Generalise and clean up blueprint customization validation for image types #1216
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Add two new methods to the ImageType interface: - SupportedCustomizations(): Returns a list of strings that indicate customizations supported by an image type. - RequiredCustomizations(): Returns a list of strings that indicate the customizations required by an image type.
Add a reverse path field to the CustomizationError that encodes the path to the customization that caused an error. The path is constructed in reverse (bottom-up) for convenience when iterating or recursing through the blueprint structure and is reversed to top-down when printing the error message. This will be used to inform the user of the specific key that was added to a blueprint but wasn't supported (or required and not set) without any confusion arising from keys that share a name (e.g. kernel.name and user.name).
A validation function that takes a list of supported paths to keys and a
blueprint and checks that every value set in the blueprint is in the
list of supported options. This validator is similar to the existing
Customizations.CheckAllowed() function but it doesn't only check for
values on one level - it can check for supported values of arbitrary
depth. For example, the following value:
Customizations.Kernel.Name
means that the Name field of the Kernel customization is supported and
if no other item is listed, it also implies that the Kernel.Append
customization is not supported.
This also works with array types, meaning:
Customizations.User.Name
Customizations.User.SSHKey
means that the Name and SSHKey options are supported for the User array,
but none of the other fields are supported.
Error messages use the new CustomizationError type to print the path to
the specific option that caused the error.
A validation function that takes a list of required paths to keys and a
blueprint and checks that every value defined in the required list is
set in the blueprint. This validator operates in a reverse manner than
the validateSupportedConfig() function since it needs to iterate over
the list of required keys and check that they are set rather than
iterate over the keys that are set and check that they are supported.
The format of the required options is the same as for supported. For
example, the following value:
Customizations.User.Name
means that the Name field of the each User defined in the Customizations
should be set to a non-empty value.
Non-empty (non-zero) values are only checked for certain types:
Struct, Pointer, Slice, and String
Other types (Int, Bool, etc) can have valid user-specified zero values.
Test specific error messages when testing failure states.
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Year-old branch that I never finished. I remembered it today during a discussion with @supakeen, @mvo5, and @schuellerf. Opening as draft because I don't want it to disappear or forget about it again.