revert default backend to linux_kernel

brother_ql/backends/helpers.py

@@ -14,10 +14,10 @@
 
 logger = logging.getLogger(__name__)
 
-def discover(backend_identifier="pyusb"):
+def discover(backend_identifier="linux_kernel"):
     if backend_identifier is None:
-        logger.info("Backend for discovery not specified, defaulting to pyusb")
-        backend_identifier = "pyusb"
+        logger.info("Backend for discovery not specified, defaulting to linux_kernel.")
+        backend_identifier = "linux_kernel"
     be = backend_factory(backend_identifier)
     list_available_devices = be['list_available_devices']
     BrotherQLBackend       = be['backend_class']
@@ -48,8 +48,8 @@ def send(instructions, printer_identifier=None, backend_identifier=None, blockin
         try:
             selected_backend = guess_backend(printer_identifier)
         except:
-            logger.info("No backend stated. Selecting the default pyusb backend.")
-            selected_backend = "pyusb"
+            logger.info("No backend stated. Selecting the default linux_kernel backend.")
+            selected_backend = "linux_kernel"
 
     be = backend_factory(selected_backend)
     list_available_devices = be['list_available_devices']
@@ -122,8 +122,8 @@ def status(
         try:
             selected_backend = guess_backend(printer_identifier)
         except ValueError:
-            logger.info("No backend stated. Selecting the default pyusb backend.")
-            selected_backend = "pyusb"
+            logger.info("No backend stated. Selecting the default linux_kernel backend.")
+            selected_backend = "linux_kernel"
     if selected_backend == "network":
         # Not implemented due to lack of an available test device
         raise NotImplementedError

brother_ql/brother_ql_debug.py

@@ -10,7 +10,7 @@
 
 class BrotherQL_USBdebug(object):
 
-    def __init__(self, dev, instructions_data, backend="pyusb"):
+    def __init__(self, dev, instructions_data, backend='linux_kernel'):
 
         be_cls = backend_factory(backend)['backend_class']
         self.be = be_cls(dev)

brother_ql/brother_ql_print.py

@@ -55,10 +55,8 @@ def main():
         try:
             selected_backend = guess_backend(args.printer)
         except:
-            logger.info(
-                "No backend stated. Selecting the default pyusb backend."
-            )
-            selected_backend = "pyusb"
+            logger.info("No backend stated. Selecting the default linux_kernel backend.")
+            selected_backend = 'linux_kernel'
 
     # List any printers found, if explicitly asked to do so or if no identifier has been provided.
     if args.list_printers or not args.printer:

brother_ql/cli.py

@@ -45,10 +45,10 @@ def cli(ctx, *args, **kwargs):
 @click.pass_context
 def discover(ctx):
     """find connected label printers"""
-    backend = ctx.meta.get("BACKEND", "pyusb")
+    backend = ctx.meta.get("BACKEND", "linux_kernel")
     if backend is None:
-        logger.info("Defaulting to pyusb as backend for discovery")
-        backend = "pyusb"
+        logger.info("Defaulting to linux_kernel as backend for discovery.")
+        backend = "linux_kernel"
     from brother_ql.backends.helpers import discover, status
 
     available_devices = discover(backend_identifier=backend)
@@ -65,7 +65,7 @@ def discover(ctx):
                 url = urlparse(device["identifier"])
                 if not os.access(url.path, os.W_OK):
                     logger.info(
-                        f"Cannot access device {device["identifier"]} due to insufficient permissions"
+                        f"Cannot access device {device["identifier"]} due to insufficient permissions. You need to be a part of the lp group to access printers with this backend."
                     )
                     continue
 
@@ -176,7 +176,7 @@ def env(ctx, *args, **kwargs):
 @click.pass_context
 def print_cmd(ctx, *args, **kwargs):
     """ Print a label of the provided IMAGE. """
-    backend = ctx.meta.get('BACKEND', 'pyusb')
+    backend = ctx.meta.get('BACKEND', 'linux_kernel')
     model = ctx.meta.get('MODEL')
     printer = ctx.meta.get('PRINTER')
     from brother_ql.conversion import convert