How to validate a field that depends on other fields to catch problems during plan?

[Ashish Thakur]

Basically I want to get the terraform plan to find issues early on. I have two fields A and B. A can have certain values based on what B is holding at a point.

So if someones specifies these two fields in the schema, how can I leverage validateFunc (or otherwise)to put proper validation so that problem is found at plan stage itself.

For example if B is true A could be 1,2,3,4 and if B is false A could be 8,9.

[Paddy Carver]

Unfortunately, this isn't something that the provider framework supports just yet, but it is something that the core team discusses and knows is an issue. I don't have a timeline for resolution, but it's definitely a known limitation. Sorry I can't offer more here.

Best,

Paddy

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[Ashish Thakur]

Thanks for the information Paddy. While I am on the topic of validation, I would like some confirmation on whether only validations on static information can be achieved during terraform plan. For example while ordering something on some cloud services some chosen data centers  by the user in the schema could be at capacity for a particular resource and hence no more resources of a particular kind can be provisioned. Can this type of issues be caught at plan time?

Regards
Ashish

On Saturday, 7 October 2017 04:59:34 UTC+5:30, Paddy Carver wrote:

Unfortunately, this isn't something that the provider framework supports just yet, but it is something that the core team discusses and knows is an issue. I don't have a timeline for resolution, but it's definitely a known limitation. Sorry I can't offer more here.

Best,

Paddy

On Fri, Oct 6, 2017 at 11:28 AM, Ashish Thakur <ashis...@gmail.com> wrote:

Basically I want to get the terraform plan to find issues early on. I have two fields A and B. A can have certain values based on what B is holding at a point.

So if someones specifies these two fields in the schema, how can I leverage validateFunc (or otherwise)to put proper validation so that problem is found at plan stage itself.

For example if B is true A could be 1,2,3,4 and if B is false A could be 8,9.

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[Paddy Carver]

Hi Ashish,

So this is a slightly complicated question. Technically, right now, the `terraform validate` command is what's doing the validation; it's just run as part of `terraform plan`, as well. And from what I understand, there are no plans to allow network access to the functions run as part of that, as the intention is to allow e.g. editors to run it inline. I do know, however, that the team is aware that network-accessible validation, as well as validation across fields, are things that would be really useful and are discussing the possibility of future improvements. I can't promise a timeline, or even that it will happen, but they're things we're aware of.

Cheers,

Paddy

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