Cannot convert terraform for kube config on hetzner cloud

[emiliauskas-fuzzy]

What happened?

I wanted to convert following script https://github.com/kube-hetzner/terraform-hcloud-kube-hetzner - to pulumi

but getting error:

panic: fatal: A failure has occurred: Couldn't convert expression: *hclsyntax.TemplateJoinExpr

goroutine 53 [running]:

github.com/pulumi/pulumi/sdk/v3/go/common/util/contract.failfast(...)

	/Users/runner/go/pkg/mod/github.com/pulumi/pulumi/sdk/[email protected]/go/common/util/contract/failfast.go:23

github.com/pulumi/pulumi/sdk/v3/go/common/util/contract.Failf({0x1870640?, 0xc0002ab620?}, {0xc000e2ea78?, 0x40f1ff?, 0x165f0c0?})

	/Users/runner/go/pkg/mod/github.com/pulumi/pulumi/sdk/[email protected]/go/common/util/contract/fail.go:32 +0xcb

github.com/pulumi/pulumi-converter-terraform/pkg/convert.convertExpression(0x2b66dc0?, 0x0?, 0x2?, {0x0?, 0x15c0340?}, {0x1ea7c18?, 0xc000910940?})

	/Users/runner/work/pulumi-converter-terraform/pulumi-converter-terraform/pkg/convert/tf.go:1629 +0x313

github.com/pulumi/pulumi-converter-terraform/pkg/convert.convertTemplateExpr(0xc000e2fdc8, 0xc000738d80, {0xc000e2ebd8?, 0x40f1ff?}, 0xc000bf7ce0)

	/Users/runner/work/pulumi-converter-terraform/pulumi-converter-terraform/pkg/convert/tf.go:1098 +0x4ba

github.com/pulumi/pulumi-converter-terraform/pkg/convert.convertExpression(0x2b66f80?, 0x20?, 0x10?, {0x0?, 0x41a0d8?}, {0x1ea77b0?, 0xc000bf7ce0?})

	/Users/runner/work/pulumi-converter-terraform/pulumi-converter-terraform/pkg/convert/tf.go:1605 +0x297

github.com/pulumi/pulumi-converter-terraform/pkg/convert.convertConditionalExpr(0xc000e2fdc8, 0x0, 0xc000738d80, {0x40f1ff?, 0x165f0c0?}, 0xc0004ffa40)

	/Users/runner/work/pulumi-converter-terraform/pulumi-converter-terraform/pkg/convert/tf.go:1565 +0xc5

github.com/pulumi/pulumi-converter-terraform/pkg/convert.convertExpression(0x2b66dc0?, 0x40?, 0x2?, {0x0?, 0x15c0340?}, {0x1ea7970?, 0xc0004ffa40?})

	/Users/runner/work/pulumi-converter-terraform/pulumi-converter-terraform/pkg/convert/tf.go:1625 +0x1d9

github.com/pulumi/pulumi-converter-terraform/pkg/convert.convertTemplateExpr(0xc000e2fdc8, 0xc000738d80, {0xc000e2ee58?, 0x40f1ff?}, 0xc000bf7e00)

	/Users/runner/work/pulumi-converter-terraform/pulumi-converter-terraform/pkg/convert/tf.go:1098 +0x4ba

github.com/pulumi/pulumi-converter-terraform/pkg/convert.convertExpression(0x2b66fa0?, 0x20?, 0x78fba9e3f5b8?, {0x0?, 0x1e?}, {0x1ea77b0?, 0xc000bf7e00?})

	/Users/runner/work/pulumi-converter-terraform/pulumi-converter-terraform/pkg/convert/tf.go:1605 +0x297

github.com/pulumi/pulumi-converter-terraform/pkg/convert.convertConditionalExpr(0xc000e2fdc8, 0x1, 0xc000738d80, {0xc000e2ef68?, 0x3?}, 0xc0004ffab0)

	/Users/runner/work/pulumi-converter-terraform/pulumi-converter-terraform/pkg/convert/tf.go:1566 +0x125

github.com/pulumi/pulumi-converter-terraform/pkg/convert.convertExpression(0x15d5b20?, 0x10?, 0xc000e2efe8?, {0x0?, 0xc000e2f018?}, {0x1ea7970?, 0xc0004ffab0?})

	/Users/runner/work/pulumi-converter-terraform/pulumi-converter-terraform/pkg/convert/tf.go:1625 +0x1d9

github.com/pulumi/pulumi-converter-terraform/pkg/convert.convertLocal(0xc000e2fdc8, 0xc000738d80, 0xc000f908a0)

	/Users/runner/work/pulumi-converter-terraform/pulumi-converter-terraform/pkg/convert/tf.go:2039 +0xbd

github.com/pulumi/pulumi-converter-terraform/pkg/convert.translateModuleSourceCode(0xc000e31610, {0x1eb8260, 0xc000b5a040}, {0x1e8baac, 0x1}, {0x1eb8260, 0xc000a1a500}, {0xc000b2e3a8, 0x14}, {0x1e91180, ...})

	/Users/runner/work/pulumi-converter-terraform/pulumi-converter-terraform/pkg/convert/tf.go:3027 +0x335e

github.com/pulumi/pulumi-converter-terraform/pkg/convert.translateRemoteModule(0xc000c2f610, {0xc000a37490, 0x6f}, {0x0, 0x0}, {0x1eb8260, 0xc000a1a500}, {0xc000b2e3a8, 0x14}, {0x1e91180, ...})

	/Users/runner/work/pulumi-converter-terraform/pulumi-converter-terraform/pkg/convert/tf.go:2524 +0x53a

github.com/pulumi/pulumi-converter-terraform/pkg/convert.translateModuleSourceCode(0xc000e31610, {0x1eb81e0, 0x2c1c420}, {0xc0005b40f0, 0x4b}, {0x1eb8260, 0xc000a1a500}, {0x1e8baac, 0x1}, {0x1e91180, ...})

	/Users/runner/work/pulumi-converter-terraform/pulumi-converter-terraform/pkg/convert/tf.go:2857 +0x6dc5

github.com/pulumi/pulumi-converter-terraform/pkg/convert.TranslateModule(...)

	/Users/runner/work/pulumi-converter-terraform/pulumi-converter-terraform/pkg/convert/tf.go:3143

main.(*tfConverter).ConvertProgram(0xc000a18cf0?, {0x40e27a?, 0xc0006c16f0?}, 0xc0000a2d80)

	/Users/runner/work/pulumi-converter-terraform/pulumi-converter-terraform/cmd/pulumi-converter-terraform/main.go:149 +0x72b

github.com/pulumi/pulumi/sdk/v3/go/common/resource/plugin.(*converterServer).ConvertProgram(0xc0005cb480, {0x1ea7200, 0xc000a18cf0}, 0xc000a3a280)

	/Users/runner/go/pkg/mod/github.com/pulumi/pulumi/sdk/[email protected]/go/common/resource/plugin/converter_server.go:76 +0x126

github.com/pulumi/pulumi/sdk/v3/proto/go._Converter_ConvertProgram_Handler.func1({0x1ea7200?, 0xc000a18cf0?}, {0x1766660?, 0xc000a3a280?})

	/Users/runner/go/pkg/mod/github.com/pulumi/pulumi/sdk/[email protected]/proto/go/converter_grpc.pb.go:122 +0xcb

github.com/grpc-ecosystem/grpc-opentracing/go/otgrpc.OpenTracingServerInterceptor.func1({0x1ea7200, 0xc000a18930}, {0x1766660, 0xc000a3a280}, 0xc000a1a200, 0xc000972438)

	/Users/runner/go/pkg/mod/github.com/grpc-ecosystem/[email protected]/go/otgrpc/server.go:57 +0x3db

github.com/pulumi/pulumi/sdk/v3/proto/go._Converter_ConvertProgram_Handler({0x1637f80, 0xc0005cb480}, {0x1ea7200, 0xc000a18930}, 0xc000a3a200, 0xc0005cb360)

	/Users/runner/go/pkg/mod/github.com/pulumi/pulumi/sdk/[email protected]/proto/go/converter_grpc.pb.go:124 +0x143

google.golang.org/grpc.(*Server).processUnaryRPC(0xc000563600, {0x1ea7200, 0xc000a188a0}, {0x1eb23a0, 0xc000002180}, 0xc000529320, 0xc00064bb00, 0x2b7f6b8, 0x0)

	/Users/runner/go/pkg/mod/google.golang.org/[email protected]/server.go:1379 +0xdf8

google.golang.org/grpc.(*Server).handleStream(0xc000563600, {0x1eb23a0, 0xc000002180}, 0xc000529320)

	/Users/runner/go/pkg/mod/google.golang.org/[email protected]/server.go:1790 +0xe8b

google.golang.org/grpc.(*Server).serveStreams.func2.1()

	/Users/runner/go/pkg/mod/google.golang.org/[email protected]/server.go:1029 +0x8b

created by google.golang.org/grpc.(*Server).serveStreams.func2 in goroutine 51

	/Users/runner/go/pkg/mod/google.golang.org/[email protected]/server.go:1040 +0x125

error: rpc error: code = Unavailable desc = error reading from server: EOF

Example

command:

pulumi convert --from terraform --language typescript

Using example tf script:

https://github.com/kube-hetzner/terraform-hcloud-kube-hetzner/blob/master/kube.tf.example

Output of pulumi about

CLI
Version 3.136.1
Go Version go1.23.2
Go Compiler gc

Host
OS ubuntu
Version 24.04
Arch x86_64

Backend
Name pulumi.com
URL https://app.pulumi.com/em_stacktome
User em_stacktome
Organizations em_stacktome
Token type personal

Additional context

plugin list:

NAME                 KIND       VERSION  SIZE    INSTALLED      LAST USED
cloudinit            resource   1.4.8    74 MB   2 minutes ago  2 minutes ago
command              resource   0.11.1   35 MB   2 weeks ago    3 days ago
file                 resource   0.0.6    34 MB   2 weeks ago    3 days ago
github               resource   6.3.2    46 MB   2 minutes ago  2 minutes ago
hcloud               resource   1.19.0   45 MB   2 weeks ago    3 days ago
hcloud-kube-hetzner  resource   0.1.0    119 MB  2 weeks ago    3 days ago
kubernetes           resource   4.18.1   212 MB  2 weeks ago    3 days ago
local                resource   0.1.5    74 MB   2 minutes ago  2 minutes ago
null                 resource   0.0.8    74 MB   2 minutes ago  2 minutes ago
random               resource   4.16.7   74 MB   2 minutes ago  2 minutes ago
terraform            converter  1.0.19   42 MB   2 minutes ago  2 minutes ago

Contributing

Vote on this issue by adding a 👍 reaction.
To contribute a fix for this issue, leave a comment (and link to your pull request, if you've opened one already).

[justinvp]

Thanks for opening the issue and sorry for the trouble, @emiliauskas-fuzzy! I'm going to transfer this to the https://github.com/pulumi/pulumi-converter-terraform repo.

Looks like we're not handling *hclsyntax.TemplateJoinExpr in

pulumi-converter-terraform/pkg/convert/tf.go

Line 1657 in 123edef

func convertExpression(state *convertState, inBlock bool, scopes *scopes,

cc: @brandonpollack23, @Zaid-Ajaj

[brandonpollack23]

having a look now :)

[brandonpollack23]

Just submitted a PR that fixes this partially, but it still doesn't convert due to some other issues:

error: placement_groups.pp:0,60-2,2: cannot assign expression of type { input: (0, list(number)) } to location of type   { input: list(number | output(number)) | output(list(number)) | output(list(number)?)? }
| output({ input: list(number)? }): ;
error: control_planes.pp:60,45-48: cannot traverse value of type string;
error: control_planes.pp:61,58-61: cannot traverse value of type string;
error: control_planes.pp:64,49-52: cannot traverse value of type string;
error: control_planes.pp:63,37-66,4: cannot assign expression of type { host: 1, input: list(output(dynamic)) } to location of type   { host: int | output(int) | output(int?)?, input: output(string) | output(string?) | string? }
| output({ host: int?, input: string? }): ;
warning: control_planes.pp:60,27-48: ; Cannot assign value list(output(dynamic)) to attribute of type "integer" for resource "hcloud::LoadBalancerNetwork"
warning: control_planes.pp:61,27-61: ; Cannot assign value list(output(dynamic)) to attribute of type "Optional<string>" for resource "hcloud::LoadBalancerNetwork"
error: control_planes.pp:77,38-41: cannot traverse value of type string;
warning: control_planes.pp:77,20-41: ; Cannot assign value list(output(dynamic)) to attribute of type "integer" for resource "hcloud::LoadBalancerTarget"
error: control_planes.pp:91,39-42: cannot traverse value of type string;
warning: control_planes.pp:91,21-42: ; Cannot assign value list(output(dynamic)) to attribute of type "string" for resource "hcloud::LoadBalancerService"
warning: locals.pp:261,242-256: undefined variable randomPassword;
error: kubeconfig.pp:10,128-131: cannot traverse value of type string;
error: output.pp:29,79-82: cannot traverse value of type string;
error: placement_groups.pp:4,54-6,2: cannot assign expression of type { input: (0, list(number)) } to location of type   { input: list(number | output(number)) | output(list(number)) | output(list(number)?)? }
| output({ input: list(number)? }): ;
error: could not generate output program

The outputted code for the first error:

controlPlanePlacementCompatGroups = invoke("std:index:max", {
  input = [0, [for cpPool in controlPlaneNodepools : cpPool.placementGroupCompatIdx + 1 if cpPool.placementGroupCompatIdx != null && cpPool.placementGroup == null]]
}).result

[brandonpollack23]

After the current fixes linked to this bug are fixed there still remains existing issues:

error: placement_groups.pp:0,60-2,2: cannot assign expression of type { input: (0, list(number)) } to location of type   { input: list(number | output(number)) | output(list(number)) | output(list(number)?)? }
| output({ input: list(number)? }): ;
error: control_planes.pp:60,45-48: cannot traverse value of type string;
error: control_planes.pp:61,58-61: cannot traverse value of type string;
error: control_planes.pp:64,49-52: cannot traverse value of type string;
error: control_planes.pp:63,37-66,4: cannot assign expression of type { host: 1, input: list(output(dynamic)) } to location of type   { host: int | output(int) | output(int?)?, input: output(string) | output(string?) | string? }
| output({ host: int?, input: string? }): ;
warning: control_planes.pp:60,27-48: ; Cannot assign value list(output(dynamic)) to attribute of type "integer" for resource "hcloud::LoadBalancerNetwork"
warning: control_planes.pp:61,27-61: ; Cannot assign value list(output(dynamic)) to attribute of type "Optional<string>" for resource "hcloud::LoadBalancerNetwork"
error: control_planes.pp:77,38-41: cannot traverse value of type string;
warning: control_planes.pp:77,20-41: ; Cannot assign value list(output(dynamic)) to attribute of type "integer" for resource "hcloud::LoadBalancerTarget"
error: control_planes.pp:91,39-42: cannot traverse value of type string;
warning: control_planes.pp:91,21-42: ; Cannot assign value list(output(dynamic)) to attribute of type "string" for resource "hcloud::LoadBalancerService"
warning: locals.pp:278,175-189: undefined variable randomPassword;
error: kubeconfig.pp:10,128-131: cannot traverse value of type string;
error: output.pp:29,79-82: cannot traverse value of type string;
error: placement_groups.pp:4,54-6,2: cannot assign expression of type { input: (0, list(number)) } to location of type   { input: list(number | output(number)) | output(list(number)) | output(list(number)?)? }
| output({ input: list(number)? }): ;
error: could not generate output program