Drupal的升级到8.2.3失败

Question

我的Drupal 8.2.2运行的全新安装，随后https://www.drupal.org/node/2550801与drush更新它，但我得到：

$ drush pm-update drupal 
Update information last refreshed: Fri, 11/18/2016 - 22:02 
Name Installed Version Proposed version Message     
Drupal 8.2.2    8.2.3    SECURITY UPDATE available 


Code updates will be made to drupal core. 
WARNING: Updating core will discard any modifications made to Drupal core files, most noteworthy among these are .htaccess and robots.txt. If you have made any modifications to these files, please back them up before updating so that you can re-create your modifications in the updated version of the file. 
Note: Updating core can potentially break your site. It is NOT recommended to update production sites without prior testing. 

Do you really want to continue? (y/n): y 
Drupal root path is not writable.                         [error] 
/var/www/html $ drush pm-update drupal 
Update information last refreshed: Fri, 11/18/2016 - 22:02 
Name Installed Version Proposed version Message     
Drupal 8.2.2    8.2.3    SECURITY UPDATE available 


Code updates will be made to drupal core. 
WARNING: Updating core will discard any modifications made to Drupal core files, most noteworthy among these are .htaccess and robots.txt. If you have made any modifications to these files, please back them up before updating so that you can re-create your modifications in the updated version of the file. 
Note: Updating core can potentially break your site. It is NOT recommended to update production sites without prior testing. 

Do you really want to continue? (y/n): y 
Project drupal was updated successfully. Installed version is now 8.2.3. 
Backups were saved into the directory /home/www-data/drush-backups/drupal/20161118222811/drupal.          [ok] 
[18-Nov-2016 22:28:41 UTC] Error: Call to undefined function drupal_get_installed_schema_version() in /var/www/html/core/includes/install.inc on line 80 #0 phar:///usr/local/bin/drush/commands/core/drupal/update.inc(111): drupal_load_updates() 
#1 phar:///usr/local/bin/drush/commands/core/core.drush.inc(462): update_main() 
#2 phar:///usr/local/bin/drush/includes/command.inc(422): drush_core_updatedb() 
#3 phar:///usr/local/bin/drush/includes/command.inc(231): _drush_invoke_hooks(Array, Array) 
#4 phar:///usr/local/bin/drush/includes/command.inc(199): drush_command() 
#5 phar:///usr/local/bin/drush/lib/Drush/Boot/BaseBoot.php(67): drush_dispatch(Array) 
#6 phar:///usr/local/bin/drush/includes/preflight.inc(66): Drush\Boot\BaseBoot->bootstrap_and_dispatch() 
#7 phar:///usr/local/bin/drush/includes/startup.inc(458): drush_main() 
#8 phar:///usr/local/bin/drush/includes/startup.inc(365): drush_run_main(false, '/', 'Phar detected. ...') 
#9 phar:///usr/local/bin/drush/drush(114): drush_startup(Array) 
#10 /usr/local/bin/drush(10): require('phar:///usr/loc...') 
#11 {main} 
Error: Call to undefined function drupal_get_installed_schema_version() in drupal_load_updates() (line 80 of /var/www/html/core/includes/install.inc). 
Drush command terminated abnormally due to an unrecoverable error. 

我缺少的东西？

Answer 1

我已成功将drupal 8.2.2更新到新版本8.2.3。 请找台阶

$ drush pm-update drupal 
Update information last refreshed: Mon, 11/21/2016 - 12:05 
Name Installed Version Proposed version Message     
Drupal 8.2.2    8.2.3    SECURITY UPDATE available 


Code updates will be made to drupal core. 
WARNING: Updating core will discard any modifications made to Drupal core files, most noteworthy among these are .htaccess and robots.txt. If you have made any modifications to these files, please back them up before updating so that you can re-create your modifications in the updated version of the file. 
Note: Updating core can potentially break your site. It is NOT recommended to update production sites without prior testing. 

Do you really want to continue? (y/n): y 

Project drupal was updated successfully. Installed version is now 8.2.3. 
Backups were saved into the directory /home/drush-backups/d8_dbupdate_nov21/20161121110543/drupal.         [ok] 

The following updates are pending: 

system module : 
    8202 - Clear caches due to behavior change in MachineName element. 

Do you wish to run all pending updates? (y/n): y 

Performing system_update_8202                            [ok] 

Cache rebuild complete.                              [ok] 

Finished performing updates.                            [ok] 

更新drush到最新版本可能有助于解决这个问题。

$ drush version 

Drush版本：8.1.7

也比较PHP版本。

Answer 2

确保文件可以被Web服务器读取。这可能是核心/ includes/schema.inc不可读（这是drupal_get_installed_schema_version所在的地方）。