(FFOS Gecko & Gaia) OTA - 關鍵的apply

標籤：

　　這篇分析已經是尾聲了，在UpdatePrompt中，調用了UpdateService的applyOsUpdate函數。

 

1. UpdateService.applyOsUpdate

　　這個函數很簡單，就是擷取到update.zip以後，調用recovery service去完成更新。

  applyOsUpdate: function AUS_applyOsUpdate(aUpdate) {    if (!aUpdate.isOSUpdate || aUpdate.state != STATE_APPLIED) {      aUpdate.statusText = "fota-state-error";      throw Cr.NS_ERROR_FAILURE;    }    aUpdate.QueryInterface(Ci.nsIWritablePropertyBag);    let osApplyToDir = aUpdate.getProperty("osApplyToDir");    if (!osApplyToDir) {      LOG("UpdateService:applyOsUpdate - Error: osApplyToDir is not defined" +          "in the nsIUpdate!");      pingStateAndStatusCodes(aUpdate, false,                              STATE_FAILED + ": " + FOTA_FILE_OPERATION_ERROR);      handleUpdateFailure(aUpdate, FOTA_FILE_OPERATION_ERROR);      return;    }    // 擷取最終的update.zip    let updateFile = Cc["@mozilla.org/file/local;1"].createInstance(Ci.nsIFile);    updateFile.initWithPath(osApplyToDir + "/update.zip");    if (!updateFile.exists()) {      LOG("UpdateService:applyOsUpdate - Error: OS update is not found at " +          updateFile.path);      pingStateAndStatusCodes(aUpdate, false,                              STATE_FAILED + ": " + FOTA_FILE_OPERATION_ERROR);      handleUpdateFailure(aUpdate, FOTA_FILE_OPERATION_ERROR);      return;    }    writeStatusFile(getUpdatesDir(), aUpdate.state = STATE_APPLIED_OS);    LOG("UpdateService:applyOsUpdate - Rebooting into recovery to apply " +        "FOTA update: " + updateFile.path);    try {      let recoveryService = Cc["@mozilla.org/recovery-service;1"]                            .getService(Ci.nsIRecoveryService);      recoveryService.installFotaUpdate(updateFile.path);    } catch (e) {      LOG("UpdateService:applyOsUpdate - Error: Couldn‘t reboot into recovery" +          " to apply FOTA update " + updateFile.path);      pingStateAndStatusCodes(aUpdate, false,                              STATE_FAILED + ": " + FOTA_RECOVERY_ERROR);      writeStatusFile(getUpdatesDir(), aUpdate.state = STATE_APPLIED);      handleUpdateFailure(aUpdate, FOTA_RECOVERY_ERROR);    }  },

 

2. "@mozilla.org/recovery-service;1"

　　這個service就不在這裡分析了，很簡單，只是對librecovery.so的簡單封裝，熟悉android OTA的同學一看就懂。

(FFOS Gecko & Gaia) OTA - 關鍵的apply