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dynamically changes lifecycle ignore_changes
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| #!/bin/bash | |
| # DISCLAIMER: There is a lot of room for improvement in this script. It is a quick and dirty solution. | |
| # Description: This script adds a lifecycle block to a resource or data source in a Terraform file focused on ignore_changes. | |
| # This can be useful in conjunction with terragrunt and its hooks: | |
| # | |
| # terragrunt.hcl content: | |
| # | |
| # terraform { | |
| # source = "git::https://github.com......" | |
| # | |
| # before_hook "lifecycle_ignore_changes_random_password_this_length" { | |
| # commands = ["apply", "plan"] | |
| # execute = [ | |
| # "lifecycle_block.sh", | |
| # "${get_repo_root()}/${path_relative_to_include()}", | |
| # "random_password", | |
| # "this", | |
| # "length, override_special", | |
| # # "\\ncreate_before_destroy = true\\n" | |
| # ] | |
| # } | |
| # } | |
| # Variables | |
| PATH_TO_TERRAGRUNT_CACHE="${1}/.terragrunt-cache" | |
| NAME="$2" | |
| IDENTIFIER="$3" | |
| IGNORE_CHANGES="$4" | |
| ADDITIONAL_LIFECYCLE_VALUES="$5" | |
| IS_RESOURCE="${6:-true}" | |
| [[ "$IS_RESOURCE" = "true" ]] && PREFIX="resource" || PREFIX="data" | |
| # Tools | |
| BIN_SED=$(which gsed || which sed) | |
| BIN_AWK=$(which gawk || which awk) | |
| # Function to print usage | |
| print_usage() { | |
| echo "Usage: $0 <path-to-terragrunt-file> <name> <identifier> <ignore_changes> [additional_lifecycle_values] [is_resource]" | |
| echo "Example: $0 . random_password this \"length, min_lower, special\"" | |
| } | |
| # Function to check arguments | |
| check_arguments() { | |
| if [ -z "$NAME" ] || [ -z "$IDENTIFIER" ]; then | |
| print_usage | |
| exit 1 | |
| fi | |
| } | |
| # Function to find file to modify | |
| find_file() { | |
| local name=$1 | |
| local identifier=$2 | |
| local prefix=$3 | |
| local file | |
| file=$(grep -Rl "${prefix} \"${name}\" \"${identifier}\"" . | grep -E \.tf$) | |
| echo "$file" | |
| } | |
| # Function to add lifecycle block | |
| add_lifecycle_block() { | |
| local file_to_modify=$1 | |
| "$BIN_SED" -i -e "/${PREFIX} \"${NAME}\" \"${IDENTIFIER}\"/a \ \ lifecycle \{\n\ \ \ \ ignore_changes = \[ $IGNORE_CHANGES \] \n $ADDITIONAL_LIFECYCLE_VALUES \}" $file_to_modify | |
| } | |
| # Main function | |
| main() { | |
| # Check arguments | |
| check_arguments | |
| # Change directory | |
| OLD_DIR="$(pwd)" | |
| cd "$PATH_TO_TERRAGRUNT_CACHE" | |
| # Find file to modify | |
| file_to_modify=$(find_file "$NAME" "$IDENTIFIER" "$PREFIX") | |
| if [ -z "$file_to_modify" ]; then | |
| echo "Resource not found" | |
| exit 1 | |
| fi | |
| echo "Patching lifecycle in $file_to_modify ..." | |
| # Check if lifecycle already exists | |
| if cat $file_to_modify | "$BIN_AWK" "/${PREFIX} \"${NAME}\" \"${IDENTIFIER}\"/,/^}$/" | grep -q "lifecycle {" > /dev/null; then | |
| echo "Lifecycle already exists. Ignoring this script." | |
| exit 0 | |
| fi | |
| # Add lifecycle block | |
| add_lifecycle_block $file_to_modify | |
| # Return to original directory | |
| cd "$OLD_DIR" | |
| } | |
| # Call main function | |
| main |
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