[Bug 1316475] Re: [SRU] CloudSigma DS for causes hangs when serial console present

[Ben Howard]

** Description changed:

- DHCPDISCOVER on eth2 to 255.255.255.255 port 67 interval 3 (xid=0x7e777c23)  
+ SRU Justification
+ 
+ Impact: The Cloud Sigma Datasource read and writes to /dev/ttyS1 if
+ present; the Datasource does not have a time out. On non-CloudSigma
+ Clouds or systems w/ /dev/ttyS1, Cloud-init will block pending a
+ response, which may never come. Further, it is dangerous for a default
+ datasource to write blindly on a serial console as other control plane
+ software and Clouds use /dev/ttyS1 for communication.
+ 
+ Fix: The patch disables Cloud Sigma by default.
+ 
+ Verification:
+ 1. Purge Cloud-init
+ 2. Install from -proposed
+ 3. Look in /etc/cloud/cloud.d/90_dpkg.cfg, and confirm CloudSigma is not in the list of datasources. 
+ 
+ Regression: The risk is low, except on CloudSigma targets which try to
+ use new images generated with the new Cloud-init version.
+ 
+ 
+ [Original Report]
+ DHCPDISCOVER on eth2 to 255.255.255.255 port 67 interval 3 (xid=0x7e777c23)
  DHCPREQUEST of 10.22.157.186 on eth2 to 255.255.255.255 port 67 (xid=0x7e777c23)
- DHCPOFFER of 10.22.157.186 from 10.22.157.149                                    
- DHCPACK of 10.22.157.186 from 10.22.157.149                                     
- bound to 10.22.157.186 -- renewal in 39589 seconds.                             
-  * Starting Mount network filesystems                                    [ OK ] 
-  * Starting configure network device                                     [ OK ] 
-  * Stopping Mount network filesystems                                    [ OK ] 
-  * Stopping DHCP any connected, but unconfigured network interfaces      [ OK ] 
-  * Starting configure network device                                     [ OK ] 
-  * Stopping DHCP any connected, but unconfigured network interfaces      [ OK ] 
-  * Starting configure network device                                     [ OK ] 
+ DHCPOFFER of 10.22.157.186 from 10.22.157.149
+ DHCPACK of 10.22.157.186 from 10.22.157.149
+ bound to 10.22.157.186 -- renewal in 39589 seconds.
+  * Starting Mount network filesystems                                    [ OK ]
+  * Starting configure network device                                     [ OK ]
+  * Stopping Mount network filesystems                                    [ OK ]
+  * Stopping DHCP any connected, but unconfigured network interfaces      [ OK ]
+  * Starting configure network device                                     [ OK ]
+  * Stopping DHCP any connected, but unconfigured network interfaces      [ OK ]
+  * Starting configure network device                                     [ OK ]
  
  And it stops there.
  
  I see this on about 10% of deploys.

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Title:
  [SRU] CloudSigma DS for causes hangs when serial console present

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