#!/usr/bin/env bash
# Dry-run 验证 patches/ubuntu-hwe-6.17/0001 能否打在 HWE 6.17 源码树上（无需完整 debian/）。
# 完整 deb 构建仍须按 kernel-src/README.md apt source 后使用 ubuntu-hwe-617-build.sh。
set -euo pipefail
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
REPO_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
SRC="${SRC:-$REPO_ROOT/kernel-src/linux-hwe-6.17-6.17.0}"
PATCH="${PATCH:-$REPO_ROOT/patches/ubuntu-hwe-6.17/0001-ASoC-SOF-ipc3-pcm-await-DSP-reply-for-FREE-and-trigger.patch}"

if [[ ! -f "$SRC/sound/soc/sof/ipc3-pcm.c" ]]; then
  echo "ERROR: 未找到 $SRC/sound/soc/sof/ipc3-pcm.c（请设置 SRC= 或按 kernel-src/README.md 准备源码树）" >&2
  exit 1
fi
if [[ ! -f "$PATCH" ]]; then
  echo "ERROR: 补丁不存在: $PATCH" >&2
  exit 1
fi

echo "SRC=$SRC"
echo "PATCH=$PATCH"
if [[ -f "$SRC/debian/rules" ]]; then
  echo "OK: 检测到 debian/rules，可进行 fakeroot debian/rules binary-generic"
else
  echo "注意: 当前树无 debian/（常见于仅检出部分内核目录）；补丁校验仍可进行，完整包需 apt source linux-hwe-6.17"
fi

cd "$SRC"
set +e
out="$(patch -p1 --dry-run --forward < "$PATCH" 2>&1)"
st=$?
set -e
if [[ "$st" -eq 0 ]]; then
  echo "OK: patch --dry-run 通过（干净树可执行 ubuntu-hwe-617-build.sh apply）"
elif echo "$out" | grep -qiE 'previously applied|Reversed \(or previously applied\) patch detected'; then
  echo "OK: 当前 ipc3-pcm.c 已包含该补丁内容（无需重复 apply）"
else
  echo "$out" >&2
  echo "ERROR: dry-run 失败，请核对内核版本是否与补丁目标一致" >&2
  exit 1
fi