vasilito
9b6ea8119f
fat_tool.py provides zero-dependency FAT32 manipulation (ls, mkdir, cp-in, cp-out) using only Python stdlib struct/os. install-grub.sh uses it to extract the existing Redox bootloader from ESP, install GRUB as the primary boot manager, and set up the chainload configuration.
122 lines
3.6 KiB
Bash
Executable File
122 lines
3.6 KiB
Bash
Executable File
#!/bin/bash
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# install-grub.sh — Install GRUB bootloader into a Red Bear OS disk image
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#
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# Boot sequence after installation:
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# UEFI firmware → GRUB (menu) → chainload Redox bootloader → kernel → Red Bear OS
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#
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# Usage:
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# ./local/scripts/install-grub.sh <harddrive.img>
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# ./local/scripts/install-grub.sh build/x86_64/harddrive.img
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#
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# Prerequisites:
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# - GRUB recipe built: make r.grub
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# - ESP partition >= 8 MiB (set efi_partition_size = 16 in config)
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# - Python 3 (for fat_tool.py — no mtools needed)
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set -euo pipefail
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IMAGE="${1:?Usage: $0 <harddrive.img>}"
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SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
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REPO_ROOT="$(cd "${SCRIPT_DIR}/../.." && pwd)"
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ESP_LBA=2048
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ESP_SECTOR_SIZE=512
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ESP_OFFSET=$((ESP_LBA * ESP_SECTOR_SIZE))
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FAT_TOOL="${SCRIPT_DIR}/fat_tool.py"
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ESP="${IMAGE}@${ESP_OFFSET}"
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if [ ! -f "${IMAGE}" ]; then
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echo "ERROR: Image file not found: ${IMAGE}" >&2
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exit 1
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fi
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if ! command -v python3 &>/dev/null; then
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echo "ERROR: python3 not found" >&2
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exit 1
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fi
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GRUB_EFI=""
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GRUB_CFG=""
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# Search in recipe stage directory (cookbook stores output here)
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for f in $(find "${REPO_ROOT}/local/recipes/core/grub/target" -path "*/stage/usr/lib/boot/grub.efi" 2>/dev/null); do
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GRUB_EFI="${f}"
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break
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done
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for f in $(find "${REPO_ROOT}/local/recipes/core/grub/target" -path "*/stage/usr/lib/boot/grub.cfg" 2>/dev/null); do
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GRUB_CFG="${f}"
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break
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done
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# Fallback: search repo extracted packages
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if [ -z "${GRUB_EFI}" ]; then
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for f in $(find "${REPO_ROOT}/repo" -path "*/grub/*/usr/lib/boot/grub.efi" 2>/dev/null); do
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GRUB_EFI="${f}"
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break
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done
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fi
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if [ -z "${GRUB_CFG}" ]; then
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for f in $(find "${REPO_ROOT}/repo" -path "*/grub/*/usr/lib/boot/grub.cfg" 2>/dev/null); do
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GRUB_CFG="${f}"
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break
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done
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fi
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if [ -z "${GRUB_CFG}" ] && [ -f "${REPO_ROOT}/local/recipes/core/grub/grub.cfg" ]; then
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GRUB_CFG="${REPO_ROOT}/local/recipes/core/grub/grub.cfg"
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fi
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if [ -z "${GRUB_EFI}" ]; then
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echo "ERROR: Cannot find grub.efi in recipe output." >&2
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echo "Build GRUB first: make r.grub" >&2
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exit 1
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fi
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if [ -z "${GRUB_CFG}" ]; then
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echo "ERROR: Cannot find grub.cfg" >&2
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exit 1
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fi
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echo "GRUB Installation"
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echo " Image: ${IMAGE}"
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echo " ESP: offset ${ESP_OFFSET} bytes (LBA ${ESP_LBA})"
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echo " GRUB EFI: ${GRUB_EFI}"
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echo " GRUB CFG: ${GRUB_CFG}"
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echo ""
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echo "Current ESP contents:"
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python3 "${FAT_TOOL}" ls "${IMAGE}" "${ESP_OFFSET}" /
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echo ""
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REDBEAR_TMP=$(mktemp)
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trap 'rm -f "${REDBEAR_TMP}"' EXIT
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echo "Extracting Redox bootloader from ESP..."
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python3 "${FAT_TOOL}" cp-out "${IMAGE}" "${ESP_OFFSET}" "EFI/BOOT/BOOTX64.EFI" "${REDBEAR_TMP}"
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REDBEAR_SIZE=$(stat -c%s "${REDBEAR_TMP}")
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echo " Redox bootloader: ${REDBEAR_SIZE} bytes"
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echo "Creating EFI/REDBEAR directory..."
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python3 "${FAT_TOOL}" mkdir "${IMAGE}" "${ESP_OFFSET}" "EFI/REDBEAR" 2>/dev/null || true
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echo "Installing Redox bootloader to EFI/REDBEAR/redbear.efi..."
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python3 "${FAT_TOOL}" cp-in "${IMAGE}" "${ESP_OFFSET}" "${REDBEAR_TMP}" "EFI/REDBEAR/redbear.efi"
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GRUB_SIZE=$(stat -c%s "${GRUB_EFI}")
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echo "Installing GRUB (${GRUB_SIZE} bytes) as EFI/BOOT/BOOTX64.EFI..."
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python3 "${FAT_TOOL}" cp-in "${IMAGE}" "${ESP_OFFSET}" "${GRUB_EFI}" "EFI/BOOT/BOOTX64.EFI"
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echo "Installing grub.cfg to EFI/BOOT/grub.cfg..."
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python3 "${FAT_TOOL}" cp-in "${IMAGE}" "${ESP_OFFSET}" "${GRUB_CFG}" "EFI/BOOT/grub.cfg"
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echo ""
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echo "Final ESP contents:"
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python3 "${FAT_TOOL}" ls "${IMAGE}" "${ESP_OFFSET}" /
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echo ""
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echo "Installation complete. Boot sequence: UEFI -> GRUB (5s timeout) -> Redox bootloader -> kernel"
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echo "Test with: make qemu"
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echo "Revert: make all CONFIG_NAME=<your-config> (rebuild without GRUB)"
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