allow predictable network interfaces

on dual-eth-raspi:
- eth0 -> end0
- eth1 -> enx...

install.py

@@ -60,8 +60,8 @@ TEMPLATES = {}
 TEMPLATES['bare-apu'] = f"""{COMMENT}
 
 [BOX]
-type=%s
-MAC=%s
+type=%(typ)s
+MAC=%(mac)s
 
 [NETWORK]
 eth0=wan
@@ -76,8 +76,8 @@ eth3=192.168.127.254
 TEMPLATES['control-box'] = f"""{COMMENT}
 
 [BOX]
-type=%s
-MAC=%s
+type=%(typ)s
+MAC=%(mac)s
 
 [NETWORK]
 eth0=wan
@@ -94,19 +94,19 @@ line2=ADDR
 TEMPLATES['dual-eth-rpi'] = f"""{COMMENT}
 
 [BOX]
-type=%s
-MAC=%s
+type=%(typ)s
+MAC=%(mac)s
 
 [NETWORK]
-eth0=wan
-eth1=192.168.1.1
+end0=wan
+%(mac2)s=192.168.1.1
 """
 
 GENERIC_TEMPLATE = f"""{COMMENT}
 
 [BOX]
-type=%s
-MAC=%s
+type=%(typ)s
+MAC=%(mac)s
 """
 
 DHCP_HEADER = """
@@ -550,6 +550,7 @@ def handle_config():
         print('box type:', box.typ, ' mac addr:', box.macaddr)
         print('---')
     else:
+        template_args = {'mac': box.macaddr}
         if box.typ == 'apu':
             # determine if display is present
             disp = serial.Serial('/dev/ttyS1', baudrate=115200, timeout=1)
@@ -562,6 +563,11 @@ def handle_config():
         elif box.typ == 'cm4':
             box.typ = 'dual-eth-rpi'
             print('This is a cm4, so guess its a dual-eth-rpi - please check type in created cfg file')
+            template_args['mac2'] = 'enx?'
+            for addr in box.network_interfaces:
+                if addr.startswith('enx'):
+                    template_args['mac2'] = addr
+            print(template_args)
         elif box.typ == 'cm3':
             print('This is a cm3 so guess its a ionopimax - please check type in created cfg file')
             box.typ = 'ionopimax'
@@ -572,7 +578,8 @@ def handle_config():
         if template is None:
             box.typ = box.typ or 'unknown-box'
             template = GENERIC_TEMPLATE
-        template = template % (box.typ, box.macaddr)
+        template_args['typ'] = box.typ
+        template = template % template_args
 
         print('no cfg file found for this', box.typ,
               f'with mac address {box.macaddr} (hostname={box.hostname})')
@@ -740,6 +747,7 @@ else:
             doit = True
             handle_config()
             walk(Do())
+            unix_cmd(f'rm -f {TOOLS / "current"}')
             with open(TOOLS / 'current', 'w') as f:
                 f.write(result)
         elif 'more'.startswith(answer.lower()):