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Martin Atkins 0f936b9d80 plans/planfile: Read state snapshots as part of reading a plan
Our model for plans/planfile has unfortunately grown inconsistent with
changes to our modeling of plans.Plan.

Originally we considered the plan "header" and the planned changes as an
entirely separate artifact from the prior state, but we later realized
that carrying the prior state around with the plan is important to
ensuring we always have enough context to faithfully render a plan to the
user, and so we added the prior state as a field of plans.Plan.
More recently we've also added the "previous run state" to plans.Plan for
similar reasons.

Unfortunately as a result of that modeling drift our ReadPlan method was
silently producing an incomplete plans.Plan object, causing use-cases like
"terraform show" to produce slightly different results due to the
plan object not round-tripping completely.

As a short-term tactical fix, here we add state snapshot reading into the
ReadPlan function. This is not an ideal solution because it means that
in the case of applying a plan, where we really do need access to the
state _file_, we'll end up reading the prior state file twice. However,
the goal here is only to heal the modelling quirk with as little change
as possible, because we're not currently at a point where we'd be willing
to risk regressions from a larger refactoring.
2021-05-10 09:22:47 -07:00
.circleci remove codedov 2021-04-29 13:12:58 -04:00
.github update to match new default branch name (#27909) 2021-02-24 13:36:47 -05:00
addrs Improve ModuleInstance String() performance (#28246) 2021-04-05 08:44:27 -04:00
backend plans: Track both the previous run and prior states in the plan 2021-05-05 15:11:05 -07:00
builtin additional null checks in provisioners 2021-04-20 12:31:32 -04:00
command fixed configloader doesn't add unnecessary diags 2021-05-07 12:28:09 -04:00
communicator Grammar nit: "setup" as a verb should be spelled "set up" 2021-01-26 20:39:11 +01:00
configs don't build a config if it didn't load properly 2021-05-07 11:52:06 -04:00
dag tiny optimisations of dag.Set 2021-04-09 22:59:30 +03:00
docs update destroying doc to show show more CBD detail 2021-03-23 11:21:43 -04:00
e2e command/cliconfig: Allow development overrides for providers 2020-10-16 14:31:15 -07:00
experiments Conclude provider sensitivity experiment 2021-03-10 12:10:26 -05:00
httpclient Merge pull request #22272 from hashicorp/f-httpclient-ua 2019-08-12 20:20:03 +01:00
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internal update getproviders tests for new key 2021-04-23 11:18:58 -04:00
lang functions: Improve marks support for lookup 2021-05-07 12:55:40 -04:00
moduledeps remove LegacyProvider (#26433) 2020-10-05 08:33:49 -04:00
plans plans/planfile: Read state snapshots as part of reading a plan 2021-05-10 09:22:47 -07:00
plugin use WholeContainingBody instead of Sourceless 2021-04-06 15:15:52 -04:00
plugin6 providers.Interface: rename ValidateDataSourceConfig to ValidateDataResourceConfig (#27874) 2021-02-24 12:04:28 -05:00
providers providers.Interface: rename ValidateDataSourceConfig to ValidateDataResourceConfig (#27874) 2021-02-24 12:04:28 -05:00
provisioners provisioners: Add Factory type and FactoryFixed helper 2018-10-16 19:14:11 -07:00
registry registry: staticcheck 2020-12-02 13:59:19 -05:00
repl lang/funcs: add (console-only) TypeFunction (#28501) 2021-04-23 10:29:50 -04:00
scripts Remove revision from version command 2021-01-12 16:35:30 -05:00
states fix ResourceInstanceObject.DeepCopy 2021-03-25 17:39:53 -04:00
terraform core: If we refresh during orphan processing, use the result for planning 2021-05-06 13:26:37 -07:00
tfdiags add addresses to diagnostics 2021-04-06 15:15:52 -04:00
tools terraform-bundle: return an error if "versions" argument is omitted (#28158) 2021-03-22 10:51:03 -04:00
version Cleanup after v0.15.0-alpha20210210 release 2021-02-10 18:00:31 +00:00
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CODEOWNERS Updating codeowners with our deprecated status for tool-specific provisioners 2020-09-29 14:19:56 -04:00
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README.md update to match new default branch name (#27909) 2021-02-24 13:36:47 -05:00
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commands.go command: Experimental "terraform test" command 2021-02-22 14:21:45 -08:00
go.mod go get github.com/zclconf/go-cty@v1.8.3 2021-05-04 17:01:37 -04:00
go.sum go get github.com/zclconf/go-cty@v1.8.3 2021-05-04 17:01:37 -04:00
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provider_source.go Correct the spelling of heirarchy/hierarchy throughout 2021-02-05 15:07:04 +00:00
signal_unix.go Forward SIGTERM and handle that as an interrupt 2016-12-08 12:20:25 -05:00
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README.md

Terraform

Terraform

Terraform is a tool for building, changing, and versioning infrastructure safely and efficiently. Terraform can manage existing and popular service providers as well as custom in-house solutions.

The key features of Terraform are:

  • Infrastructure as Code: Infrastructure is described using a high-level configuration syntax. This allows a blueprint of your datacenter to be versioned and treated as you would any other code. Additionally, infrastructure can be shared and re-used.

  • Execution Plans: Terraform has a "planning" step where it generates an execution plan. The execution plan shows what Terraform will do when you call apply. This lets you avoid any surprises when Terraform manipulates infrastructure.

  • Resource Graph: Terraform builds a graph of all your resources, and parallelizes the creation and modification of any non-dependent resources. Because of this, Terraform builds infrastructure as efficiently as possible, and operators get insight into dependencies in their infrastructure.

  • Change Automation: Complex changesets can be applied to your infrastructure with minimal human interaction. With the previously mentioned execution plan and resource graph, you know exactly what Terraform will change and in what order, avoiding many possible human errors.

For more information, see the introduction section of the Terraform website.

Getting Started & Documentation

Documentation is available on the Terraform website:

If you're new to Terraform and want to get started creating infrastructure, please check out our Getting Started guides on HashiCorp's learning platform. There are also additional guides to continue your learning.

Show off your Terraform knowledge by passing a certification exam. Visit the certification page for information about exams and find study materials on HashiCorp's learning platform.

Developing Terraform

This repository contains only Terraform core, which includes the command line interface and the main graph engine. Providers are implemented as plugins, and Terraform can automatically download providers that are published on the Terraform Registry. HashiCorp develops some providers, and others are developed by other organizations. For more information, see Extending Terraform.

To learn more about compiling Terraform and contributing suggested changes, please refer to the contributing guide.

To learn more about how we handle bug reports, please read the bug triage guide.

License

Mozilla Public License v2.0