Local Terraform Init Without Downloading Providers

local-init.sh

#!/bin/bash

# Define providers as name/version pairs
architecture="darwin_arm64"
providers=(
    "random/3.7.2"
    "aws/5.30.0"
    "azurerm/3.80.0"
)

# Clean up in case things were run before
unset TF_PLUGIN_CACHE_DIR
rm -rf .terraform .terraform.lock.hcl terraform.rc mirror

LOCAL_PLUGIN_DIR="$(pwd)/mirror"

# Loop over providers place dummy files
for provider in "${providers[@]}"; do
    name="${provider%%/*}"
    version="${provider##*/}"

    provider_dir="${LOCAL_PLUGIN_DIR}/registry.terraform.io/hashicorp/${name}/${version}/${architecture}"
    mkdir -p "${provider_dir}"
    touch "${provider_dir}/terraform-provider-${name}_v${version}_x5"
done

terraform init -plugin-dir "${LOCAL_PLUGIN_DIR}"

# Remove the lock file
rm .terraform.lock.hcl

# Output of running this script:
# ./local-init.sh
# Initializing the backend...
# Initializing provider plugins...
# - Finding hashicorp/random versions matching "3.7.2"...
# - Finding hashicorp/aws versions matching "5.30.0"...
# - Installing hashicorp/random v3.7.2...
# - Installed hashicorp/random v3.7.2 (unauthenticated)
# - Installing hashicorp/aws v5.30.0...
# - Installed hashicorp/aws v5.30.0 (unauthenticated)
# Terraform has created a lock file .terraform.lock.hcl to record the provider
# selections it made above. Include this file in your version control repository
# so that Terraform can guarantee to make the same selections by default when
# you run "terraform init" in the future.
#
# ╷
# │ Warning: Incomplete lock file information for providers
# │ 
# │ Due to your customized provider installation methods, Terraform was forced to calculate
# │ lock file checksums locally for the following providers:
# │   - hashicorp/aws
# │   - hashicorp/random
# │ 
# │ The current .terraform.lock.hcl file only includes checksums for darwin_arm64, so Terraform
# │ running on another platform will fail to install these providers.
# │ 
# │ To calculate additional checksums for another platform, run:
# │   terraform providers lock -platform=linux_amd64
# │ (where linux_amd64 is the platform to generate)
# ╵
# 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.