Merge "Create hard links to avoid copy (3/n)"

import android.content.rollback.PackageRollbackInfo.RestoreInfo;

import android.content.rollback.RollbackInfo;

import android.os.UserHandle;

import android.system.ErrnoException;

import android.system.Os;

import android.util.AtomicFile;

import android.util.Slog;

import android.util.SparseIntArray;

        targetDir.mkdirs();

        File targetFile = new File(targetDir, sourceFile.getName());

        // TODO: Copy by hard link instead to save on cpu and storage space?

        try {

            // Create a hard link to avoid copy

            // TODO(b/168562373)

            // Linking between non-encrypted and encrypted is not supported and we have

            // encrypted /data/rollback and non-encrypted /data/apex/active. For now this works

            // because we happen to store encrypted files under /data/apex/active which is no

            // longer the case when compressed apex rolls out. We have to handle this case in

            // order not to fall back to copy.

            Os.link(sourceFile.getAbsolutePath(), targetFile.getAbsolutePath());

        } catch (ErrnoException ignore) {

            // Fall back to copy if hardlink can't be created

            Files.copy(sourceFile.toPath(), targetFile.toPath());

        }

    }

    /**

     * Returns the apk or apex files backed up for the given package.