How to reserve the original variants while upgrading a port in MacPorts?

When I upgrade some ports, I notice the upgraded port might change its variants. Is it normal or my mis-observation?

Let's say the original variants for git-core is +bash_completion +doc +python26 +svn, but if I just do sudo port upgrade git-core, it would change to +bash_completion +doc +python27! And that would force the installation of python27! How开发者_JAVA技巧 could I prevent this issue happening?

Yes you are correct, variants can change.

As git-core now has the default variants +python27 (among others) you have 3 options:

• Live with it
• Upgrade it by hand
• Set default variants in ${PREFIX}/etc/macports/variants.conf to the things you like.

Hope this helps :)