X-Git-Url: http://www.git.cypherpunks.ru/?a=blobdiff_plain;f=ood.go;h=cad1ce38f5f23f6beb1124749774a7d4111303ec;hb=ce96a1c785b32af13264225c0bf7ae8370a5af21;hp=e75dd43c4f7185dd17b7047d326414a6af9b89cd;hpb=ebd96d2c56c742d9d00bccb9faee5fc1a7db664a;p=goredo.git

diff --git a/ood.go b/ood.go
index e75dd43..cad1ce3 100644
--- a/ood.go
+++ b/ood.go
@@ -1,5 +1,5 @@
 /*
-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
@@ -26,6 +26,8 @@ import (
 	"path"
 	"path/filepath"
 	"strings"
+
+	"golang.org/x/sys/unix"
 )
 
 const (
@@ -33,6 +35,15 @@ 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 {
@@ -110,11 +121,11 @@ func isOOD(cwd, tgtOrig string, level int, seen map[string]struct{}) (bool, erro
 	for _, m := range depInfo.ifchanges {
 		dep := m["Target"]
 		if dep == "" {
-			return ood, TgtErr{tgtOrig, errors.New("invalid format of .dep: missing Target")}
+			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 .dep: %v", err)}
+			return ood, TgtErr{tgtOrig, fmt.Errorf("invalid format of .rec: %v", err)}
 		}
 		theirHsh := m["Hash"]
 		trace(CDebug, "ood: %s%s -> %s: checking", indent, tgtOrig, dep)
@@ -139,7 +150,7 @@ func isOOD(cwd, tgtOrig string, level int, seen map[string]struct{}) (bool, erro
 			ood = true
 			goto Done
 		}
-		if inode.Equals(theirInode) {
+		if InodeTrust && inode.Equals(theirInode) {
 			trace(CDebug, "ood: %s%s -> %s: same inode", indent, tgtOrig, dep)
 		} else {
 			trace(CDebug, "ood: %s%s -> %s: inode differs", indent, tgtOrig, dep)
@@ -170,7 +181,7 @@ func isOOD(cwd, tgtOrig string, level int, seen map[string]struct{}) (bool, erro
 			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}
 		}
@@ -186,3 +197,49 @@ Done:
 	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 {
+		panic(err)
+	}
+	if _, err = FdOODTgts.Seek(0, os.SEEK_END); err != nil {
+		panic(err)
+	}
+	if _, err := FdOODTgts.WriteString(p + "\x00"); err != nil {
+		panic(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 {
+		panic(err)
+	}
+	if err := FdOODTgts.Truncate(0); err != nil {
+		panic(err)
+	}
+	unix.Flock(int(FdOODTgtsLock.Fd()), unix.LOCK_UN)
+}