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#cloud-config
# Cloud-init supports the creation of simple partition tables and filesystems
# on devices.

# Default disk definitions for AWS
# --------------------------------
# (Not implemented yet, but provided for future documentation)

disk_setup:
  ephemeral0:
    table_type: 'mbr'
    layout: True
    overwrite: False

fs_setup:
  - label: None,
    filesystem: ext3
    device: ephemeral0
    partition: auto

# Default disk definitions for Microsoft Azure
# ------------------------------------------

device_aliases: {'ephemeral0': '/dev/sdb'}
disk_setup:
  ephemeral0:
    table_type: mbr
    layout: True
    overwrite: False

fs_setup:
  - label: ephemeral0
    filesystem: ext4
    device: ephemeral0.1
    replace_fs: ntfs


# Data disks definitions for Microsoft Azure
# ------------------------------------------

disk_setup:
  /dev/disk/azure/scsi1/lun0:
    table_type: gpt
    layout: True
    overwrite: True

fs_setup:
  - device: /dev/disk/azure/scsi1/lun0
    partition: 1
    filesystem: ext4


# Default disk definitions for SmartOS
# ------------------------------------

device_aliases: {'ephemeral0': '/dev/vdb'}
disk_setup:
  ephemeral0:
    table_type: mbr
    layout: False
    overwrite: False

fs_setup:
  - label: ephemeral0
    filesystem: ext4
    device: ephemeral0.0

# Caveat for SmartOS: if ephemeral disk is not defined, then the disk will
#    not be automatically added to the mounts.


# The default definition is used to make sure that the ephemeral storage is
# setup properly.

# "disk_setup": disk partitioning
# --------------------------------

# The disk_setup directive instructs Cloud-init to partition a disk. The format is:

disk_setup:
  ephemeral0:
    table_type: 'mbr'
    layout: true
  /dev/xvdh:
    table_type: 'mbr'
    layout:
      - 33
      - [33, 82]
      - 33
    overwrite: True

# The format is a list of dicts of dicts. The first value is the name of the
# device and the subsequent values define how to create and layout the
# partition.
# The general format is:
#   disk_setup:
#     <DEVICE>:
#       table_type: 'mbr'
#       layout: <LAYOUT|BOOL>
#       overwrite: <BOOL>
#
# Where:
#   <DEVICE>: The name of the device. 'ephemeralX' and 'swap' are special
#               values which are specific to the cloud. For these devices
#               Cloud-init will look up what the real devices is and then
#               use it.
#
#               For other devices, the kernel device name is used. At this
#               time only simply kernel devices are supported, meaning
#               that device mapper and other targets may not work.
#
#               Note: At this time, there is no handling or setup of
#               device mapper targets.
#
#   table_type=<TYPE>: Currently the following are supported:
#                   'mbr': default and setups a MS-DOS partition table
#                   'gpt': setups a GPT partition table
#
#               Note: At this time only 'mbr' and 'gpt' partition tables
#                   are allowed. It is anticipated in the future that
#                   we'll also have "RAID" to create a mdadm RAID.
#
#   layout={...}: The device layout. This is a list of values, with the
#               percentage of disk that partition will take.
#               Valid options are:
#                   [<SIZE>, [<SIZE>, <PART_TYPE]]
#
#               Where <SIZE> is the _percentage_ of the disk to use, while
#               <PART_TYPE> is the numerical value of the partition type.
#
#               The following setups two partitions, with the first
#               partition having a swap label, taking 1/3 of the disk space
#               and the remainder being used as the second partition.
#                 /dev/xvdh':
#                   table_type: 'mbr'
#                   layout:
#                     - [33,82]
#                     - 66
#                   overwrite: True
#
#               When layout is "true" it means single partition the entire
#               device.
#
#               When layout is "false" it means don't partition or ignore
#               existing partitioning.
#
#               If layout is set to "true" and overwrite is set to "false",
#               it will skip partitioning the device without a failure.
#
#   overwrite=<BOOL>: This describes whether to ride with safetys on and
#               everything holstered.
#
#               'false' is the default, which means that:
#                   1. The device will be checked for a partition table
#                   2. The device will be checked for a filesystem
#                   3. If either a partition of filesystem is found, then
#                       the operation will be _skipped_.
#
#               'true' is cowboy mode. There are no checks and things are
#                   done blindly. USE with caution, you can do things you
#                   really, really don't want to do.
#
#
# fs_setup: Setup the filesystem
# ------------------------------
#
# fs_setup describes the how the filesystems are supposed to look.

fs_setup:
  - label: ephemeral0
    filesystem: 'ext3'
    device: 'ephemeral0'
    partition: 'auto'
  - label: mylabl2
    filesystem: 'ext4'
    device: '/dev/xvda1'
  - cmd: mkfs -t %(filesystem)s -L %(label)s %(device)s
    label: mylabl3
    filesystem: 'btrfs'
    device: '/dev/xvdh'

# The general format is:
#   fs_setup:
#     - label: <LABEL>
#       filesystem: <FS_TYPE>
#       device: <DEVICE>
#       partition: <PART_VALUE>
#       overwrite: <OVERWRITE>
#       replace_fs: <FS_TYPE>
#
# Where:
#   <LABEL>: The filesystem label to be used. If set to None, no label is
#     used.
#
#   <FS_TYPE>: The filesystem type. It is assumed that the there
#     will be a "mkfs.<FS_TYPE>" that behaves likes "mkfs". On a standard
#     Ubuntu Cloud Image, this means that you have the option of ext{2,3,4},
#     and vfat by default.
#
#   <DEVICE>: The device name. Special names of 'ephemeralX' or 'swap'
#     are allowed and the actual device is acquired from the cloud datasource.
#     When using 'ephemeralX' (i.e. ephemeral0), make sure to leave the
#     label as 'ephemeralX' otherwise there may be issues with the mounting
#     of the ephemeral storage layer.
#
#     If you define the device as 'ephemeralX.Y' then Y will be interpetted
#     as a partition value. However, ephermalX.0 is the _same_ as ephemeralX.
#
#   <PART_VALUE>:
#     Partition definitions are overwritten if you use the '<DEVICE>.Y' notation.
#
#     The valid options are:
#     "auto|any": tell cloud-init not to care whether there is a partition
#       or not. Auto will use the first partition that does not contain a
#       filesystem already. In the absence of a partition table, it will
#       put it directly on the disk.
#
#       "auto": If a filesystem that matches the specification in terms of
#       label, filesystem and device, then cloud-init will skip the creation
#       of the filesystem.
#
#       "any": If a filesystem that matches the filesystem type and device,
#       then cloud-init will skip the creation of the filesystem.
#
#       Devices are selected based on first-detected, starting with partitions
#       and then the raw disk. Consider the following:
#           NAME     FSTYPE LABEL
#           xvdb
#           |-xvdb1  ext4
#           |-xvdb2
#           |-xvdb3  btrfs  test
#           \-xvdb4  ext4   test
#
#         If you ask for 'auto', label of 'test, and filesystem of 'ext4'
#         then cloud-init will select the 2nd partition, even though there
#         is a partition match at the 4th partition.
#
#         If you ask for 'any' and a label of 'test', then cloud-init will
#         select the 1st partition.
#
#         If you ask for 'auto' and don't define label, then cloud-init will
#         select the 1st partition.
#
#         In general, if you have a specific partition configuration in mind,
#         you should define either the device or the partition number. 'auto'
#         and 'any' are specifically intended for formatting ephemeral storage
#         or for simple schemes.
#
#       "none": Put the filesystem directly on the device.
#
#       <NUM>: where NUM is the actual partition number.
#
#   <OVERWRITE>: Defines whether or not to overwrite any existing
#     filesystem.
#
#     "true": Indiscriminately destroy any pre-existing filesystem. Use at
#         your own peril.
#
#     "false": If an existing filesystem exists, skip the creation.
#
#   <REPLACE_FS>: This is a special directive, used for Microsoft Azure that
#     instructs cloud-init to replace a filesystem of <FS_TYPE>. NOTE:
#     unless you define a label, this requires the use of the 'any' partition
#     directive.
#
# Behavior Caveat: The default behavior is to _check_ if the filesystem exists.
#   If a filesystem matches the specification, then the operation is a no-op.