managementnode/lib/VCL/Module/OS/Linux.pm [2855:2877]:
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	my $self = shift;
	if (ref($self) !~ /linux/i) {
		notify($ERRORS{'CRITICAL'}, 0, "subroutine was called as a function, it must be called as a class method");
		return;
	}
	
	my $computer_node_name = $self->data->get_computer_node_name();
	
	my $user_parameters = shift;
	if (!$user_parameters) {
		notify($ERRORS{'WARNING'}, 0, "unable to create user, user parameters argument was not provided");
		return;
	}
	elsif (!ref($user_parameters) || ref($user_parameters) ne 'HASH') {
		notify($ERRORS{'WARNING'}, 0, "unable to create user, argument provided is not a hash reference");
		return;
	}
	
	my $username = $user_parameters->{username};
	if (!defined($username)) {
		notify($ERRORS{'WARNING'}, 0, "failed to create user on $computer_node_name, argument hash does not contain a 'username' key:\n" . format_data($user_parameters));
		return;
	}
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managementnode/lib/VCL/Module/OS/Linux.pm [5487:5509]:
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	my $self = shift;
	if (ref($self) !~ /linux/i) {
		notify($ERRORS{'CRITICAL'}, 0, "subroutine was called as a function, it must be called as a class method");
		return;
	}
	
	my $computer_node_name = $self->data->get_computer_node_name();
	my $user_parameters = shift;

	if (!$user_parameters) {
		notify($ERRORS{'WARNING'}, 0, "unable to create user, user parameters argument was not provided");
		return;
	}
	elsif (!ref($user_parameters) || ref($user_parameters) ne 'HASH') {
		notify($ERRORS{'WARNING'}, 0, "unable to create user, argument provided is not a hash reference");
		return;
	}

	my $username = $user_parameters->{username};
	if (!defined($username)) {
		notify($ERRORS{'WARNING'}, 0, "failed to create user on $computer_node_name, argument hash does not contain a 'username' key:\n" . format_data($user_parameters));
		return;
	}
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