诗歌rails之关于ruby script/runner

    Rails开发的时候，估计console和Debug我们会比较多用，JE上搜Script/runner没有什么相关的资料。

    runner和console一样是内置在script下的命令，也非常类似的提供console的功能，只不过是console针对的是命令行，runner针对的是文件。换句话说，都是提供Rails执行环境。

    runner最大可能的应用，在于定时执行。例如，你的Rake任务，对于一些没有满足条件的用户发送邮件通知，每晚执行：

    我们的需求是，每天晚上，用户不怎么访问的时候检查系统日志，如果，超过范围就清理日志：
1. 在lib下建立文件rake任务clear_daemon_log

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

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

2. 在script下建立文件logclean

#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

#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

3. 如下调用

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

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

4. 查看cron

crontab -l -u user

crontab -l -u user

5. 通过spec生成rpm

%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/××

%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/××

这样在系统安装的时候，就可以执行这个cron了