From 2b420c119e51c9313991eaae02b5a729b169bbf5 Mon Sep 17 00:00:00 2001
From: Nick Heppler <nick@nickhepler.com>
Date: Sat, 28 Dec 2024 11:22:28 -0500
Subject: [PATCH] Sets the system timezone based on geolocation or user input.

---
 setup.sh | 114 +++++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 106 insertions(+), 8 deletions(-)

diff --git a/setup.sh b/setup.sh
index a49c40b..43390ea 100644
--- a/setup.sh
+++ b/setup.sh
@@ -1,10 +1,22 @@
 #!/bin/bash
-
-# Script to update a RHEL-based Linux system, set the timezone, change the hostname,
-# add a limited user account, modify sshd_config settings, and optionally install Docker CE
+#
+# Script to perform system maintenance on a RHEL-based Linux system.
+# 
+# This script:
+#  - Updates package manager and installed packages
+#  - Sets the system timezone based on geolocation or user input
+#  - Changes the system hostname and updates /etc/hosts
+#  - Creates a limited user account and modifies SSH settings
+#  - Optionally installs Docker CE
+#
+# Prerequisites:
+#  - The script must be run as root or with sudo privileges
+#
+# Usage:
+#  - Run the script directly on the system or via SSH.
+#  - Respond to prompts as required during the script execution.
 
 # Variables
-timezone="America/New_York"
 sshd_config="/etc/ssh/sshd_config"
 docker_installed=false
 
@@ -53,6 +65,8 @@ install_docker() {
     usermod -aG docker "$username"
     echo "User $username added to the docker group."
 
+    # Clean up get-docker.sh
+    rm -f get-docker.sh
 }
 
 # Function to create a limited user account
@@ -60,6 +74,13 @@ create_user_account() {
     read -p "Please enter the username for the new user account: " username
     read -sp "Please enter the password for the new user account: " password
     echo
+    read -sp "Please confirm the password: " password_confirm
+    echo
+
+    if [ "$password" != "$password_confirm" ]; then
+        echo "Passwords do not match. Exiting."
+        exit 1
+    fi
 
     # Create the user and add to the wheel group
     if id "$username" &>/dev/null; then
@@ -97,8 +118,81 @@ elif command -v yum &> /dev/null; then
 fi
 
 # Change the timezone
-echo "Setting timezone to $timezone..."
-timedatectl set-timezone "$timezone"
+
+# Function to set the timezone to UTC in case of an error
+set_utc_timezone() {
+  echo "Error occurred while determining the timezone. Falling back to UTC."
+  timedatectl set-timezone UTC
+}
+
+# Function to get the timezone from the ipinfo.io API
+get_timezone_from_api() {
+  # Fetch geolocation information using the ipinfo.io API
+  response=$(curl -s https://ipinfo.io)
+
+  # Check if the curl command succeeded and the response contains the 'timezone' field
+  if [ $? -eq 0 ] && echo "$response" | grep -q "timezone"; then
+    # Extract the timezone directly from the JSON response
+    timezone=$(echo "$response" | jq -r '.timezone')
+
+    echo "Detected timezone: $timezone"
+    return 0
+  else
+    set_utc_timezone
+    return 1
+  fi
+}
+
+# Function to prompt the user to choose a timezone
+prompt_for_timezone() {
+  echo ""
+  echo "Choose a timezone option:"
+  echo "1) Use the detected timezone ($1)"
+  echo "2) Use UTC"
+  echo "3) Enter a custom timezone"
+  
+  # Read user choice
+  read -p "Enter the number corresponding to your choice: " choice
+  
+  case "$choice" in
+    1)
+      echo "You chose to use the detected timezone: $1"
+      timedatectl set-timezone "$1"
+      ;;
+    2)
+      echo "You chose to use UTC."
+      timedatectl set-timezone UTC
+      ;;
+    3)
+      # Ask for a custom timezone
+      read -p "Enter your preferred timezone (e.g., Europe/London, America/New_York): " custom_timezone
+
+      if timedatectl list-timezones | grep -q "$custom_timezone"; then
+          timedatectl set-timezone "$custom_timezone"
+      else
+          echo "Invalid timezone. Falling back to UTC."
+          timedatectl set-timezone UTC
+      fi
+      ;;
+    *)
+      echo "Invalid choice. Falling back to UTC."
+      timedatectl set-timezone UTC
+      ;;
+  esac
+}
+
+# Main script execution starts here
+echo "Attempting to detect and set the timezone..."
+
+# Try to get the detected timezone from the API
+if get_timezone_from_api; then
+  # If the timezone was successfully detected, prompt the user for their choice
+  prompt_for_timezone "$timezone"
+else
+  # If no timezone was detected, ask the user to fall back to UTC
+  echo "Unable to detect timezone. Falling back to UTC."
+  timedatectl set-timezone UTC
+fi
 
 # Change the hostname
 prompt_for_hostname
@@ -115,7 +209,11 @@ create_user_account
 echo "Modifying SSH configuration..."
 if [ -f "$sshd_config" ]; then
     # Set PermitRootLogin to no
-    sed -i 's/^PermitRootLogin .*/PermitRootLogin no/' "$sshd_config" || echo "PermitRootLogin no" >> "$sshd_config"
+    if ! grep -q "^PermitRootLogin" "$sshd_config"; then
+        echo "PermitRootLogin no" >> "$sshd_config"
+    else
+        sed -i 's/^PermitRootLogin.*/PermitRootLogin no/' "$sshd_config"
+    fi
 
     # Set PasswordAuthentication to no
     if grep -q '^#PasswordAuthentication' "$sshd_config"; then
@@ -167,4 +265,4 @@ elif command -v yum &> /dev/null; then
     yum -y autoremove
 fi
 
-echo "System update complete! Timezone set to $timezone, hostname set to $hostname, limited user created, sshd_config modified, and Docker installation completed if selected."
\ No newline at end of file
+echo "System update complete! Timezone set to ${timezone:-UTC}, hostname set to $hostname, limited user created, sshd_config modified, and Docker installation completed if selected."