Update 'k3os/set_hostname.sh'

k3os/set_hostname.sh

@@ -1,14 +1,22 @@
 #!/bin/bash
 
-# Script to set the hostname in the k3os config.yaml file.
-# It handles the read-only filesystem constraint of a running k3OS system.
+# Script to set the hostname for k3OS by writing directly to the hostname file.
+# This script requires root privileges and prompts the user for the new hostname.
 
-# Define the path to the config file and the mount point
-CONFIG_FILE="/k3os/system/config.yaml"
-CONFIG_DIR="/k3os/system"
+HOSTNAME_FILE="/var/lib/rancher/k3os/hostname"
+
+# --- Function to check for root/sudo privileges ---
+check_privileges() {
+    if [[ $EUID -ne 0 ]]; then
+        echo "Error: This script must be run with root/sudo privileges."
+        echo "Please run: sudo $0"
+        exit 1
+    fi
+}
 
 # --- Function to get user input ---
 get_hostname_input() {
+    # Loop until a non-empty hostname is provided
     while true; do
         read -r -p "Enter the desired new hostname: " NEW_HOSTNAME
         if [ -n "$NEW_HOSTNAME" ]; then
@@ -19,61 +27,31 @@ get_hostname_input() {
     done
 }
 
-# --- Function to modify the config file ---
-set_hostname() {
+# --- Function to write the hostname to the file ---
+write_hostname() {
     local NEW_HOSTNAME="$1"
-    # Note the two spaces for YAML indentation under 'k3os:'
-    local HOSTNAME_ENTRY="  hostname: $NEW_HOSTNAME" 
     
-    echo "Attempting to set hostname to: **$NEW_HOSTNAME**"
-    echo "Config file location: **$CONFIG_FILE**"
+    echo "Attempting to write new hostname: **$NEW_HOSTNAME** to **$HOSTNAME_FILE**"
     
-    # 1. Remount the filesystem as read/write (rw)
-    echo "Attempting to remount $CONFIG_DIR as read/write..."
-    if ! mount -o remount,rw "$CONFIG_DIR"; then
-        echo "Error: Failed to remount $CONFIG_DIR as read/write. Aborting."
-        exit 1
-    fi
-    echo "Filesystem successfully remounted as read/write."
-
-    # 2. Modify the config file (same logic as before)
-    if ! grep -q "^k3os:" "$CONFIG_FILE"; then
-        echo "'k3os:' block not found. Appending the block and hostname."
-        echo -e "\nk3os:\n$HOSTNAME_ENTRY" >> "$CONFIG_FILE"
+    # Write the new hostname, ensuring no extra whitespace or newlines
+    echo -n "$NEW_HOSTNAME" > "$HOSTNAME_FILE"
     
-    elif grep -q "^k3os:" "$CONFIG_FILE" && grep -q "^\s\+hostname:" "$CONFIG_FILE"; then
-        echo "Existing hostname found. Replacing the entry."
-        sed -i "/^\s*hostname:/c\\$HOSTNAME_ENTRY" "$CONFIG_FILE"
-        
-    else
-        echo "'k3os:' block found, but no hostname entry. Appending the entry."
-        sed -i "/^k3os:/a\\$HOSTNAME_ENTRY" "$CONFIG_FILE"
-    fi
-
-    local MODIFICATION_STATUS=$?
-
-    # 3. Remount the filesystem back to read-only (ro)
-    echo "Remounting $CONFIG_DIR back to read-only..."
-    if ! mount -o remount,ro "$CONFIG_DIR"; then
-        echo "Warning: Failed to remount $CONFIG_DIR back to read-only. Proceeding..."
-    fi
-
-    echo -e "$HOSTNAME_ENTRY" > /var/lib/rancher/k3os/hostname
-
-    # 4. Report status
-    if [ $MODIFICATION_STATUS -eq 0 ]; then
+    # Check if the write operation was successful
+    if [ $? -eq 0 ]; then
+        echo "Success: The new hostname has been written to $HOSTNAME_FILE."
         echo ""
-        echo "Successfully updated the hostname in $CONFIG_FILE."
-        echo "The change will take effect after a **reboot**."
+        echo "--- Verification ---"
+        echo "File content: $(cat "$HOSTNAME_FILE")"
         echo ""
-        echo "--- Verification (Hostname line only) ---"
-        grep -E "^\s*hostname:" "$CONFIG_FILE"
+        echo "Action Required: A **system reboot is necessary** for the new hostname to take effect."
+        echo "You can reboot now using the 'reboot' command."
     else
-        echo "Error: Failed to modify $CONFIG_FILE during step 2."
+        echo "Error: Failed to write to $HOSTNAME_FILE. Check file permissions or disk status."
         exit 1
     fi
 }
 
 # --- Main execution ---
+check_privileges
 get_hostname_input
-set_hostname "$NEW_HOSTNAME"
+write_hostname "$NEW_HOSTNAME"