Add auto config of wifi using a usb disk with 'wifi.txt' config file

docs/README.md

@@ -14,6 +14,7 @@ Items marked ```REQUIRED``` are assumed to be setup and working. You've been war
 * [Finalize Setup (REQUIRED)](finalize_setup.md)
 * [Setup swap (REQUIRED)](swap.md)
 * [Additional Networking Setup (REQUIRED)](networking.md)
+* [Automatic WiFi Setup (VERY SMART)](auto_wifi_setup.md)
 * [Apt use RAM (VERY SMART FOR 4Gb RAM)](apt_cache_tmpfs.md)
 * [Automatic Updates (VERY SMART)](auto_updates.md)
 * [Logs in RAM (VERY SMART)](log2ram.md)

docs/auto_wifi_setup.md

@@ -0,0 +1,29 @@
+# Automatic WiFi Config
+
+The below will setup automatic WiFi configuration via text file. The way this will work is you plug in a USB disk with a file named ```wifi.txt``` with the ```essid``` as the first line and ```password``` as the second line in the file. On boot a small script will run that reads the file and re-configures the PiFrame's WiFi to use the new values.
+
+Can be used for setup and/or re-configuring WiFi if something changes.
+
+``` sh
+
+git clone https://git.kemonine.info/PiFrame/piframe.git /opt/piframe
+cp /opt/piframe/wifi_setup.py /usr/local/bin
+chmod a+x /usr/local/bin/wifi_setup.py
+
+cat > /etc/systemd/system/wifi_setup.service <<EOF
+[Unit]
+Description=Automatic configuration of WiFi on boot
+
+[Service]
+User=root
+PrivateTmp=true
+ExecStart=/usr/local/bin/wifi_setup.py
+
+[Install]
+WantedBy=multi-user.target
+EOF
+
+systemctl daemon-reload
+systemctl enable --now wifi_setup
+
+```

docs/networking.md

@@ -26,7 +26,7 @@ systemctl enable --now firewalld
 # Setup Ethernet
 # Setup by the above netplan tweaks
 
-# Setup Wifi (optional)
+# Setup Wifi via CLI (optional)
 nmtui
 
 ```

wifi_setup.py

@@ -0,0 +1,56 @@
+#!/usr/bin/python3
+# -*- coding: utf-8 -*-
+
+import os
+import subprocess
+
+# Make sure mount point exists
+if not os.path.isdir('/var/wifi'):
+    os.mkdir('/var/wifi')
+
+# Scan unmounted disks/partitions to see if we need to reconfig wifi
+blkids = subprocess.run(['/usr/sbin/blkid', '-o', 'device'], stdout=subprocess.PIPE, stderr=subprocess.PIPE, universal_newlines=True)
+for blkid in blkids.stdout.split('\n'):
+    blkid = blkid.strip()
+    if not blkid:
+        continue
+    # Verify the disk/partition isn't mounted
+    findmnt = subprocess.run(['/usr/bin/findmnt', '-n', '-o', 'TARGET', blkid], stdout=subprocess.PIPE, stderr=subprocess.PIPE, universal_newlines=True)
+    mnt = findmnt.stdout.strip()
+    if not mnt and not 'zram' in blkid:
+        print('checking ' + blkid)
+        try:
+            # Mount the disk
+            subprocess.run(['/usr/bin/mount', blkid, '/var/wifi/'], universal_newlines=True)
+            # Check if the wifi.txt confg file is present (line 1 is essid, line 2 is PSK)
+            if os.path.exists('/var/wifi/wifi.txt'):
+                # Get wifi config
+                essid = ''
+                password = ''
+                with open('/var/wifi/wifi.txt', 'r') as f:
+                    essid = f.readline().strip()
+                    password = f.readline().strip()
+                if essid and password:
+                    print('Found wifi config (' + essid + ' / ' + password + ')')
+                    # Look for existing wifi connections that should be cleaned up
+                    nmcli = subprocess.run(['/usr/bin/nmcli', '-t', 'connection', 'show'], stdout=subprocess.PIPE, stderr=subprocess.PIPE, universal_newlines=True)
+                    for connection in nmcli.stdout.split('\n'):
+                        # Ignore empty lines in output
+                        if not connection:
+                            continue
+                        connection_details = connection.split(':')
+                        if connection_details[2] == '802-11-wireless':
+                            # If we cannot clean up a wifi connection assume it's a non-issue
+                            try:
+                                # Cleanup existing wifi connection
+                                print('cleaning up wifi connection ' + connection_details[0])
+                                subprocess.run(['/usr/bin/nmcli', 'connection', 'del', connection_details[1]], universal_newlines=True)
+                            except:
+                                pass
+                    print('Connecting to ' + essid + ' with password ' + password)
+                    subprocess.run(['/usr/bin/nmcli', 'd', 'wifi', 'connect', essid, 'password', password], universal_newlines=True)
+            # Unmount disk so it's safe to remove
+            subprocess.run(['/usr/bin/umount', '/var/wifi/'], universal_newlines=True)
+        except:
+            # Unmount disk so it's safe to remove
+            subprocess.run(['/usr/bin/umount', '/var/wifi/'], universal_newlines=True)