PHP8 -- Oops, incompatible

2021-01-31

Minor fuckup: Nextcloud 18 is not PHP8 compatible.

This version of Nextcloud is not compatible with > PHP 7.4. You are currently running 8.0.1.

Resolution in a few steps:

• Query for all currently installed php packages: pacman -Qqs php
• Find and replace php with php7 in output: sed -r "s/php/php7/"
• Use resulting package list as installation argument: pacman -S -
• Glue it all together:

  ~ # pacman -Qqs php | sed -r "s/php/php7/" | pacman -S -
  resolving dependencies...
  looking for conflicting packages...
  
  Package (5)             New Version           Net Change  Download Size
  
  extra/php7              7.4.14-1               23.11 MiB       3.70 MiB
  extra/php7-fpm          7.4.14-1               16.07 MiB       2.55 MiB
  extra/php7-gd           7.4.14-1                0.10 MiB       0.03 MiB
  community/php7-imagick  3.4.4.r66.g448c1cd-2    0.46 MiB       0.11 MiB
  extra/php7-intl         7.4.14-1                0.44 MiB       0.13 MiB
  
  Total Download Size:    6.53 MiB
  Total Installed Size:  40.18 MiB
  
  :: Proceed with installation? [Y/n]
  

• Deinstall original php packages (which are now php8): pacman -Qqs php | grep -v php7 | pacman -R -
• Add symlinks from php to php7 binaries and modules

  ln -s /usr/bin/php7 /usr/bin/php
  ln -s /usr/bin/php-config{7,}
  ln -s /usr/bin/php-fpm{7,}
  ln -s /usr/bin/phpize{7,}
  ln -s /usr/lib/systemd/system/php-fpm{7,}.service 
  mv /etc/php7{,.original}
  mv /etc/php{,7}
  ln -s /etc/php7 /etc/php
  ln -s /usr/lib/php{7,}
  

• Get php configs from .pacsave files:

  cp /etc/php7/php.ini{.pacsave,}
  cp /etc/php7/php-fpm.d/www.conf{.pacsave,}
  cp /etc/php7/conf.d/imagick.ini{.pacsave,}
  

• Get php-fpm.conf from backup and place it into /etc/php7 (fingers crossed you have a backup ;-) )
• Restart php-fpm.service