                 log.Println(err)
 506         }
 507         rc := 0
 508         if !ok || err != nil {
 509                 rc = 1
 510         }
 511         tracef(CDebug, "[%s] finished: %s %s", BuildUUID, cmdName, tgts)
 512         os.Exit(rc)
 513 }