namespace :log do
  desc "Truncates all *.log files in log/ to zero bytes"
  task :clear_all do
    FileList["#{RAILS_ROOT}/log/*.out"].each do |log_file|
      f = File.open(log_file, "w")
      f.close
    end
    FileList["#{RAILS_ROOT}/log/*.err"].each do |log_file|
      f = File.open(log_file, "w")
      f.close
    end
    FileList["#{RAILS_ROOT}/log/*.log"].each do |log_file|
      f = File.open(log_file, "w")
      f.close
    end
  end
end

#调用上面的Rake任务

require 'rake'
Rake.application.rake_require 'http://www.cnblogs.com/lib/tasks/clear_daemon_log'
Rake.application['log:clear_all'].invoke

0 1,13 * * * RAILS_ENV=production /.../current/script/runner /.../current/script/dbcleaner

crontab -l -u user

%prep
echo Building %{name}-%{version}-%{release}

# Since we'll be copying the files from the repository checkout instead of
# extracting a tarball (-T), we only need to create the target directory (-c).
%setup -q -T -c

%build

%clean
#rm -rf %{buildroot}

%install
rm -rf %{buildroot}
mkdir -p %{buildroot}/var/spool/cron
cp %{SOURCE0} %{buildroot}/var/spool/cron/××