Seeing "The filename or extension is too long" when "terragrunt plan" is executed in Windows

Question

Executing "terragrunt plan" from Visual Studio code gives the below error in Windows 10:

Running command: terraform init -backend-config=region=eu-west-2 -backend-config=bucket=bucket-name" -backend-config=dynamodb_table=lock-table -backend-config=encrypt=true -backend-config=key=ec2/terraform.tfstate

Initializing the backend...

Successfully configured the backend "s3"! Terraform will automatically use this backend unless the backend configuration changes.

Initializing provider plugins...

• Finding hashicorp/aws versions matching "~> 3.36.0"...
• Installing hashicorp/aws v3.36.0...

Error: Failed to install provider

Error while installing hashicorp/aws v3.36.0: mkdir .terraform/plugins/registry.terraform.io/hashicorp/aws/3.36.0/windows_amd64: The filename or extension is too long.

[terragrunt] 2021/05/19 15:39:20 Hit multiple errors: exit status 1

Answer 1

The proper fix is here:

1. Start Git Bash as Administrator
2. Run command git config --system core.longpaths true

How to fix "Filename too long error" during git clone

Answer 2

Thanks Rubens for suggesting using TERRAGRUNT_DOWNLOAD environment variable. I'm able to work around this problem.

Here are the complete steps in terragrunt:

1. from cmd, set TERRAGRUNT_DOWNLOAD and call init:

set TERRAGRUNT_DOWNLOAD=C:\\.terragrunt-cache

terragrunt init

2. Then copy or move C:\\.terragrunt-cache content to the .terragrunt-cache in my project (better clean up the folder first)

3. from cmd, unset TERRAGRUNT_DOWNLOAD and call apply

set TERRAGRUNT_DOWNLOAD=

terragrunt apply