CustomDiffInSequence returns a CustomizeDiffFunc that runs all of the given CustomizeDiffFuncs in sequence, stopping at the first one that returns an error and returning that error.

CustomDiffWithAll returns a CustomizeDiffFunc that runs all of the given CustomizeDiffFuncs and returns all of the errors produced.

CustomizeDiffShim is a shim around the Terraform Plugin SDK which allows us to switch out the version of the Plugin SDK being used without breaking open PR's.

DiagErrorf is a wrapper around the DiagErrorf function in the Plugin SDK diag package.

DiagFromErr is a wrapper around the DiagFromErr function in the Plugin SDK diag package.

EnvDefaultFunc is a helper function that returns the value of the given environment variable, if one exists, or the default value otherwise.

ForceNewIf returns a CustomizeDiffFunc that flags the given key as requiring a new resource if the given condition function returns true.

ForceNewIfChange returns a CustomizeDiffFunc that flags the given key as requiring a new resource if the given condition function returns true.

HashResource hashes complex structures that are described using a *Resource.

HashString hashes strings.

ImporterValidatingResourceId validates the ID provided at import time is valid using the validateFunc.

ImporterValidatingResourceIdThen validates the ID provided at import time is valid using the validateFunc then runs the 'thenFunc', allowing the import to be customised.

IsExplicitlyNullInConfig determines whether the specified 'configFieldName' exists in the configuration file or not.

MultiEnvDefaultFunc is a helper function that returns the value of the first environment variable in the given list that returns a non-empty value.

NewSet is a convenience method for creating a new set with the given items.

NonRetryableError is a helper to create a RetryError that's _not_ retryable from a given error.

Retry is a basic wrapper around StateChangeConf that will just retry a function until it no longer returns an error.

RetryableError is a helper to create a RetryError that's retryable from a given error.

StateUpgrades is a wrapper around the Plugin SDK's State Upgraders which allows us to upgrade the Plugin SDK without breaking all open PR's and attempts to make this interface a little less verbose.

ValueChangeConditionShim is a shim around the Terraform Plugin SDK which allows us to switch out the version of the Plugin SDK being used without breaking open PR's.

ValueIsNotEmptyOrUnknown returns false if provided a blank string or a string that looks "unknown".

PluginSdkUnknownValue is a dummy value used/sent by the plugin SDK when a real value is not known at plan time, e.g.

RetryError is the required return type of RetryFunc.

RetryFunc is the function retried until it succeeds.