From 968328d0bb9df585145bea370c843b1efe39e2b4 Mon Sep 17 00:00:00 2001
From: Marcus Holland-Moritz <github@mhxnet.de>
Date: Thu, 28 Aug 2025 20:34:08 +0200
Subject: [PATCH] feat(filesystem_v2): add `has_valid_section_index()`

---
 include/dwarfs/reader/filesystem_v2.h |  5 +++++
 src/reader/filesystem_v2.cpp          | 11 +++++++++++
 2 files changed, 16 insertions(+)

diff --git a/include/dwarfs/reader/filesystem_v2.h b/include/dwarfs/reader/filesystem_v2.h
index 541ca2c4..891ae513 100644
--- a/include/dwarfs/reader/filesystem_v2.h
+++ b/include/dwarfs/reader/filesystem_v2.h
@@ -104,6 +104,10 @@ class filesystem_v2_lite {
 
   filesystem_version version() const { return lite_->version(); }
 
+  bool has_valid_section_index() const {
+    return lite_->has_valid_section_index();
+  }
+
   void walk(std::function<void(dir_entry_view)> const& func) const {
     lite_->walk(func);
   }
@@ -344,6 +348,7 @@ class filesystem_v2_lite {
     virtual ~impl_lite() = default;
 
     virtual filesystem_version version() const = 0;
+    virtual bool has_valid_section_index() const = 0;
     virtual void
     walk(std::function<void(dir_entry_view)> const& func) const = 0;
     virtual void
diff --git a/src/reader/filesystem_v2.cpp b/src/reader/filesystem_v2.cpp
index 2a8b3ff3..91fb7d48 100644
--- a/src/reader/filesystem_v2.cpp
+++ b/src/reader/filesystem_v2.cpp
@@ -220,6 +220,7 @@ class filesystem_ final {
   nlohmann::json metadata_as_json() const;
   std::string serialize_metadata_as_json(bool simple) const;
   filesystem_version version() const;
+  bool has_valid_section_index() const;
   void walk(std::function<void(dir_entry_view)> const& func) const;
   void walk_data_order(std::function<void(dir_entry_view)> const& func) const;
   dir_entry_view root() const;
@@ -390,6 +391,7 @@ class filesystem_ final {
   file_off_t const image_offset_;
   filesystem_options const options_;
   filesystem_version version_;
+  bool has_valid_section_index_{false};
   PERFMON_CLS_PROXY_DECL
   PERFMON_CLS_TIMER_DECL(find_path)
   PERFMON_CLS_TIMER_DECL(find_inode)
@@ -518,6 +520,7 @@ filesystem_<LoggerPolicy>::filesystem_(
 
   if (parser.has_index()) {
     LOG_DEBUG << "found valid section index";
+    has_valid_section_index_ = true;
   }
 
   header_ = parser.header();
@@ -814,6 +817,11 @@ filesystem_version filesystem_<LoggerPolicy>::version() const {
   return version_;
 }
 
+template <typename LoggerPolicy>
+bool filesystem_<LoggerPolicy>::has_valid_section_index() const {
+  return has_valid_section_index_;
+}
+
 template <typename LoggerPolicy>
 void filesystem_<LoggerPolicy>::walk(
     std::function<void(dir_entry_view)> const& func) const {
@@ -1175,6 +1183,9 @@ class filesystem_common_ : public Base {
       : fs_{lgr, os, std::move(mm), options, perfmon} {}
 
   filesystem_version version() const override { return fs_.version(); }
+  bool has_valid_section_index() const override {
+    return fs_.has_valid_section_index();
+  }
   void walk(std::function<void(dir_entry_view)> const& func) const override {
     fs_.walk(func);
   }