From da6877af61d5e9bed1a1ec9361c40ab4e377c7fd Mon Sep 17 00:00:00 2001
From: Mattia Mascarello <mattia@mattiamascarello.it>
Date: Wed, 14 Jan 2026 01:48:38 +0100
Subject: [PATCH] First commit

---
 lightdm_add.conf      |  3 +++
 notice.py             | 31 +++++++++++++++++++++++++++++++
 prepare-guest-home.sh | 34 ++++++++++++++++++++++++++++++++++
 3 files changed, 68 insertions(+)
 create mode 100644 lightdm_add.conf
 create mode 100755 notice.py
 create mode 100644 prepare-guest-home.sh

diff --git a/lightdm_add.conf b/lightdm_add.conf
new file mode 100644
index 0000000..b32a168
--- /dev/null
+++ b/lightdm_add.conf
@@ -0,0 +1,3 @@
+[Seat:*]
+session-setup-script=/usr/local/sbin/prepare-guest-home.sh
+session-cleanup-script=/usr/local/sbin/prepare-guest-home.sh
diff --git a/notice.py b/notice.py
new file mode 100755
index 0000000..c0fd5cd
--- /dev/null
+++ b/notice.py
@@ -0,0 +1,31 @@
+#!/usr/bin/env python3
+# To put in home directory autoexec
+import sys
+from PyQt5.QtWidgets import QApplication, QMessageBox
+from PyQt5.QtCore import Qt
+
+# Create a Qt application
+app = QApplication(sys.argv)
+
+# Create a message box
+msg = QMessageBox()
+msg.setIcon(QMessageBox.Information)
+
+msg.setWindowTitle("Welcome into the guest account!")
+msg.setText("Welcome!\nThis is an ephemeral session.\n\nAll the changes made will be reverted at logout.\nPlease save your work elsewhere.\n\nFor more information, contact the administrator.")
+msg.setStandardButtons(QMessageBox.Ok)
+
+
+
+
+# Set the window flags to remove all buttons (minimize, maximize, close)
+msg.setWindowFlags(Qt.Dialog | Qt.FramelessWindowHint | Qt.WindowStaysOnTopHint)
+
+# Disable resizing by setting a fixed size
+msg.setFixedSize(400, 200)
+
+# Make the window modal (optional, to block interaction with other windows)
+msg.setWindowModality(Qt.ApplicationModal)
+
+# Show the message box in the center of the screen
+msg.exec_()
diff --git a/prepare-guest-home.sh b/prepare-guest-home.sh
new file mode 100644
index 0000000..06fc23e
--- /dev/null
+++ b/prepare-guest-home.sh
@@ -0,0 +1,34 @@
+set -euo pipefail
+
+if [ "$USER" != "guest" ]; then
+    exit 0
+fi
+
+GUEST_HOME="/home/guest"
+SKELETON="/home/guest-freeze"
+
+# Validate guest home directory: check if it's a symlink
+if [ -L "$GUEST_HOME" ]; then
+    echo "Home directory is a symlink. Removing it and restoring as a directory."
+    rm -f "$GUEST_HOME"  # Remove the symlink
+    
+    # Recreate the home directory as a proper directory
+    mkdir -p "$GUEST_HOME"
+fi
+
+# Validate guest home directory exists and is not a symlink
+if [ ! -d "$GUEST_HOME" ]; then
+    echo "Unsafe guest home or home directory creation failed."
+    exit 1
+fi
+
+# Remove contents safely (if any) while ignoring "file not found" errors
+find "$GUEST_HOME" -mindepth 1 -xdev -exec rm -rf -- {} + 2>/dev/null || true
+
+# Restore skeleton safely
+rsync -a --safe-links --no-devices --no-specials \
+      "$SKELETON"/ "$GUEST_HOME"/
+
+# Fix ownership and permissions
+chown -R guest:guest "$GUEST_HOME"
+chmod 700 "$GUEST_HOME"