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67 lines
2.5 KiB
Bash
67 lines
2.5 KiB
Bash
#!/bin/bash
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# Script to set the hostname in the k3os config.yaml file using only standard tools (sed, grep).
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# Define the path to the config file
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CONFIG_FILE="/k3os/system/config.yaml"
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# --- Function to get user input ---
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get_hostname_input() {
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# Loop until a non-empty hostname is provided
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while true; do
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read -r -p "Enter the desired new hostname: " NEW_HOSTNAME
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if [ -n "$NEW_HOSTNAME" ]; then
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break
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else
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echo "Error: Hostname cannot be empty. Please enter a valid name."
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fi
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done
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}
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# --- Function to modify the config file ---
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set_hostname() {
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local NEW_HOSTNAME="$1"
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# Note the two spaces for YAML indentation under 'k3os:'
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local HOSTNAME_ENTRY=" hostname: $NEW_HOSTNAME"
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echo "Attempting to set hostname to: **$NEW_HOSTNAME** in **$CONFIG_FILE**"
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# 1. Check if the 'k3os:' block exists
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if ! grep -q "^k3os:" "$CONFIG_FILE"; then
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echo "'k3os:' block not found. Appending the block and hostname."
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# Append the k3os block and the new hostname entry
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echo -e "\nk3os:\n$HOSTNAME_ENTRY" >> "$CONFIG_FILE"
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# 2. Check if a 'hostname' entry already exists under 'k3os:'
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# Checks for the 'k3os:' block AND an indented 'hostname:' line
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elif grep -q "^k3os:" "$CONFIG_FILE" && grep -q "^\s\+hostname:" "$CONFIG_FILE"; then
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echo "Existing hostname found. Replacing the entry."
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# Use sed to replace the existing hostname line under k3os
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# /^\s*hostname:/ matches any line starting with optional spaces followed by 'hostname:'
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sed -i "/^\s*hostname:/c\\$HOSTNAME_ENTRY" "$CONFIG_FILE"
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# 3. 'k3os:' exists but 'hostname:' does not.
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else
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echo "'k3os:' block found, but no hostname entry. Appending the entry."
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# Use sed to insert the new hostname entry immediately after the 'k3os:' line
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# The 'a\' command appends text after the matched line
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sed -i "/^k3os:/a\\$HOSTNAME_ENTRY" "$CONFIG_FILE"
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fi
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# Check the exit status of the previous command
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if [ $? -eq 0 ]; then
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echo "Successfully updated the hostname in $CONFIG_FILE."
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echo "The change will take effect after a reboot."
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echo ""
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echo "--- Verification (Hostname line only) ---"
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# Print the modified line for verification
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grep -E "^\s*hostname:" "$CONFIG_FILE"
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else
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echo "Failed to modify $CONFIG_FILE."
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exit 1
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fi
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}
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# --- Main execution ---
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get_hostname_input
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set_hostname "$NEW_HOSTNAME" |