Backport: Check availability of dnf-automatic config file #2178
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Upstream commit: aab7def Some, but not all, types of connection error are caught by smtplib and reraised as an smtplib.SMTPException. Notably, TimeoutError, socket.gaierror (name resolution failure), and ConnectionRefusedError and are not caught. The more generic OSError should be caught here instead. Resolves #1905 Resolves: https://issues.redhat.com/browse/RHEL-46030
If a configuration file is explicitly specified on the command line, ensure that it exists and is readable. If the file is not found, notify the user immediately and terminate the process. This resolves issues where users may run dnf-automatic with unrecognized positional arguments, such as `dnf-automatic install`. The most natural approach to handle a non-existing config file would be by catching the exception thrown by the `read()` method of the `libdnf.conf.ConfigParser` class. Unfortunately, the Python bindings override the `read()` method at the SWIG level, causing it to suppress any potentially raised IOError. For details see this section of the commit rpm-software-management/libdnf@8f1fedf def ConfigParser__newRead(self, filenames): parsedFNames = [] try: if isinstance(filenames, str) or isinstance(filenames, unicode): filenames = [filenames] except NameError: pass for fname in filenames: try: self.readFileName(fname) parsedFNames.append(fname) except IOError: pass except Exception as e: raise RuntimeError("Parsing file '%s' failed: %s" % (fname, str(e))) return parsedFNames ConfigParser.read = ConfigParser__newRead Resolves: https://issues.redhat.com/browse/RHEL-46030
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Resolves: https://issues.redhat.com/browse/RHEL-46030