tree f77fd4ee1c7687d5bec45f0c71fc24c8beda3e2f
parent a5b591ce8dea9832d1c4843f1233f083f171a63b
author Al Sutton <alsutton@google.com> 1575046019 +0000
committer Al Sutton <alsutton@google.com> 1577119312 +0000

Fix telephony backup creating diff when there is none.

The telephony provider recreates the message files for each
backup. This has the unfortunate side effect of making the
file modified time the time of the backup, which means the
diffing algorithm used for backups things the files have
changed.

To avoid this happening when there's no data change this CL
changes the backup agent to use the date from the most recent
message in a file as the file mtime, which should maintain
consistency between backup generations.

Bug: 140995339
Test: atest TelephonyProviderTests
Change-Id: I28753f2d92ef842d7ab4612913109a82d64d4d0a