Collect statistics of source build version

Parse the last_install and report the source build version of an ota
update.
Related CL in: ag/1121141

Bug: 28658632
Change-Id: I5e835c144aabe97fda681f60397ebf4416f7bd4f

diff --git a/core/java/android/os/RecoverySystem.java b/core/java/android/os/RecoverySystem.java
index 6c21398..7ff01da 100644 (file)
--- a/core/java/android/os/RecoverySystem.java
+++ b/core/java/android/os/RecoverySystem.java
@@ -695,6 +695,7 @@ public class RecoverySystem {
             String line = null;
             int bytesWrittenInMiB = -1, bytesStashedInMiB = -1;
             int timeTotal = -1;
+            int sourceVersion = -1;
             while ((line = in.readLine()) != null) {
                 // Here is an example of lines in last_install:
                 // ...
@@ -729,6 +730,8 @@ public class RecoverySystem {
 
                 if (line.startsWith("time")) {
                     timeTotal = scaled;
+                } else if (line.startsWith("source_version")) {
+                    sourceVersion = scaled;
                 } else if (line.startsWith("bytes_written")) {
                     bytesWrittenInMiB = (bytesWrittenInMiB == -1) ? scaled :
                             bytesWrittenInMiB + scaled;
@@ -742,6 +745,9 @@ public class RecoverySystem {
             if (timeTotal != -1) {
                 MetricsLogger.histogram(context, "ota_time_total", timeTotal);
             }
+            if (sourceVersion != -1) {
+                MetricsLogger.histogram(context, "ota_source_version", sourceVersion);
+            }
             if (bytesWrittenInMiB != -1) {
                 MetricsLogger.histogram(context, "ota_written_in_MiBs", bytesWrittenInMiB);
             }