2 goredo -- djb's redo implementation on pure Go
3 Copyright (C) 2020-2022 Sergey Matveev <stargrave@stargrave.org>
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation, version 3 of the License.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>.
38 "go.cypherpunks.ru/recfile"
39 "golang.org/x/sys/unix"
43 CmdNameGoredo = "goredo"
45 CmdNameRedoAffects = "redo-affects"
46 CmdNameRedoAlways = "redo-always"
47 CmdNameRedoCleanup = "redo-cleanup"
48 CmdNameRedoDot = "redo-dot"
49 CmdNameRedoIfchange = "redo-ifchange"
50 CmdNameRedoIfcreate = "redo-ifcreate"
51 CmdNameRedoLog = "redo-log"
52 CmdNameRedoOOD = "redo-ood"
53 CmdNameRedoSources = "redo-sources"
54 CmdNameRedoStamp = "redo-stamp"
55 CmdNameRedoTargets = "redo-targets"
56 CmdNameRedoWhichdo = "redo-whichdo"
57 CmdNameRedoDepFix = "redo-depfix"
63 IsTopRedo bool // is it the top redo instance
67 func mustSetenv(key string) {
68 if err := os.Setenv(key, "1"); err != nil {
73 func mustParseFd(v, name string) *os.File {
74 ptr, err := strconv.ParseUint(v, 10, 64)
78 fd := os.NewFile(uintptr(ptr), name)
80 panic("can not parse fd: " + name)
85 func CmdName() string {
86 return path.Base(os.Args[0])
90 version := flag.Bool("version", false, "print version")
91 warranty := flag.Bool("warranty", false, "print warranty information")
95 if cmdName == "goredo" {
96 symlinks = flag.Bool("symlinks", false, "create necessary symlinks in current directory")
99 flag.Usage = func() { usage(os.Args[0]) }
102 fmt.Println(Warranty)
106 fmt.Println("goredo", Version, "built with", runtime.Version())
109 if cmdName == CmdNameGoredo && *symlinks {
111 for _, cmdName := range []string{
127 fmt.Println(os.Args[0], "<-", cmdName)
128 if err := os.Symlink(os.Args[0], cmdName); err != nil {
135 log.SetFlags(log.Lshortfile)
137 UmaskCur = syscall.Umask(0)
138 syscall.Umask(UmaskCur)
141 Cwd, err = os.Getwd()
146 TopDir = os.Getenv(EnvTopDir)
150 TopDir, err = filepath.Abs(TopDir)
155 DirPrefix = os.Getenv(EnvDirPrefix)
156 DepCwd = os.Getenv(EnvDepCwd)
158 if flagStderrKeep != nil && *flagStderrKeep {
159 mustSetenv(EnvStderrKeep)
161 if flagStderrSilent != nil && *flagStderrSilent {
162 mustSetenv(EnvStderrSilent)
164 if flagNoProgress != nil && *flagNoProgress {
165 mustSetenv(EnvNoProgress)
167 if flagDebug != nil && *flagDebug {
170 if flagLogWait != nil && *flagLogWait {
171 mustSetenv(EnvLogWait)
173 if flagLogLock != nil && *flagLogLock {
174 mustSetenv(EnvLogLock)
176 if flagLogPid != nil && *flagLogPid {
177 mustSetenv(EnvLogPid)
179 if flagLogJS != nil && *flagLogJS {
182 StderrKeep = os.Getenv(EnvStderrKeep) == "1"
183 StderrSilent = os.Getenv(EnvStderrSilent) == "1"
184 NoProgress = os.Getenv(EnvNoProgress) == "1"
185 Debug = os.Getenv(EnvDebug) == "1"
186 LogWait = os.Getenv(EnvLogWait) == "1"
187 LogLock = os.Getenv(EnvLogLock) == "1"
188 LogJS = os.Getenv(EnvLogJS) == "1"
189 if Debug || os.Getenv(EnvLogPid) == "1" {
193 if flagTraceAll != nil && *flagTraceAll {
196 if os.Getenv(EnvTrace) == "1" {
199 } else if flagTrace != nil {
202 NoColor = os.Getenv(EnvNoColor) != ""
203 NoSync = os.Getenv(EnvNoSync) == "1"
204 StopIfMod = os.Getenv(EnvStopIfMod) == "1"
205 switch s := os.Getenv(EnvInodeTrust); s {
207 InodeTrust = InodeTrustNone
209 InodeTrust = InodeTrustCtime
211 InodeTrust = InodeTrustMtime
213 log.Fatalln("unknown", EnvInodeTrust, "value")
215 tracef(CDebug, "inode-trust: %s", InodeTrust)
217 // Those are internal envs
218 FdOODTgts, err = os.CreateTemp("", "ood-tgts")
222 if err = os.Remove(FdOODTgts.Name()); err != nil {
225 FdOODTgtsLock, err = os.CreateTemp("", "ood-tgts.lock")
229 if err = os.Remove(FdOODTgtsLock.Name()); err != nil {
233 if v := os.Getenv(EnvOODTgtsFd); v != "" {
234 fd := mustParseFd(v, EnvOODTgtsFd)
235 fdLock := mustParseFd(v, EnvOODTgtsLockFd)
236 flock := unix.Flock_t{
238 Whence: io.SeekStart,
240 if err = unix.FcntlFlock(fdLock.Fd(), unix.F_SETLKW, &flock); err != nil {
243 if _, err = fd.Seek(0, io.SeekStart); err != nil {
246 tgtsRaw, err := io.ReadAll(bufio.NewReader(fd))
250 flock.Type = unix.F_UNLCK
251 if err = unix.FcntlFlock(fdLock.Fd(), unix.F_SETLK, &flock); err != nil {
254 OODTgts = map[string]struct{}{}
255 for _, tgtRaw := range bytes.Split(tgtsRaw, []byte{0}) {
260 OODTgts[t] = struct{}{}
261 tracef(CDebug, "ood: known to be: %s", t)
265 StderrPrefix = os.Getenv(EnvStderrPrefix)
266 if v := os.Getenv(EnvLevel); v != "" {
267 Level, err = strconv.Atoi(v)
272 panic("negative " + EnvLevel)
277 if v := os.Getenv(EnvDepFd); v != "" {
278 fdDep = mustParseFd(v, EnvDepFd)
282 BuildUUID = os.Getenv(EnvBuildUUID)
283 tgtsWasEmpty := len(tgts) == 0
287 if _, err = io.ReadFull(rand.Reader, raw[:]); err != nil {
290 raw[6] = (raw[6] & 0x0F) | uint8(4<<4) // version 4
291 BuildUUID = fmt.Sprintf(
293 raw[0:4], raw[4:6], raw[6:8], raw[8:10], raw[10:],
296 tgts = []string{"all"}
300 if cmdName == CmdNameRedo || cmdName == CmdNameRedoIfchange {
304 for i, tgt := range tgts {
306 tgts[i] = cwdMustRel(tgt)
310 killed := make(chan os.Signal, 1)
311 signal.Notify(killed, syscall.SIGHUP, syscall.SIGINT, syscall.SIGTERM)
314 tracef(CDebug, "[%s] killed", BuildUUID)
317 for pid, proc := range RunningProcs {
318 tracef(CDebug, "[%s] killing child %d", BuildUUID, pid)
319 _ = proc.Signal(syscall.SIGTERM)
327 CDebug, "[%s] run: %s %s cwd:%s dirprefix:%s",
328 BuildUUID, cmdName, tgts, Cwd, DirPrefix,
334 for _, tgt := range tgts {
335 ok, err = ifchange([]string{tgt}, true, traced)
336 if err != nil || !ok {
340 case CmdNameRedoIfchange:
341 ok, err = ifchange(tgts, *flagForcedIfchange, traced)
343 err = depsWrite(fdDep, tgts)
345 case CmdNameRedoIfcreate:
347 log.Fatalln("no", EnvDepFd)
349 for _, tgt := range tgts {
350 tgtRel, err := filepath.Rel(
351 path.Join(Cwd, DirPrefix),
357 err = ifcreate(fdDep, tgtRel)
362 case CmdNameRedoAlways:
364 log.Fatalln("no", EnvDepFd)
367 case CmdNameRedoCleanup:
368 for _, what := range tgts {
369 err = cleanupWalker(Cwd, what)
376 case CmdNameRedoStamp:
378 log.Fatalln("no", EnvDepFd)
380 err = stamp(fdDep, os.Stdin)
383 log.Fatalln("single target expected")
385 d, t := cwdAndTgt(tgts[0])
386 err = showBuildLog(d, t, nil, 0)
387 case CmdNameRedoWhichdo:
389 log.Fatalln("single target expected")
392 fdTmp, err = os.CreateTemp("", "whichdo")
396 if err = os.Remove(fdTmp.Name()); err != nil {
399 cwd, tgt := cwdAndTgt(tgts[0])
400 doFile, upLevels, err := findDo(fdTmp, cwd, tgt)
404 _, err = fdTmp.Seek(0, io.SeekStart)
408 r := recfile.NewReader(fdTmp)
410 m, err := r.NextMap()
412 if errors.Is(err, io.EOF) {
417 fmt.Println(cwdMustRel(cwd, m["Target"]))
422 p := make([]string, 0, upLevels+2)
424 for i := 0; i < upLevels; i++ {
427 p = append(p, doFile)
428 rel, err := filepath.Rel(Cwd, path.Join(p...))
434 case CmdNameRedoTargets:
438 tgts, err = targetsWalker(tgts)
443 for _, tgt := range tgts {
446 case CmdNameRedoAffects:
448 log.Fatalln("no targets specified")
450 var tgtsKnown []string
451 tgtsKnown, err = targetsWalker([]string{Cwd})
455 deps := map[string]map[string]struct{}{}
456 for _, tgt := range tgtsKnown {
457 collectDeps(Cwd, tgt, 0, deps, true)
459 seen := map[string]struct{}{}
460 for _, tgt := range tgts {
461 collectWholeDeps(deps[tgt], deps, seen)
463 tgts := make([]string, 0, len(seen))
464 for dep := range seen {
465 tgts = append(tgts, dep)
468 for _, dep := range tgts {
473 tgts, err = targetsWalker([]string{Cwd})
480 for _, tgt := range tgts {
481 ood, err = isOOD(Cwd, tgt, 0, nil)
489 case CmdNameRedoSources:
491 tgts, err = targetsWalker([]string{Cwd})
498 srcs, err = sourcesWalker(tgts)
500 for _, src := range srcs {
503 case CmdNameRedoDepFix:
506 log.Fatalln("unknown command", cmdName)
512 if !ok || err != nil {
515 tracef(CDebug, "[%s] finished: %s %s", BuildUUID, cmdName, tgts)