Fix linting issues

pyproject.toml

@@ -96,6 +96,7 @@ ignore = [
     "ARG002", "PLR6301",  # TODO Unused self, parameter in methods definitions
     "PLR09",  # Too many branches/statements/arguments
     "PLW1514", # TODO `open` in text mode without explicit `encoding` argument
+    "UP031",  # Use format specifiers instead of percent format
 ]
 [tool.ruff.lint.flake8-quotes]
 # Single quotes are currently prevalent in the codebase. Not being checked.

src/targetcli/targetclid.py

@@ -153,7 +153,7 @@ def client_thread(self, connection):
                 connection.close()
                 still_listen = False
             else:
-                self.con._stdout = self.con._stderr = f = tempfile.NamedTemporaryFile(mode='w', delete=False)
+                self.con._stdout = self.con._stderr = f = tempfile.NamedTemporaryFile(mode='w', delete=False)  # noqa: SIM115
                 try:
                     # extract multiple commands delimited with '%'
                     list_data = data.decode().split('%')

src/targetcli/ui_backstore.py

@@ -545,9 +545,7 @@ def _ui_block_ro_check(self, dev):
             return False
 
         os.close(f)
-        if struct.unpack('I', buf)[0] == 0:
-            return False
-        return True
+        return struct.unpack('I', buf)[0] != 0
 
     def ui_command_create(self, name, dev, readonly=None, wwn=None,
                           exclusive=None):

src/targetcli/ui_root.py

@@ -155,8 +155,7 @@ def _save_backups(self, savefile):
                     prefs = Path(universal_prefs_file).read_text()
                     backups = [line for line in prefs.splitlines() if re.match(
                         r'^max_backup_files\s*=', line)]
-                    if max_backup_files < int(backups[0].split('=')[1].strip()):
-                        max_backup_files = int(backups[0].split('=')[1].strip())
+                    max_backup_files = max(max_backup_files, int(backups[0].split('=')[1].strip()))
                 except:
                     self.shell.log.debug(f"No universal prefs file '{universal_prefs_file}'.")