Better is_raspberrypi

openflexure_microscope/api/v2/blueprints/actions/system.py

@@ -1,15 +1,49 @@
 from openflexure_microscope.api.views import MicroscopeView
 
 import subprocess
-import os
+import io
 from sys import platform
 
 
-def is_raspberrypi():
-    if (platform != "linux"):
-        return False
-    else:
-        return (os.uname()[1] == 'raspberrypi')
+def is_raspberrypi(raise_on_errors=False):
+    """
+    Checks if Raspberry Pi.
+    """
+    try:
+        with io.open('/proc/cpuinfo', 'r') as cpuinfo:
+            found = False
+            for line in cpuinfo:
+                if line.startswith('Hardware'):
+                    found = True
+                    label, value = line.strip().split(':', 1)
+                    value = value.strip()
+                    if value not in (
+                        'BCM2708',
+                        'BCM2709',
+                        'BCM2835',
+                        'BCM2836'
+                    ):
+                        if raise_on_errors:
+                            raise ValueError(
+                                'This system does not appear to be a '
+                                'Raspberry Pi.'
+                            )
+                        else:
+                            return False
+            if not found:
+                if raise_on_errors:
+                    raise ValueError(
+                        'Unable to determine if this system is a Raspberry Pi.'
+                    )
+                else:
+                    return False
+    except IOError:
+        if raise_on_errors:
+            raise ValueError('Unable to open `/proc/cpuinfo`.')
+        else:
+            return False
+
+    return True
 
 class ShutdownAPI(MicroscopeView):
     """