[Bug 611137] Re: cc_mounts may need to translate device names for xvda or virtio

[Jos Boumans]

** Description changed:

  As shown in cloud-config syntax at [1], cloud-init allows the user to a name that will appear in the metadata service instead of a device name.  For example, the user can specify:
-   - [ ephemeral0, /mnt, auto, "defaults,noexec" ]
+   - [ ephemeral0, /mnt, auto, "defaults,noexec" ]
  
  If the metadata service contains something like:
-  'block-device-mapping': {'ami': 'sda1',
-                           'ephemeral0': 'sda2',
-                           'root': '/dev/sda1',
-                           'swap': 'sda3'},
+  'block-device-mapping': {'ami': 'sda1',
+                           'ephemeral0': 'sda2',
+                           'root': '/dev/sda1',
+                           'swap': 'sda3'},
  
  Then an entry in /etc/fstab will be added for 'sda2'.
  
  There are 2 possibilities that the string 'sda2' will be wrong.
  a.) on ec2, we're using a -virtual kernel, or some kernel without a patch to make xen block devices show up as 'sdX' rather than 'xvdX'.  Currently our -ec2 kernels have xen block devices as sdX, but this may change.
  b.) on eucalyptus, with virtio as root device and/or ebs.  In this case, the metadata service will still likely have 'sdX' but the kernel devices would be named vdX.
  
  In either case, some trickery will have to be done to decide to rename.
  
  Really, this is just a general problem with the metadata service
  provided by the hypervisor believing it knows certain things about the
  OS that is running in it.
  
  --
  [1] http://bazaar.launchpad.net/~cloud-init-dev/cloud-init/trunk/annotate/head%3A/doc/examples/cloud-config.txt
  
  ProblemType: Bug
  DistroRelease: Ubuntu 10.10
  Package: eucalyptus-nc 2.0~bzr1211-0ubuntu1
  ProcVersionSignature: User Name 2.6.32-305.9-ec2 2.6.32.11+drm33.2
  Uname: Linux 2.6.32-305-ec2 i686
  Architecture: i386
  Date: Thu Jul 29 03:06:03 2010
  Ec2AMI: ami-e930db80
  Ec2AMIManifest: ubuntu-images-testing-us/ubuntu-maverick-daily-i386-server-20100727.manifest.xml
  Ec2AvailabilityZone: us-east-1b
  Ec2InstanceType: m1.small
  Ec2Kernel: aki-407d9529
  Ec2Ramdisk: unavailable
  ProcEnviron:
-  PATH=(custom, user)
-  LANG=en_US.UTF-8
-  SHELL=/bin/bash
+  PATH=(custom, user)
+  LANG=en_US.UTF-8
+  SHELL=/bin/bash
  SourcePackage: eucalyptus

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https://bugs.launchpad.net/bugs/611137

Title:
  cc_mounts may need to translate device names for xvda or virtio

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