add device-specific hooks at start of OTA phases

Change-Id: I47534e6d40e7918ee8cb9e87d76d9030b9273708

tools/releasetools/common.py

@@ -660,6 +660,10 @@ class DeviceSpecificParams(object):
     assertions they like."""
     return self._DoCall("FullOTA_Assertions")
 
+  def FullOTA_InstallBegin(self):
+    """Called at the start of full OTA installation."""
+    return self._DoCall("FullOTA_InstallBegin")
+
   def FullOTA_InstallEnd(self):
     """Called at the end of full OTA installation; typically this is
     used to install the image for the device's baseband processor."""
@@ -671,12 +675,23 @@ class DeviceSpecificParams(object):
     additional assertions they like."""
     return self._DoCall("IncrementalOTA_Assertions")
 
+  def IncrementalOTA_VerifyBegin(self):
+    """Called at the start of the verification phase of incremental
+    OTA installation; additional checks can be placed here to abort
+    the script before any changes are made."""
+    return self._DoCall("IncrementalOTA_VerifyBegin")
+
   def IncrementalOTA_VerifyEnd(self):
     """Called at the end of the verification phase of incremental OTA
     installation; additional checks can be placed here to abort the
     script before any changes are made."""
     return self._DoCall("IncrementalOTA_VerifyEnd")
 
+  def IncrementalOTA_InstallBegin(self):
+    """Called at the start of incremental OTA installation (after
+    verification is complete)."""
+    return self._DoCall("IncrementalOTA_InstallBegin")
+
   def IncrementalOTA_InstallEnd(self):
     """Called at the end of incremental OTA installation; typically
     this is used to install the image for the device's baseband

tools/releasetools/ota_from_target_files

@@ -382,6 +382,7 @@ def WriteFullOTAPackage(input_zip, output_zip):
 
   AppendAssertions(script, input_zip)
   device_specific.FullOTA_Assertions()
+  device_specific.FullOTA_InstallBegin()
 
   script.ShowProgress(0.5, 0)
 
@@ -559,6 +560,8 @@ def WriteIncrementalOTAPackage(target_zip, source_zip, output_zip):
 
   script.Print("Verifying current system...")
 
+  device_specific.IncrementalOTA_VerifyBegin()
+
   script.ShowProgress(0.1, 0)
   total_verify_size = float(sum([i[2].size for i in patch_list]) + 1)
   if updating_boot:
@@ -594,6 +597,8 @@ def WriteIncrementalOTAPackage(target_zip, source_zip, output_zip):
 
   script.Comment("---- start making changes here ----")
 
+  device_specific.IncrementalOTA_InstallBegin()
+
   if OPTIONS.wipe_user_data:
     script.Print("Erasing user data...")
     script.FormatPartition("/data")