Terraform module version pin - search and replace

tf-module-version-pin.sh

#!/bin/bash

# A script to search for all terraform files in a directory and replace
# the source attribute of any module references with a specific git ref tag/commit.
# This is useful for pinning a specific version of a module in a terraform project.
#
# Note:
#  this script was tested on MacOS and may need to be modified for other platforms
#  as the sed command may differ. 
#
# Search pattern:
# match a specific git repository and any top level directory
# with alphanumeric characters, underscores or hyphens in the name, capture the directory name 
pattern='source = "git@github\.com:acme-org/shared-terraform-modules\.git\/\/([a-zA-Z0-9_-]+)"'

# Replacement pattern:
# replace the entire line with the captured directory name
# and append a ref tag to the end of the line before the closing double quote
replacement='source = "git@github.com:acme-org/shared-terraform-modules.git\/\/\1?ref=my-ref-tag"'

# Search directory
search_directory='.'

# Find files and perform replacement - ignore the .terraform directory
# Uncomment the sed command to perform the replacement, note this is destructive and will modify files in place
# Perform a dry run first to ensure the correct files are being modified!
find "$search_directory" -type f -name "*.tf" -not -path "*/.terraform/*" \
    # -exec sed -i '' -E "s#$pattern#$replacement#g" {} \;