Merge #11341

11341: Add tfconvert to pulumi convert r=Frassle a=Frassle

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# Description

<!--- Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. -->

This adds tfconvert to `pulumi convert`, inline with the intention that all conversions will be mediated by the CLI/engine.

There are two reasons for adding other conversion systems to pulumi convert:
1. It means only the engine needs to worry about calling into all the language code generators, tfconvert now just has to concern itself with returning PCL output.
2. It means only the engine needs to worry about plugin and schema loading, tfconvert now just gets an interface passed to it for accessing schemas.

The longer term intention is that we shouldn't have a direct build link to tfconvert here, but instead "pluginify" converters in some way. Hopefully yaml, terraform, arm, helm, etc could all be handled by individual plugins.

With that in mind, we should name this such that it fits into our plugin system. I've currently set the `--from` argument as "terraform" but we probably don't want to use that as a plugin name because that would map to github.com/pulumi/pulumi-terraform which already exists and is a provider for terraform state.

I think we _probably_ want to go with "hcl", but open to other suggestions.

## Checklist

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- [ ] I have added tests that prove my fix is effective or that my feature works
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User-facing changes require a CHANGELOG entry.
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- [x] I have run `make changelog` and committed the `changelog/pending/<file>` documenting my change
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then the service should honor older versions of the CLI where this change would not exist.
You must then bump the API version in /pkg/backend/httpstate/client/api.go, as well as add
it to the service.
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- [ ] Yes, there are changes in this PR that warrants bumping the Pulumi Service API version
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Co-authored-by: Fraser Waters <fraser@pulumi.com>

changelog/pending/20221114--cli--added-from-terraform-to-pulumi-convert.yaml

@@ -0,0 +1,4 @@
+changes:
+- type: feat
+  scope: cli
+  description: Added "--from=tf" to pulumi convert.

pkg/cmd/pulumi/convert.go

@@ -25,6 +25,7 @@ import (
 	"github.com/spf13/cobra"
 
 	javagen "github.com/pulumi/pulumi-java/pkg/codegen/java"
+	tfgen "github.com/pulumi/pulumi-terraform-bridge/v3/pkg/tf2pulumi/convert"
 	yamlgen "github.com/pulumi/pulumi-yaml/pkg/pulumiyaml/codegen"
 	"github.com/pulumi/pulumi/pkg/v3/codegen/dotnet"
 	gogen "github.com/pulumi/pulumi/pkg/v3/codegen/go"
@@ -209,6 +210,11 @@ func runConvert(cwd string, from string, language string, outDir string, generat
 		} else {
 			return result.FromError(fmt.Errorf("unrecognized source %s", from))
 		}
+	} else if from == "tf" {
+		proj, program, err = tfgen.Eject(cwd, loader)
+		if err != nil {
+			return result.FromError(fmt.Errorf("could not load terraform program: %w", err))
+		}
 	} else {
 		return result.FromError(fmt.Errorf("unrecognized source %s", from))
 	}

pkg/go.mod

@@ -29,7 +29,7 @@ require (
 	github.com/hashicorp/hcl/v2 v2.14.0
 	github.com/iancoleman/strcase v0.2.0
 	github.com/ijc/Gotty v0.0.0-20170406111628-a8b993ba6abd
-	github.com/mitchellh/copystructure v1.0.0
+	github.com/mitchellh/copystructure v1.2.0
 	github.com/moby/moby v20.10.18+incompatible
 	github.com/moby/term v0.0.0-20210619224110-3f7ff695adc6
 	github.com/mxschmitt/golang-combinations v1.0.0
@@ -68,6 +68,7 @@ require (
 	github.com/muesli/cancelreader v0.2.2
 	github.com/natefinch/atomic v1.0.1
 	github.com/pulumi/pulumi-java/pkg v0.6.0
+	github.com/pulumi/pulumi-terraform-bridge/v3 v3.33.1-0.20221104131001-330791e758b8
 	github.com/pulumi/pulumi-yaml v1.0.2
 	github.com/rivo/uniseg v0.2.0
 	github.com/segmentio/encoding v0.3.5
@@ -97,13 +98,18 @@ require (
 	github.com/Azure/go-autorest/logger v0.2.1 // indirect
 	github.com/Azure/go-autorest/tracing v0.6.0 // indirect
 	github.com/AzureAD/microsoft-authentication-library-for-go v0.4.0 // indirect
+	github.com/Masterminds/goutils v1.1.0 // indirect
+	github.com/Masterminds/semver v1.5.0 // indirect
+	github.com/Masterminds/sprig v2.22.0+incompatible // indirect
 	github.com/Microsoft/go-winio v0.5.2 // indirect
 	github.com/Netflix/go-expect v0.0.0-20220104043353-73e0943537d2 // indirect
 	github.com/ProtonMail/go-crypto v0.0.0-20210428141323-04723f9f07d7 // indirect
 	github.com/acomagu/bufpipe v1.0.3 // indirect
 	github.com/aead/chacha20 v0.0.0-20180709150244-8b13a72661da // indirect
 	github.com/agext/levenshtein v1.2.3 // indirect
+	github.com/apparentlymart/go-cidr v1.1.0 // indirect
 	github.com/apparentlymart/go-textseg/v13 v13.0.0 // indirect
+	github.com/armon/go-radix v1.0.0 // indirect
 	github.com/aws/aws-sdk-go-v2 v1.16.8 // indirect
 	github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.4.3 // indirect
 	github.com/aws/aws-sdk-go-v2/config v1.15.15 // indirect
@@ -123,13 +129,16 @@ require (
 	github.com/aws/aws-sdk-go-v2/service/sso v1.11.13 // indirect
 	github.com/aws/aws-sdk-go-v2/service/sts v1.16.10 // indirect
 	github.com/aws/smithy-go v1.12.0 // indirect
+	github.com/bgentry/go-netrc v0.0.0-20140422174119-9fd32a8b3d3d // indirect
+	github.com/bgentry/speakeasy v0.1.0 // indirect
 	github.com/cenkalti/backoff/v3 v3.2.2 // indirect
 	github.com/cheggaaa/pb v1.0.29 // indirect
 	github.com/cpuguy83/go-md2man/v2 v2.0.2 // indirect
 	github.com/creack/pty v1.1.17 // indirect
 	github.com/dimchansky/utfbom v1.1.1 // indirect
 	github.com/emirpasic/gods v1.12.0 // indirect
 	github.com/ettle/strcase v0.1.1 // indirect
+	github.com/fatih/color v1.13.0 // indirect
 	github.com/go-git/gcfg v1.5.0 // indirect
 	github.com/go-git/go-billy/v5 v5.3.1 // indirect
 	github.com/go-ole/go-ole v1.2.6 // indirect
@@ -146,36 +155,52 @@ require (
 	github.com/googleapis/gax-go/v2 v2.4.0 // indirect
 	github.com/hashicorp/errwrap v1.1.0 // indirect
 	github.com/hashicorp/go-cleanhttp v0.5.2 // indirect
+	github.com/hashicorp/go-cty v1.4.1-0.20200414143053-d3edf31b6320 // indirect
+	github.com/hashicorp/go-getter v1.6.1 // indirect
 	github.com/hashicorp/go-retryablehttp v0.7.1 // indirect
 	github.com/hashicorp/go-rootcerts v1.0.2 // indirect
+	github.com/hashicorp/go-safetemp v1.0.0 // indirect
 	github.com/hashicorp/go-sockaddr v1.0.2 // indirect
+	github.com/hashicorp/go-uuid v1.0.3 // indirect
+	github.com/hashicorp/go-version v1.6.0 // indirect
 	github.com/hashicorp/hcl v1.0.0 // indirect
+	github.com/hashicorp/hil v0.0.0-20190212132231-97b3a9cdfa93 // indirect
+	github.com/hashicorp/terraform-svchost v0.0.0-20200729002733-f050f53b9734 // indirect
 	github.com/hashicorp/vault/api v1.1.1 // indirect
 	github.com/hashicorp/vault/sdk v0.2.1 // indirect
 	github.com/hinshun/vt10x v0.0.0-20220119200601-820417d04eec // indirect
+	github.com/huandu/xstrings v1.3.2 // indirect
 	github.com/imdario/mergo v0.3.12 // indirect
 	github.com/inconshreveable/mousetrap v1.0.0 // indirect
 	github.com/jbenet/go-context v0.0.0-20150711004518-d14ea06fba99 // indirect
 	github.com/jmespath/go-jmespath v0.4.0 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
 	github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51 // indirect
 	github.com/kevinburke/ssh_config v1.1.0 // indirect
+	github.com/klauspost/compress v1.15.1 // indirect
 	github.com/kylelemons/godebug v1.1.0 // indirect
 	github.com/lufia/plan9stats v0.0.0-20211012122336-39d0f177ccd0 // indirect
 	github.com/mattn/go-colorable v0.1.12 // indirect
 	github.com/mattn/go-isatty v0.0.14 // indirect
 	github.com/mattn/go-runewidth v0.0.13 // indirect
 	github.com/mgutz/ansi v0.0.0-20170206155736-9520e82c474b // indirect
+	github.com/mitchellh/cli v1.1.2 // indirect
 	github.com/mitchellh/go-homedir v1.1.0 // indirect
 	github.com/mitchellh/go-ps v1.0.0 // indirect
+	github.com/mitchellh/go-testing-interface v1.14.1 // indirect
 	github.com/mitchellh/go-wordwrap v1.0.1 // indirect
-	github.com/mitchellh/mapstructure v1.4.3 // indirect
-	github.com/mitchellh/reflectwalk v1.0.0 // indirect
+	github.com/mitchellh/hashstructure v1.0.0 // indirect
+	github.com/mitchellh/mapstructure v1.5.0 // indirect
+	github.com/mitchellh/reflectwalk v1.0.2 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
 	github.com/opentracing/basictracer-go v1.1.0 // indirect
 	github.com/pierrec/lz4 v2.6.1+incompatible // indirect
 	github.com/pkg/browser v0.0.0-20210115035449-ce105d075bb4 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pkg/term v1.1.0 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/posener/complete v1.2.3 // indirect
 	github.com/power-devops/perfstat v0.0.0-20210106213030-5aafc221ea8c // indirect
 	github.com/rogpeppe/go-internal v1.8.1 // indirect
 	github.com/russross/blackfriday/v2 v2.1.0 // indirect
@@ -184,12 +209,14 @@ require (
 	github.com/segmentio/asm v1.1.3 // indirect
 	github.com/shurcooL/httpfs v0.0.0-20190707220628-8d4bc4ba7749 // indirect
 	github.com/shurcooL/vfsgen v0.0.0-20200824052919-0d455de96546 // indirect
+	github.com/spf13/afero v1.6.0 // indirect
 	github.com/spf13/cast v1.4.1 // indirect
 	github.com/texttheater/golang-levenshtein v1.0.1 // indirect
 	github.com/tklauser/go-sysconf v0.3.10 // indirect
 	github.com/tklauser/numcpus v0.4.0 // indirect
 	github.com/uber/jaeger-client-go v2.30.0+incompatible // indirect
 	github.com/uber/jaeger-lib v2.4.1+incompatible // indirect
+	github.com/ulikunitz/xz v0.5.8 // indirect
 	github.com/xanzy/ssh-agent v0.3.2 // indirect
 	github.com/xeipuuv/gojsonpointer v0.0.0-20180127040702-4e3ac2762d5f // indirect
 	github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415 // indirect