Update calamares-settings-blankon to implement swapfile on targetted root system

[herpiko]

System without swap is super slow, especially when your app is RAM-hungry. Maybe we need to make the swapfile size dynamic, like

• < 30 GB root partition, use 4GB.

• 30 GB root partition, use half of the size of the RAM.

#!/bin/bash

# Swap file setup script for Calamares
# Usage: setup-swap.sh [ROOT_PATH]

set -e

# Calamares mounts target at this path, or pass as argument
ROOT="${1:-@@ROOT@@}"

SWAP_SIZE="16G"
SWAP_FILE="${ROOT}/swapfile"

echo "Setting up ${SWAP_SIZE} swap file at ${SWAP_FILE}..."

# Create swap file
fallocate -l ${SWAP_SIZE} "${SWAP_FILE}" || dd if=/dev/zero of="${SWAP_FILE}" bs=1G count=16 status=progress

# Set permissions
chmod 600 "${SWAP_FILE}"

# Format as swap
mkswap "${SWAP_FILE}"

# Add to target fstab (path without ROOT prefix)
if ! grep -q '/swapfile' "${ROOT}/etc/fstab"; then
    echo '/swapfile none swap sw 0 0' >> "${ROOT}/etc/fstab"
    echo "Added swap entry to fstab"
else
    echo "Swap entry already exists in fstab"
fi

echo "Swap file setup complete"

Then in shellprocess module,

script:
  - command: "/usr/lib/calamares/scripts/setup-swap.sh @@ROOT@@"
    timeout: 300

[luckynee]

Is this for live session? If not Is it okay if we do this? If im not wrong the user can chooses whether using swap or not in the calamares installation and this will completely override the user settings

[herpiko]

Is this for live session? If not Is it okay if we do this? If im not wrong the user can chooses whether using swap or not in the calamares installation and this will completely override the user settings

If the user does not setup the swap, let's call this script. Most user (like me) just install with "erase the entire disk" and we got no swap.

[luckynee]

Ah i see, then we need to check first whether the user already set up swap, i will need to test where and when we should do the check

[herpiko]

Is this for live session?

@luckynee For installed session.

[herpiko]

My laptop crashes few times a day because of no swap even though it has 32GB RAM. 🤮

[luckynee]

i will make swap file is the default but still leave the swap partition as an option for user that want to use it