#!/bin/sh
# Download and mount squashfs root with overlay

. /tmp/netboot.conf

info "Downloading root filesystem from http://${BOOT_SERVER}/${IMAGE_VERSION}/filesystem.squashfs"

mkdir -p /run/netboot
wget -O /run/netboot/root.squashfs \
    "http://${BOOT_SERVER}/${IMAGE_VERSION}/filesystem.squashfs" || \
    die "Failed to download root filesystem from $BOOT_SERVER"

info "Download complete, mounting filesystems..."

# Mount squashfs (read-only base)
mkdir -p /run/rootfs/lower
mount -t squashfs /run/netboot/root.squashfs /run/rootfs/lower || \
    die "Failed to mount squashfs"

# Create tmpfs for overlay (writable layer)
mkdir -p /run/rootfs/upper /run/rootfs/work
mount -t tmpfs -o size=4G tmpfs /run/rootfs/upper || \
    die "Failed to create tmpfs overlay"
mkdir -p /run/rootfs/upper/upper /run/rootfs/upper/work

# Mount overlay (combines read-only base + writable tmpfs)
mount -t overlay overlay \
    -o lowerdir=/run/rootfs/lower,upperdir=/run/rootfs/upper/upper,workdir=/run/rootfs/upper/work \
    /sysroot || \
    die "Failed to mount overlay"

info "Root filesystem mounted successfully"