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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