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[Hannes Schmidt <hannes@xxxxxxxx>]

Public bug reported:

1) Create an m1.small instance starting with a stock Raring AMI.
2) Create a new EBS-backed AMI from that instance
3) Create a t1.micro instance with user-data 

mounts:
- [ephemeral0, null]

4) look at /etc/fstab

Expected: There should be no entry for the ephemeral device.

Actual: There is

/dev/xvdb       /mnt/ephemeral  auto
defaults,nobootwait,comment=cloudconfig 0       2

cc_mounts.py adds the entry to fstab in step 1) but then fails to remove
the entry in step 3) because it bails out prematurely in line

https://github.com/number5/cloud-
init/blob/0.7.2/cloudinit/config/cc_mounts.py#L155

before it has a chance to filter the line in

https://github.com/number5/cloud-
init/blob/0.7.2/cloudinit/config/cc_mounts.py#L175

The relevant (I hope) log lines are

Mar 13 06:28:08 ip-10-222-249-176 [CLOUDINIT] helpers.py[DEBUG]: Running config-disk-setup using lock (<FileLock using file '/var/lib/cloud/instances/i-77144128/sem/config_disk_setu
p'>)
Mar 13 06:28:08 ip-10-222-249-176 [CLOUDINIT] util.py[DEBUG]: Writing to /var/lib/cloud/instances/i-77144128/sem/config_mounts - wb: [420] 19 bytes
Mar 13 06:28:08 ip-10-222-249-176 [CLOUDINIT] helpers.py[DEBUG]: Running config-mounts using lock (<FileLock using file '/var/lib/cloud/instances/i-77144128/sem/config_mounts'>)
Mar 13 06:28:08 ip-10-222-249-176 [CLOUDINIT] cc_mounts.py[DEBUG]: Attempting to determine the real name of ephemeral0
Mar 13 06:28:08 ip-10-222-249-176 [CLOUDINIT] cc_mounts.py[DEBUG]: Ignorming nonexistant named mount ephemeral0
Mar 13 06:28:08 ip-10-222-249-176 [CLOUDINIT] cc_mounts.py[DEBUG]: Attempting to determine the real name of ephemeral0
Mar 13 06:28:08 ip-10-222-249-176 [CLOUDINIT] cc_mounts.py[DEBUG]: Ignoring nonexistant default named mount ephemeral0
Mar 13 06:28:08 ip-10-222-249-176 [CLOUDINIT] cc_mounts.py[DEBUG]: Attempting to determine the real name of swap
Mar 13 06:28:08 ip-10-222-249-176 [CLOUDINIT] DataSourceEc2.py[DEBUG]: Unable to convert swap to a device
Mar 13 06:28:08 ip-10-222-249-176 [CLOUDINIT] cc_mounts.py[DEBUG]: Ignoring nonexistant default named mount swap
Mar 13 06:28:08 ip-10-222-249-176 [CLOUDINIT] cc_mounts.py[DEBUG]: Skipping non-existent device named ephemeral0
Mar 13 06:28:08 ip-10-222-249-176 [CLOUDINIT] cc_mounts.py[DEBUG]: No modifications to fstab needed.

** Affects: cloud-init
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1291820

Title:
  cc_mounts.py fails to remove ephemeral entry from fstab

Status in Init scripts for use on cloud images:
  New

Bug description:
  1) Create an m1.small instance starting with a stock Raring AMI.
  2) Create a new EBS-backed AMI from that instance
  3) Create a t1.micro instance with user-data 

  mounts:
  - [ephemeral0, null]

  4) look at /etc/fstab

  Expected: There should be no entry for the ephemeral device.

  Actual: There is

  /dev/xvdb       /mnt/ephemeral  auto
  defaults,nobootwait,comment=cloudconfig 0       2

  cc_mounts.py adds the entry to fstab in step 1) but then fails to
  remove the entry in step 3) because it bails out prematurely in line

  https://github.com/number5/cloud-
  init/blob/0.7.2/cloudinit/config/cc_mounts.py#L155

  before it has a chance to filter the line in

  https://github.com/number5/cloud-
  init/blob/0.7.2/cloudinit/config/cc_mounts.py#L175

  The relevant (I hope) log lines are

  Mar 13 06:28:08 ip-10-222-249-176 [CLOUDINIT] helpers.py[DEBUG]: Running config-disk-setup using lock (<FileLock using file '/var/lib/cloud/instances/i-77144128/sem/config_disk_setu
  p'>)
  Mar 13 06:28:08 ip-10-222-249-176 [CLOUDINIT] util.py[DEBUG]: Writing to /var/lib/cloud/instances/i-77144128/sem/config_mounts - wb: [420] 19 bytes
  Mar 13 06:28:08 ip-10-222-249-176 [CLOUDINIT] helpers.py[DEBUG]: Running config-mounts using lock (<FileLock using file '/var/lib/cloud/instances/i-77144128/sem/config_mounts'>)
  Mar 13 06:28:08 ip-10-222-249-176 [CLOUDINIT] cc_mounts.py[DEBUG]: Attempting to determine the real name of ephemeral0
  Mar 13 06:28:08 ip-10-222-249-176 [CLOUDINIT] cc_mounts.py[DEBUG]: Ignorming nonexistant named mount ephemeral0
  Mar 13 06:28:08 ip-10-222-249-176 [CLOUDINIT] cc_mounts.py[DEBUG]: Attempting to determine the real name of ephemeral0
  Mar 13 06:28:08 ip-10-222-249-176 [CLOUDINIT] cc_mounts.py[DEBUG]: Ignoring nonexistant default named mount ephemeral0
  Mar 13 06:28:08 ip-10-222-249-176 [CLOUDINIT] cc_mounts.py[DEBUG]: Attempting to determine the real name of swap
  Mar 13 06:28:08 ip-10-222-249-176 [CLOUDINIT] DataSourceEc2.py[DEBUG]: Unable to convert swap to a device
  Mar 13 06:28:08 ip-10-222-249-176 [CLOUDINIT] cc_mounts.py[DEBUG]: Ignoring nonexistant default named mount swap
  Mar 13 06:28:08 ip-10-222-249-176 [CLOUDINIT] cc_mounts.py[DEBUG]: Skipping non-existent device named ephemeral0
  Mar 13 06:28:08 ip-10-222-249-176 [CLOUDINIT] cc_mounts.py[DEBUG]: No modifications to fstab needed.

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