passenger_free_
ruby如何运作？
我使用phusion提供的apt包安装了phusion乘客.我的系统ruby是使用brightBox apt软件包安装的ruby2.1.我希望/etc/apache2/mods-enabled/passenger.conf使用/usr/bin/ruby作为PassengerDefaultRuby的默认值.它使用/usr/bin/passenger_free_ruby.
passenger_free_ruby就像ruby一样,是预期的ruby
/usr/bin/passenger_free_ruby -v ruby 2.1.6p336 (2015-04-13 revision 50298) [x86_64-linux-gnu]
如果我将ruby升级到ruby2.2,那么passenger_free_ruby就像ruby2.2一样运行
/usr/bin/passenger_free_ruby -v ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-linux-gnu]
那么passenger_free_ruby实际上做了什么？自由是什么意思？为什么不使用/usr/bin/ruby作为默认的ruby？
解决方法
其存在的原因记录于
the executable’s source code.
/* * This is a simple program for executing either the 'ruby' command in PATH,* or one of the Ruby versions installable by APT. This is necessary because * Debian 6 and Debian 8 (among others) do not install /usr/bin/ruby upon * installing one of the versioned Ruby packages (e.g. apt-get install ruby2.1). * Commands such as 'passenger' are supposed to be runnable under any Ruby * interpreter the user desires,including non-APT-installed Rubies,but we can't * just set the shebang line to '#!/usr/bin/env ruby'. This problem is solved by * setting the shebang line to '#!/usr/bin/passenger_default_ruby'. */
