Bug 251345

Installing a second version of the same package can lead to the first version's
files being silently overwritten instead of throwing up an error about
conflicting files.

I'll attach my test-case specfiles, but the steps to reproduce it are:

[root@rutabaga ~]# rpm -q test
package test is not installed
[root@rutabaga ~]# rpm -i test-1-1.i386.rpm 
[root@rutabaga ~]# rpm -V test-1-1
[root@rutabaga ~]# rpm -i test-2-1.i386.rpm 
[root@rutabaga ~]# rpm -V test-2-1
[root@rutabaga ~]# rpm -V test-1-1
..5....T   /lib/modules/test/test.ko

At this point, the file from test-1-1 has been overwritten by the one from
test-2-1. Furthermore:

[root@rutabaga ~]# rpm -e test-1-1
[root@rutabaga ~]# rpm -V test-2-1
missing     /lib/modules/test/test.ko

Removing the old version now causes the new one's file to be removed leading to
much breakage.

This is with the latest F7 packages (rpm-4.4.2-46.fc7), although I've also seen
the same behaviour on RHEL4.5.