+++ This bug was initially created as a clone of Bug #864889 +++

Description of problem:
On IPA server when AD trusts feature is enabled, winbind_krb5_locator.so plugin should not be available to libkrb5. This could be achieved by requiring that samba{,4}-winbind-krb5-locator package is never installed when ipa-server-trust-ad package is installed but much easier to automatically configure through alternatives.

Without this fix winbind_krb5_locator.so plugin to libkrb5 will interfere with winbindd configuration for IPA AD trusts, rendering them unusable.

--- Additional comment from pm-rhel on 2012-10-10 13:51:35 EEST ---

Since this bug report was entered in bugzilla, the release flag has been
set to ? to ensure that it is properly evaluated for this release.

--- Additional comment from abokovoy on 2012-10-10 13:54:22 EEST ---

Created attachment 624780 [details]
patch to introduce alternatives for winbind_krb5_locator.so

This is spec change that is needed to allow disabling winbind_krb5_locator.so plugin when trusts are in use on the server. Since libkrb5 reads any file in its plugins directory, keeping disabled plugin there is not an option, so I moved it back to %_libdir and used alternatives instead.

When trusts package (ipa-server-trust-ad) is installed, it will alternate to /dev/null for this plugin (link in plugins dir will point to /etc/alternatives/winbind_krb5_locator.so which will point to /dev/null). This will make libkrb5 to effectively ignore the plugin.

When trusts package is uninstalled, samba4 package will automatically be selected as a provider for the winbind_krb5_locator.so and will redirect the link to %_libdir/winbind_krb5_locator.so which is happily used by libkrb5