Move system file install into setup.py

The installation of system files has been moved into the 'install' command
instead of running unconditionally.  This makes it possible to create a source code
distribution of that doesn't immediately clobber the build machine's system files.
This will also allow the image build to be simplified as it will only need to copy the
sdist archive instead of multiple directories worth of files.

Signed-off-by: llamasoft <llamasoft@rm-rf.email>

MANIFEST.in

@@ -1,9 +1,10 @@
 exclude *.pyc .DS_Store .gitignore MANIFEST.in
+include requirements.txt
 include setup.py
-include distribute_setup.py
 include README.md
 include LICENSE
 recursive-include bin *
+recursive-include builder/data *
 recursive-include pwnagotchi *.py
 recursive-include pwnagotchi *.yml
 recursive-include pwnagotchi *.*

setup.py

@@ -1,29 +1,31 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 from setuptools import setup, find_packages
-from distutils.util import strtobool
-import os
+from setuptools.command.install import install
 import glob
-import shutil
+import logging
+import os
 import re
+import shutil
+import warnings
 
+log = logging.getLogger(__name__)
 
 def install_file(source_filename, dest_filename):
     # do not overwrite network configuration if it exists already
     # https://github.com/evilsocket/pwnagotchi/issues/483
     if dest_filename.startswith('/etc/network/interfaces.d/') and os.path.exists(dest_filename):
-        print("%s exists, skipping ..." % dest_filename)
+        log.info(f"{dest_filename} exists, skipping ...")
         return
 
-    print("installing %s to %s ..." % (source_filename, dest_filename))
-    try:
-        dest_folder = os.path.dirname(dest_filename)
-        if not os.path.isdir(dest_folder):
-            os.makedirs(dest_folder)
+    log.info(f"installing {source_filename} to {dest_filename} ...")
+    dest_folder = os.path.dirname(dest_filename)
+    if not os.path.isdir(dest_folder):
+        os.makedirs(dest_folder)
 
-        shutil.copyfile(source_filename, dest_filename)
-    except Exception as e:
-        print("error installing %s: %s" % (source_filename, e))
+    shutil.copyfile(source_filename, dest_filename)
+    if dest_filename.startswith("/usr/bin/"):
+        os.chmod(dest_filename, 0o755)
 
 
 def install_system_files():
@@ -35,15 +37,27 @@ def install_system_files():
             dest_filename = source_filename.replace(data_path, '')
             install_file(source_filename, dest_filename)
 
+
+def restart_services():
     # reload systemd units
     os.system("systemctl daemon-reload")
 
-
-def installer():
-    install_system_files()
     # for people updating https://github.com/evilsocket/pwnagotchi/pull/551/files
     os.system("systemctl enable fstrim.timer")
 
+
+class CustomInstall(install):
+    def run(self):
+        super().run()
+        if os.geteuid() != 0:
+            warnings.warn(
+                "Not running as root, can't install pwnagotchi system files!"
+            )
+            return
+        install_system_files()
+        restart_services()
+
+
 def version(version_file):
     with open(version_file, 'rt') as vf:
         version_file_content = vf.read()
@@ -54,10 +68,6 @@ def version(version_file):
 
     return None
 
-
-if strtobool(os.environ.get("PWNAGOTCHI_ENABLE_INSTALLER", "1")):
-    installer()
-
 with open('requirements.txt') as fp:
     required = [line.strip() for line in fp if line.strip() != ""]
 
@@ -72,6 +82,9 @@ def version(version_file):
       url='https://pwnagotchi.ai/',
       license='GPL',
       install_requires=required,
+      cmdclass={
+          "install": CustomInstall,
+      },
       scripts=['bin/pwnagotchi'],
       package_data={'pwnagotchi': ['defaults.yml', 'pwnagotchi/defaults.yml', 'locale/*/LC_MESSAGES/*.mo']},
       include_package_data=True,