add test for link

CMakeLists.txt

@@ -75,6 +75,7 @@ if(NOT(WITHOUT_TEST))
         test-src/integration/test_readdir.cpp
         test-src/integration/test_readlink.cpp
         test-src/integration/test_symlink.cpp
+        test-src/integration/test_link.cpp
     )
 
     target_include_directories(integration_tests PRIVATE test-src/integration ${GTEST_INCLUDE_DIRS} ${GMOCK_INCLUDE_DIRS})

src/webfuse/provider.cpp

@@ -67,6 +67,9 @@ public:
             case request_type::symlink:
                 fs_symlink(reader, writer);
                 break;
+            case request_type::link:
+                fs_link(reader, writer);
+                break;
             case request_type::readdir:
                 fs_readdir(reader, writer);
                 break;
@@ -122,6 +125,15 @@ private:
         writer.write_i32(result);
     }
 
+    void fs_link(messagereader & reader, messagewriter & writer)
+    {
+        auto const from = reader.read_str();
+        auto const to = reader.read_str();
+
+        auto const result = fs_.link(from, to);
+        writer.write_i32(result);
+    }
+
     void fs_readdir(messagereader & reader, messagewriter & writer)
     {
         auto const path = reader.read_str();

test-src/integration/test_link.cpp

@@ -0,0 +1,88 @@
+#include "webfuse/webfuse.hpp"
+#include "webfuse/test/fixture.hpp"
+#include "webfuse/test/filesystem_mock.hpp"
+
+#include <gtest/gtest.h>
+
+using testing::_;
+using testing::Return;
+using testing::Invoke;
+using testing::AnyNumber;
+
+TEST(link, sucessfully_create_link)
+{
+    bool link_created = false;
+
+    webfuse::filesystem_mock fs;
+    EXPECT_CALL(fs, access("/",_)).Times(AnyNumber()).WillRepeatedly(Return(0));
+    EXPECT_CALL(fs, getattr(_,_)).WillRepeatedly(Invoke([&link_created](std::string const & path, struct stat * attr){
+        memset(reinterpret_cast<void*>(attr),0, sizeof(struct stat));
+
+        if (path == "/")
+        {
+            attr->st_nlink = 1;
+            attr->st_mode = S_IFDIR | 0755;
+            return 0;
+        }
+        else if (path == "/link-target")
+        {
+            attr->st_nlink = 1;
+            attr->st_mode = S_IFREG | 0755;
+            return 0;
+        }
+        else if ((path == "/some_link") && (link_created))
+        {
+            attr->st_nlink = 2;
+            attr->st_mode = S_IFREG | 0755;
+            return 0;
+        }
+        else
+        {
+            return -ENOENT;
+        }
+    }));
+    EXPECT_CALL(fs, link("/link-target", "/some_link")).WillOnce(Invoke([&link_created](auto const &, auto const &){
+        link_created = true;
+        return 0;
+    }));
+
+    webfuse::fixture fixture(fs);
+    auto const path = fixture.get_path() + "/some_link";
+    auto const from = fixture.get_path() + "/link-target";
+
+    ASSERT_EQ(0, ::link(from.c_str(), path.c_str()));
+}
+
+TEST(link, failed_to_create_link)
+{
+    webfuse::filesystem_mock fs;
+    EXPECT_CALL(fs, access("/",_)).Times(AnyNumber()).WillRepeatedly(Return(0));
+    EXPECT_CALL(fs, getattr(_,_)).WillRepeatedly(Invoke([](std::string const & path, struct stat * attr){
+        memset(reinterpret_cast<void*>(attr),0, sizeof(struct stat));
+
+        if (path == "/")
+        {
+            attr->st_nlink = 1;
+            attr->st_mode = S_IFDIR | 0755;
+            return 0;
+        }
+        else if (path == "/link-target")
+        {
+            attr->st_nlink = 1;
+            attr->st_mode = S_IFREG | 0755;
+            return 0;
+        }
+        else
+        {
+            return -ENOENT;
+        }
+    }));
+    EXPECT_CALL(fs, link("/link-target", "/some_link")).WillOnce(Return(-EDQUOT));
+
+    webfuse::fixture fixture(fs);
+    auto const path = fixture.get_path() + "/some_link";
+    auto const from = fixture.get_path() + "/link-target";
+
+    ASSERT_NE(0, ::link(from.c_str(), path.c_str()));
+    ASSERT_EQ(EDQUOT, errno);
+}