/*
-goredo -- redo implementation on pure Go
-Copyright (C) 2020 Sergey Matveev <stargrave@stargrave.org>
+goredo -- djb's redo implementation on pure Go
+Copyright (C) 2020-2021 Sergey Matveev <stargrave@stargrave.org>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
"errors"
"fmt"
"io"
+ "log"
"os"
"path"
"path/filepath"
"strings"
- "go.cypherpunks.ru/recfile"
+ "golang.org/x/sys/unix"
)
const (
DepTypeIfchange = "ifchange"
DepTypeAlways = "always"
DepTypeStamp = "stamp"
+
+ EnvOODTgtsFd = "REDO_OOD_TGTS_FD"
+ EnvOODTgtsLockFd = "REDO_OOD_TGTS_LOCK_FD"
+)
+
+var (
+ OODTgts map[string]struct{}
+ FdOODTgts *os.File
+ FdOODTgtsLock *os.File
)
-type TgtErr struct {
+type TgtError struct {
Tgt string
Err error
}
-func (e TgtErr) Unwrap() error { return e.Err }
+func (e TgtError) Unwrap() error { return e.Err }
-func (e TgtErr) Error() string {
+func (e TgtError) Error() string {
return fmt.Sprintf("%s: %s", e.Tgt, e.Err)
}
if _, err := os.Stat(path.Join(d, f)); err != nil {
return false
}
+ if _, err := os.Stat(path.Join(d, f+".do")); err == nil {
+ return false
+ }
if _, err := os.Stat(path.Join(d, RedoDir, f+DepSuffix)); err == nil {
return false
}
return true
}
-type DepInfo struct {
- build string
- always bool
- stamp string
- stampSame bool
- ifcreates []string
- ifchanges []map[string]string
-}
-
-func depRead(fdDep *os.File) (*DepInfo, error) {
- r := recfile.NewReader(fdDep)
- m, err := r.NextMap()
+func isOODByBuildUUID(cwd, tgtOrig string) bool {
+ cwd, tgt := cwdAndTgt(path.Join(cwd, tgtOrig))
+ depPath := path.Join(cwd, RedoDir, tgt+DepSuffix)
+ fdDep, err := os.Open(depPath)
if err != nil {
- return nil, err
- }
- depInfo := DepInfo{}
- if b := m["Build"]; b == "" {
- return nil, errors.New(".dep missing Build:")
- } else {
- depInfo.build = b
+ return true
}
- for {
- m, err := r.NextMap()
- if err != nil {
- if err == io.EOF {
- break
- }
- return nil, err
- }
- switch m["Type"] {
- case DepTypeAlways:
- depInfo.always = true
- case DepTypeIfcreate:
- dep := m["Target"]
- if dep == "" {
- return nil, errors.New("invalid format of .dep")
- }
- depInfo.ifcreates = append(depInfo.ifcreates, dep)
- case DepTypeIfchange:
- delete(m, "Type")
- depInfo.ifchanges = append(depInfo.ifchanges, m)
- case DepTypeStamp:
- hsh := m["Hash"]
- if hsh == "" {
- return nil, errors.New("invalid format of .dep")
- }
- depInfo.stamp = hsh
- depInfo.stampSame = m["Same"] == "true"
- default:
- return nil, errors.New("invalid format of .dep")
- }
+ depInfo, err := depRead(fdDep)
+ fdDep.Close()
+ if err != nil || depInfo.build != BuildUUID {
+ return true
}
- return &depInfo, nil
+ return false
}
-func rebuildStamped(cwd, tgt, depPath, stampPrev string) (bool, error) {
- relTgt := cwdMustRel(cwd, tgt)
- errs := make(chan error, 1)
- if err := runScript(relTgt, errs, stampPrev); err != nil {
- return false, err
- }
- if err := <-errs; !isOkRun(err) {
- return false, errors.New("build failed")
- }
+func isOOD(cwd, tgtOrig string, level int, seen map[string]struct{}) (bool, error) {
+ indent := strings.Repeat(". ", level)
+ tracef(CDebug, "ood: %s%s checking", indent, tgtOrig)
+ cwd, tgt := cwdAndTgt(path.Join(cwd, tgtOrig))
+ depPath := path.Join(cwd, RedoDir, tgt+DepSuffix)
fdDep, err := os.Open(depPath)
if err != nil {
- return false, err
+ tracef(CDebug, "ood: %s%s -> no dep: %s", indent, tgtOrig, depPath)
+ return true, nil
}
- defer fdDep.Close()
depInfo, err := depRead(fdDep)
+ fdDep.Close()
if err != nil {
- return false, err
- }
- if depInfo.build != BuildUUID {
- return false, errors.New("is not built")
- }
- return depInfo.stampSame, nil
-}
-
-func formDepPath(cwd, tgt string) string {
- cwd, tgt = cwdAndTgt(path.Join(cwd, tgt))
- return path.Join(cwd, RedoDir, tgt+DepSuffix)
-}
-
-func isOOD(cwd, tgtOrig string, level int, depInfo *DepInfo) (bool, error) {
- indent := strings.Repeat(". ", level)
- trace(CDebug, "ood: %s%s checking", indent, tgtOrig)
- cwd, tgt := cwdAndTgt(path.Join(cwd, tgtOrig))
- depPath := formDepPath(cwd, tgt)
- if depInfo == nil {
- fdDep, err := os.Open(depPath)
- if err != nil {
- trace(CDebug, "ood: %s%s -> no dep: %s", indent, tgtOrig, depPath)
- return true, nil
- }
- defer fdDep.Close()
- depInfo, err = depRead(fdDep)
- if err != nil {
- return true, TgtErr{tgtOrig, err}
- }
+ return true, TgtError{tgtOrig, err}
}
if depInfo.build == BuildUUID {
- trace(CDebug, "ood: %s%s -> already built", indent, tgtOrig)
+ tracef(CDebug, "ood: %s%s -> already built", indent, tgtOrig)
return false, nil
}
- ood := depInfo.always
- if ood {
- goto StampCheck
+ if _, err := os.Stat(path.Join(cwd, tgt)); err != nil && os.IsNotExist(err) {
+ tracef(CDebug, "ood: %s%s -> non-existent", indent, tgtOrig)
+ return true, nil
}
+ ood := false
for _, dep := range depInfo.ifcreates {
if _, err := os.Stat(path.Join(cwd, dep)); err == nil {
- trace(CDebug, "ood: %s%s -> %s created", indent, tgtOrig, dep)
+ tracef(CDebug, "ood: %s%s -> %s created", indent, tgtOrig, dep)
ood = true
- goto StampCheck
+ goto Done
}
}
for _, m := range depInfo.ifchanges {
dep := m["Target"]
- theirTs := m["Ctime"]
- theirHsh := m["Hash"]
- if dep == "" || theirTs == "" {
- return ood, TgtErr{tgtOrig, errors.New("invalid format of .dep")}
+ if dep == "" {
+ return ood, TgtError{tgtOrig, errors.New("invalid format of .rec: missing Target")}
+ }
+ theirInode, err := inodeFromRec(m)
+ if err != nil {
+ return ood, TgtError{tgtOrig, fmt.Errorf("invalid format of .rec: %w", err)}
}
- trace(CDebug, "ood: %s%s -> %s: checking", indent, tgtOrig, dep)
+ theirHsh := m["Hash"]
+ tracef(CDebug, "ood: %s%s -> %s: checking", indent, tgtOrig, dep)
fd, err := os.Open(path.Join(cwd, dep))
if err != nil {
if os.IsNotExist(err) {
- trace(CDebug, "ood: %s%s -> %s: not exists", indent, tgtOrig, dep)
+ tracef(CDebug, "ood: %s%s -> %s: not exists", indent, tgtOrig, dep)
ood = true
- goto StampCheck
+ goto Done
}
- return ood, TgtErr{tgtOrig, err}
+ return ood, TgtError{tgtOrig, err}
}
defer fd.Close()
- var depDepInfo *DepInfo
- if !(dep == tgt || isSrc(cwd, dep)) {
- trace(CDebug, "ood: %s%s -> %s: prereading .dep", indent, tgtOrig, dep)
- depFdDep, err := os.Open(formDepPath(cwd, dep))
- if err != nil {
- return ood, TgtErr{path.Join(tgtOrig, dep), err}
- }
- defer depFdDep.Close()
- depDepInfo, err = depRead(depFdDep)
- if err != nil {
- return ood, TgtErr{path.Join(tgtOrig, dep), err}
- }
+ inode, err := inodeFromFile(fd)
+ if err != nil {
+ return ood, TgtError{tgtOrig, err}
}
-
- if depDepInfo != nil && depDepInfo.build == BuildUUID {
- trace(
- CDebug, "ood: %s%s -> %s: .dep says build is same",
- indent, tgtOrig, dep,
- )
- if !depDepInfo.stampSame {
- trace(
- CDebug, "ood: %s%s -> %s: .dep says stamp is not same",
- indent, tgtOrig, dep,
- )
- ood = true
- return ood, nil
- }
- trace(
- CDebug, "ood: %s%s -> %s: .dep says stamp is same",
- indent, tgtOrig, dep,
- )
- continue
+ if inode.Size != theirInode.Size {
+ tracef(CDebug, "ood: %s%s -> %s: size differs", indent, tgtOrig, dep)
+ ood = true
+ goto Done
}
-
- if depDepInfo == nil || !depDepInfo.always && depDepInfo.stamp == "" {
- ts, err := fileCtime(fd)
+ if InodeTrust && inode.Equals(theirInode) {
+ tracef(CDebug, "ood: %s%s -> %s: same inode", indent, tgtOrig, dep)
+ } else {
+ tracef(CDebug, "ood: %s%s -> %s: inode differs", indent, tgtOrig, dep)
+ hsh, err := fileHash(fd)
if err != nil {
- return ood, TgtErr{tgtOrig, err}
+ return ood, TgtError{tgtOrig, err}
}
- if theirTs == ts {
- trace(CDebug, "ood: %s%s -> %s: same ctime", indent, tgtOrig, dep)
- } else if NoHash || theirHsh == "" {
- trace(CDebug, "ood: %s%s -> %s: ctime differs", indent, tgtOrig, dep)
+ if theirHsh != hsh {
+ tracef(CDebug, "ood: %s%s -> %s: hash differs", indent, tgtOrig, dep)
ood = true
- goto StampCheck
- } else {
- hsh, err := fileHash(fd)
- if err != nil {
- return ood, TgtErr{tgtOrig, err}
- }
- if theirHsh != hsh {
- trace(CDebug, "ood: %s%s -> %s: hash differs", indent, tgtOrig, dep)
- ood = true
- goto StampCheck
- }
- trace(CDebug, "ood: %s%s -> %s: same hash", indent, tgtOrig, dep)
+ goto Done
}
+ tracef(CDebug, "ood: %s%s -> %s: same hash", indent, tgtOrig, dep)
}
+ fd.Close() // optimization not to hold it for long
if dep == tgt {
- trace(CDebug, "ood: %s%s -> %s: same target", indent, tgtOrig, dep)
+ tracef(CDebug, "ood: %s%s -> %s: same target", indent, tgtOrig, dep)
continue
}
if isSrc(cwd, dep) {
- trace(CDebug, "ood: %s%s -> %s: is source", indent, tgtOrig, dep)
+ tracef(CDebug, "ood: %s%s -> %s: is source", indent, tgtOrig, dep)
continue
}
- depOod, err := isOOD(cwd, dep, level+1, depDepInfo)
+ if _, ok := seen[cwdMustRel(cwd, dep)]; ok {
+ tracef(CDebug, "ood: %s%s -> %s: was always built", indent, tgtOrig, dep)
+ continue
+ }
+
+ depOod, err := isOODWithTrace(cwd, dep, level+1, seen)
if err != nil {
- return ood, TgtErr{tgtOrig, err}
+ return ood, TgtError{tgtOrig, err}
}
if depOod {
- trace(CDebug, "ood: %s%s -> %s: ood", indent, tgtOrig, dep)
+ tracef(CDebug, "ood: %s%s -> %s: ood", indent, tgtOrig, dep)
ood = true
- goto StampCheck
+ goto Done
}
- trace(CDebug, "ood: %s%s -> %s: !ood", indent, tgtOrig, dep)
+ tracef(CDebug, "ood: %s%s -> %s: !ood", indent, tgtOrig, dep)
}
-StampCheck:
- if ood && depInfo.stamp != "" {
- trace(CDebug, "ood: %s%s run, because stamped", indent, tgtOrig)
- stampSame, err := rebuildStamped(cwd, tgt, depPath, depInfo.stamp)
- if err != nil {
- return true, TgtErr{tgtOrig, err}
+Done:
+ tracef(CDebug, "ood: %s%s: %v", indent, tgtOrig, ood)
+ return ood, nil
+}
+
+func isOODWithTrace(
+ cwd, tgtOrig string,
+ level int,
+ seen map[string]struct{},
+) (bool, error) {
+ p, err := filepath.Abs(path.Join(cwd, tgtOrig))
+ if err != nil {
+ panic(err)
+ }
+ _, ood := OODTgts[p]
+ if ood {
+ if !isOODByBuildUUID(cwd, tgtOrig) {
+ tracef(
+ CDebug,
+ "ood: %s%s -> already built",
+ strings.Repeat(". ", level), tgtOrig,
+ )
+ return false, nil
}
- trace(CDebug, "ood: %s%s -> stamp: same: %v", indent, tgtOrig, stampSame)
- ood = !stampSame
+ tracef(
+ CDebug,
+ "ood: %s%s true, external decision",
+ strings.Repeat(". ", level), tgtOrig,
+ )
+ goto RecordOODTgt
+ }
+ ood, err = isOOD(cwd, tgtOrig, level, seen)
+ if !ood {
+ return ood, err
+ }
+RecordOODTgt:
+ if err = unix.Flock(int(FdOODTgtsLock.Fd()), unix.LOCK_EX); err != nil {
+ log.Fatalln(err)
+ }
+ if _, err = FdOODTgts.Seek(0, io.SeekEnd); err != nil {
+ log.Fatalln(err)
+ }
+ if _, err := FdOODTgts.WriteString(p + "\x00"); err != nil {
+ log.Fatalln(err)
+ }
+ if err = unix.Flock(int(FdOODTgtsLock.Fd()), unix.LOCK_UN); err != nil {
+ log.Fatalln(err)
+ }
+ return true, nil
+}
+
+func oodTgtsClear() {
+ var err error
+ if err = unix.Flock(int(FdOODTgtsLock.Fd()), unix.LOCK_EX); err != nil {
+ log.Fatalln(err)
+ }
+ if err = FdOODTgts.Truncate(0); err != nil {
+ log.Fatalln(err)
+ }
+ if err = unix.Flock(int(FdOODTgtsLock.Fd()), unix.LOCK_UN); err != nil {
+ log.Fatalln(err)
}
- trace(CDebug, "ood: %s%s: %v", indent, tgtOrig, ood)
- return ood, nil
}