How to migrate from plugins to Terraform 0.13 registry providers

If you are using external community Terraform 0.12 plugin/provider, you should migrate to Terraform 0.13 and use required_providers instead of downloading provider from Github and extracting to ~/.terraform.d/plugins/ folder.

But there will be some circumstances

In Terraform 0.13 you have to define required_providers and use new Hashicorp Registry - in my case "timohirt/hetznerdns" https://registry.terraform.io/providers/timohirt/hetznerdns/latest/docs

terraform {
  required_providers {
    hetznerdns = {
      source = "timohirt/hetznerdns"
      version = "1.0.7"
    }
  }
}

But after terraform init you will end up with error

Initializing provider plugins...
- Using previously-installed timohirt/hetznerdns v1.0.7
- Finding latest version of -/hetznerdns...

Error: Failed to query available provider packages

Could not retrieve the list of available versions for provider -/hetznerdns:
provider registry registry.terraform.io does not have a provider named
registry.terraform.io/-/hetznerdns

You have to replace your old plugin with new provider with this command (replace your provider name with yours)

terraform state replace-provider "registry.terraform.io/-/hetznerdns" timohirt/hetznerdns

Result

Terraform will perform the following actions:

  ~ Updating provider:
    - registry.terraform.io/-/hetznerdns
    + registry.terraform.io/timohirt/hetznerdns

Changing 20 resources:

  module.recepty_eu_records.hetznerdns_record.gsuite_docs
  module.recepty_eu_records.hetznerdns_record.mxalt4
  module.recepty_eu_records.hetznerdns_record.root6
  module.recepty_eu_records.hetznerdns_record.mx
  module.recepty_eu_records.hetznerdns_record.mxalt2
  module.recepty_eu_records.hetznerdns_record.txtbrave
  module.recepty_eu_records.hetznerdns_record.acmechallenge
  module.recepty_eu_records.hetznerdns_record.txtgoogle
  module.recepty_eu_records.hetznerdns_record.txtspf
  module.recepty_eu_records.hetznerdns_record.all
  module.recepty_eu_records.hetznerdns_record.txtdkim
  module.recepty_eu_records.hetznerdns_record.gsuite_calendar
  module.recepty_eu_records.hetznerdns_record.bingsiteverification
  module.recepty_eu_records.hetznerdns_record.root
  module.recepty_eu_records.hetznerdns_zone.zone1
  module.recepty_eu_records.hetznerdns_record.www
  module.recepty_eu_records.hetznerdns_record.gsuite_mail
  module.recepty_eu_records.hetznerdns_record.mxalt3
  module.recepty_eu_records.hetznerdns_record.txtdmarc
  module.recepty_eu_records.hetznerdns_record.mxalt1


Do you want to make these changes?
Only 'yes' will be accepted to continue.

Enter a value: yes

Successfully replaced provider for 20 resources.