A script to enable hybernation on Fedora workstation.

fedora_hybernate.sh

#!/bin/bash

# Credits:
# Hibernation in Fedora Workstation
# Fedora Magazine
# Posted by Alexander Wellbrock	on August 10, 2022 
# https://fedoramagazine.org/hibernation-in-fedora-36-workstation/
# Which was based on: https://gist.github.com/eloylp/b0d64d3c947dbfb23d13864e0c051c67

# WARNING: This script has not been properly tested.

# Size the the swap has to be on Fedora is zram + ram size
# Please make sure you have enough free space on your system
swap_size=$(
	free -h |
	awk -F':' '{print $2; gsub("Gi","");print $1}' |
	awk '{total = total + $1}END{print total+1}'
)

swapfile_path='/swap/swapfile'

create_swapfile() {
	sudo btrfs subvolume create /swap
	sudo touch "$swapfile_path"
	sudo chattr +C "$swapfile_path"
	sudo fallocate --length "${swap_size}"G "$swapfile_path"
	sudo chmod 600 "$swapfile_path"
	sudo mkswap "$swapfile_path"
}

main(){
	create_swapfile
	swap_file_UUID="$(findmnt -no UUID -T $swapfile_path)"

	cat <<-EOF | sudo tee /etc/dracut.conf.d/resume.conf
		add_dracutmodules+=" resume "
	EOF

	sudo dracut -f

	curl --output btrfs_map_physical.c \
	https://raw.githubusercontent.com/osandov/osandov-linux/master/scripts/btrfs_map_physical.c

	gcc -O2 -o btrfs_map_physical btrfs_map_physical.c

	pysical_offset=$(sudo ./btrfs_map_physical "$swapfile_path" | awk 'NR==2 {print $(NF)}')
	page_size="$(getconf PAGESIZE)"

	resume_offset="$(awk -v var1=$pysical_offset -v var2=$page_size 'BEGIN { print  ( var1 / var2 ) }')"

	rm btrfs_map_physical.c btrfs_map_physical

	sudo grubby --args="resume=UUID=${swap_file_UUID} resume_offset=${resume_offset}" --update-kernel=ALL


	cat <<-EOF | sudo tee /etc/systemd/system/hibernate-preparation.service
		[Unit]
		Description=Enable swap file and disable zram before hibernate
		Before=systemd-hibernate.service

		[Service]
		User=root
		Type=oneshot
		ExecStart=/bin/bash -c "/usr/sbin/swapon /swap/swapfile && /usr/sbin/swapoff /dev/zram0"

		[Install]
		WantedBy=systemd-hibernate.service
	EOF

	sudo systemctl enable hibernate-preparation.service

	cat <<-EOF | sudo tee /etc/systemd/system/hibernate-resume.service
		[Unit]
		Description=Disable swap after resuming from hibernation
		After=hibernate.target

		[Service]
		User=root
		Type=oneshot
		ExecStart=/usr/sbin/swapoff /swap/swapfile

		[Install]
		WantedBy=hibernate.target
	EOF


	sudo systemctl enable hibernate-resume.service

	sudo mkdir -p /etc/systemd/system/systemd-logind.service.d/

	cat <<-EOF | sudo tee /etc/systemd/system/systemd-logind.service.d/override.conf
		[Service]
		Environment=SYSTEMD_BYPASS_HIBERNATION_MEMORY_CHECK=1
	EOF

	sudo mkdir -p /etc/systemd/system/systemd-hibernate.service.d/

	cat <<-EOF | sudo tee /etc/systemd/system/systemd-hibernate.service.d/override.conf
		[Service]
		Environment=SYSTEMD_BYPASS_HIBERNATION_MEMORY_CHECK=1
	EOF
}


selinux_set_rules(){
	sudo systemctl hibernate
	sudo audit2allow -b
	# Expected output
	# #============= systemd_sleep_t ==============
	# allow systemd_sleep_t unlabeled_t:dir search;
	cd /tmp || exit
	sudo audit2allow -b -M systemd_sleep
	sudo semodule -i systemd_sleep.pp
}


main
exit

## REBOOT, comment 'main' and 'exit' and run the script again, after you reboot.

## Then run:
selinux_set_rules