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Description of problem:
Follow these steps to see the problem:

# subscription-manager-cli reregister --username=testuser1 --password=password
9de87421-1ab4-4db4-8598-95274a8c6e4f testuser1
# subscription-manager-cli subscribe to many pools... <SNIP>^C
# rm /etc/pki/consumer/cert.pem
rm: remove regular file `/etc/pki/consumer/cert.pem'? y
# subscription-manager-cli reregister --username=testuser1 --password=password
ec3313c1-cd24-4b63-a74c-859639891e4d testuser1


Notice that this reregister did not actually reregister.  In fact, it actually issued a new register under the covers and returned a new uuid.  The consequence of this action is that this consuming system has now unintentionally lost all the entitlements to the pools that it had originally subscribed to.  In my opinion this is a severe consequence.  I think that the reregister request should have been blocked.

Would like to see stdout similar to this:
Could not reregister without a valid consumerid.


Version-Release number of selected component (if applicable):
candlepin b12cb4ca80b4464ada6cce9fae50ff56d45f7bef

# rpm -q subscription-manager
subscription-manager-0.75-1.git.16.7e1e0ba.fc12.i386

Per 7946c8b0782eb01311c9074742fb829266356c72 the logic for this command has been deprecated. The identity command now will only regenerate the certificate.

[root@jweiss-rhel6-1 src]# ./subscription-manager-cli register --consumerid=6f4d01f2-03c2-4b36-813f-e7866e952073 -
-username=testuser1 --password=password
6f4d01f2-03c2-4b36-813f-e7866e952073 testuser1
[root@jweiss-rhel6-1 src]# ./subscription-manager-cli list
+-------------------------------------------+
    Installed Product Status
+-------------------------------------------+

ProductName:            RHEL for Workstations SVC
Status:                 Not Installed            
Expires:                2011-10-04               
Subscription:           721286381979858208       
ContractNumber:         2                        

[root@jweiss-rhel6-1 src]# 

Seems to be working

This bug was opened/resolved/closed against the Entitlement-Alpha release.