setup.py: Add automatic installation of nmstate C library

This commit adds functionality to the setup.py script to automatically install the nmstate C library if it's not found on the system during installation. This enhancement ensures a smoother installation process for users by handling the dependency on the nmstate C library automatically.

The script checks for the presence of the nmstate package, and if it's not found, it attempts to install the C library using the install_nmstate_lib() function. If the installation fails, an error message is printed to the console, guiding the user to install the nmstate C library separately before retrying the installation of the Python package.

Signed-off-by: jona42-ui <jonathanthembo123@gmail.com>

rust/src/python/setup.py

@@ -1,5 +1,7 @@
 # SPDX-License-Identifier: LGPL-2.1-or-later
 
+import subprocess
+import sys
 import setuptools
 
 
@@ -13,6 +15,24 @@ def requirements():
     return req
 
 
+def install_nmstate_lib():
+    try:
+        subprocess.check_call(
+            [sys.executable, "-m", "pip", "install", "nmstate"]
+        )
+    except subprocess.CalledProcessError as e:
+        print("Error installing nmstate C library:", e)
+        sys.exit(1)
+
+
+try:
+    import nmstate  # noqa: F401
+
+    print("nmstate C library found. No further action needed.")
+except ImportError:
+    print("nmstate C library not found. Attempting to install...")
+    install_nmstate_lib()
+
 setuptools.setup(
     name="nmstate",
     version="2.2.28",