terraform

Commit Graph

Author	SHA1	Message	Date
Martin Atkins	1879a39d2d	configs: Refined error messages for mismatched provider passing This set of diagnostic messages is under a number of unusual constraints that make them tough to get right: - They are discussing a couple finicky concepts which authors are likely to be encountering for the first time in these error messages: the idea of "local names" for providers, the relationship between those and provider source addresses, and additional ("aliased") provider configurations. - They are reporting concerns that span across a module call boundary, and so need to take care to be clear about whether they are talking about a problem in the caller or a problem in the callee. - Some of them are effectively deprecation warnings for features that might be in use by a third-party module that the user doesn't control, in which case they have no recourse to address them aside from opening a feature request with the upstream module maintainer. - Terraform has, for backward-compatibility reasons, a lot of implied default behaviors regarding providers and provider configurations, and these errors can arise in situations where Terraform's assumptions don't match the author's intent, and so we need to be careful to explain what Terraform assumed in order to make the messages understandable. After seeing some confusion with these messages in the community, and being somewhat confused by some of them myself, I decided to try to edit them a bit for consistency of terminology (both between the messages and with terminology in our docs), being explicit about caller vs. callee by naming them in the messages, and making explicit what would otherwise be implicit with regard to the correspondences between provider source addresses and local names. My assumed audience for all of these messages is the author of the caller module, because it's the caller who is responsible for creating the relationship between caller and callee. As much as possible I tried to make the messages include specific actions for that author to take to quiet the warning or fix the error, but some of the warnings are only fixable by the callee's maintainer and so those messages are, in effect, a suggestion to send a request to the author to stop using a deprecated feature. I think these new messages are also not ideal by any means, because it's just tough to pack so much information into concise messages while being clear and consistent, but I hope at least this will give users seeing these messages enough context to infer what's going on, possibly with the help of our documentation. I intentionally didn't change which cases Terraform will return warnings or errors -- only the message texts -- although I did highlight in a comment in one of the tests that what it is a asserting seems a bit suspicious to me. I don't intend to address that here; instead, I intend that note to be something to refer to if we later see a bug report that calls that behavior into question. This does actually silence some _unrelated_ warnings and errors in cases where a provider block has an invalid provider local name as its label, because our other functions for dealing with provider addresses are written to panic if given invalid addresses under the assumption that earlier code will have guarded against that. Doing this allowed for the provider configuration validation logic to safely include more information about the configuration as helpful context, without risking tripping over known-invalid configuration and panicking in the process.	4 years ago
James Bardin	0771a214d8	skip provider resolution when there are errors If there are errors loading the configuration, don't try to resolve the provider names, as those names may not even be valid.	4 years ago
Martin Atkins	31349a9c3a	Move configs/ to internal/configs/ This is part of a general effort to move all of Terraform's non-library package surface under internal in order to reinforce that these are for internal use within Terraform only. If you were previously importing packages under this prefix into an external codebase, you could pin to an earlier release tag as an interim solution until you've make a plan to achieve the same functionality some other way.	5 years ago

Author

SHA1

Message

Date

Martin Atkins

1879a39d2d

configs: Refined error messages for mismatched provider passing

This set of diagnostic messages is under a number of unusual constraints
that make them tough to get right:
 - They are discussing a couple finicky concepts which authors are
   likely to be encountering for the first time in these error messages:
   the idea of "local names" for providers, the relationship between those
   and provider source addresses, and additional ("aliased") provider
   configurations.
 - They are reporting concerns that span across a module call boundary,
   and so need to take care to be clear about whether they are talking
   about a problem in the caller or a problem in the callee.
 - Some of them are effectively deprecation warnings for features that
   might be in use by a third-party module that the user doesn't control,
   in which case they have no recourse to address them aside from opening
   a feature request with the upstream module maintainer.
 - Terraform has, for backward-compatibility reasons, a lot of implied
   default behaviors regarding providers and provider configurations,
   and these errors can arise in situations where Terraform's assumptions
   don't match the author's intent, and so we need to be careful to
   explain what Terraform assumed in order to make the messages
   understandable.

After seeing some confusion with these messages in the community, and
being somewhat confused by some of them myself, I decided to try to edit
them a bit for consistency of terminology (both between the messages and
with terminology in our docs), being explicit about caller vs. callee
by naming them in the messages, and making explicit what would otherwise
be implicit with regard to the correspondences between provider source
addresses and local names.

My assumed audience for all of these messages is the author of the caller
module, because it's the caller who is responsible for creating the
relationship between caller and callee. As much as possible I tried to
make the messages include specific actions for that author to take to
quiet the warning or fix the error, but some of the warnings are only
fixable by the callee's maintainer and so those messages are, in effect,
a suggestion to send a request to the author to stop using a deprecated
feature.

I think these new messages are also not ideal by any means, because it's
just tough to pack so much information into concise messages while being
clear and consistent, but I hope at least this will give users seeing
these messages enough context to infer what's going on, possibly with the
help of our documentation.

I intentionally didn't change which cases Terraform will return warnings
or errors -- only the message texts -- although I did highlight in a
comment in one of the tests that what it is a asserting seems a bit
suspicious to me. I don't intend to address that here; instead, I intend
that note to be something to refer to if we later see a bug report that
calls that behavior into question.

This does actually silence some _unrelated_ warnings and errors in cases
where a provider block has an invalid provider local name as its label,
because our other functions for dealing with provider addresses are
written to panic if given invalid addresses under the assumption that
earlier code will have guarded against that. Doing this allowed for the
provider configuration validation logic to safely include more information
about the configuration as helpful context, without risking tripping over
known-invalid configuration and panicking in the process.

James Bardin

0771a214d8

skip provider resolution when there are errors

If there are errors loading the configuration, don't try to resolve the
provider names, as those names may not even be valid.

Martin Atkins

31349a9c3a

Move configs/ to internal/configs/

This is part of a general effort to move all of Terraform's non-library
package surface under internal in order to reinforce that these are for
internal use within Terraform only.

If you were previously importing packages under this prefix into an
external codebase, you could pin to an earlier release tag as an interim
solution until you've make a plan to achieve the same functionality some
other way.

3 Commits (4835deddaef450198bba00a50311f2ada6f79b96)