forge: step 1 — bootstrap wrapper workflow

scripts/export-patches.sh

@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+source "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/meshcore-env.sh"
+
+base_ref="${1:-origin/main}"
+
+if [ ! -d "${MESHCORE_DIR}/.git" ] && [ ! -f "${MESHCORE_DIR}/.git" ]; then
+  echo "MeshCore submodule is missing at ${MESHCORE_DIR}" >&2
+  echo "Run: git submodule update --init --recursive" >&2
+  exit 1
+fi
+
+if ! git -C "${MESHCORE_DIR}" rev-parse --verify "${base_ref}" >/dev/null 2>&1; then
+  echo "Base ref '${base_ref}' is not available in the MeshCore submodule." >&2
+  exit 1
+fi
+
+if [ -n "$(git -C "${MESHCORE_DIR}" status --porcelain)" ]; then
+  echo "MeshCore submodule has uncommitted or untracked changes; commit them in the submodule before exporting patches." >&2
+  exit 1
+fi
+
+commit_count="$(git -C "${MESHCORE_DIR}" rev-list --count "${base_ref}..HEAD")"
+if [ "${commit_count}" -eq 0 ]; then
+  echo "No MeshCore commits to export after ${base_ref}."
+  exit 1
+fi
+
+mkdir -p "${PATCH_DIR}"
+rm -f "${PATCH_DIR}"/*.patch
+git -C "${MESHCORE_DIR}" format-patch --zero-commit --no-signature --output-directory "${PATCH_DIR}" "${base_ref}..HEAD" >/dev/null
+
+echo "Exported ${commit_count} MeshCore patch(es) to ${PATCH_DIR#${MESHCORE_FW_ROOT}/}"