scripts/qmp-shell: fix shell history exception handling

We want to remove exceptions that are too broad here; we only want to
catch IOErrors that get raised as a direct result of the open call.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-id: 20210607200649.1840382-15-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>

diff --git a/scripts/qmp/qmp-shell b/scripts/qmp/qmp-shell
index afb4b0c544c85e3f7dabcf6d4a195a3581f99041..80cd432607f3368ebbc0742c9e3b61c0fb9aa2dc 100755 (executable)
--- a/scripts/qmp/qmp-shell
+++ b/scripts/qmp/qmp-shell
@@ -67,7 +67,6 @@
 
 import ast
 import atexit
-import errno
 import json
 import os
 import re
@@ -143,19 +142,17 @@ class QMPShell(qmp.QEMUMonitorProtocol):
         readline.set_completer_delims('')
         try:
             readline.read_history_file(self._histfile)
-        except Exception as e:
-            if isinstance(e, IOError) and e.errno == errno.ENOENT:
-                # File not found. No problem.
-                pass
-            else:
-                print("Failed to read history '%s'; %s" % (self._histfile, e))
+        except FileNotFoundError:
+            pass
+        except IOError as err:
+            print(f"Failed to read history '{self._histfile}': {err!s}")
         atexit.register(self.__save_history)
 
     def __save_history(self):
         try:
             readline.write_history_file(self._histfile)
-        except Exception as e:
-            print("Failed to save history file '%s'; %s" % (self._histfile, e))
+        except IOError as err:
+            print(f"Failed to save history file '{self._histfile}': {err!s}")
 
     @classmethod
     def __parse_value(cls, val):