/*
goredo -- djb's redo implementation on pure Go
-Copyright (C) 2020-2021 Sergey Matveev <stargrave@stargrave.org>
+Copyright (C) 2020-2023 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
package main
import (
+ "bytes"
"errors"
"fmt"
"io"
+ "io/fs"
"log"
"os"
"path"
- "path/filepath"
"strings"
"golang.org/x/sys/unix"
OODTgts map[string]struct{}
FdOODTgts *os.File
FdOODTgtsLock *os.File
+
+ OODCache = make(map[string]bool)
+ FileExistsCache = make(map[string]bool)
+
+ ErrMissingTarget = errors.New("invalid format of .rec: missing Target")
)
-type TgtErr struct {
+func FileExists(p string) bool {
+ if exists, known := FileExistsCache[p]; known {
+ return exists
+ }
+ _, err := os.Stat(p)
+ if err == nil {
+ FileExistsCache[p] = true
+ return true
+ }
+ if errors.Is(err, fs.ErrNotExist) {
+ FileExistsCache[p] = false
+ }
+ return false
+}
+
+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)
}
-func cwdMustRel(paths ...string) string {
- rel, err := filepath.Rel(Cwd, path.Join(paths...))
- if err != nil {
- panic(err)
- }
- return rel
-}
-
-func cwdAndTgt(tgt string) (string, string) {
- cwd, tgt := path.Split(tgt)
- cwd, err := filepath.Abs(cwd)
- if err != nil {
- panic(err)
- }
- return cwd, tgt
-}
-
func isSrc(cwd, tgt string) bool {
d, f := path.Split(path.Join(cwd, tgt))
- if _, err := os.Stat(path.Join(d, f)); err != nil {
+ if !FileExists(path.Join(d, f)) {
return false
}
- if _, err := os.Stat(path.Join(d, f+".do")); err == nil {
+ if FileExists(path.Join(d, f+".do")) {
return false
}
- if _, err := os.Stat(path.Join(d, RedoDir, f+DepSuffix)); err == nil {
+ if FileExists(path.Join(d, RedoDir, f+DepSuffix)) {
return false
}
return true
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 true
- }
- depInfo, err := depRead(fdDep)
- fdDep.Close()
- if err != nil || depInfo.build != BuildUUID {
- return true
- }
- return false
+ build, err := depReadBuild(depPath)
+ return err != nil || build != BuildUUID
}
func isOOD(cwd, tgtOrig string, level int, seen map[string]struct{}) (bool, error) {
indent := strings.Repeat(". ", level)
- trace(CDebug, "ood: %s%s checking", indent, tgtOrig)
+ 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 {
- trace(CDebug, "ood: %s%s -> no dep: %s", indent, tgtOrig, depPath)
- return true, nil
+ ood, cached := OODCache[path.Join(cwd, tgt)]
+ if cached {
+ tracef(CDebug, "ood: %s%s -> cached: %v", indent, tgtOrig, ood)
+ return ood, nil
}
- depInfo, err := depRead(fdDep)
- fdDep.Close()
+ depPath := path.Join(cwd, RedoDir, tgt+DepSuffix)
+ depInfo, err := depRead(depPath)
if err != nil {
- return true, TgtErr{tgtOrig, err}
+ if errors.Is(err, fs.ErrNotExist) {
+ if isSrc(cwd, tgt) {
+ ood = false
+ tracef(CDebug, "ood: %s%s -> is source", indent, tgtOrig)
+ } else {
+ ood = true
+ tracef(CDebug, "ood: %s%s -> no dep: %s", indent, tgtOrig, depPath)
+ }
+ OODCache[path.Join(cwd, tgt)] = ood
+ return ood, nil
+ }
+ if err != nil {
+ return true, TgtError{tgtOrig, ErrLine(err)}
+ }
}
if depInfo.build == BuildUUID {
- trace(CDebug, "ood: %s%s -> already built", indent, tgtOrig)
+ tracef(CDebug, "ood: %s%s -> already built", indent, tgtOrig)
+ OODCache[path.Join(cwd, tgt)] = false
return false, nil
}
- if _, err := os.Stat(path.Join(cwd, tgt)); err != nil && os.IsNotExist(err) {
- trace(CDebug, "ood: %s%s -> non-existent", indent, tgtOrig)
+ if !FileExists(path.Join(cwd, tgt)) {
+ tracef(CDebug, "ood: %s%s -> non-existent", indent, tgtOrig)
+ OODCache[path.Join(cwd, tgt)] = true
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)
+ if FileExists(path.Join(cwd, dep)) {
+ tracef(CDebug, "ood: %s%s -> %s created", indent, tgtOrig, dep)
ood = true
goto Done
}
}
- for _, m := range depInfo.ifchanges {
- dep := m["Target"]
- if dep == "" {
- return ood, TgtErr{tgtOrig, errors.New("invalid format of .rec: missing Target")}
+ for _, dep := range depInfo.ifchanges {
+ if dep.tgt == "" {
+ return ood, TgtError{tgtOrig, ErrMissingTarget}
}
- theirInode, err := inodeFromRec(m)
- if err != nil {
- return ood, TgtErr{tgtOrig, fmt.Errorf("invalid format of .rec: %w", err)}
+ tracef(CDebug, "ood: %s%s -> %s: checking", indent, tgtOrig, dep.tgt)
+ ood, cached = OODCache[path.Join(cwd, dep.tgt)]
+ if cached {
+ tracef(CDebug, "ood: %s%s -> %s: cached: %v", indent, tgtOrig, dep.tgt, ood)
+ if ood {
+ goto Done
+ }
+ continue
}
- theirHsh := m["Hash"]
- trace(CDebug, "ood: %s%s -> %s: checking", indent, tgtOrig, dep)
- fd, err := os.Open(path.Join(cwd, dep))
+ inode, err := inodeFromFileByPath(path.Join(cwd, dep.tgt))
if err != nil {
- if os.IsNotExist(err) {
- trace(CDebug, "ood: %s%s -> %s: not exists", indent, tgtOrig, dep)
+ if errors.Is(err, fs.ErrNotExist) {
+ tracef(CDebug, "ood: %s%s -> %s: not exists", indent, tgtOrig, dep.tgt)
ood = true
+ OODCache[path.Join(cwd, dep.tgt)] = ood
goto Done
}
- return ood, TgtErr{tgtOrig, err}
+ return ood, TgtError{tgtOrig, ErrLine(err)}
}
- defer fd.Close()
- inode, err := inodeFromFile(fd)
- if err != nil {
- return ood, TgtErr{tgtOrig, err}
- }
- if inode.Size != theirInode.Size {
- trace(CDebug, "ood: %s%s -> %s: size differs", indent, tgtOrig, dep)
+ if inode.Size != dep.inode.Size {
+ tracef(CDebug, "ood: %s%s -> %s: size differs", indent, tgtOrig, dep.tgt)
ood = true
+ OODCache[path.Join(cwd, dep.tgt)] = ood
goto Done
}
- if InodeTrust && inode.Equals(theirInode) {
- trace(CDebug, "ood: %s%s -> %s: same inode", indent, tgtOrig, dep)
+ if InodeTrust != InodeTrustNone && inode.Equals(dep.inode) {
+ tracef(CDebug, "ood: %s%s -> %s: same inode", indent, tgtOrig, dep.tgt)
} else {
- trace(CDebug, "ood: %s%s -> %s: inode differs", indent, tgtOrig, dep)
+ tracef(CDebug, "ood: %s%s -> %s: inode differs", indent, tgtOrig, dep.tgt)
+ fd, err := os.Open(path.Join(cwd, dep.tgt))
+ if err != nil {
+ return ood, TgtError{tgtOrig, ErrLine(err)}
+ }
hsh, err := fileHash(fd)
+ fd.Close()
if err != nil {
- return ood, TgtErr{tgtOrig, err}
+ return ood, TgtError{tgtOrig, ErrLine(err)}
}
- if theirHsh != hsh {
- trace(CDebug, "ood: %s%s -> %s: hash differs", indent, tgtOrig, dep)
+ if !bytes.Equal(dep.hash, hsh) {
+ tracef(CDebug, "ood: %s%s -> %s: hash differs", indent, tgtOrig, dep.tgt)
ood = true
+ OODCache[path.Join(cwd, dep.tgt)] = ood
goto Done
}
- trace(CDebug, "ood: %s%s -> %s: same hash", indent, tgtOrig, dep)
+ tracef(CDebug, "ood: %s%s -> %s: same hash", indent, tgtOrig, dep.tgt)
}
- fd.Close() // optimization not to hold it for long
- if dep == tgt {
- trace(CDebug, "ood: %s%s -> %s: same target", indent, tgtOrig, dep)
+ if dep.tgt == tgt {
+ tracef(CDebug, "ood: %s%s -> %s: same target", indent, tgtOrig, dep.tgt)
continue
}
- if isSrc(cwd, dep) {
- trace(CDebug, "ood: %s%s -> %s: is source", indent, tgtOrig, dep)
+ if isSrc(cwd, dep.tgt) {
+ tracef(CDebug, "ood: %s%s -> %s: is source", indent, tgtOrig, dep.tgt)
+ OODCache[path.Join(cwd, dep.tgt)] = false
continue
}
- if _, ok := seen[cwdMustRel(cwd, dep)]; ok {
- trace(CDebug, "ood: %s%s -> %s: was always built", indent, tgtOrig, dep)
+ if _, ok := seen[cwdMustRel(cwd, dep.tgt)]; ok {
+ tracef(CDebug, "ood: %s%s -> %s: was always built", indent, tgtOrig, dep.tgt)
+ OODCache[path.Join(cwd, dep.tgt)] = false
continue
}
- depOod, err := isOODWithTrace(cwd, dep, level+1, seen)
+ depOOD, err := isOODWithTrace(cwd, dep.tgt, 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)
+ if depOOD {
+ tracef(CDebug, "ood: %s%s -> %s: ood", indent, tgtOrig, dep.tgt)
ood = true
goto Done
}
- trace(CDebug, "ood: %s%s -> %s: !ood", indent, tgtOrig, dep)
+ tracef(CDebug, "ood: %s%s -> %s: !ood", indent, tgtOrig, dep.tgt)
}
Done:
- trace(CDebug, "ood: %s%s: %v", indent, tgtOrig, ood)
+ tracef(CDebug, "ood: %s%s: %v", indent, tgtOrig, ood)
+ OODCache[path.Join(cwd, tgt)] = ood
return ood, nil
}
level int,
seen map[string]struct{},
) (bool, error) {
- p, err := filepath.Abs(path.Join(cwd, tgtOrig))
- if err != nil {
- panic(err)
- }
+ p := mustAbs(path.Join(cwd, tgtOrig))
_, ood := OODTgts[p]
+ var err error
if ood {
if !isOODByBuildUUID(cwd, tgtOrig) {
- trace(
+ tracef(
CDebug,
"ood: %s%s -> already built",
strings.Repeat(". ", level), tgtOrig,
)
return false, nil
}
- trace(
+ tracef(
CDebug,
"ood: %s%s true, external decision",
strings.Repeat(". ", level), tgtOrig,
return ood, err
}
RecordOODTgt:
- if err = unix.Flock(int(FdOODTgtsLock.Fd()), unix.LOCK_EX); err != nil {
- log.Fatalln(err)
+ flock := unix.Flock_t{
+ Type: unix.F_WRLCK,
+ Whence: io.SeekStart,
+ }
+ if err = unix.FcntlFlock(FdOODTgtsLock.Fd(), unix.F_SETLKW, &flock); err != nil {
+ log.Fatal(err)
}
if _, err = FdOODTgts.Seek(0, io.SeekEnd); err != nil {
- log.Fatalln(err)
+ log.Fatal(err)
}
if _, err := FdOODTgts.WriteString(p + "\x00"); err != nil {
- log.Fatalln(err)
+ log.Fatal(err)
+ }
+ flock.Type = unix.F_UNLCK
+ if err = unix.FcntlFlock(FdOODTgtsLock.Fd(), unix.F_SETLK, &flock); err != nil {
+ log.Fatal(err)
}
- unix.Flock(int(FdOODTgtsLock.Fd()), unix.LOCK_UN)
return true, nil
}
func oodTgtsClear() {
- if err := unix.Flock(int(FdOODTgtsLock.Fd()), unix.LOCK_EX); err != nil {
- log.Fatalln(err)
+ var err error
+ flock := unix.Flock_t{
+ Type: unix.F_WRLCK,
+ Whence: io.SeekStart,
+ }
+ if err = unix.FcntlFlock(FdOODTgtsLock.Fd(), unix.F_SETLKW, &flock); err != nil {
+ log.Fatal(err)
+ }
+ if err = FdOODTgts.Truncate(0); err != nil {
+ log.Fatal(err)
}
- if err := FdOODTgts.Truncate(0); err != nil {
- log.Fatalln(err)
+ flock.Type = unix.F_UNLCK
+ if err = unix.FcntlFlock(FdOODTgtsLock.Fd(), unix.F_SETLK, &flock); err != nil {
+ log.Fatal(err)
}
- unix.Flock(int(FdOODTgtsLock.Fd()), unix.LOCK_UN)
}