Richard Uhler | 28e7323 | 2019-01-21 16:48:55 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2018 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package com.android.server.rollback; |
| 18 | |
Narayan Kamath | c034fe9 | 2019-01-23 10:48:17 +0000 | [diff] [blame] | 19 | import android.annotation.NonNull; |
Richard Uhler | a7e9b2d | 2019-01-22 17:20:58 +0000 | [diff] [blame] | 20 | import android.content.pm.VersionedPackage; |
Richard Uhler | 28e7323 | 2019-01-21 16:48:55 +0000 | [diff] [blame] | 21 | import android.content.rollback.PackageRollbackInfo; |
Narayan Kamath | c034fe9 | 2019-01-23 10:48:17 +0000 | [diff] [blame] | 22 | import android.content.rollback.PackageRollbackInfo.RestoreInfo; |
Richard Uhler | 28e7323 | 2019-01-21 16:48:55 +0000 | [diff] [blame] | 23 | import android.content.rollback.RollbackInfo; |
Narayan Kamath | c034fe9 | 2019-01-23 10:48:17 +0000 | [diff] [blame] | 24 | import android.util.IntArray; |
Richard Uhler | 28e7323 | 2019-01-21 16:48:55 +0000 | [diff] [blame] | 25 | import android.util.Log; |
| 26 | |
| 27 | import libcore.io.IoUtils; |
| 28 | |
| 29 | import org.json.JSONArray; |
| 30 | import org.json.JSONException; |
| 31 | import org.json.JSONObject; |
| 32 | |
| 33 | import java.io.File; |
| 34 | import java.io.IOException; |
| 35 | import java.io.PrintWriter; |
Richard Uhler | 1f571c6 | 2019-01-31 15:16:46 +0000 | [diff] [blame] | 36 | import java.nio.file.Files; |
Richard Uhler | 28e7323 | 2019-01-21 16:48:55 +0000 | [diff] [blame] | 37 | import java.time.Instant; |
| 38 | import java.time.format.DateTimeParseException; |
| 39 | import java.util.ArrayList; |
| 40 | import java.util.List; |
| 41 | |
| 42 | /** |
| 43 | * Helper class for loading and saving rollback data to persistent storage. |
| 44 | */ |
| 45 | class RollbackStore { |
| 46 | private static final String TAG = "RollbackManager"; |
| 47 | |
| 48 | // Assuming the rollback data directory is /data/rollback, we use the |
| 49 | // following directory structure to store persisted data for available and |
| 50 | // recently executed rollbacks: |
| 51 | // /data/rollback/ |
| 52 | // available/ |
| 53 | // XXX/ |
| 54 | // rollback.json |
| 55 | // com.package.A/ |
| 56 | // base.apk |
| 57 | // com.package.B/ |
| 58 | // base.apk |
| 59 | // YYY/ |
| 60 | // rollback.json |
| 61 | // com.package.C/ |
| 62 | // base.apk |
| 63 | // recently_executed.json |
| 64 | // |
Richard Uhler | b9d5447 | 2019-01-22 12:50:08 +0000 | [diff] [blame] | 65 | // * XXX, YYY are the rollbackIds for the corresponding rollbacks. |
Richard Uhler | 28e7323 | 2019-01-21 16:48:55 +0000 | [diff] [blame] | 66 | // * rollback.json contains all relevant metadata for the rollback. This |
| 67 | // file is not written until the rollback is made available. |
| 68 | // |
| 69 | // TODO: Use AtomicFile for all the .json files? |
| 70 | private final File mRollbackDataDir; |
| 71 | private final File mAvailableRollbacksDir; |
| 72 | private final File mRecentlyExecutedRollbacksFile; |
| 73 | |
| 74 | RollbackStore(File rollbackDataDir) { |
| 75 | mRollbackDataDir = rollbackDataDir; |
| 76 | mAvailableRollbacksDir = new File(mRollbackDataDir, "available"); |
| 77 | mRecentlyExecutedRollbacksFile = new File(mRollbackDataDir, "recently_executed.json"); |
| 78 | } |
| 79 | |
| 80 | /** |
| 81 | * Reads the list of available rollbacks from persistent storage. |
| 82 | */ |
| 83 | List<RollbackData> loadAvailableRollbacks() { |
| 84 | List<RollbackData> availableRollbacks = new ArrayList<>(); |
| 85 | mAvailableRollbacksDir.mkdirs(); |
| 86 | for (File rollbackDir : mAvailableRollbacksDir.listFiles()) { |
| 87 | if (rollbackDir.isDirectory()) { |
| 88 | try { |
| 89 | RollbackData data = loadRollbackData(rollbackDir); |
| 90 | availableRollbacks.add(data); |
| 91 | } catch (IOException e) { |
| 92 | // Note: Deleting the rollbackDir here will cause pending |
| 93 | // rollbacks to be deleted. This should only ever happen |
| 94 | // if reloadPersistedData is called while there are |
| 95 | // pending rollbacks. The reloadPersistedData method is |
| 96 | // currently only for testing, so that should be okay. |
| 97 | Log.e(TAG, "Unable to read rollback data at " + rollbackDir, e); |
| 98 | removeFile(rollbackDir); |
| 99 | } |
| 100 | } |
| 101 | } |
| 102 | return availableRollbacks; |
| 103 | } |
| 104 | |
| 105 | /** |
Narayan Kamath | c034fe9 | 2019-01-23 10:48:17 +0000 | [diff] [blame] | 106 | * Converts an {@code JSONArray} of integers to an {@code IntArray}. |
| 107 | */ |
| 108 | private static @NonNull IntArray convertToIntArray(@NonNull JSONArray jsonArray) |
| 109 | throws JSONException { |
| 110 | if (jsonArray.length() == 0) { |
| 111 | return new IntArray(); |
| 112 | } |
| 113 | |
| 114 | final int[] ret = new int[jsonArray.length()]; |
| 115 | for (int i = 0; i < ret.length; ++i) { |
| 116 | ret[i] = jsonArray.getInt(i); |
| 117 | } |
| 118 | |
| 119 | return IntArray.wrap(ret); |
| 120 | } |
| 121 | |
| 122 | /** |
| 123 | * Converts an {@code IntArray} into an {@code JSONArray} of integers. |
| 124 | */ |
| 125 | private static @NonNull JSONArray convertToJsonArray(@NonNull IntArray intArray) { |
| 126 | JSONArray jsonArray = new JSONArray(); |
| 127 | for (int i = 0; i < intArray.size(); ++i) { |
| 128 | jsonArray.put(intArray.get(i)); |
| 129 | } |
| 130 | |
| 131 | return jsonArray; |
| 132 | } |
| 133 | |
| 134 | private static @NonNull JSONArray convertToJsonArray(@NonNull List<RestoreInfo> list) |
| 135 | throws JSONException { |
| 136 | JSONArray jsonArray = new JSONArray(); |
| 137 | for (RestoreInfo ri : list) { |
| 138 | JSONObject jo = new JSONObject(); |
| 139 | jo.put("userId", ri.userId); |
| 140 | jo.put("appId", ri.appId); |
| 141 | jo.put("seInfo", ri.seInfo); |
| 142 | jsonArray.put(jo); |
| 143 | } |
| 144 | |
| 145 | return jsonArray; |
| 146 | } |
| 147 | |
| 148 | private static @NonNull ArrayList<RestoreInfo> convertToRestoreInfoArray( |
| 149 | @NonNull JSONArray array) throws JSONException { |
| 150 | ArrayList<RestoreInfo> restoreInfos = new ArrayList<>(); |
| 151 | |
| 152 | for (int i = 0; i < array.length(); ++i) { |
| 153 | JSONObject jo = array.getJSONObject(i); |
| 154 | restoreInfos.add(new RestoreInfo( |
| 155 | jo.getInt("userId"), |
| 156 | jo.getInt("appId"), |
| 157 | jo.getString("seInfo"))); |
| 158 | } |
| 159 | |
| 160 | return restoreInfos; |
| 161 | } |
| 162 | |
| 163 | /** |
Richard Uhler | 28e7323 | 2019-01-21 16:48:55 +0000 | [diff] [blame] | 164 | * Reads the list of recently executed rollbacks from persistent storage. |
| 165 | */ |
| 166 | List<RollbackInfo> loadRecentlyExecutedRollbacks() { |
| 167 | List<RollbackInfo> recentlyExecutedRollbacks = new ArrayList<>(); |
| 168 | if (mRecentlyExecutedRollbacksFile.exists()) { |
| 169 | try { |
| 170 | // TODO: How to cope with changes to the format of this file from |
| 171 | // when RollbackStore is updated in the future? |
| 172 | String jsonString = IoUtils.readFileAsString( |
| 173 | mRecentlyExecutedRollbacksFile.getAbsolutePath()); |
| 174 | JSONObject object = new JSONObject(jsonString); |
| 175 | JSONArray array = object.getJSONArray("recentlyExecuted"); |
| 176 | for (int i = 0; i < array.length(); ++i) { |
| 177 | JSONObject element = array.getJSONObject(i); |
Richard Uhler | b9d5447 | 2019-01-22 12:50:08 +0000 | [diff] [blame] | 178 | int rollbackId = element.getInt("rollbackId"); |
Richard Uhler | 0a79b32 | 2019-01-23 13:51:07 +0000 | [diff] [blame] | 179 | List<PackageRollbackInfo> packages = packageRollbackInfosFromJson( |
| 180 | element.getJSONArray("packages")); |
Richard Uhler | ccf035d | 2019-02-04 14:04:52 +0000 | [diff] [blame] | 181 | boolean isStaged = element.getBoolean("isStaged"); |
Richard Uhler | bf5b5c4 | 2019-01-28 15:26:37 +0000 | [diff] [blame] | 182 | List<VersionedPackage> causePackages = versionedPackagesFromJson( |
| 183 | element.getJSONArray("causePackages")); |
Richard Uhler | ccf035d | 2019-02-04 14:04:52 +0000 | [diff] [blame] | 184 | int committedSessionId = element.getInt("committedSessionId"); |
| 185 | RollbackInfo rollback = new RollbackInfo(rollbackId, packages, isStaged, |
| 186 | causePackages, committedSessionId); |
Richard Uhler | 28e7323 | 2019-01-21 16:48:55 +0000 | [diff] [blame] | 187 | recentlyExecutedRollbacks.add(rollback); |
| 188 | } |
| 189 | } catch (IOException | JSONException e) { |
| 190 | // TODO: What to do here? Surely we shouldn't just forget about |
| 191 | // everything after the point of exception? |
| 192 | Log.e(TAG, "Failed to read recently executed rollbacks", e); |
| 193 | } |
| 194 | } |
| 195 | |
| 196 | return recentlyExecutedRollbacks; |
| 197 | } |
| 198 | |
| 199 | /** |
| 200 | * Creates a new RollbackData instance with backupDir assigned. |
| 201 | */ |
Richard Uhler | b9d5447 | 2019-01-22 12:50:08 +0000 | [diff] [blame] | 202 | RollbackData createAvailableRollback(int rollbackId) throws IOException { |
| 203 | File backupDir = new File(mAvailableRollbacksDir, Integer.toString(rollbackId)); |
Richard Uhler | 60ac706 | 2019-02-05 13:25:39 +0000 | [diff] [blame] | 204 | return new RollbackData(rollbackId, backupDir, -1, true); |
Narayan Kamath | fcd4a04 | 2019-02-01 14:16:37 +0000 | [diff] [blame] | 205 | } |
| 206 | |
| 207 | RollbackData createPendingStagedRollback(int rollbackId, int stagedSessionId) |
| 208 | throws IOException { |
| 209 | File backupDir = new File(mAvailableRollbacksDir, Integer.toString(rollbackId)); |
Richard Uhler | 60ac706 | 2019-02-05 13:25:39 +0000 | [diff] [blame] | 210 | return new RollbackData(rollbackId, backupDir, stagedSessionId, false); |
Richard Uhler | 28e7323 | 2019-01-21 16:48:55 +0000 | [diff] [blame] | 211 | } |
| 212 | |
| 213 | /** |
Richard Uhler | 1f571c6 | 2019-01-31 15:16:46 +0000 | [diff] [blame] | 214 | * Creates a backup copy of the apk or apex for a package. |
Richard Uhler | 28e7323 | 2019-01-21 16:48:55 +0000 | [diff] [blame] | 215 | */ |
Richard Uhler | 1f571c6 | 2019-01-31 15:16:46 +0000 | [diff] [blame] | 216 | static void backupPackageCode(RollbackData data, String packageName, String codePath) |
| 217 | throws IOException { |
| 218 | File sourceFile = new File(codePath); |
| 219 | File targetDir = new File(data.backupDir, packageName); |
| 220 | targetDir.mkdirs(); |
| 221 | File targetFile = new File(targetDir, sourceFile.getName()); |
| 222 | |
| 223 | // TODO: Copy by hard link instead to save on cpu and storage space? |
| 224 | Files.copy(sourceFile.toPath(), targetFile.toPath()); |
| 225 | } |
| 226 | |
| 227 | /** |
| 228 | * Returns the apk or apex file backed up for the given package. |
| 229 | * Returns null if none found. |
| 230 | */ |
| 231 | static File getPackageCode(RollbackData data, String packageName) { |
| 232 | File targetDir = new File(data.backupDir, packageName); |
| 233 | File[] files = targetDir.listFiles(); |
| 234 | if (files == null || files.length != 1) { |
| 235 | return null; |
| 236 | } |
| 237 | return files[0]; |
Richard Uhler | 28e7323 | 2019-01-21 16:48:55 +0000 | [diff] [blame] | 238 | } |
| 239 | |
| 240 | /** |
| 241 | * Writes the metadata for an available rollback to persistent storage. |
| 242 | */ |
| 243 | void saveAvailableRollback(RollbackData data) throws IOException { |
| 244 | try { |
| 245 | JSONObject dataJson = new JSONObject(); |
Richard Uhler | b9d5447 | 2019-01-22 12:50:08 +0000 | [diff] [blame] | 246 | dataJson.put("rollbackId", data.rollbackId); |
Richard Uhler | 0a79b32 | 2019-01-23 13:51:07 +0000 | [diff] [blame] | 247 | dataJson.put("packages", toJson(data.packages)); |
Richard Uhler | 28e7323 | 2019-01-21 16:48:55 +0000 | [diff] [blame] | 248 | dataJson.put("timestamp", data.timestamp.toString()); |
Narayan Kamath | fcd4a04 | 2019-02-01 14:16:37 +0000 | [diff] [blame] | 249 | dataJson.put("stagedSessionId", data.stagedSessionId); |
Richard Uhler | 60ac706 | 2019-02-05 13:25:39 +0000 | [diff] [blame] | 250 | dataJson.put("isAvailable", data.isAvailable); |
Richard Uhler | ba13ab2 | 2019-02-05 15:27:12 +0000 | [diff] [blame^] | 251 | dataJson.put("apkSessionId", data.apkSessionId); |
Richard Uhler | 28e7323 | 2019-01-21 16:48:55 +0000 | [diff] [blame] | 252 | |
| 253 | PrintWriter pw = new PrintWriter(new File(data.backupDir, "rollback.json")); |
| 254 | pw.println(dataJson.toString()); |
| 255 | pw.close(); |
| 256 | } catch (JSONException e) { |
| 257 | throw new IOException(e); |
| 258 | } |
| 259 | } |
| 260 | |
| 261 | /** |
| 262 | * Removes all persistant storage associated with the given available |
| 263 | * rollback. |
| 264 | */ |
| 265 | void deleteAvailableRollback(RollbackData data) { |
Narayan Kamath | 869f706 | 2019-01-10 12:24:15 +0000 | [diff] [blame] | 266 | // TODO(narayan): Make sure we delete the userdata snapshot along with the backup of the |
| 267 | // actual app. |
Richard Uhler | 28e7323 | 2019-01-21 16:48:55 +0000 | [diff] [blame] | 268 | removeFile(data.backupDir); |
| 269 | } |
| 270 | |
| 271 | /** |
| 272 | * Writes the list of recently executed rollbacks to storage. |
| 273 | */ |
| 274 | void saveRecentlyExecutedRollbacks(List<RollbackInfo> recentlyExecutedRollbacks) { |
| 275 | try { |
| 276 | JSONObject json = new JSONObject(); |
| 277 | JSONArray array = new JSONArray(); |
| 278 | json.put("recentlyExecuted", array); |
| 279 | |
| 280 | for (int i = 0; i < recentlyExecutedRollbacks.size(); ++i) { |
| 281 | RollbackInfo rollback = recentlyExecutedRollbacks.get(i); |
| 282 | JSONObject element = new JSONObject(); |
Richard Uhler | b9d5447 | 2019-01-22 12:50:08 +0000 | [diff] [blame] | 283 | element.put("rollbackId", rollback.getRollbackId()); |
Richard Uhler | 0a79b32 | 2019-01-23 13:51:07 +0000 | [diff] [blame] | 284 | element.put("packages", toJson(rollback.getPackages())); |
Richard Uhler | ccf035d | 2019-02-04 14:04:52 +0000 | [diff] [blame] | 285 | element.put("isStaged", rollback.isStaged()); |
Richard Uhler | bf5b5c4 | 2019-01-28 15:26:37 +0000 | [diff] [blame] | 286 | element.put("causePackages", versionedPackagesToJson(rollback.getCausePackages())); |
Richard Uhler | ccf035d | 2019-02-04 14:04:52 +0000 | [diff] [blame] | 287 | element.put("committedSessionId", rollback.getCommittedSessionId()); |
Richard Uhler | 28e7323 | 2019-01-21 16:48:55 +0000 | [diff] [blame] | 288 | array.put(element); |
| 289 | } |
| 290 | |
| 291 | PrintWriter pw = new PrintWriter(mRecentlyExecutedRollbacksFile); |
| 292 | pw.println(json.toString()); |
| 293 | pw.close(); |
| 294 | } catch (IOException | JSONException e) { |
| 295 | // TODO: What to do here? |
| 296 | Log.e(TAG, "Failed to save recently executed rollbacks", e); |
| 297 | } |
| 298 | } |
| 299 | |
| 300 | /** |
| 301 | * Reads the metadata for a rollback from the given directory. |
| 302 | * @throws IOException in case of error reading the data. |
| 303 | */ |
| 304 | private RollbackData loadRollbackData(File backupDir) throws IOException { |
| 305 | try { |
Richard Uhler | 28e7323 | 2019-01-21 16:48:55 +0000 | [diff] [blame] | 306 | File rollbackJsonFile = new File(backupDir, "rollback.json"); |
| 307 | JSONObject dataJson = new JSONObject( |
| 308 | IoUtils.readFileAsString(rollbackJsonFile.getAbsolutePath())); |
Richard Uhler | b9d5447 | 2019-01-22 12:50:08 +0000 | [diff] [blame] | 309 | |
| 310 | int rollbackId = dataJson.getInt("rollbackId"); |
Narayan Kamath | fcd4a04 | 2019-02-01 14:16:37 +0000 | [diff] [blame] | 311 | int stagedSessionId = dataJson.getInt("stagedSessionId"); |
Richard Uhler | 60ac706 | 2019-02-05 13:25:39 +0000 | [diff] [blame] | 312 | boolean isAvailable = dataJson.getBoolean("isAvailable"); |
Narayan Kamath | fcd4a04 | 2019-02-01 14:16:37 +0000 | [diff] [blame] | 313 | RollbackData data = new RollbackData(rollbackId, backupDir, |
Richard Uhler | 60ac706 | 2019-02-05 13:25:39 +0000 | [diff] [blame] | 314 | stagedSessionId, isAvailable); |
Richard Uhler | 0a79b32 | 2019-01-23 13:51:07 +0000 | [diff] [blame] | 315 | data.packages.addAll(packageRollbackInfosFromJson(dataJson.getJSONArray("packages"))); |
Richard Uhler | 28e7323 | 2019-01-21 16:48:55 +0000 | [diff] [blame] | 316 | data.timestamp = Instant.parse(dataJson.getString("timestamp")); |
Richard Uhler | ba13ab2 | 2019-02-05 15:27:12 +0000 | [diff] [blame^] | 317 | data.apkSessionId = dataJson.getInt("apkSessionId"); |
Richard Uhler | 28e7323 | 2019-01-21 16:48:55 +0000 | [diff] [blame] | 318 | return data; |
| 319 | } catch (JSONException | DateTimeParseException e) { |
| 320 | throw new IOException(e); |
| 321 | } |
| 322 | } |
| 323 | |
Richard Uhler | bf5b5c4 | 2019-01-28 15:26:37 +0000 | [diff] [blame] | 324 | private JSONObject toJson(VersionedPackage pkg) throws JSONException { |
| 325 | JSONObject json = new JSONObject(); |
| 326 | json.put("packageName", pkg.getPackageName()); |
| 327 | json.put("longVersionCode", pkg.getLongVersionCode()); |
| 328 | return json; |
| 329 | } |
| 330 | |
| 331 | private VersionedPackage versionedPackageFromJson(JSONObject json) throws JSONException { |
| 332 | String packageName = json.getString("packageName"); |
| 333 | long longVersionCode = json.getLong("longVersionCode"); |
| 334 | return new VersionedPackage(packageName, longVersionCode); |
| 335 | } |
| 336 | |
Richard Uhler | 0a79b32 | 2019-01-23 13:51:07 +0000 | [diff] [blame] | 337 | private JSONObject toJson(PackageRollbackInfo info) throws JSONException { |
| 338 | JSONObject json = new JSONObject(); |
Richard Uhler | bf5b5c4 | 2019-01-28 15:26:37 +0000 | [diff] [blame] | 339 | json.put("versionRolledBackFrom", toJson(info.getVersionRolledBackFrom())); |
| 340 | json.put("versionRolledBackTo", toJson(info.getVersionRolledBackTo())); |
Narayan Kamath | c034fe9 | 2019-01-23 10:48:17 +0000 | [diff] [blame] | 341 | |
| 342 | IntArray pendingBackups = info.getPendingBackups(); |
| 343 | List<RestoreInfo> pendingRestores = info.getPendingRestores(); |
| 344 | json.put("pendingBackups", convertToJsonArray(pendingBackups)); |
| 345 | json.put("pendingRestores", convertToJsonArray(pendingRestores)); |
| 346 | |
Narayan Kamath | fcd4a04 | 2019-02-01 14:16:37 +0000 | [diff] [blame] | 347 | json.put("isApex", info.isApex()); |
| 348 | |
Richard Uhler | 0a79b32 | 2019-01-23 13:51:07 +0000 | [diff] [blame] | 349 | return json; |
| 350 | } |
| 351 | |
| 352 | private PackageRollbackInfo packageRollbackInfoFromJson(JSONObject json) throws JSONException { |
Richard Uhler | bf5b5c4 | 2019-01-28 15:26:37 +0000 | [diff] [blame] | 353 | VersionedPackage versionRolledBackFrom = versionedPackageFromJson( |
| 354 | json.getJSONObject("versionRolledBackFrom")); |
| 355 | VersionedPackage versionRolledBackTo = versionedPackageFromJson( |
| 356 | json.getJSONObject("versionRolledBackTo")); |
Narayan Kamath | c034fe9 | 2019-01-23 10:48:17 +0000 | [diff] [blame] | 357 | |
| 358 | final IntArray pendingBackups = convertToIntArray( |
| 359 | json.getJSONArray("pendingBackups")); |
| 360 | final ArrayList<RestoreInfo> pendingRestores = convertToRestoreInfoArray( |
| 361 | json.getJSONArray("pendingRestores")); |
| 362 | |
Narayan Kamath | fcd4a04 | 2019-02-01 14:16:37 +0000 | [diff] [blame] | 363 | final boolean isApex = json.getBoolean("isApex"); |
| 364 | |
Narayan Kamath | c034fe9 | 2019-01-23 10:48:17 +0000 | [diff] [blame] | 365 | return new PackageRollbackInfo(versionRolledBackFrom, versionRolledBackTo, |
Narayan Kamath | fcd4a04 | 2019-02-01 14:16:37 +0000 | [diff] [blame] | 366 | pendingBackups, pendingRestores, isApex); |
Richard Uhler | bf5b5c4 | 2019-01-28 15:26:37 +0000 | [diff] [blame] | 367 | } |
| 368 | |
| 369 | private JSONArray versionedPackagesToJson(List<VersionedPackage> packages) |
| 370 | throws JSONException { |
| 371 | JSONArray json = new JSONArray(); |
| 372 | for (VersionedPackage pkg : packages) { |
| 373 | json.put(toJson(pkg)); |
| 374 | } |
| 375 | return json; |
| 376 | } |
| 377 | |
| 378 | private List<VersionedPackage> versionedPackagesFromJson(JSONArray json) throws JSONException { |
| 379 | List<VersionedPackage> packages = new ArrayList<>(); |
| 380 | for (int i = 0; i < json.length(); ++i) { |
| 381 | packages.add(versionedPackageFromJson(json.getJSONObject(i))); |
| 382 | } |
| 383 | return packages; |
Richard Uhler | 0a79b32 | 2019-01-23 13:51:07 +0000 | [diff] [blame] | 384 | } |
| 385 | |
| 386 | private JSONArray toJson(List<PackageRollbackInfo> infos) throws JSONException { |
| 387 | JSONArray json = new JSONArray(); |
| 388 | for (PackageRollbackInfo info : infos) { |
| 389 | json.put(toJson(info)); |
| 390 | } |
| 391 | return json; |
| 392 | } |
| 393 | |
| 394 | private List<PackageRollbackInfo> packageRollbackInfosFromJson(JSONArray json) |
| 395 | throws JSONException { |
| 396 | List<PackageRollbackInfo> infos = new ArrayList<>(); |
| 397 | for (int i = 0; i < json.length(); ++i) { |
| 398 | infos.add(packageRollbackInfoFromJson(json.getJSONObject(i))); |
| 399 | } |
| 400 | return infos; |
| 401 | } |
| 402 | |
Richard Uhler | 28e7323 | 2019-01-21 16:48:55 +0000 | [diff] [blame] | 403 | /** |
| 404 | * Deletes a file completely. |
| 405 | * If the file is a directory, its contents are deleted as well. |
| 406 | * Has no effect if the directory does not exist. |
| 407 | */ |
| 408 | private void removeFile(File file) { |
| 409 | if (file.isDirectory()) { |
| 410 | for (File child : file.listFiles()) { |
| 411 | removeFile(child); |
| 412 | } |
| 413 | } |
| 414 | if (file.exists()) { |
| 415 | file.delete(); |
| 416 | } |
| 417 | } |
| 418 | } |