Merge "Add PackageManager feature strings for EROFS." into tm-dev

core/api/system-current.txt

@@ -3414,6 +3414,8 @@ package android.content.pm {
     field public static final String EXTRA_REQUEST_PERMISSIONS_RESULTS = "android.content.pm.extra.REQUEST_PERMISSIONS_RESULTS";
     field public static final String FEATURE_BROADCAST_RADIO = "android.hardware.broadcastradio";
     field public static final String FEATURE_CONTEXT_HUB = "android.hardware.context_hub";
+    field public static final String FEATURE_EROFS = "android.software.erofs";
+    field public static final String FEATURE_EROFS_LEGACY = "android.software.erofs_legacy";
     field public static final String FEATURE_GAME_SERVICE = "android.software.game_service";
     field public static final String FEATURE_INCREMENTAL_DELIVERY = "android.software.incremental_delivery";
     field public static final String FEATURE_REBOOT_ESCROW = "android.hardware.reboot_escrow";

core/java/android/content/pm/PackageManager.java

@@ -4086,6 +4086,28 @@ public abstract class PackageManager {
     public static final String FEATURE_INCREMENTAL_DELIVERY =
             "android.software.incremental_delivery";
 
+    /**
+     * Feature for {@link #getSystemAvailableFeatures} and {@link #hasSystemFeature}: The device
+     * has the requisite kernel support for the EROFS filesystem present in 4.19 kernels as a
+     * staging driver, which lacks 0padding and big pcluster support.
+     *
+     * @hide
+     */
+    @SystemApi
+    @SdkConstant(SdkConstantType.FEATURE)
+    public static final String FEATURE_EROFS_LEGACY = "android.software.erofs_legacy";
+
+    /**
+     * Feature for {@link #getSystemAvailableFeatures} and {@link #hasSystemFeature}: The device
+     * has the requisite kernel support for the EROFS filesystem present in 5.10 kernels, which
+     * has 0padding, big pcluster, and chunked index support.
+     *
+     * @hide
+     */
+    @SystemApi
+    @SdkConstant(SdkConstantType.FEATURE)
+    public static final String FEATURE_EROFS = "android.software.erofs";
+
     /**
      * Feature for {@link #getSystemAvailableFeatures} and {@link #hasSystemFeature}:
      * The device has tuner hardware to support tuner operations.

core/java/com/android/server/SystemConfig.java

@@ -31,6 +31,7 @@ import android.os.FileUtils;
 import android.os.Process;
 import android.os.SystemProperties;
 import android.os.Trace;
+import android.os.VintfRuntimeInfo;
 import android.os.incremental.IncrementalManager;
 import android.os.storage.StorageManager;
 import android.permission.PermissionManager.SplitPermissionInfo;
@@ -57,7 +58,10 @@ import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.FileReader;
 import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
 import java.nio.file.Path;
+import java.nio.file.Paths;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
@@ -1447,6 +1451,14 @@ public class SystemConfig {
             addFeature(PackageManager.FEATURE_IPSEC_TUNNELS, 0);
         }
 
+        if (isFilesystemSupported("erofs")) {
+            if (isKernelVersionAtLeast(5, 10)) {
+                addFeature(PackageManager.FEATURE_EROFS, 0);
+            } else if (isKernelVersionAtLeast(4, 19)) {
+                addFeature(PackageManager.FEATURE_EROFS_LEGACY, 0);
+            }
+        }
+
         for (String featureName : mUnavailableFeatures) {
             removeFeature(featureName);
         }
@@ -1816,4 +1828,29 @@ public class SystemConfig {
     private static boolean isSystemProcess() {
         return Process.myUid() == Process.SYSTEM_UID;
     }
+
+    private static boolean isFilesystemSupported(String fs) {
+        try {
+            final byte[] fsTableData = Files.readAllBytes(Paths.get("/proc/filesystems"));
+            final String fsTable = new String(fsTableData, StandardCharsets.UTF_8);
+            return fsTable.contains("\t" + fs + "\n");
+        } catch (Exception e) {
+            return false;
+        }
+    }
+
+    private static boolean isKernelVersionAtLeast(int major, int minor) {
+        final String kernelVersion = VintfRuntimeInfo.getKernelVersion();
+        final String[] parts = kernelVersion.split("\\.");
+        if (parts.length < 2) {
+            return false;
+        }
+        try {
+            final int majorVersion = Integer.parseInt(parts[0]);
+            final int minorVersion = Integer.parseInt(parts[1]);
+            return majorVersion > major || (majorVersion == major && minorVersion >= minor);
+        } catch (NumberFormatException e) {
+            return false;
+        }
+    }
 }