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77 lines
2.6 KiB
Bash
77 lines
2.6 KiB
Bash
#!/bin/bash
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# Script to set the hostname in the k3os config.yaml file.
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# It handles the read-only filesystem constraint of a running k3OS system.
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# Define the path to the config file and the mount point
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CONFIG_FILE="/k3os/system/config.yaml"
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CONFIG_DIR="/k3os/system"
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# --- Function to get user input ---
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get_hostname_input() {
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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**"
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echo "Config file location: **$CONFIG_FILE**"
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# 1. Remount the filesystem as read/write (rw)
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echo "Attempting to remount $CONFIG_DIR as read/write..."
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if ! mount -o remount,rw "$CONFIG_DIR"; then
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echo "Error: Failed to remount $CONFIG_DIR as read/write. Aborting."
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exit 1
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fi
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echo "Filesystem successfully remounted as read/write."
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# 2. Modify the config file (same logic as before)
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if ! grep -q "^k3os:" "$CONFIG_FILE"; then
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echo "'k3os:' block not found. Appending the block and hostname."
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echo -e "\nk3os:\n$HOSTNAME_ENTRY" >> "$CONFIG_FILE"
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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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sed -i "/^\s*hostname:/c\\$HOSTNAME_ENTRY" "$CONFIG_FILE"
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else
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echo "'k3os:' block found, but no hostname entry. Appending the entry."
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sed -i "/^k3os:/a\\$HOSTNAME_ENTRY" "$CONFIG_FILE"
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fi
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local MODIFICATION_STATUS=$?
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# 3. Remount the filesystem back to read-only (ro)
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echo "Remounting $CONFIG_DIR back to read-only..."
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if ! mount -o remount,ro "$CONFIG_DIR"; then
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echo "Warning: Failed to remount $CONFIG_DIR back to read-only. Proceeding..."
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fi
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# 4. Report status
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if [ $MODIFICATION_STATUS -eq 0 ]; then
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echo ""
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echo "Successfully updated the hostname in $CONFIG_FILE."
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echo "The change will take effect after a **reboot**."
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echo ""
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echo "--- Verification (Hostname line only) ---"
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grep -E "^\s*hostname:" "$CONFIG_FILE"
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else
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echo "Error: Failed to modify $CONFIG_FILE during step 2."
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exit 1
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fi
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}
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# --- Main execution ---
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get_hostname_input
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set_hostname "$NEW_HOSTNAME" |