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2026-02-11 22:03:06 +00:00
parent 3030d51fd1
commit 547fb2c462
9 changed files with 2038 additions and 0 deletions
@@ -0,0 +1,189 @@
+#!/bin/bash
+
+# =============================================
+# Graphical Environment Manager Script
+# Disables/enables graphical environment to save RAM
+# Must be run with sudo!
+#
+# Usage:
+#   ./gui_manager.sh [enable|disable|status]
+#   GUI_ACTION=enable|disable ./gui_manager.sh
+# =============================================
+
+# --- Configuration ---
+LOG_FILE="/var/log/gui_manager.log"
+
+# --- Functions ---
+
+# Function to check if system uses systemd
+is_systemd() {
+    [ -d /run/systemd/system ] && return 0 || return 1
+}
+
+# Function to get current display manager
+get_display_manager() {
+    if [ -f /etc/X11/default-display-manager ]; then
+        cat /etc/X11/default-display-manager
+    elif systemctl list-units --type=service | grep -q "gdm"; then
+        echo "/usr/sbin/gdm3"
+    elif systemctl list-units --type=service | grep -q "lightdm"; then
+        echo "/usr/sbin/lightdm"
+    elif systemctl list-units --type=service | grep -q "sddm"; then
+        echo "/usr/sbin/sddm"
+    elif systemctl list-units --type=service | grep -q "lxdm"; then
+        echo "/usr/sbin/lxdm"
+    else
+        echo "unknown"
+    fi
+}
+
+# Function to get current target
+get_current_target() {
+    if is_systemd; then
+        systemctl get-default
+    else
+        echo "System doesn't use systemd"
+    fi
+}
+
+# Function to show GUI status
+show_gui_status() {
+    if ! is_systemd; then
+        echo "$(date): System doesn't use systemd" | tee -a "$LOG_FILE"
+        return 1
+    fi
+
+    current_target=$(get_current_target)
+    dm=$(get_display_manager)
+
+    echo "$(date): Current system target: $current_target" | tee -a "$LOG_FILE"
+    echo "$(date): Display Manager: $(basename "$dm")" | tee -a "$LOG_FILE"
+
+    if [ "$current_target" = "graphical.target" ]; then
+        echo "$(date): Graphical environment is ENABLED" | tee -a "$LOG_FILE"
+    else
+        echo "$(date): Graphical environment is DISABLED" | tee -a "$LOG_FILE"
+    fi
+
+    # Show memory usage
+    echo "$(date): Memory usage:" | tee -a "$LOG_FILE"
+    free -h | awk '/^Mem:/ {print "  Total: " $2 ", Used: " $3 ", Free: " $4}' | tee -a "$LOG_FILE"
+}
+
+# Function to disable graphical environment
+disable_gui() {
+    if ! is_systemd; then
+        echo "$(date): Error: This system doesn't use systemd" | tee -a "$LOG_FILE"
+        return 1
+    fi
+
+    current_target=$(get_current_target)
+    if [ "$current_target" != "graphical.target" ]; then
+        echo "$(date): Graphical environment is already disabled" | tee -a "$LOG_FILE"
+        return 0
+    fi
+
+    echo "$(date): Disabling graphical environment..." | tee -a "$LOG_FILE"
+
+    # Get current display manager
+    dm=$(get_display_manager)
+    if [ "$dm" = "unknown" ]; then
+        echo "$(date): Error: Could not determine display manager" | tee -a "$LOG_FILE"
+        return 1
+    fi
+
+    # Show memory usage before
+    echo "$(date): Memory usage before disabling GUI:" | tee -a "$LOG_FILE"
+    free -h | awk '/^Mem:/ {print "  Total: " $2 ", Used: " $3 ", Free: " $4}' | tee -a "$LOG_FILE"
+
+    # Stop display manager
+    echo "$(date): Stopping display manager $(basename "$dm")..." | tee -a "$LOG_FILE"
+    systemctl stop "$(basename "$dm")"
+
+    # Disable graphical target
+    echo "$(date): Setting default target to multi-user.target..." | tee -a "$LOG_FILE"
+    systemctl set-default multi-user.target
+
+    # Show memory usage after
+    echo "$(date): Memory usage after disabling GUI:" | tee -a "$LOG_FILE"
+    free -h | awk '/^Mem:/ {print "  Total: " $2 ", Used: " $3 ", Free: " $4}' | tee -a "$LOG_FILE"
+
+    echo "$(date): Graphical environment disabled successfully" | tee -a "$LOG_FILE"
+    return 0
+}
+
+# Function to enable graphical environment
+enable_gui() {
+    if ! is_systemd; then
+        echo "$(date): Error: This system doesn't use systemd" | tee -a "$LOG_FILE"
+        return 1
+    fi
+
+    current_target=$(get_current_target)
+    if [ "$current_target" = "graphical.target" ]; then
+        echo "$(date): Graphical environment is already enabled" | tee -a "$LOG_FILE"
+        return 0
+    fi
+
+    echo "$(date): Enabling graphical environment..." | tee -a "$LOG_FILE"
+
+    # Get current display manager
+    dm=$(get_display_manager)
+    if [ "$dm" = "unknown" ]; then
+        echo "$(date): Error: Could not determine display manager" | tee -a "$LOG_FILE"
+        return 1
+    fi
+
+    # Enable graphical target
+    echo "$(date): Setting default target to graphical.target..." | tee -a "$LOG_FILE"
+    systemctl set-default graphical.target
+
+    # Start display manager
+    echo "$(date): Starting display manager $(basename "$dm")..." | tee -a "$LOG_FILE"
+    systemctl start "$(basename "$dm")"
+
+    echo "$(date): Graphical environment enabled successfully" | tee -a "$LOG_FILE"
+    return 0
+}
+
+# --- Main Execution ---
+
+# Create log directory if it doesn't exist
+mkdir -p /var/log
+
+# Determine action based on parameters or environment variable
+ACTION=""
+
+# Check for command line parameter
+if [ $# -gt 0 ]; then
+    ACTION="$1"
+fi
+
+# Check for environment variable if no parameter provided
+if [ -z "$ACTION" ] && [ -n "$GUI_ACTION" ]; then
+    ACTION="$GUI_ACTION"
+fi
+
+# Default to status if no action specified
+if [ -z "$ACTION" ]; then
+    ACTION="status"
+fi
+
+# Execute the appropriate action
+case "$ACTION" in
+    disable)
+        disable_gui
+        ;;
+    enable)
+        enable_gui
+        ;;
+    status)
+        show_gui_status
+        ;;
+    *)
+        echo "Usage: $0 [enable|disable|status]"
+        echo "Or: GUI_ACTION=enable|disable $0"
+        echo "Invalid action: $ACTION"
+        exit 1
+        ;;
+esac