rpm规格文件的安装后脚本中的yum / rpm install命令

Question

I would like to create .rpm file with optional dependencies. ie if "dependency" is not installed because of missing file/network issues, the entire rpm install should not halt.
Whereas in "Weakdependency" section of http://www.rpm.org/wiki/PackagerDocs/Dependencies states that it is not supported by RPM specification. So i want to do turnaround approach by putting optional dependency packages in "post" install script. When i am including "yum install " in the postscript, at the time of execution it is going into waiting state (with no messages), when i killed process it giving messages like this..

Non-fatal POSTIN scriptlet failure in rpm package
Another app is currently holding the yum lock; waiting for it to exit...
  The other application is: yum
    Memory :  71 M RSS (365 MB VSZ)
    Started: Wed Mar 18 13:17:45 2015 - 00:16 ago
    State  : Sleeping, pid: 3870

Required packages are getting installed properly with this error in optional dependencies. I think it is going to deadlock situation as both yum processes are waiting for completion of others.
Is there any better way to fix this type of optional dependency issue in RPM standard?

Answer 1

I would create a shell script that does what you need and leave 'yum' out of your spec file because of this problem ( package installtion issue , rpm spec file , which include yum to install dependence ).

In the shell script (similar to any install.sh script), have it check on optional dependencies and install them if needed along with the RPM described in your post.