recovery: Show slot indicator for A/B devices

When running on an A/B device, split the top version line horizontally
to show the Android version on the left and the boot slot on the right.

When not running on A/B device, center the Android version.

Change-Id: Ica18af5e46dadf1088fdfd6d23d96db090195a6a

1 files changed, 4 insertions, 0 deletions

diff --git a/ui.cpp b/ui.cpp
index 09b13779..126961c4 100644
--- a/ui.cpp
+++ b/ui.cpp
@@ -88,6 +88,10 @@ RecoveryUI::RecoveryUI()
   char propval[PROPERTY_VALUE_MAX];
   property_get("ro.build.version.release", propval, "(unknown)");
   android_version_ = std::string("Android ") + propval;
+  property_get("ro.boot.slot_suffix", propval, "");
+  if (propval[0] == '_') {
+      boot_slot_ = std::string("Slot ") + &propval[1];
+  }
   property_get("ro.lineage.version", propval, "(unknown)");
   lineage_version_ = std::string("LineageOS ") + propval;