gistfile1.txt

#backup.hook
[Trigger]
Operation = Upgrade
Operation = Remove
Type = Package
Target = linux

[Action]
Depends = coreutils
Depends = bash
When = PreTransaction
Exec = /usr/bin/bash -c 'mkdir /tmp/workdir && mkdir /tmp/kernel_backup && cp -r /usr/lib/modules/$(uname -r) /tmp/kernel_backup/'

#restore.hook
[Trigger]
Operation = Upgrade
Operation = Remove
Type = Package
Target = linux

[Action]
Depends = coreutils
Depends = bash
When = PostTransaction
Exec = /usr/bin/bash -c 'mount -t overlay overlay -o upperdir=/tmp/kernel_backup,lowerdir=/usr/lib/modules,workdir=/tmp/workdir /usr/lib/modules'