split system files into to_system and <boxtyp>_system

- install.py checks for both
- fix hostname

install.py

@@ -3,6 +3,7 @@
 
 - copy files from to_system into system directories
 - set host name / network settings from boxtools/cfg file
+- and many more
 """
 
 if bytes == str:
@@ -12,18 +13,39 @@ import sys
 import os
 import filecmp
 import shutil
-import serial
 import re
 import types
 import socket
 from subprocess import Popen, PIPE
 from ipaddress import IPv4Interface
 from os.path import join, getmtime, exists, basename
-from utils import BoxInfo, check_service, unix_cmd, change_firewall
 
 if os.geteuid() != 0:
     exit("You need to have root privileges to run this script.\nPlease try again, this time using 'sudo'. Exiting.")
 
+def exit():
+    print('please restart sudo ./install.py again')
+    sys.exit()
+
+try:
+    import serial
+except ImportError:
+    if 'yes'.startswith(input('install pyserial? [y]')):
+        os.system('pip3 install --break-system-packages pyserial')
+    serial = None
+
+try:
+    from utils import BoxInfo, check_service, unix_cmd, change_firewall
+except ImportError:
+    if 'yes'.startswith(input('install netifaces? [y]')):
+        os.system('pip3 install --break-system-packages netifaces')
+    serial = None
+
+if serial is None:
+    print('please restart sudo ./install.py again')
+    exit()
+
+ 
 TOOLS = BoxInfo.TOOLS
 
 more_info = False
@@ -108,10 +130,10 @@ pip_requirements = {
 
 
 box = BoxInfo()
+box.hostname_changed = False
 dhcp_server_cfg = []
 
-TO_SYSTEM = f'{TOOLS}/{box.typ}_system'
+TO_SYSTEM = [f'{TOOLS}/to_system', f'{TOOLS}/{box.typ}_system']
-os.chdir(TO_SYSTEM)
 
 
 def do_cmd(command):
@@ -151,7 +173,7 @@ def router(firewall=False, **opts):
     if not opts:
         return None
     try:
-        os.remove(join(TO_SYSTEM, 'etc/nftables.conf'))
+        os.remove(join(TO_SYSTEM[0], 'etc/nftables.conf'))
         with open(f'{TOOLS}/requirements.txt') as f:
             pip_requirements['root']['tools'] = f.read()
     except FileNotFoundError:
@@ -333,6 +355,8 @@ def create_if(name, cfg):
 
 
 def walk(action):
+    for rootpath in TO_SYSTEM:
+        os.chdir(rootpath)
         for dirpath, _, files in os.walk('.'):
             syspath = dirpath[1:]  # remove leading '.'
             action.dirpath = dirpath
@@ -449,11 +473,13 @@ def handle_config():
         cfgfile = BoxInfo.CFGPATH % (newhostname, box.id)
         with open(cfgfile, 'w') as f:
             f.write(template)
-    if cfgfile != BoxInfo.CFGPATH % (newhostname, box.id):
+    if box.hostname_changed or cfgfile != BoxInfo.CFGPATH % (newhostname, box.id):
+        box.hostname_changed = True
         if cfgfile:
             newhostname = basename(cfgfile).rpartition('_')[0]
         if doit:
-            os.system('sh sethostname.sh')
+            print('bash sethostname.sh')
+            os.system(f'bash {TOOLS}/sethostname.sh')
         else:
             if cfgfile:
                 print('replace host name %r by %r' % (box.hostname, newhostname))
@@ -497,8 +523,13 @@ def handle_config():
                 print('change dhcpd.conf')
                 to_start['isc-dhcp-server'] = 'restart'
                 show.dirty = True
+            try:
                 replace_in_file('/etc/default/isc-dhcp-server',
                                 r'INTERFACESv4="(.*)"', ' '.join([n for n in box.macaddr if n != box.main_if]))
+            except FileNotFoundError:
+                if 'yes'.startswith(input('install isc-dhcp-server? [y]')):
+                    os.system('apt-get install isc-dhcp-server')
+                exit()
         elif doit:
             check_service('isc-dhcp-server', False)
         content = []