How to show all versions of a library from specified repo?

I thought I've uploaded a rpm with version myserv-2-7.rpm to a custom repo myrepo1, but when I use:

yum --enablerepo myrepo1 install myserv

It installed a different version of myserv from another repo.

I want to identify the problem, but don't know how to do it.

How to use yum to view the existing versions of a lib from specified repo?

I just want to know in repo myrepo1, is there any myserv, and what're the versions are they if there are.

Finally found the answer:

1. show all versions of a lib:

   yum list available gcc --showduplicates
   

2. show specified repo only

   yum --disablerepo="*" --enablerepo="google" list available gcc --showduplicates