/*
-goredo -- redo implementation on pure Go
+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
import (
"errors"
"fmt"
+ "io"
+ "log"
"os"
"path"
"path/filepath"
"strings"
+
+ "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 {
trace(CDebug, "ood: %s%s -> already built", indent, tgtOrig)
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)
+ return true, nil
+ }
ood := false
for _, dep := range depInfo.ifcreates {
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, TgtErr{tgtOrig, errors.New("invalid format of .rec: missing Target")}
}
+ theirInode, err := inodeFromRec(m)
+ if err != nil {
+ return ood, TgtErr{tgtOrig, fmt.Errorf("invalid format of .rec: %w", err)}
+ }
+ theirHsh := m["Hash"]
trace(CDebug, "ood: %s%s -> %s: checking", indent, tgtOrig, dep)
fd, err := os.Open(path.Join(cwd, dep))
}
defer fd.Close()
- ts, err := fileCtime(fd)
+ inode, err := inodeFromFile(fd)
if err != nil {
return ood, TgtErr{tgtOrig, err}
}
- if theirTs == ts {
- trace(CDebug, "ood: %s%s -> %s: same ctime", indent, tgtOrig, dep)
+ if inode.Size != theirInode.Size {
+ trace(CDebug, "ood: %s%s -> %s: size differs", indent, tgtOrig, dep)
+ ood = true
+ goto Done
+ }
+ if InodeTrust && inode.Equals(theirInode) {
+ trace(CDebug, "ood: %s%s -> %s: same inode", indent, tgtOrig, dep)
} else {
- trace(CDebug, "ood: %s%s -> %s: ctime differs", indent, tgtOrig, dep)
+ trace(CDebug, "ood: %s%s -> %s: inode differs", indent, tgtOrig, dep)
hsh, err := fileHash(fd)
if err != nil {
return ood, TgtErr{tgtOrig, err}
continue
}
- depOod, err := isOOD(cwd, dep, level+1, seen)
+ depOod, err := isOODWithTrace(cwd, dep, level+1, seen)
if err != nil {
return ood, TgtErr{tgtOrig, err}
}
trace(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 {
+ trace(
+ 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)
+ }
+ 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)
+ }
+ if err := FdOODTgts.Truncate(0); err != nil {
+ log.Fatalln(err)
+ }
+ unix.Flock(int(FdOODTgtsLock.Fd()), unix.LOCK_UN)
+}