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https://github.com/theupriser/steamify-cachyos.git
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#!/bin/bash
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#
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# setup-gamescope-boot.sh
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#
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# Wizard to configure a CachyOS (KDE Plasma + plasma-login-manager) install
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# to always boot into a Steam Deck-style gamescope session, with the
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# ability to switch to Plasma desktop and back, Deck-style, and have it
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# reset to gamescope on the next boot/logout.
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#
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# Covers three real bugs found on CachyOS as of Sep 2026:
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# 1. steam-set-session never writes User= to plasmalogin's autologin
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# config, so plasma-login-manager never actually autologs in.
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# 2. steam-set-session fails outright if /etc/plasmalogin.conf.d is
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# missing, breaking "Switch to Desktop" from inside gamescope.
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# 3. /etc/plasmalogin.conf (the base config) hardcodes Session=plasma
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# and takes priority over anything written to
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# /etc/plasmalogin.conf.d/*.conf, so session switches never stick
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# without a bridge that copies the conf.d value back into the base
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# file, plus Relogin=true so ending a session re-triggers autologin
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# instead of dropping to the greeter.
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#
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# Safe to re-run: it is idempotent and backs up files before editing.
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set -uo pipefail
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# ---------- helpers ----------
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c_reset="\033[0m"; c_bold="\033[1m"; c_green="\033[32m"; c_yellow="\033[33m"; c_red="\033[31m"; c_cyan="\033[36m"
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info() { echo -e "${c_cyan}==>${c_reset} $*"; }
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ok() { echo -e "${c_green}✔${c_reset} $*"; }
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warn() { echo -e "${c_yellow}!${c_reset} $*"; }
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err() { echo -e "${c_red}✘ $*${c_reset}" >&2; }
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ask_yn() {
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local prompt="$1" default="${2:-y}" reply
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local hint="[Y/n]"; [[ "$default" == "n" ]] && hint="[y/N]"
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read -rp "$(echo -e "${c_bold}${prompt}${c_reset} ${hint} ")" reply
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reply="${reply:-$default}"
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[[ "$reply" =~ ^[Yy]$ ]]
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}
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require_root_helper() {
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# Re-exec any privileged step through sudo rather than requiring the
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# whole script to run as root, so $HOME/whoami stay correct for the
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# target user detection below.
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if [[ $EUID -eq 0 && -z "${SUDO_USER:-}" ]]; then
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err "Please run this script as your normal user (it will call sudo itself), not directly as root."
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exit 1
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fi
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}
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backup_file() {
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local f="$1"
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if [[ -f "$f" && ! -f "${f}.bak-gamescope-wizard" ]]; then
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sudo cp -a "$f" "${f}.bak-gamescope-wizard"
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info "Backed up $f -> ${f}.bak-gamescope-wizard"
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fi
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}
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# ---------- start ----------
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require_root_helper
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echo -e "${c_bold}CachyOS Steam Deck-style Gamescope Boot Wizard${c_reset}"
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echo "This sets your machine up to always boot into gamescope (like SteamOS),"
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echo "with working Switch-to-Desktop and switch-back, surviving reboots."
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echo
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if ! command -v pacman >/dev/null 2>&1; then
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err "This doesn't look like an Arch/CachyOS system (no pacman found). Aborting."
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exit 1
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fi
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TARGET_USER="${SUDO_USER:-$USER}"
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read -rp "$(echo -e "${c_bold}Which user should autologin into gamescope?${c_reset} [${TARGET_USER}] ")" input_user
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TARGET_USER="${input_user:-$TARGET_USER}"
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if ! id "$TARGET_USER" >/dev/null 2>&1; then
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err "User '$TARGET_USER' does not exist on this system."
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exit 1
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fi
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ok "Using user: $TARGET_USER"
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echo
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# ---------- 1. Login manager check ----------
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DM="$(systemctl show -p Id --value display-manager 2>/dev/null | sed 's/\.service$//')"
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info "Detected display manager: ${DM:-none}"
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if [[ "$DM" != "plasmalogin" ]]; then
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warn "This wizard was built and tested against plasma-login-manager (plasmalogin)."
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warn "Detected display manager is '${DM:-unknown}'. SDDM setups don't need"
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warn "most of these workarounds (SDDM's own Autologin works out of the box);"
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warn "this script will still try, but review the output carefully."
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ask_yn "Continue anyway?" n || exit 0
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fi
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echo
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# ---------- 2. Install packages ----------
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info "Checking required packages: gamescope-session-cachyos, steam, mangohud"
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MISSING=()
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for pkg in gamescope-session-cachyos steam mangohud; do
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pacman -Qi "$pkg" >/dev/null 2>&1 || MISSING+=("$pkg")
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done
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if [[ ${#MISSING[@]} -gt 0 ]]; then
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info "Missing packages: ${MISSING[*]}"
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if ask_yn "Install them now?"; then
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sudo pacman -S --needed "${MISSING[@]}"
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else
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err "Cannot continue without these packages."
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exit 1
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fi
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else
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ok "All required packages already installed."
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fi
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echo
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# ---------- 3. Ensure plasmalogin.conf.d exists (fixes Switch-to-Desktop crash) ----------
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info "Ensuring /etc/plasmalogin.conf.d exists (fixes the 'Switching to Desktop' hang bug)"
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sudo mkdir -p /etc/plasmalogin.conf.d
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ok "Directory present."
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echo
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# ---------- 4. Fix the base /etc/plasmalogin.conf ----------
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#
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# steam-set-session only ever writes to /etc/plasmalogin.conf.d/*.conf,
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# but the base /etc/plasmalogin.conf takes priority and, as shipped by
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# CachyOS, hardcodes Session=plasma with no User= and no Relogin=. We
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# rewrite the [Autologin] block cleanly here.
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BASE_CONF="/etc/plasmalogin.conf"
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info "Configuring $BASE_CONF (Session=gamescope-session.desktop, User=$TARGET_USER, Relogin=true)"
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backup_file "$BASE_CONF"
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sudo touch "$BASE_CONF"
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# Strip any existing [Autologin] section (from the first [Autologin] line
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# to the next section header or EOF), then append a clean one. This is
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# safer than a series of seds for an unknown starting state.
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sudo awk '
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BEGIN { in_autologin=0 }
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/^\[Autologin\]/ { in_autologin=1; next }
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/^\[/ { in_autologin=0 }
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!in_autologin { print }
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' "$BASE_CONF" | sudo tee "${BASE_CONF}.tmp" > /dev/null
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sudo mv "${BASE_CONF}.tmp" "$BASE_CONF"
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sudo tee -a "$BASE_CONF" > /dev/null << EOF
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[Autologin]
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Session=gamescope-session.desktop
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User=$TARGET_USER
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Relogin=true
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EOF
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ok "Base autologin config written:"
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sudo sed -n '/\[Autologin\]/,/^\[/p' "$BASE_CONF" | head -n -1 2>/dev/null || sudo cat "$BASE_CONF"
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echo
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# ---------- 5. Clean up any stray conf.d autologin fragments from manual attempts ----------
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info "Removing any leftover manual conf.d autologin overrides (base config now handles it)"
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sudo rm -f /etc/plasmalogin.conf.d/zzz-steamos-autologin*.conf
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ok "Cleaned."
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echo
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# ---------- 6. Install the sync bridge: conf.d -> base config ----------
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#
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# CachyOS's own tools (steamos-session-select, Steam's "Switch to
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# Desktop", and cachyos-gamescope-autologin.service) only ever write the
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# session choice to /etc/plasmalogin.conf.d/zz-steamos-autologin.conf.
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# Since the base config wins, we need a watcher that copies that value
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# into the base file whenever it changes.
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SYNC_SCRIPT="/usr/local/bin/sync-steamos-session.sh"
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info "Installing session sync bridge at $SYNC_SCRIPT"
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sudo tee "$SYNC_SCRIPT" > /dev/null << 'EOF'
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#!/bin/bash
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# Copies the Session= value CachyOS's steamos tools write into
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# /etc/plasmalogin.conf.d/zz-steamos-autologin.conf back into the base
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# /etc/plasmalogin.conf, which plasma-login-manager actually obeys.
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SRC="/etc/plasmalogin.conf.d/zz-steamos-autologin.conf"
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DEST="/etc/plasmalogin.conf"
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[[ -f "$SRC" ]] || exit 0
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SESSION=$(grep -oP '^Session=\K.*' "$SRC")
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[[ -z "$SESSION" ]] && exit 0
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if grep -q '^Session=' "$DEST"; then
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sed -i "s|^Session=.*|Session=$SESSION|" "$DEST"
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else
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echo "Session=$SESSION" >> "$DEST"
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fi
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EOF
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sudo chmod +x "$SYNC_SCRIPT"
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ok "Sync script installed."
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echo
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# ---------- 7. systemd path watcher + service ----------
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info "Installing systemd path watcher so session switches take effect immediately"
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sudo tee /etc/systemd/system/sync-steamos-session.path > /dev/null << 'EOF'
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[Unit]
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Description=Watch for steamos session changes
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[Path]
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PathModified=/etc/plasmalogin.conf.d/zz-steamos-autologin.conf
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[Install]
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WantedBy=multi-user.target
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EOF
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sudo tee /etc/systemd/system/sync-steamos-session.service > /dev/null << 'EOF'
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[Unit]
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Description=Sync steamos session selection into plasmalogin.conf
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[Service]
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Type=oneshot
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ExecStart=/usr/local/bin/sync-steamos-session.sh
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EOF
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sudo systemctl daemon-reload
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sudo systemctl enable --now sync-steamos-session.path
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ok "Path watcher enabled."
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echo
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# ---------- 8. Run it once now so current state is in sync ----------
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info "Running the sync once now to align current state"
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sudo systemctl start sync-steamos-session.service
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ok "Done. Current base config:"
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sudo cat "$BASE_CONF"
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echo
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# ---------- 9. Summary + reboot ----------
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echo -e "${c_bold}Setup complete.${c_reset}"
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echo "What this did:"
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echo " - Installed gamescope-session-cachyos, steam, mangohud (if missing)"
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echo " - Created /etc/plasmalogin.conf.d (fixes Switch-to-Desktop crash)"
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echo " - Set $BASE_CONF to autologin '$TARGET_USER' into gamescope, with Relogin=true"
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echo " - Installed a sync bridge + systemd watcher so Steam's Switch-to-Desktop"
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echo " (and cachyos-gamescope-autologin.service resetting back to gamescope"
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echo " on logout) both actually take effect"
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echo
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echo "Backups of any files this script modified were saved with a"
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echo ".bak-gamescope-wizard suffix next to the original."
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echo
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echo "To manually flip sessions any time:"
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echo " steamos-session-select gamescope # boot straight into gamescope now"
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echo " steamos-session-select plasma # boot straight into desktop now"
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echo " steamos-session-select persistent # remember last-used session across reboots"
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echo " steamos-session-select oneshot # always start in gamescope regardless (default Deck behavior)"
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echo
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if ask_yn "Reboot now to test it?" n; then
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sudo reboot
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else
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info "Skipping reboot. Run 'sudo reboot' whenever you're ready to test."
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fi
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