releasetools: Support generating verify packages.

We can generate a special OTA package that verifies all the partitions
(boot, recovery, system, vendor and etc) on a device. It also calls
device-specific script to verify bootloader and radio images. This
ensures a flashed device contains all the desired images faithfully.

Usage:
ota_from_target_files.py --gen_verify target_files.zip output.zip

Bug: 24679956
Change-Id: Ib3091d98c4b17a6fad305b3edf16d09efbda5c38

tools/releasetools/edify_generator.py

@@ -152,6 +152,15 @@ class EdifyGenerator(object):
         "".join([', "%s"' % (i,) for i in sha1]) +
         ') || abort("\\"%s\\" has unexpected contents.");' % (filename,))
 
+  def Verify(self, filename):
+    """Check that the given file (or MTD reference) has one of the
+    given hashes (encoded in the filename)."""
+    self.script.append(
+        'apply_patch_check("{filename}") && '
+        'ui_print("    Verified.") || '
+        'ui_print("\\"{filename}\\" has unexpected contents.");'.format(
+            filename=filename))
+
   def FileCheck(self, filename, *sha1):
     """Check that the given file (or MTD reference) has one of the
     given *sha1 hashes."""