fix(entry): root path should only have a single slash (+tests)

CMakeLists.txt

@@ -595,6 +595,7 @@ if(WITH_TESTS)
     test/dwarfs.cpp
     test/dwarfs_compat.cpp
     test/dwarfs_badfs.cpp
+    test/entry.cpp
     test/utils_test.cpp
     test/block_merger_test.cpp
     test/metadata_requirements_test.cpp

src/dwarfs/entry.cpp

@@ -84,7 +84,7 @@ std::string entry::path_as_string() const {
 
 std::string entry::dpath() const {
   auto p = path_as_string();
-  if (type() == E_DIR) {
+  if (type() == E_DIR && !p.empty() && p.back() != '/') {
     p += '/';
   }
   return p;
@@ -93,7 +93,7 @@ std::string entry::dpath() const {
 std::string entry::unix_dpath() const {
   auto p = name_;
 
-  if (type() == E_DIR) {
+  if (type() == E_DIR && !p.empty() && p.back() != '/') {
     p += '/';
   }
 

test/entry.cpp

@@ -0,0 +1,90 @@
+/* vim:set ts=2 sw=2 sts=2 et: */
+/**
+ * \author     Marcus Holland-Moritz ([email protected])
+ * \copyright  Copyright (c) Marcus Holland-Moritz
+ *
+ * This file is part of dwarfs.
+ *
+ * dwarfs is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * dwarfs is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with dwarfs.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <gtest/gtest.h>
+
+#include "dwarfs/entry.h"
+
+#include "test_helpers.h"
+
+using namespace dwarfs;
+
+struct entry_test : public ::testing::Test {
+  std::shared_ptr<test::os_access_mock> os;
+  std::unique_ptr<entry_factory> ef;
+
+  void SetUp() override {
+    os = test::os_access_mock::create_test_instance();
+    ef = entry_factory::create();
+  }
+
+  void TearDown() override {
+    ef.reset();
+    os.reset();
+  }
+};
+
+TEST_F(entry_test, path) {
+  auto e1 = ef->create(*os, "/");
+  auto e2 = ef->create(*os, "somelink", e1);
+  auto e3 = ef->create(*os, "somedir", e1);
+  auto e4 = ef->create(*os, "somedir/ipsum.py", e3);
+
+  EXPECT_FALSE(e1->has_parent());
+  EXPECT_TRUE(e1->is_directory());
+  EXPECT_EQ(e1->type(), entry::E_DIR);
+
+  EXPECT_EQ("/", e1->name());
+  EXPECT_EQ("/", e1->fs_path());
+  EXPECT_EQ("/", e1->path_as_string());
+  EXPECT_EQ("/", e1->dpath());
+  EXPECT_EQ("/", e1->unix_dpath());
+
+  EXPECT_TRUE(e2->has_parent());
+  EXPECT_FALSE(e2->is_directory());
+  EXPECT_EQ(e2->type(), entry::E_LINK);
+
+  EXPECT_EQ("somelink", e2->name());
+  EXPECT_EQ("/somelink", e2->fs_path());
+  EXPECT_EQ("/somelink", e2->path_as_string());
+  EXPECT_EQ("/somelink", e2->dpath());
+  EXPECT_EQ("/somelink", e2->unix_dpath());
+
+  EXPECT_TRUE(e3->has_parent());
+  EXPECT_TRUE(e3->is_directory());
+  EXPECT_EQ(e3->type(), entry::E_DIR);
+
+  EXPECT_EQ("somedir", e3->name());
+  EXPECT_EQ("/somedir", e3->fs_path());
+  EXPECT_EQ("/somedir", e3->path_as_string());
+  EXPECT_EQ("/somedir/", e3->dpath());
+  EXPECT_EQ("/somedir/", e3->unix_dpath());
+
+  EXPECT_TRUE(e4->has_parent());
+  EXPECT_FALSE(e4->is_directory());
+  EXPECT_EQ(e4->type(), entry::E_FILE);
+
+  EXPECT_EQ("ipsum.py", e4->name());
+  EXPECT_EQ("/somedir/ipsum.py", e4->fs_path());
+  EXPECT_EQ("/somedir/ipsum.py", e4->path_as_string());
+  EXPECT_EQ("/somedir/ipsum.py", e4->dpath());
+  EXPECT_EQ("/somedir/ipsum.py", e4->unix_dpath());
+}