rpit/write_to: quit when no proposed disk is available

README.md

@@ -1,6 +1,6 @@
 # Installation tools for APUs and Raspberry Pi boxes
 
-Supports teh following boxes used at LIN sample environment:
+Supports the following boxes used at LIN sample environment:
 
 - bare-apu: Linux box
 - controlbox: from FRM2

rpi/write_to

@@ -92,6 +92,7 @@ Example on Markus Mac:
 Please unpower the box with compute module,
 start this script again and put power immediately."""
 
+
 def write_image(kind):
     if kind == 'eemc':
         print("\nmake sure microUSB 'SLAVE' is connected to this computer")
@@ -100,34 +101,38 @@ def write_image(kind):
     else:
         pass
     proposed = find_raspi(kind)
-    if not proposed and kind == 'emmc':
-        # we may install rpiboot here if not available
-        # git clone --depth=1 https://github.com/raspberrypi/usbboot
-        # cd usbboot
-        # make
-        # ./rpiboot
+    if not proposed:
+        if kind == 'emmc':
+            # we may install rpiboot here if not available
+            # git clone --depth=1 https://github.com/raspberrypi/usbboot
+            # cd usbboot
+            # make
+            # ./rpiboot
 
-        print('not found - put rpi in bootloader mode')
-        if not rpiboot() and not rpiboot():
-            print(rescue)
-            return
-        for _ in range(10):
-            proposed = find_raspi(kind)
-            if proposed:
-                break
-            time.sleep(0.1)
-        else:
-            list_external()
-            print('can not find CM')
-            return
+            print('not found - put rpi in bootloader mode')
+            if not rpiboot() and not rpiboot():
+                print(rescue)
+                return
+            for _ in range(10):
+                proposed = find_raspi(kind)
+                if proposed:
+                    break
+                time.sleep(0.1)
+            else:
+                list_external()
+                print('can not find CM')
+                return
     list_external()
-    if len(proposed) > 1:
+    if len(proposed) == 1:
+        dev = proposed[0]
+    elif len(proposed) > 1:
         if kind == 'emmc':
             print('several potential devices for CM:', proposed)
             return
         dev = input('select device to write to {" ".join(proposed)}: ')
     else:
-        dev = proposed[0]
+        print('none of above disks seems to be the sd card')
+        return
     images = check_output(['sudo', '-u', 'zolliker', 'ssh', IMAGES_HOST, f'cd {IMAGES_DIR} ; ls {IMAGES_PAT}']).decode('latin-1').split('\n')
     for file in sorted(images):
         print(file)