feat: add util module with exists() function

docs/api/wuttamess.util.rst

@@ -0,0 +1,6 @@
+
+``wuttamess.util``
+==================
+
+.. automodule:: wuttamess.util
+   :members:

docs/index.rst

@@ -33,3 +33,4 @@ project.
    api/wuttamess.apt
    api/wuttamess.postfix
    api/wuttamess.sync
+   api/wuttamess.util

src/wuttamess/util.py

@@ -0,0 +1,32 @@
+# -*- coding: utf-8; -*-
+################################################################################
+#
+#  WuttaMess -- Fabric Automation Helpers
+#  Copyright © 2024 Lance Edgar
+#
+#  This file is part of Wutta Framework.
+#
+#  Wutta Framework 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.
+#
+#  Wutta Framework 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
+#  Wutta Framework.  If not, see <http://www.gnu.org/licenses/>.
+#
+################################################################################
+"""
+Misc. Utilities
+"""
+
+
+def exists(c, path):
+    """
+    Returns ``True`` if given path exists on the host, otherwise ``False``.
+    """
+    return not c.run(f'test -e {path}', warn=True).failed

tests/test_util.py

@@ -0,0 +1,14 @@
+# -*- coding: utf-8; -*-
+
+from unittest import TestCase
+from unittest.mock import MagicMock
+
+from wuttamess import util as mod
+
+
+class TestExists(TestCase):
+
+    def test_basic(self):
+        c = MagicMock()
+        mod.exists(c, '/foo')
+        c.run.assert_called_once_with('test -e /foo', warn=True)