[Bug 1569289] [NEW] glance should support the root-tar disk format

[James Page]

Public bug reported:

'root-tar' (indicating a root filesystem in tar archive format) has been
used for full system containers in OpenStack both under the libvirt/lxc
driver and under the new lxd driver (nova-lxd package).

Users are working around the lack of 'root-tar' default support in
glance by uploading images in this format as 'raw' (which is incorrect)
or updating the list of supported disk formats using the glance-api
configuration file to include 'root-tar'.

We should consider adding this to the list of defaults for supported
disk formats.

** Affects: glance (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

- 'root-tar' (indicating a root filesystem in tar archive format) as been
+ 'root-tar' (indicating a root filesystem in tar archive format) has been
  used for full system containers in OpenStack both under the libvirt/lxc
  driver and under the new lxd driver (nova-lxd package).
  
  Users are working around the lack of 'root-tar' default support in
  glance by uploading images in this format as 'raw' (which is incorrect)
  or updating the list of supported disk formats using the glance-api
  configuration file.

** Description changed:

  'root-tar' (indicating a root filesystem in tar archive format) has been
  used for full system containers in OpenStack both under the libvirt/lxc
  driver and under the new lxd driver (nova-lxd package).
  
  Users are working around the lack of 'root-tar' default support in
  glance by uploading images in this format as 'raw' (which is incorrect)
  or updating the list of supported disk formats using the glance-api
- configuration file.
+ configuration file to include 'root-tar'.
+ 
+ We should consider adding this to the list of defaults for supported
+ disk formats.

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https://bugs.launchpad.net/bugs/1569289

Title:
  glance should support the root-tar disk format

Status in glance package in Ubuntu:
  New

Bug description:
  'root-tar' (indicating a root filesystem in tar archive format) has
  been used for full system containers in OpenStack both under the
  libvirt/lxc driver and under the new lxd driver (nova-lxd package).

  Users are working around the lack of 'root-tar' default support in
  glance by uploading images in this format as 'raw' (which is
  incorrect) or updating the list of supported disk formats using the
  glance-api configuration file to include 'root-tar'.

  We should consider adding this to the list of defaults for supported
  disk formats.

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