wip

toolchain/scripts/000-setup-disk.sh

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+#!/bin/bash
+# ============================================================================
+# DarkForge Linux — Phase 0: Create LFS Build Partition (Loopback)
+# ============================================================================
+# Purpose:  Create a loopback ext4 filesystem for the LFS build environment.
+#           This avoids repartitioning and uses free space on your root drive.
+#           The loopback file acts exactly like a real partition.
+# Inputs:   None (uses defaults below, override via environment)
+# Outputs:  50GB ext4 filesystem mounted at /mnt/darkforge
+# Assumes:  Running as root, ~50GB free on root filesystem
+# ============================================================================
+
+set -euo pipefail
+
+# --- Configuration -----------------------------------------------------------
+LFS="${LFS:-/mnt/darkforge}"
+LFS_IMAGE="${LFS_IMAGE:-/opt/darkforge.img}"
+LFS_SIZE="${LFS_SIZE:-50G}"
+
+# Color output
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+NC='\033[0m'
+
+ok()   { echo -e "${GREEN}>>> $*${NC}"; }
+warn() { echo -e "${YELLOW}>>> $*${NC}"; }
+fail() { echo -e "${RED}>>> $*${NC}"; exit 1; }
+
+# --- Verify running as root --------------------------------------------------
+[ "$(id -u)" -eq 0 ] || fail "This script must be run as root."
+
+echo "============================================================"
+echo " DarkForge Linux — LFS Build Partition Setup"
+echo "============================================================"
+echo ""
+echo "  Image file:  ${LFS_IMAGE}"
+echo "  Image size:  ${LFS_SIZE}"
+echo "  Mount point: ${LFS}"
+echo ""
+
+# --- Check if already mounted ------------------------------------------------
+if mountpoint -q "${LFS}" 2>/dev/null; then
+    ok "${LFS} is already mounted:"
+    df -h "${LFS}"
+    echo ""
+    echo "To start over: umount ${LFS} && rm ${LFS_IMAGE}"
+    exit 0
+fi
+
+# --- Check free space ---------------------------------------------------------
+AVAIL_KB=$(df --output=avail / | tail -1 | tr -d ' ')
+AVAIL_GB=$((AVAIL_KB / 1024 / 1024))
+NEED_GB=$(echo "${LFS_SIZE}" | sed 's/G//')
+
+if [ "${AVAIL_GB}" -lt "${NEED_GB}" ]; then
+    fail "Not enough free space: ${AVAIL_GB}GB available, need ${NEED_GB}GB"
+fi
+ok "Free space check: ${AVAIL_GB}GB available, need ${NEED_GB}GB"
+
+# --- Create the loopback image -----------------------------------------------
+if [ -f "${LFS_IMAGE}" ]; then
+    warn "Image file already exists: ${LFS_IMAGE}"
+    echo "  Reusing existing image."
+else
+    echo ">>> Creating ${LFS_SIZE} image file (this takes a moment)..."
+    # Use fallocate for instant allocation (no slow dd)
+    fallocate -l "${LFS_SIZE}" "${LFS_IMAGE}" || {
+        warn "fallocate failed, falling back to truncate..."
+        truncate -s "${LFS_SIZE}" "${LFS_IMAGE}"
+    }
+    ok "Image created: ${LFS_IMAGE}"
+
+    echo ">>> Formatting as ext4..."
+    mkfs.ext4 -q -L darkforge "${LFS_IMAGE}"
+    ok "Formatted as ext4"
+fi
+
+# --- Mount it -----------------------------------------------------------------
+mkdir -p "${LFS}"
+mount -o loop "${LFS_IMAGE}" "${LFS}"
+ok "Mounted ${LFS_IMAGE} at ${LFS}"
+
+echo ""
+df -h "${LFS}"
+echo ""
+ok "LFS build partition is ready."
+echo ""
+echo "Next steps:"
+echo "  export LFS=${LFS}"
+echo "  bash toolchain/scripts/000-env-setup.sh"
+echo ""
+echo "To remount after reboot:"
+echo "  sudo mount -o loop ${LFS_IMAGE} ${LFS}"
+echo ""
+echo "To add to /etc/fstab (auto-mount on boot):"
+echo "  ${LFS_IMAGE}  ${LFS}  ext4  loop  0  0"