From ab195cc90f95277f7f55dfbafe239f15de0f52a5 Mon Sep 17 00:00:00 2001
From: Markus Zolliker <markus.zolliker@psi.ch>
Date: Fri, 27 Jun 2025 16:02:38 +0200
Subject: [PATCH] allow predictable network interfaces

on dual-eth-raspi:
- eth0 -> end0
- eth1 -> enx...
---
 cfg/linse-rpi12.cfg                |  9 +++++++++
 install.py                         | 30 +++++++++++++++++++-----------
 sethostname.sh                     |  6 +++++-
 to_system/etc/profile.d/welcome.sh |  7 ++++++-
 utils.py                           |  2 +-
 5 files changed, 40 insertions(+), 14 deletions(-)
 create mode 100644 cfg/linse-rpi12.cfg

diff --git a/cfg/linse-rpi12.cfg b/cfg/linse-rpi12.cfg
new file mode 100644
index 0000000..36fdaaf
--- /dev/null
+++ b/cfg/linse-rpi12.cfg
@@ -0,0 +1,9 @@
+; please refer to README.md for help
+
+[BOX]
+type=dual-eth-rpi
+MAC=d8:3a:dd:51:2d:56
+
+[NETWORK]
+end0=wan
+enx00e04c680155=192.168.1.1
diff --git a/install.py b/install.py
index f99ccb8..23a51c5 100755
--- a/install.py
+++ b/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()):
diff --git a/sethostname.sh b/sethostname.sh
index 4dd7118..7bc974d 100644
--- a/sethostname.sh
+++ b/sethostname.sh
@@ -1,4 +1,8 @@
-ETHNAME=$(cat /sys/class/net/eth0/address)
+if [[ -f /sys/class/net/eth0/address ]]; then
+  ETHNAME=$(cat /sys/class/net/eth0/address)
+else
+  ETHNAME=$(cat /sys/class/net/end0/address)
+fi
 FOUND=($(grep -l -r MAC=$ETHNAME /home/l_samenv/boxtools/cfg))
 if [ -z "$FOUND" ]; then
    BOXID=${ETHNAME//:/}
diff --git a/to_system/etc/profile.d/welcome.sh b/to_system/etc/profile.d/welcome.sh
index c78468b..021c1a2 100755
--- a/to_system/etc/profile.d/welcome.sh
+++ b/to_system/etc/profile.d/welcome.sh
@@ -1,7 +1,12 @@
 export EDITOR=nano
 echo "-----------------------------------------------------"
 echo "Welcome to $HOSTNAME $(hostname -I)"
-echo "ethernet addr $(cat /sys/class/net/eth0/address)"
+if [[ -f /sys/class/net/eth0/address ]]; then
+  ETHNAME=$(cat /sys/class/net/eth0/address)
+else
+  ETHNAME=$(cat /sys/class/net/end0/address)
+fi
+echo "ethernet addr $ETHNAME"
 function service_status () {
     for name in $@; do \
       enabled=$(systemctl is-enabled ${name} 2> /dev/null) && \
diff --git a/utils.py b/utils.py
index dd08002..f3c4e96 100644
--- a/utils.py
+++ b/utils.py
@@ -95,7 +95,7 @@ class BoxInfo:
                     ifname = f'eth{int(ifname[3]) - 1}'
                 with open(ifdev) as f:
                     self.network_interfaces[ifname] = addr = f.read().strip().lower()
-                if ifname in ('eth0', 'enp1s0'):
+                if ifname in ('eth0', 'enp1s0', 'end0'):
                     macaddr = addr
                     self.main_if = ifname
         self.macaddr = macaddr