[GitHub] ccollins476ad commented on a change in pull request #68: MYNEWT-720; add 'newt resign-image' command.

[gi...@git.apache.org]

ccollins476ad commented on a change in pull request #68: MYNEWT-720; add 'newt resign-image' command.
URL: https://github.com/apache/incubator-mynewt-newt/pull/68#discussion_r121754133
 
 

 ##########
 File path: newt/image/image.go
 ##########
 @@ -361,6 +369,65 @@ func (image *Image) sigTlvType() uint8 {
 	}
 }
 
+func (image *Image) ReSign() error {
+	srcImg, err := os.Open(image.SourceImg)
+	if err != nil {
+		return util.NewNewtError(fmt.Sprintf("Can't open image file %s: %s",
+			image.SourceImg, err.Error()))
+	}
+
+	srcInfo, err := srcImg.Stat()
+	if err != nil {
+		return util.NewNewtError(fmt.Sprintf("Can't stat image file %s: %s",
+			image.SourceImg, err.Error()))
+	}
+
+	var hdr ImageHdr
+
+	err = binary.Read(srcImg, binary.LittleEndian, &hdr)
+	if err != nil {
+		return util.NewNewtError(fmt.Sprintf("Failing to access image %s: %s",
+			image.SourceImg, err.Error()))
+	}
+
+	if uint32(srcInfo.Size()) != uint32(hdr.HdrSz) + hdr.ImgSz + uint32(hdr.TlvSz) ||
+		hdr.Magic != IMAGE_MAGIC {
+
+		return util.NewNewtError(fmt.Sprintf("File %s is not an image\n",
+			image.SourceImg))
+	}
+	srcImg.Seek(int64(hdr.HdrSz), 0)
+
+	log.Debugf("Resigning %s (ver %d.%d.%d.%d)", image.SourceImg,
+		hdr.Vers.Major, hdr.Vers.Minor, hdr.Vers.Rev, hdr.Vers.BuildNum)
+
+        tmpBin, err := ioutil.TempFile("", "")
+	if err != nil {
+		return util.NewNewtError(fmt.Sprintf("Creating temp file failed: %s",
+			err.Error()))
+	}
+	tmpBinName := tmpBin.Name()
+//	defer os.Remove(tmpBinName)
 
 Review comment:
   It might be good to delete this commented-out line for clarity.
 
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