scripts/qom-fuse: Apply pylint rules

- Catch specific exceptions from QMP
- Reraise errors with explicit context
- method parameters should match parent's names

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-id: 20210603003719.1321369-11-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>

diff --git a/scripts/qmp/qom-fuse b/scripts/qmp/qom-fuse
index ca30e928679ef8647e753822941fab30db803eb6..805e99c8ecde9f04f922c09b5d1e46b45bb21409 100755 (executable)
--- a/scripts/qmp/qom-fuse
+++ b/scripts/qmp/qom-fuse
@@ -23,7 +23,7 @@ from fuse import FUSE, FuseOSError, Operations
 
 
 sys.path.append(os.path.join(os.path.dirname(__file__), '..', '..', 'python'))
-from qemu.qmp import QEMUMonitorProtocol
+from qemu.qmp import QEMUMonitorProtocol, QMPResponseError
 
 
 fuse.fuse_python_api = (0, 2)
@@ -47,7 +47,7 @@ class QOMFS(Operations):
         try:
             self.qmp.command('qom-list', path=path)
             return True
-        except:
+        except QMPResponseError:
             return False
 
     def is_property(self, path):
@@ -59,7 +59,7 @@ class QOMFS(Operations):
                 if item['name'] == prop:
                     return True
             return False
-        except:
+        except QMPResponseError:
             return False
 
     def is_link(self, path):
@@ -73,10 +73,10 @@ class QOMFS(Operations):
                         return True
                     return False
             return False
-        except:
+        except QMPResponseError:
             return False
 
-    def read(self, path, length, offset, fh):
+    def read(self, path, size, offset, fh):
         if not self.is_property(path):
             return -ENOENT
 
@@ -86,13 +86,13 @@ class QOMFS(Operations):
         try:
             data = self.qmp.command('qom-get', path=path, property=prop)
             data += '\n'  # make values shell friendly
-        except:
-            raise FuseOSError(EPERM)
+        except QMPResponseError as err:
+            raise FuseOSError(EPERM) from err
 
         if offset > len(data):
             return ''
 
-        return bytes(data[offset:][:length], encoding='utf-8')
+        return bytes(data[offset:][:size], encoding='utf-8')
 
     def readlink(self, path):
         if not self.is_link(path):