Add a sanity check that mountdir can't be equal to rootdir

src/Cli.cpp

@@ -143,6 +143,12 @@ namespace cryfs {
         }
     }
 
+    void Cli::_sanityChecks(const ProgramOptions &options) {
+        if (bf::path(options.baseDir()) == bf::path(options.mountDir())) {
+            throw std::runtime_error("Can't mount into base directory");
+        }
+    }
+
     int Cli::main(int argc, char *argv[]) {
         cpputils::showBacktraceOnSigSegv();
         _showVersion();
@@ -150,6 +156,7 @@ namespace cryfs {
         ProgramOptions options = program_options::Parser(argc, argv).parse();
 
         try {
+            _sanityChecks(options);
             _runFilesystem(options);
         } catch (const std::runtime_error &e) {
             std::cerr << "Error: " << e.what() << std::endl;

src/Cli.h

@@ -20,6 +20,7 @@ namespace cryfs {
         static bool _checkPassword(const std::string &password);
         static void _showVersion();
         static void _initLogfile(const program_options::ProgramOptions &options);
+        static void _sanityChecks(const program_options::ProgramOptions &options);
     };
 }
 

test/cli/CliTest_Setup.cpp

@@ -6,17 +6,17 @@ using cpputils::TempFile;
 using CliTest_Setup = CliTest;
 
 TEST_F(CliTest_Setup, NoSpecialOptions) {
-    EXPECT_RUN_SUCCESS({basedir.path().c_str(), mountdir.path().c_str()});
+    EXPECT_RUN_SUCCESS({basedir->path().c_str(), mountdir->path().c_str()});
 }
 
 TEST_F(CliTest_Setup, NotexistingLogfileGiven) {
     TempFile notexisting_logfile(false);
-    EXPECT_RUN_SUCCESS({basedir.path().c_str(), mountdir.path().c_str(), "--logfile", notexisting_logfile.path().c_str()});
+    EXPECT_RUN_SUCCESS({basedir->path().c_str(), mountdir->path().c_str(), "--logfile", notexisting_logfile.path().c_str()});
     //TODO Expect logfile is used (check logfile content)
 }
 
 TEST_F(CliTest_Setup, ExistingLogfileGiven) {
-    EXPECT_RUN_SUCCESS({basedir.path().c_str(), mountdir.path().c_str(), "--logfile", logfile.path().c_str()});
+    EXPECT_RUN_SUCCESS({basedir->path().c_str(), mountdir->path().c_str(), "--logfile", logfile.path().c_str()});
     //TODO Expect logfile is used (check logfile content)
 }
 

test/cli/CliTest_ShowingHelp.cpp

@@ -7,7 +7,7 @@ TEST_F(CliTest_ShowingHelp, HelpLongOption) {
 }
 
 TEST_F(CliTest_ShowingHelp, HelpLongOptionTogetherWithOtherOptions) {
-    EXPECT_EXIT_WITH_HELP_MESSAGE({"/", "/mountdir", "--help"});
+    EXPECT_EXIT_WITH_HELP_MESSAGE({basedir->path().c_str(), mountdir->path().c_str(), "--help"});
 }
 
 TEST_F(CliTest_ShowingHelp, HelpShortOption) {
@@ -15,7 +15,7 @@ TEST_F(CliTest_ShowingHelp, HelpShortOption) {
 }
 
 TEST_F(CliTest_ShowingHelp, HelpShortOptionTogetherWithOtherOptions) {
-    EXPECT_EXIT_WITH_HELP_MESSAGE({"/", "/mountdir", "-h"});
+    EXPECT_EXIT_WITH_HELP_MESSAGE({basedir->path().c_str(), mountdir->path().c_str(), "-h"});
 }
 
 TEST_F(CliTest_ShowingHelp, MissingAllOptions) {
@@ -23,5 +23,5 @@ TEST_F(CliTest_ShowingHelp, MissingAllOptions) {
 }
 
 TEST_F(CliTest_ShowingHelp, MissingDir) {
-    EXPECT_EXIT_WITH_HELP_MESSAGE({"/"});
+    EXPECT_EXIT_WITH_HELP_MESSAGE({basedir->path().c_str()});
 }

test/cli/CliTest_WrongEnvironment.cpp

@@ -5,7 +5,6 @@
 // - mountdir exists but belongs to other user
 // - mountdir exists but is missing permissions
 // - TODO when else is libfuse failing? What requirements are there for the mountdir?)
-//TODO Test what happens if basedir == mountdir
 
 
 namespace bf = boost::filesystem;
@@ -39,7 +38,7 @@ public:
     }
 
     vector<const char*> args() {
-        vector<const char*> result = {basedir.path().c_str(), mountdir.path().c_str()};
+        vector<const char*> result = {basedir->path().c_str(), mountdir->path().c_str()};
         if (GetParam().externalConfigfile) {
             result.push_back("--config");
             result.push_back(configfile.path().c_str());
@@ -69,8 +68,13 @@ TEST_P(CliTest_WrongEnvironment, NoErrorCondition) {
     Test_Run_Success();
 }
 
+TEST_P(CliTest_WrongEnvironment, MountDirIsBaseDir) {
+    mountdir = basedir;
+    Test_Run_Error("Error: Can't mount into base directory");
+}
+
 TEST_P(CliTest_WrongEnvironment, BaseDir_DoesntExist) {
-    basedir.remove();
+    basedir->remove();
     Test_Run_Error("Error: Base directory not found");
 }
 

test/cli/testutils/CliTest.h

@@ -9,10 +9,10 @@
 
 class CliTest : public ::testing::Test {
 public:
-    CliTest(): basedir(), mountdir(), logfile(), configfile(false) {}
+    CliTest(): basedir(std::make_shared<cpputils::TempDir>()), mountdir(std::make_shared<cpputils::TempDir>()), logfile(), configfile(false) {}
 
-    cpputils::TempDir basedir;
-    cpputils::TempDir mountdir;
+    std::shared_ptr<cpputils::TempDir> basedir;
+    std::shared_ptr<cpputils::TempDir> mountdir;
     cpputils::TempFile logfile;
     cpputils::TempFile configfile;