#!/usr/bin/env bash
# ─────────────────────────────────────────────────────────────────────────────
# Arcline OS — write a real /etc/fstab from an edition template
#
#   scripts/apply-fstab.sh <target-root> <edition> <root-uuid> [efi-uuid]
#
# Renders editions/<edition>/fstab with the real root partition UUID, drops
# the template's swapfile line (no swap is created during deploy), and — in
# EFI installs — appends the EFI system partition mount.
# ─────────────────────────────────────────────────────────────────────────────
set -euo pipefail
source "$(dirname "${BASH_SOURCE[0]}")/common.sh"

TARGET="${1:?usage: apply-fstab.sh <target-root> <edition> <root-uuid> [efi-uuid]}"
EDITION="${2:?usage: apply-fstab.sh <target-root> <edition> <root-uuid> [efi-uuid]}"
ROOT_UUID="${3:?usage: apply-fstab.sh <target-root> <edition> <root-uuid> [efi-uuid]}"
EFI_UUID="${4:-}"

validate_edition "$EDITION"
[[ -d "$TARGET" ]] || die "target '$TARGET' does not exist"

EDIR="$(edition_dir "$EDITION")"
tmp="$(mktemp)"
trap 'rm -f "$tmp" "$tmp.clean"' EXIT

# template → real fstab; remove the swapfile line + its comment (no swap created on deploy)
sed "s/__ROOT_UUID__/$ROOT_UUID/g" "$EDIR/fstab" | grep -v -E '(swapfile|^[[:space:]]*#.*swap)' > "$tmp.clean"

if [[ -n "$EFI_UUID" ]]; then
  printf 'UUID=%s  /boot/efi  vfat  umask=0077  0  1\n' "$EFI_UUID" >> "$tmp.clean"
fi

install -Dm0644 "$tmp.clean" "$TARGET/etc/fstab"
log "wrote $TARGET/etc/fstab (root UUID $ROOT_UUID${EFI_UUID:+, efi UUID $EFI_UUID})"