zectl-pacman-hook

It will create a boot environment prefixed with pacmanhook with zectl before each kernel upgrade. By default, it keeps only 1 boot environment, each kernel upgrade will overwrite previous boot environment.

$ sudo pacman -Syu
:: Synchronizing package databases...
 core is up to date
 extra is up to date
 community is up to date
 archzfs is up to date
 multilib is up to date
:: Starting full system upgrade...
resolving dependencies...
looking for conflicting packages...

Packages (1) linux-lts-5.4.39-1

Total Installed Size:  73.34 MiB
Net Upgrade Size:      -0.01 MiB

:: Proceed with installation? [Y/n] Y
(1/1) checking keys in keyring                     [------------------------] 100%
(1/1) checking package integrity                   [------------------------] 100%
(1/1) loading package files                        [------------------------] 100%
(1/1) checking for file conflicts                  [------------------------] 100%
(1/1) checking available disk space                [------------------------] 100%
:: Running pre-transaction hooks...
(1/3) Create a boot environment
• Destroyed pacmanhook-20200512T154713
• Created pacmanhook-20200512T154826
(2/3) Removing linux initcpios...
(3/3) Remove DKMS modules
:: Processing package changes...
(1/1) upgrading linux-lts                          [------------------------] 100%
:: Running post-transaction hooks...
...

Installation

Install aur package zectl-pacman-hook.

Configuration

To keep more than 1 boot environment, use:

zectl set pacmanhook-prunecount=5

Be aware of your /boot size limitation. To know ~ max prunecount you could set, try:

boot_size=$(du /boot | awk '{print $1}')
efi_size=$(df /efi --output=avail | sed '1d')
echo "$efi_size / $boot_size" | bc

To disable the hook, use:

zectl set pacmanhook="no"

Manual install

git clone https://github.com/eoli3n/zectl-pacman-hook
cd zectl-pacman-hook
makepkg -c
makepkg -si