223 lines
6.9 KiB
Bash
223 lines
6.9 KiB
Bash
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#!/usr/bin/env bash
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#
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# Pack SYSTEM/ into a GPT disk:
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# p1 FAT32 ESP (EF00) /EFI /limine /boot /driver /system
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# Limine 10 cannot read ext4; every boot(): module must live here.
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# p2 ext4 (8300) the rest of SYSTEM/ (and a copy of driver/system)
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#
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# Usage:
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# sudo bash CODE/linux/pack_system_image.sh <SYSTEM_DIR> <OUTPUT_IMG>
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#
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# FAT32 still cannot hold a single file >= 4GiB. Keep linux-extra-rootfs.img
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# under that limit while it lives in SYSTEM/boot.
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set -Eeuo pipefail
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if [[ $# -ne 2 ]]; then
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echo "Usage: $0 <SYSTEM_DIR> <OUTPUT_IMG>" >&2
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exit 2
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fi
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SYSTEM="$(cd "$1" && pwd)"
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OUT="$2"
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OUT_DIR="$(cd "$(dirname "$OUT")" && pwd)"
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OUT="$OUT_DIR/$(basename "$OUT")"
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# Must match SYSTEM/limine/limine.conf uuid(...) paths.
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EXT4_UUID="64657368-6162-4000-8000-000000000002"
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DISK_GUID="64657368-6162-4000-8000-000000000001"
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ESP_PARTGUID="64657368-6162-4000-8000-0000000000b1"
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EXT4_PARTGUID="64657368-6162-4000-8000-0000000000e2"
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for tool in sfdisk mkfs.vfat mkfs.ext4 rsync losetup du; do
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if ! command -v "$tool" >/dev/null 2>&1; then
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echo "[pack] ERROR: missing tool: $tool" >&2
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exit 2
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fi
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done
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if [[ ! -d "$SYSTEM/boot" || ! -d "$SYSTEM/EFI" || ! -f "$SYSTEM/limine/limine.conf" ]]; then
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echo "[pack] ERROR: SYSTEM/ must contain boot/, EFI/, and limine/limine.conf" >&2
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exit 2
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fi
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bytes_of() {
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local p="$1"
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if [[ -e "$p" ]]; then
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du -sb --apparent-size "$p" | awk '{print $1}'
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else
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echo 0
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fi
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}
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align_up() {
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local val="$1"
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local align="$2"
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echo $(( (val + align - 1) / align * align ))
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}
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# Sum each SYSTEM child so 9p/du-on-parent cannot drop boot/.
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boot_bytes="$(bytes_of "$SYSTEM/boot")"
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efi_bytes="$(bytes_of "$SYSTEM/EFI")"
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limine_bytes="$(bytes_of "$SYSTEM/limine")"
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driver_bytes="$(bytes_of "$SYSTEM/driver")"
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sys_bytes="$(bytes_of "$SYSTEM/system")"
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esp_content=$((boot_bytes + efi_bytes + limine_bytes + driver_bytes + sys_bytes))
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rest_bytes=0
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shopt -s dotglob nullglob
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for child in "$SYSTEM"/*; do
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name="$(basename "$child")"
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case "$name" in
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boot|EFI|limine) continue ;;
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esac
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rest_bytes=$((rest_bytes + $(bytes_of "$child")))
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done
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shopt -u dotglob nullglob
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# FAT32/ext4 metadata slack: 15% + 64MiB, 1MiB aligned.
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esp_need=$((esp_content + esp_content / 7 + 64 * 1024 * 1024))
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ext4_need=$((rest_bytes + rest_bytes / 7 + 64 * 1024 * 1024))
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[[ "$esp_need" -lt $((256 * 1024 * 1024)) ]] && esp_need=$((256 * 1024 * 1024))
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# User-facing data partition: keep at least 2GiB even when SYSTEM/ is small.
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[[ "$ext4_need" -lt $((2048 * 1024 * 1024)) ]] && ext4_need=$((2048 * 1024 * 1024))
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MIB=$((1024 * 1024))
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SECTOR=512
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esp_bytes="$(align_up "$esp_need" "$MIB")"
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ext4_bytes="$(align_up "$ext4_need" "$MIB")"
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esp_sectors=$((esp_bytes / SECTOR))
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ext4_sectors=$((ext4_bytes / SECTOR))
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# 1MiB protective gap + backup GPT
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gpt_front=2048
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gpt_back=2048
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total_sectors=$((gpt_front + esp_sectors + ext4_sectors + gpt_back))
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total_bytes=$((total_sectors * SECTOR))
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extra_bytes="$(bytes_of "$SYSTEM/boot/linux-extra-rootfs.img")"
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echo "[pack] GPT dual partition (NOT a single FAT32 disk):"
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echo "[pack] p1 FAT32 ESP = Limine + /boot modules (Limine 10 cannot read ext4)"
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echo "[pack] p2 ext4 = rest of SYSTEM/ uuid=$EXT4_UUID"
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echo "[pack] SYSTEM=$SYSTEM"
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echo "[pack] ESP content=$((esp_content / 1024 / 1024)) MB partition=$((esp_bytes / 1024 / 1024)) MB"
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echo "[pack] linux-extra-rootfs.img=$((extra_bytes / 1024 / 1024)) MB (must stay on p1 FAT32)"
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echo "[pack] ext4 content=$((rest_bytes / 1024 / 1024)) MB partition=$((ext4_bytes / 1024 / 1024)) MB"
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echo "[pack] disk=$((total_bytes / 1024 / 1024)) MB -> $OUT"
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WORK="$(mktemp -d /var/tmp/deshab_pack.XXXXXX)"
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IMG="$WORK/disk.img"
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MNT_ESP="$WORK/mnt_esp"
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MNT_EXT="$WORK/mnt_ext"
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LOOP=""
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cleanup() {
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set +e
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if [[ -n "${MNT_ESP:-}" ]]; then
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umount "$MNT_ESP" 2>/dev/null
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fi
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if [[ -n "${MNT_EXT:-}" ]]; then
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umount "$MNT_EXT" 2>/dev/null
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fi
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if [[ -n "${LOOP:-}" ]]; then
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losetup -d "$LOOP" 2>/dev/null
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fi
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rm -rf "$WORK"
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}
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trap cleanup EXIT
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mkdir -p "$MNT_ESP" "$MNT_EXT"
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# Prefer a sparse image so the 9p copy back to Windows is smaller when possible.
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truncate -s "$total_bytes" "$IMG"
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esp_start="$gpt_front"
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ext4_start=$((esp_start + esp_sectors))
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sfdisk --no-reread "$IMG" <<EOF
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label: gpt
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label-id: ${DISK_GUID}
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first-lba: ${gpt_front}
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sector-size: 512
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start=${esp_start}, size=${esp_sectors}, type=C12A7328-F81F-11D2-BA4B-00A0C93EC93B, uuid=${ESP_PARTGUID}, name=DESHABBOOT
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start=${ext4_start}, size=${ext4_sectors}, type=0FC63DAF-8483-4772-8E79-3D69D8477DE4, uuid=${EXT4_PARTGUID}, name=DESHAB
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EOF
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LOOP="$(losetup --find --show --partscan "$IMG")"
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echo "[pack] loop=$LOOP"
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echo "[pack] partition table:"
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sfdisk -l "$IMG" || true
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p1=""
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p2=""
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for _ in $(seq 1 25); do
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if [[ -b "${LOOP}p1" && -b "${LOOP}p2" ]]; then
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p1="${LOOP}p1"
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p2="${LOOP}p2"
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break
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fi
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# Some kernels expose /dev/loopXp1 only after partx.
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if command -v partx >/dev/null 2>&1; then
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partx --update "$LOOP" 2>/dev/null || true
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fi
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sleep 0.2
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done
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if [[ -z "$p1" || -z "$p2" ]]; then
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echo "[pack] ERROR: loop partitions did not appear under $LOOP" >&2
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ls -l "$LOOP"* 2>/dev/null || true
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exit 1
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fi
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# 4KiB clusters on a ~5GiB ESP; 32KiB if the ESP is 4GiB or larger.
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fat_cluster_sectors=8
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if [[ "$esp_bytes" -ge $((4096 * 1024 * 1024)) ]]; then
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fat_cluster_sectors=64
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fi
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mkfs.vfat -F 32 -n DESHABBOOT -s "$fat_cluster_sectors" "$p1" >/dev/null
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mkfs.ext4 -F -q -L DESHAB -U "$EXT4_UUID" -m 1 "$p2"
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echo "[pack] filesystems:"
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blkid "$p1" "$p2" || true
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mount "$p1" "$MNT_ESP"
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mount "$p2" "$MNT_EXT"
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mkdir -p "$MNT_ESP/EFI" "$MNT_ESP/limine" "$MNT_ESP/boot" "$MNT_ESP/driver" "$MNT_ESP/system"
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echo "[pack] copying p1 FAT32 ESP (EFI/ limine/ boot/ driver/ system/)"
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# vfat has no Unix owners/perms; -a would fail with rsync code 23.
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rsync -rltD --info=progress2 "$SYSTEM/EFI/" "$MNT_ESP/EFI/"
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rsync -rltD --info=progress2 "$SYSTEM/limine/" "$MNT_ESP/limine/"
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cp -f "$SYSTEM/limine/limine.conf" "$MNT_ESP/limine.conf"
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rsync -rltD --info=progress2 "$SYSTEM/boot/" "$MNT_ESP/boot/"
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rsync -rltD --info=progress2 "$SYSTEM/driver/" "$MNT_ESP/driver/"
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rsync -rltD --info=progress2 "$SYSTEM/system/" "$MNT_ESP/system/"
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if [[ -d "$SYSTEM/user" ]]; then
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echo "[pack] copying user/ onto FAT32 ESP for native desktop icons"
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rsync -rltD --info=progress2 "$SYSTEM/user/" "$MNT_ESP/user/"
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fi
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echo "[pack] copying p2 ext4 data partition"
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shopt -s dotglob nullglob
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for child in "$SYSTEM"/*; do
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name="$(basename "$child")"
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case "$name" in
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boot|EFI|limine) continue ;;
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esac
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rsync -a --info=progress2 "$child" "$MNT_EXT/"
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done
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shopt -u dotglob nullglob
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sync
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umount "$MNT_ESP"
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umount "$MNT_EXT"
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losetup -d "$LOOP"
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LOOP=""
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echo "[pack] writing $OUT"
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mkdir -p "$OUT_DIR"
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# Sparse copy keeps the Windows-side file smaller when the host supports it.
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cp --sparse=always "$IMG" "$OUT"
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sync
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echo "[pack] done: $OUT"
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echo "[pack] GPT p1 FAT32 ESP (Limine/boot) + p2 ext4 uuid=$EXT4_UUID"
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