Add the ability to hibernate

Builds and installs dynamic-hibernate and enables its associated services. This dynamically creates a swapfile before hibernation, automatically hides the bootloader - pinning the currently booted image - then allowing you to hibernate to the created swapfile. This circumvents the requirement for a swap partition or pre-existing swapfile. It also includes a notifier which alerts the user if and why hibernation fails.

See gitlab.com/evlaV/steamos-customizations/-/commit/3d13dcb03258d237fc0a8dc9d3d74a1da7fe7385 for basis

mkosi.conf.d/70-packages-build.conf

@@ -11,4 +11,5 @@ Packages=boost
          pacman
          python-setproctitle # For kde-builder
          python-yaml # For kde-builder
+         rust
 

mkosi.extra/live/usr/lib/live-setup

@@ -74,3 +74,6 @@ chown -R live:live /home/live/
 # Start the basic-test (if it wants to be started)
 systemctl daemon-reload
 systemctl start --no-block kde-linux-basic-test.service
+
+# Disable hibernation since dynamic-hibernate won't work in a live environment
+systemctl mask hibernate.target

mkosi.extra/usr/lib/systemd/system-preset/50-kde-linux.preset

@@ -33,8 +33,10 @@ enable kde-linux-live-setup.service
 enable kde-linux-volatile-var-lib-flatpak.service
 enable plasma-setup-live-system.service
 enable var-lib-snapd-snap.mount
-# also one of ours but not prefixed with kde-linux- so others can use it too
+# also ours but not prefixed with kde-linux- so others can use it too
 enable etc-factory.service
+enable dynamic-hibernate-prepare.service
+enable dynamic-hibernate-cleanup.service
 
 # networkd - we use networkmanager
 disable systemd-networkd-wait-online.service

mkosi.extra/usr/lib/systemd/user-preset/50-kde-linux.preset

@@ -3,3 +3,7 @@
 
 # Screen reading is opt-in
 disable orca.service
+
+# Sends an error notification if dynamic hibernation fails
+# also ours but not prefixed with kde-linux- so others can use it too
+enable dynamic-hibernate-notifier.service

mkosi.postinst.chroot

@@ -16,6 +16,13 @@ bootctl install
 echo 'timeout 5' >> "$SYSTEMD_ESP_PATH/loader/loader.conf"
 cp /usr/share/edk2-shell/x64/Shell.efi "$SYSTEMD_ESP_PATH/shellx64.efi"
 
+# dynamic-hibernate
+cd /tmp
+git clone --depth 1 https://invent.kde.org/tduck/dynamic-hibernate # TODO: move to kde-linux org and integrate into i18n infra
+cmake -S dynamic-hibernate -B dynamic-hibernate/build -DCMAKE_INSTALL_PREFIX=/usr
+cmake --build dynamic-hibernate/build -v
+cmake --install dynamic-hibernate/build
+
 # Meanwhile cleanup a bit
 ## Unnecessary for us
 pacman --remove --noconfirm qt6-doc qt6-examples || true