kustdiff

#!/usr/bin/env bash

set -eux

TMP_DIR="$(mktemp -d)"
ROOT_DIR="${INPUT_ROOT_DIR:-${1:-./kustomize}}"  # First check env var, then argument, then default
MAX_DEPTH="${INPUT_MAX_DEPTH:-2}"  # Default to 2 if not specified
DEBUG="${DEBUG:-true}"

function debug_log() {
  if [ "$DEBUG" = "true" ]; then
    printf "[DEBUG] %s \n" "$1"
  fi
}

function validate_root_dir() {
  if [ ! -d "$ROOT_DIR" ]; then
    echo "Error: Root directory '$ROOT_DIR' does not exist"
    exit 1
  fi
}

function validate_max_depth() {
  if ! [[ "$MAX_DEPTH" =~ ^[0-9]+$ ]]; then
    echo "Error: max_depth must be a positive integer, got: $MAX_DEPTH"
    exit 1
  fi
}

function get_targets {
  find "$ROOT_DIR" -maxdepth "$MAX_DEPTH" -name kustomization.yaml -exec dirname {} \;
}

function safe_dirname() {
  echo "$1" | sed 's/[^a-zA-Z0-9.]/_/g'
}

function safe_filename() {
  echo "$1" | sed 's/[^a-zA-Z0-9.]/_/g'
}

function build {
  local ref="$1"
  local safe_ref=$(safe_filename "$ref")
  echo "Checking out ref: $ref"
  git checkout "$ref" --quiet
  mkdir -p "$TMP_DIR/$safe_ref"
  for envpath in $(get_targets); do
    local relative_path="${envpath#$ROOT_DIR/}"
    local safe_path=$(safe_filename "$relative_path")
    local output_file="$TMP_DIR/$safe_ref/${safe_path}.yaml"
    echo "Running kustomize for $envpath"
    kustomize build "$envpath" -o "$output_file"

#    debug_log "Contents of $output_file:"
#    debug_log "$(cat "$output_file")"
#    debug_log "End of $output_file"
#    debug_log "------------------------------------"
  done
}

function main {
  # Validate inputs before proceeding
  validate_root_dir
  validate_max_depth

  git config --global --add safe.directory "$GITHUB_WORKSPACE"
  local diff escaped_output output
  build "$INPUT_HEAD_REF"
  build "$INPUT_BASE_REF"

  local safe_head_ref=$(safe_dirname "$INPUT_HEAD_REF")
  local safe_base_ref=$(safe_dirname "$INPUT_BASE_REF")

  set +e
  diff=$(git diff --no-index "$TMP_DIR/$safe_base_ref" "$TMP_DIR/$safe_head_ref")

  debug_log "Git diff output:"
  debug_log "$diff"
  debug_log "End of git diff output"
  debug_log "------------------------------------"

  if [[ -z "$diff" ]]; then
    output="No differences found between $INPUT_BASE_REF and $INPUT_HEAD_REF"
  else
    # Just pass through the raw git diff output
    output="$diff"
  fi

  escaped_output=${output//$'\n'/'%0A'}

  if [ ${#escaped_output} -gt 65000 ]; then
    escaped_output="Output is greater than 65000 characters, and therefore too large to print as a github comment."
  fi

  echo "::set-output name=diff::$escaped_output"
}

# Print initial configuration
echo "Configuration:"
echo "ROOT_DIR: $ROOT_DIR"
echo "MAX_DEPTH: $MAX_DEPTH"
echo "DEBUG: $DEBUG"
debug_log "Debug mode is enabled"

main