OsOperations::get_tempdir() is added (#254)

Signature:
 def get_tempdir(self) -> str

Author: dmitry-lipetsk

testgres/operations/local_ops.py

@@ -528,3 +528,10 @@ def is_port_free(self, number: int) -> bool:
                 return True
             except OSError:
                 return False
+
+    def get_tempdir(self) -> str:
+        r = tempfile.gettempdir()
+        assert r is not None
+        assert type(r) == str  # noqa: E721
+        assert os.path.exists(r)
+        return r

testgres/operations/os_ops.py

@@ -130,3 +130,6 @@ def get_process_children(self, pid):
     def is_port_free(self, number: int):
         assert type(number) == int  # noqa: E721
         raise NotImplementedError()
+
+    def get_tempdir(self) -> str:
+        raise NotImplementedError()

testgres/operations/remote_ops.py

@@ -659,6 +659,34 @@ def is_port_free(self, number: int) -> bool:
             out=output
         )
 
+    def get_tempdir(self) -> str:
+        command = ["mktemp", "-u", "-d"]
+
+        exec_exitcode, exec_output, exec_error = self.exec_command(
+            command,
+            verbose=True,
+            encoding=get_default_encoding(),
+            ignore_errors=True
+        )
+
+        assert type(exec_exitcode) == int  # noqa: E721
+        assert type(exec_output) == str  # noqa: E721
+        assert type(exec_error) == str  # noqa: E721
+
+        if exec_exitcode != 0:
+            RaiseError.CommandExecutionError(
+                cmd=command,
+                exit_code=exec_exitcode,
+                message="Could not detect a temporary directory.",
+                error=exec_error,
+                out=exec_output)
+
+        temp_subdir = exec_output.strip()
+        assert type(temp_subdir) == str  # noqa: E721
+        temp_dir = os.path.dirname(temp_subdir)
+        assert type(temp_dir) == str  # noqa: E721
+        return temp_dir
+
     @staticmethod
     def _is_port_free__process_0(error: str) -> bool:
         assert type(error) == str  # noqa: E721

tests/test_os_ops_common.py

@@ -817,6 +817,39 @@ def LOCAL_server(s: socket.socket):
         if ok_count == 0:
             raise RuntimeError("No one free port was found.")
 
+    def test_get_tmpdir(self, os_ops: OsOperations):
+        assert isinstance(os_ops, OsOperations)
+
+        dir = os_ops.get_tempdir()
+        assert type(dir) == str  # noqa: E721
+        assert os_ops.path_exists(dir)
+        assert os.path.exists(dir)
+
+        file_path = os.path.join(dir, "testgres--" + uuid.uuid4().hex + ".tmp")
+
+        os_ops.write(file_path, "1234", binary=False)
+
+        assert os_ops.path_exists(file_path)
+        assert os.path.exists(file_path)
+
+        d = os_ops.read(file_path, binary=False)
+
+        assert d == "1234"
+
+        os_ops.remove_file(file_path)
+
+        assert not os_ops.path_exists(file_path)
+        assert not os.path.exists(file_path)
+
+    def test_get_tmpdir__compare_with_py_info(self, os_ops: OsOperations):
+        assert isinstance(os_ops, OsOperations)
+
+        actual_dir = os_ops.get_tempdir()
+        assert actual_dir is not None
+        assert type(actual_dir) == str  # noqa: E721
+        expected_dir = str(tempfile.tempdir)
+        assert actual_dir == expected_dir
+
     class tagData_OS_OPS__NUMS:
         os_ops_descr: OsOpsDescr
         nums: int