Imported scripts, configuration files and examples from a private repository

examples/archlinux/enable-hibernation-from-swapfile.sh

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+#!/bin/sh
+
+# enable hibernation from a swapfile on btrfs
+
+# source:
+#  - https://wiki.archlinux.org/title/Power_management/Suspend_and_hibernate
+
+sudo mkdir /swap
+
+# disable copy-on-write and compression on the directory
+sudo chattr -R +C /swap
+sudo btrfs property set /swap compression none
+
+# create the swapfile
+sudo fallocate -l 32GiB /swap/swapfile
+sudo chmod -R 600 /swap
+sudo mkswap --label swap /swap/swapfile
+sudo swapon /swap/swapfile
+
+# configure swappiness
+sudo nano /etc/sysctl.d/swappiness
+sudo sysctl --load=/etc/sysctl.d/swappiness
+
+# identify the swap device
+# value is to be used for the resume=UUID= kernel parameter
+sudo findmnt -no UUID -T /swap/swapfile
+
+# identify the file offset
+# value is to be used for the resume_offset= kernel parameter
+curl --location --output /tmp/btrfs_map_physical.c https://raw.githubusercontent.com/osandov/osandov-linux/master/scripts/btrfs_map_physical.c
+gcc -O2 -o /tmp/btrfs_map_physical /tmp/btrfs_map_physical.c
+chmod a+x /tmp/btrfs_map_physical
+physical_offset=$(sudo /tmp/btrfs_map_physical /swap/swapfile | awk '$1==0 {print $NF}')  # last column of the line starting with 0
+resume_offset=$(( ${physical_offset} / $(getconf PAGESIZE) ))
+
+# configure the bootloader
+# GRUB_CMDLINE_LINUX_DEFAULT="quiet cryptdevice=UUID=... resume=UUID=bac7930a-924d-4e9d-83eb-ad6ce5a8100a resume_offset=1865170"
+sudo nano /etc/default/grub
+sudo grub-mkconfig -o /boot/grub/grub.cfg
+
+# configure the mkinitcpio
+# not needed if using the systemd hook
+# add resume after filesystems: HOOKS=(base ... filesystems resume fsck)
+sudo nano /etc/mkinitcpio.conf
+mkinitcpio -p linux
+
+# reboot
+
+# check with `systemctl hibernate`