Pacman Linux hook

Generates a pacman hook to update Linux version in the grub configuration file. Grub entries are updated with the correct Linux version every time the Linux package is updated.

Getting started

Prerequisites

To use this script you need:

pacman
A grub configuration file passed as environment variable (by default in /boot/grub/grub.cfg)

How to use It

By default:

git clone git@github.com:carmilso/pacman-linux-hook.git
cd pacman-linux-hook
./createPacmanLinuxHook.sh

Passing grub configuration file path as environment variable:

git clone git@github.com:carmilso/pacman-linux-hook.git
cd pacman-linux-hook
GRUB_CFG=/boot/grub.cfg ./createPacmanLinuxHook.sh

What is created when the script is executed?

The post-install pacman hook that will run every time the Linux package is updated in /etc/pacman.d/hooks/linux-post.hook
The script that updates the Linux version in the grub configuration file in /usr/local/bin/linux-post-install-pacman-hook.sh

After updating Linux...

There are two possible scenarios:

The hook has never been executed before
The grub configuration file already contains the Linux version

Before the update, in this first case we should have something similar to this inside the grub configuration file:

(...)
menuentry 'Arch Linux' --class arch --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-43ef0b61-66cc-4d35-ab56-694452acbce8' {
  (...)
  echo 'Loading Linux linux ...'
  (...)
}
(...)

Therefore, the result after running the script will be (in case Linux is being updated to version 5.5.13.arch1-1):

(...)
menuentry 'Arch Linux' --class arch --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-43ef0b61-66cc-4d35-ab56-694452acbce8' {
  (...)
  echo 'Loading Linux 5.5.13.arch1-1 ...'
  (...)
}
(...)

Before the update, in the second case we will already have the Linux version in the grub configuration file since the script has been executed before:

(...)
menuentry 'Arch Linux' --class arch --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-43ef0b61-66cc-4d35-ab56-694452acbce8' {
  (...)
  echo  'Loading Linux 5.5.12.arch1-1 ...'
  (...)
}
(...)

Therefore, the result after running the script will be (in case Linux is being updated to version 5.5.13.arch1-1):

(...)
menuentry 'Arch Linux' --class arch --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-43ef0b61-66cc-4d35-ab56-694452acbce8' {
  (...)
  echo  'Loading Linux 5.5.13.arch1-1 ...'
  (...)
}
(...)