checkpoint; still broken

main.go

@@ -8,6 +8,8 @@ import "github.com/sirupsen/logrus"
 import "github.com/multiformats/go-multihash"
 import "github.com/mr-tron/base58"
 import "github.com/pkg/xattr"
+
+//import "errors"
 import "os"
 import "io"
 import "flag"
@@ -58,13 +60,33 @@ func xsum() int {
 	}
 	switch flag.Arg(0) {
 	case "cron":
-		return xsfCheckAndUpdate(paths)
+		x := xsfCheckAndUpdate(paths)
+		if x != nil {
+			return -1
+		} else {
+			return 0
+		}
 	case "check-and-update":
-		return xsfCheckAndUpdate(paths)
+		x := xsfCheckAndUpdate(paths)
+		if x != nil {
+			return -1
+		} else {
+			return 0
+		}
 	case "check":
-		return xsfCheck(paths)
+		x := xsfCheck(paths)
+		if x != nil {
+			return -1
+		} else {
+			return 0
+		}
 	case "update":
-		return xsfUpdate(paths)
+		x := xsfUpdate(paths)
+		if x != nil {
+			return -1
+		} else {
+			return 0
+		}
 	default:
 		usage()
 		return -1
@@ -76,33 +98,40 @@ func usage() {
 	flag.PrintDefaults()
 }
 
-func xsfCheck(paths []string) int {
+func xsfCheck(paths []string) error {
 	log.Debugf("check")
 	log.Fatalf("not implemented")
-	return 0
+	for _, path := range paths {
+		x := newXsf(path)
+		err := x.Check()
+		if err != nil {
+			return err
+		}
+	}
+	return nil
 }
 
 func showError(e error) {
 	fmt.Fprintf(os.Stderr, "error: %s\n", e)
 }
 
-func xsfUpdate(paths []string) int {
+func xsfUpdate(paths []string) error {
 	log.Debugf("update")
 	for _, path := range paths {
 		x := newXsf(path)
 		err := x.Update()
 		if err != nil {
 			showError(err)
-			return -1
+			return err
 		}
 	}
-	return 0
+	return nil
 }
 
-func xsfCheckAndUpdate(paths []string) int {
+func xsfCheckAndUpdate(paths []string) error {
 	log.Debugf("check-and-update")
 	r := xsfCheck(paths)
-	if r != 0 {
+	if r != nil {
 		return r
 	}
 	return xsfUpdate(paths)
@@ -131,7 +160,7 @@ func HashFile(fp *os.File) (string, error) {
 type xsf struct {
 	fi        *os.FileInfo
 	fp        *os.File
-	hash  string
+	multihash string
 	mtime     string
 	path      string
 	size      int64
@@ -141,21 +170,30 @@ type xsf struct {
 // constructor
 /////////////////////////////////////////////////////////////////////////////////
 
-type xsf struct {
-	fi    *os.FileInfo
-	fp    *os.File
-	hash  string
-	mtime string
-	path  string
-	size  int64
-}
-
 func newXsf(path string) *xsf {
 	x := xsf{}
 	x.path = path
 	return &x
 }
 
+func (x *xsf) readXattrs(fp *os.File) error {
+	log.Infof("reading xattrs")
+	var xn string
+	var err error
+	var v []byte
+
+	xn = fmt.Sprintf("%s.%s", namespacePrefix, "mtime")
+	v, err = xattr.FGet(x.fp, xn)
+
+	xn = fmt.Sprintf("%s.%s", namespacePrefix, "size")
+	v, err = xattr.FGet(x.fp, xn)
+
+	xn = fmt.Sprintf("%s.%s", namespacePrefix, "multihash")
+	v, err = xattr.FGet(x.fp, xn)
+
+	return nil //FIXME
+}
+
 func (x *xsf) writeXattrs(fp *os.File) error {
 	log.Infof("writing xattrs")
 
@@ -177,8 +215,8 @@ func (x *xsf) writeXattrs(fp *os.File) error {
 	}
 
 	xn = fmt.Sprintf("%s.%s", namespacePrefix, "multihash")
-	log.Infof("writing xattr %s=%s", xn, x.hash)
-	err = xattr.FSet(fp, xn, []byte(x.hash))
+	log.Infof("writing xattr %s=%s", xn, x.multihash)
+	err = xattr.FSet(fp, xn, []byte(x.multihash))
 	if err != nil {
 		return err
 	}
@@ -186,37 +224,60 @@ func (x *xsf) writeXattrs(fp *os.File) error {
 	return nil
 }
 
-func (x *xsf) Update() error {
-	fp, e1 := os.Open(x.path)
-	defer fp.Close()
-	log.Infof("updating file")
-	log.Debugf("path: %s", x.path)
-	if e1 != nil {
-		return e1
-	}
-
-	fi, e2 := fp.Stat()
-	if e2 != nil {
-		return e2
+func (x *xsf) stat(fp *os.File) error {
+	fi, err := fp.Stat()
+	if err != nil {
+		return err
 	}
 	x.size = fi.Size()
 	log.Debugf("size: %d", x.size)
 	t := fi.ModTime().UTC().Format(time.RFC3339)
 	log.Debugf("modtime: %s", t)
 	x.mtime = t
-
-	log.Debugf("hashing...")
-	h, e3 := HashFile(fp)
-	if e3 != nil {
-		return e3
+	return nil
 }
-	x.hash = h
-	log.Debugf("hash: %s", h)
 
-	e4 := x.writeXattrs(fp)
+func (x *xsf) hash(fp *os.File) error {
+	log.Debugf("hashing...")
+	var err error
+	if x.multihash, err = HashFile(fp); err != nil {
+		return err
+	}
+	log.Debugf("hash: %s", x.multihash)
+	return nil
+}
 
-	if e4 != nil {
-		return e4
+func (x *xsf) Check() error {
+	fp, err := os.Open(x.path)
+	defer fp.Close()
+	if err != nil {
+		return err
+	}
+	x.stat(x.fp)
+	return nil
+}
+
+func (x *xsf) Update() error {
+	fp, err := os.Open(x.path)
+	defer fp.Close()
+	log.Debugf("updating file (path: %s)", x.path)
+	if err != nil {
+		return err
+	}
+
+	//FIXME check if size/mtime are defined first
+	//and skip update if match (and key 'multihash' exists)
+
+	if err = x.stat(fp); err != nil {
+		return err
+	}
+
+	if err = x.hash(fp); err != nil {
+		return err
+	}
+
+	if err = x.writeXattrs(fp); err != nil {
+		return err
 	}
 
 	return nil