Allow staging multiple session with non-overlapping packages (apk-only)

Bug: 141843321
Test: atest StagedInstallTest#testAllowNonOverlappingMultipleStagedInstall_BothSinglePackage_Apk
Test: atest StagedInstallTest#testFailOverlappingMultipleStagedInstall_BothSinglePackage_Apk
Test: atest StagedInstallTest#testFailOverlappingMultipleStagedInstall_BothSinglePackage_Apex
Test: atest StagedInstallTest#testAllowNonOverlappingMultipleStagedInstall_MultiPackageSinglePackage
Test: atest StagedInstallTest#testFailOverlappingMultipleStagedInstall_BothMultiPackage
Test: atest StagedInstallTest#testMultipleStagedInstall_ApkOnly
Test: atest RollbackManagerHostTest#testApkOnlyMultipleStagedRollback
Test: atest RollbackManagerHostTest#testApkOnlyMultipleStagedPartialRollback
Test: atest StagedInstallTest
Change-Id: Iad2e35b50fd22e207e3ad91b48a767827d8e8926

2 files changed, 53 insertions, 27 deletions

diff --git a/core/java/android/content/pm/PackageInstaller.java b/core/java/android/content/pm/PackageInstaller.java
index edc66c58b197..0c529798622e 100644
--- a/core/java/android/content/pm/PackageInstaller.java
+++ b/core/java/android/content/pm/PackageInstaller.java
@@ -68,6 +68,7 @@ import java.util.Iterator;
 import java.util.List;
 import java.util.Set;
 import java.util.concurrent.Executor;
+import java.util.stream.Collectors;
 
 /**
  * Offers the ability to install, upgrade, and remove applications on the
@@ -479,35 +480,30 @@ public class PackageInstaller {
     }
 
     /**
-     * Returns an active staged session, or {@code null} if there is none.
+     * Returns first active staged session, or {@code null} if there is none.
      *
-     * <p>Staged session is active iff:
-     * <ul>
-     *     <li>It is committed, i.e. {@link SessionInfo#isCommitted()} is {@code true}, and
-     *     <li>it is not applied, i.e. {@link SessionInfo#isStagedSessionApplied()} is {@code
-     *     false}, and
-     *     <li>it is not failed, i.e. {@link SessionInfo#isStagedSessionFailed()} is {@code false}.
-     * </ul>
+     * <p>For more information on what sessions are considered active see
+     * {@link SessionInfo#isStagedSessionActive()}.
      *
-     * <p>In case of a multi-apk session, reasoning above is applied to the parent session, since
-     * that is the one that should been {@link Session#commit committed}.
+     * @deprecated Use {@link #getActiveStagedSessions} as there can be more than one active staged
+     * session
      */
+    @Deprecated
     public @Nullable SessionInfo getActiveStagedSession() {
-        final List<SessionInfo> stagedSessions = getStagedSessions();
-        for (SessionInfo s : stagedSessions) {
-            if (s.isStagedSessionApplied() || s.isStagedSessionFailed()) {
-                // Finalized session.
-                continue;
-            }
-            if (s.getParentSessionId() != SessionInfo.INVALID_ID) {
-                // Child session.
-                continue;
-            }
-            if (s.isCommitted()) {
-                return s;
-            }
-        }
-        return null;
+        List<SessionInfo> activeSessions = getActiveStagedSessions();
+        return activeSessions.isEmpty() ? null : activeSessions.get(0);
+    }
+
+    /**
+     * Returns list of active staged sessions. Returns empty list if there is none.
+     *
+     * <p>For more information on what sessions are considered active see
+     *      * {@link SessionInfo#isStagedSessionActive()}.
+     */
+    public @NonNull List<SessionInfo> getActiveStagedSessions() {
+        return getStagedSessions().stream()
+                .filter(s -> s.isStagedSessionActive())
+                .collect(Collectors.toList());
     }
 
     /**
@@ -2227,13 +2223,36 @@ public class PackageInstaller {
         }
 
         /**
-         * Returns true if this session is a staged session which will be applied at next reboot.
+         * Returns true if this session is a staged session.
          */
         public boolean isStaged() {
             return isStaged;
         }
 
         /**
+         * Returns {@code true} if this session is an active staged session.
+         *
+         * We consider a session active if it has been committed and it is either pending
+         * verification, or will be applied at next reboot.
+         *
+         * <p>Staged session is active iff:
+         * <ul>
+         *     <li>It is committed, i.e. {@link SessionInfo#isCommitted()} is {@code true}, and
+         *     <li>it is not applied, i.e. {@link SessionInfo#isStagedSessionApplied()} is {@code
+         *     false}, and
+         *     <li>it is not failed, i.e. {@link SessionInfo#isStagedSessionFailed()} is
+         *     {@code false}.
+         * </ul>
+         *
+         * <p>In case of a multi-package session, reasoning above is applied to the parent session,
+         * since that is the one that should have been {@link Session#commit committed}.
+         */
+        public boolean isStagedSessionActive() {
+            return isStaged && isCommitted && !isStagedSessionApplied && !isStagedSessionFailed
+                    && !hasParentSessionId();
+        }
+
+        /**
          * Returns the parent multi-package session ID if this session belongs to one,
          * {@link #INVALID_ID} otherwise.
          */
@@ -2242,6 +2261,13 @@ public class PackageInstaller {
         }
 
         /**
+         * Returns true if session has a valid parent session, otherwise false.
+         */
+        public boolean hasParentSessionId() {
+            return parentSessionId != INVALID_ID;
+        }
+
+        /**
          * Returns the set of session IDs that will be committed when this session is commited if
          * this session is a multi-package session.
          */
diff --git a/core/java/android/content/pm/PackageManager.java b/core/java/android/content/pm/PackageManager.java
index c56c3076c3be..bbfdf910a9da 100644
--- a/core/java/android/content/pm/PackageManager.java
+++ b/core/java/android/content/pm/PackageManager.java
@@ -1435,7 +1435,7 @@ public abstract class PackageManager {
 
     /**
      * Installation failed return code: a new staged session was attempted to be committed while
-     * there is already one in-progress.
+     * there is already one in-progress or new session has package that is already staged.
      *
      * @hide
      */