failure-provider.txt

$ cat > main.tf
provider "null" {
    version = "2.1.1"
}
^D
$ terraform init

Initializing the backend...

Initializing provider plugins...
- Finding hashicorp/null versions matching "2.1.1"...
- Installing hashicorp/null v2.1.1...
- Installed hashicorp/null v2.1.1 (signed by HashiCorp)

Terraform has been successfully initialized!

You may now begin working with Terraform. Try running "terraform plan" to see
any changes that are required for your infrastructure. All Terraform commands
should now work.

If you ever set or change modules or backend configuration for Terraform,
rerun this command to reinitialize your working directory. If you forget, other
commands will detect it and remind you to do so if necessary.

$ cat > main.tf
provider "null" {
    version = "9.9.9"
}
^D

$ terraform apply -auto-approve
Apply complete! Resources: 0 added, 0 changed, 0 destroyed.

$ terraform -version
Terraform v0.13.0
+ provider registry.terraform.io/hashicorp/null v2.1.1

success-module.txt

$ mkdir v{1,2}
$ touch v{1,2}/main.tf
$ cat > main.tf
module "test" {
    source = "./v1"
}
^D
$ terraform init
Initializing modules...
- test in v1

Initializing the backend...

Initializing provider plugins...

Terraform has been successfully initialized!

You may now begin working with Terraform. Try running "terraform plan" to see
any changes that are required for your infrastructure. All Terraform commands
should now work.

If you ever set or change modules or backend configuration for Terraform,
rerun this command to reinitialize your working directory. If you forget, other
commands will detect it and remind you to do so if necessary.

$ cat > main.tf
module "test" {
    source = "./v2"
}
^D
$ terraform apply -auto-approve

Error: Module source has changed

  on main.tf line 2, in module "test":
   2:     source = "./v2"

The source address was changed since this module was installed. Run "terraform
init" to install all modules required by this configuration.
$ terraform init
Initializing modules...
- test in v2

Initializing the backend...

Initializing provider plugins...

Terraform has been successfully initialized!

You may now begin working with Terraform. Try running "terraform plan" to see
any changes that are required for your infrastructure. All Terraform commands
should now work.

If you ever set or change modules or backend configuration for Terraform,
rerun this command to reinitialize your working directory. If you forget, other
commands will detect it and remind you to do so if necessary.
$ terraform --version
Terraform v0.13.0

success-provider.txt

$ cat > main.tf
provider "null" {
    version = "2.1.1"
}
^D
$ terraform init

Initializing the backend...

Initializing provider plugins...
- Checking for available provider plugins...
- Downloading plugin for provider "null" (hashicorp/null) 2.1.1...

Terraform has been successfully initialized!

You may now begin working with Terraform. Try running "terraform plan" to see
any changes that are required for your infrastructure. All Terraform commands
should now work.

If you ever set or change modules or backend configuration for Terraform,
rerun this command to reinitialize your working directory. If you forget, other
commands will detect it and remind you to do so if necessary.
$ cat > main.tf
provider "null" {
    version = "9.9.9"
}
^D
$ terraform apply -auto-approve

Error: Could not satisfy plugin requirements


Plugin reinitialization required. Please run "terraform init".

Plugins are external binaries that Terraform uses to access and manipulate
resources. The configuration provided requires plugins which can't be located,
don't satisfy the version constraints, or are otherwise incompatible.

Terraform automatically discovers provider requirements from your
configuration, including providers used in child modules. To see the
requirements and constraints from each module, run "terraform providers".



Error: provider.null: no suitable version installed
  version requirements: "9.9.9"
  versions installed: "2.1.1"


$ terraform --version
Terraform v0.12.28
+ provider.null v2.1.1