live: add checksum field to image/create response

Report image checksum to ogserver through HTTP response.

src/live/ogOperations.py

@@ -157,15 +157,20 @@ class OgLiveOperations:
                 m.update(buf)
         return m.hexdigest()
 
-    def _write_md5_file(self, path):
+    def _md5_file(self, path):
+        if not os.path.exists(path):
+            raise OgError(f'Failed to calculate checksum, image file {path} does not exist')
+
+        return self._compute_md5(path)
+
+    def _write_md5_file(self, path, checksum):
         if not os.path.exists(path):
             raise OgError(f'Failed to calculate checksum, image file {path} does not exist')
 
         filename = path + ".full.sum"
-        dig = self._compute_md5(path)
         try:
             with open(filename, 'w') as f:
-                f.write(dig)
+                f.write(checksum)
         except:
             logging.error(f'Cannot write checksum {filename}')
             return -1
@@ -585,9 +590,15 @@ class OgLiveOperations:
         logging.info(f'Writing checksum file {name}.img.full.sum...')
         logging.info('*DO NOT REBOOT OR POWEROFF* the client during this time')
 
-        if self._write_md5_file(f'/opt/opengnsys/images/{name}.img') == -1:
+        checksum = self._md5_file(f'/opt/opengnsys/images/{name}.img')
+        if checksum == -1:
+            raise OgError(f'Cannot access {name}.full.sum file')
+
+        if self._write_md5_file(f'/opt/opengnsys/images/{name}.img', checksum) == -1:
             raise OgError(f'Cannot write {name}.full.sum file')
 
+        image_info.checksum = checksum
+
         self._restartBrowser(self._url)
 
         logging.info('Image creation command OK')

src/ogRest.py

@@ -209,6 +209,7 @@ class ogThread():
 		json_body.add_element('size', image_info.size)
 		json_body.add_element('perms', image_info.perms)
 		json_body.add_element('lastupdate', image_info.mtime)
+		json_body.add_element('checksum', image_info.checksum)
 
 		response = restResponse(ogResponses.OK, json_body, seq=client.seq)
 		client.send(response.get())

src/utils/image.py

@@ -32,6 +32,7 @@ class ImageInfo:
         self.perms = 0
         self.clonator = 'PARTCLONE'
         self.compressor = 'LZOP'
+        self.checksum = 0
 
 
 def human_to_kb(size, unit):