Support option interpolation across groups

Registered by Miguel Grinberg on 2014-10-25

The option value interpolation feature only works within a group. This is a proposal to extend this feature to also support interpolation across groups.

The current template syntax allows two forms to specify placeholders: $option and ${option}. The bracketed syntax can easily be extended to also support a group specification as ${group.option}. To remain backwards compatible the non-bracketed syntax will not be modified.

This enhancement will be implemented with a simple change to the regular expression used by string.Template that enables the new group aware syntax to be recognized.

Blueprint information

Status:
Started
Approver:
None
Priority:
Undefined
Drafter:
Miguel Grinberg
Direction:
Needs approval
Assignee:
Miguel Grinberg
Definition:
New
Series goal:
None
Implementation:
Needs Code Review
Milestone target:
None
Started by
Miguel Grinberg on 2014-10-30

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Gerrit topic: https://review.openstack.org/#q,topic:bp/group-option-interpolation,n,z

Addressed by: https://review.openstack.org/130915
    Support groups in option value interpolation

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