Derive fingerprint at runtime when undefined.
Some devices leave "ro.build.fingerprint" undefined at build time,
since they need to build it from the components at runtime.
Bug: 13340779
Change-Id: I4d74398817af22079a11c196dc6742b85d2bfb61
diff --git a/core/java/android/os/Build.java b/core/java/android/os/Build.java
index 11e3795..5846bb5 100644
--- a/core/java/android/os/Build.java
+++ b/core/java/android/os/Build.java
@@ -16,6 +16,8 @@
package android.os;
+import android.text.TextUtils;
+
import com.android.internal.telephony.TelephonyProperties;
/**
@@ -509,7 +511,39 @@
public static final String TAGS = getString("ro.build.tags");
/** A string that uniquely identifies this build. Do not attempt to parse this value. */
- public static final String FINGERPRINT = getString("ro.build.fingerprint");
+ public static final String FINGERPRINT = deriveFingerprint();
+
+ /**
+ * Some devices split the fingerprint components between multiple
+ * partitions, so we might derive the fingerprint at runtime.
+ */
+ private static String deriveFingerprint() {
+ String finger = SystemProperties.get("ro.build.fingerprint");
+ if (TextUtils.isEmpty(finger)) {
+ finger = getString("ro.product.brand") + '/' +
+ getString("ro.product.name") + '/' +
+ getString("ro.product.device") + ':' +
+ getString("ro.build.version.release") + '/' +
+ getString("ro.build.id") + '/' +
+ getString("ro.build.version.incremental") + ':' +
+ getString("ro.build.type") + '/' +
+ getString("ro.build.tags");
+ }
+ return finger;
+ }
+
+ /**
+ * Ensure that raw fingerprint system property is defined. If it was derived
+ * dynamically by {@link #deriveFingerprint()} this is where we push the
+ * derived value into the property service.
+ *
+ * @hide
+ */
+ public static void ensureFingerprintProperty() {
+ if (TextUtils.isEmpty(SystemProperties.get("ro.build.fingerprint"))) {
+ SystemProperties.set("ro.build.fingerprint", FINGERPRINT);
+ }
+ }
// The following properties only make sense for internal engineering builds.
public static final long TIME = getLong("ro.build.date.utc") * 1000;
diff --git a/services/java/com/android/server/SystemServer.java b/services/java/com/android/server/SystemServer.java
index 00d5468..08b1eba 100644
--- a/services/java/com/android/server/SystemServer.java
+++ b/services/java/com/android/server/SystemServer.java
@@ -29,6 +29,7 @@
import android.content.pm.PackageManager;
import android.content.res.Configuration;
import android.media.AudioService;
+import android.os.Build;
import android.os.Environment;
import android.os.FactoryTest;
import android.os.Handler;
@@ -201,6 +202,10 @@
// as efficient as possible with its memory usage.
VMRuntime.getRuntime().setTargetHeapUtilization(0.8f);
+ // Some devices rely on runtime fingerprint generation, so make sure
+ // we've defined it before booting further.
+ Build.ensureFingerprintProperty();
+
// Within the system server, it is an error to access Environment paths without
// explicitly specifying a user.
Environment.setUserRequired(true);