Automatically hide systemd-boot menu on blessed boot

Adds a service which checks if the boot was successfully blessed and if the user does not have any other operating systems installed. If this is the case, hide systemd-boot for the next bootup, assuming the user doesn't force shut down the system and uptime is greater than 5 minutes.

mkosi.extra/usr/lib/auto-hide-bootloader

@@ -0,0 +1,30 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+# SPDX-FileCopyrightText: 2025 Thomas Duckworth <tduck@filotimoproject.org>
+
+set -eu
+
+case "${1:-}" in
+    show)
+        /usr/bin/bootctl set-timeout ""
+        ;;
+    hide)
+        OTHER_OS_COUNT="$(bootctl list | grep "^\s*id:" | grep -vE "kde-linux_.*\.efi|auto-efi-shell|auto-reboot-to-firmware-setup" | wc -l)"
+        if [ "$OTHER_OS_COUNT" -gt 0 ]; then
+            echo "Multiple operating systems detected, not hiding bootloader."
+            exit 0
+        fi
+        UPTIME_SECONDS="$(cut -d. -f1 /proc/uptime)"
+        if [ "$UPTIME_SECONDS" -lt 300 ]; then
+            echo "System uptime was less than 5 minutes, not hiding bootloader."
+            exit 0
+        fi
+        if [ "$(systemctl show -p Result --value kde-linux-bless-boot.service 2>/dev/null || echo "failed")" = "success" ]; then
+            /usr/bin/bootctl set-timeout 0
+        fi
+        ;;
+    *)
+        echo "Usage: $0 {show|hide}"
+        exit 1
+        ;;
+esac

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

@@ -30,6 +30,7 @@ enable nvidia-resume.service
 enable kde-linux-btrfs.service
 enable kde-linux-live-setup.service
 enable kde-linux-volatile-var-lib-flatpak.service
+enable kde-linux-auto-hide-bootloader.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

mkosi.extra/usr/lib/systemd/system/kde-linux-auto-hide-bootloader.service

@@ -0,0 +1,21 @@
+# SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+# SPDX-FileCopyrightText: 2025 Thomas Duckworth <tduck@filotimoproject.org>
+
+[Unit]
+Description=Automatically hide the bootloader if the image is good
+After=local-fs.target
+Before=kde-linux-bless-boot.service
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+# If the system either is not blessed or is forcibly shut down for some reason,
+# the boot menu timeout is reset to default, and the menu is shown.
+ExecStart=/usr/lib/auto-hide-bootloader show
+# If the boot was blessed, the user shuts the system down normally, and the uptime
+# is greater than 5 minutes, the bootloader is hidden, because the current image should work.
+# This is idempotent if more than one operating system is installed.
+ExecStop=/usr/lib/auto-hide-bootloader hide
+
+[Install]
+WantedBy=kde-linux-bless-boot.service