PHP Fatal error: Uncaught Error: Call to undefined method Net_SMTP::starttls()

[kwisatz]

The roundcube image 1.6.0 is affected by the problem described in roundcube/roundcubemail#8698

Comparing the vendor directories shows that the update procedure that is a part of docker-entrypoint.sh doesn't seem to work on image upgrades:

root@cab8b2a38d6d:/var/www/html# ls -l /usr/src/roundcubemail/vendor/
total 52
-rw-r--r--  1 root root  427 Jul 23 20:17 autoload.php
drwxr-xr-x  3 root root 4096 Jul 23 20:17 bacon
drwxr-xr-x  2 root root 4096 Jul 28 21:06 bin
drwxr-xr-x  2 root root 4096 Jul 28 21:06 composer
drwxr-xr-x  3 root root 4096 Jul 28 21:06 dasprid
drwxr-xr-x  5 root root 4096 Jul 28 21:06 guzzlehttp
drwxr-xr-x  3 root root 4096 Jul 28 21:06 kolab
drwxr-xr-x  3 root root 4096 Jul 28 21:06 masterminds
drwxr-xr-x 13 root root 4096 Jul 28 21:06 pear
drwxr-xr-x  5 root root 4096 Jul 28 21:06 psr
drwxr-xr-x  3 root root 4096 Jul 28 21:06 ralouphie
drwxr-xr-x  4 root root 4096 Jul 28 21:06 roundcube
drwxr-xr-x  3 root root 4096 Jul 28 21:06 symfony
root@cab8b2a38d6d:/var/www/html# ls -l vendor/
total 32
-rw-r--r--  1 root root  427 Jun 26 15:44 autoload.php
drwxr-xr-x  2 root root 4096 Mar  6  2022 bin
drwxr-xr-x  2 root root 4096 Jun 19 17:31 composer
drwxr-xr-x  3 root root 4096 Dec 27  2020 endroid
drwxr-xr-x  3 root root 4096 Jun 19 17:31 kolab
drwxr-xr-x  3 root root 4096 Jan 22  2021 masterminds
drwxr-xr-x 14 root root 4096 Mar  6  2022 pear
drwxr-xr-x  3 root root 4096 Jan 22  2021 roundcube