chore: Refactor all hooks (#310)

terragrunt_validate.sh

@@ -1,23 +1,107 @@
 #!/usr/bin/env bash
+set -eo pipefail
 
-set -e
+function main {
+  common::initialize
+  common::parse_cmdline "$@"
+  common::per_dir_hook "${ARGS[*]}" "${FILES[@]}"
+}
 
-declare -a paths
+function common::initialize {
+  local SCRIPT_DIR
+  # get directory containing this script
+  SCRIPT_DIR="$(dirname "$(realpath "${BASH_SOURCE[0]}")")"
 
-index=0
+  # source getopt function
+  # shellcheck source=lib_getopt
+  . "$SCRIPT_DIR/lib_getopt"
+}
 
-for file_with_path in "$@"; do
-  file_with_path="${file_with_path// /__REPLACED__SPACE__}"
+function common::parse_cmdline {
+  # common global arrays.
+  # Populated via `common::parse_cmdline` and can be used inside hooks' functions
+  declare -g -a ARGS=() FILES=() HOOK_CONFIG=()
 
-  paths[index]=$(dirname "$file_with_path")
+  local argv
+  argv=$(getopt -o a:,h: --long args:,hook-config: -- "$@") || return
+  eval "set -- $argv"
 
-  let "index+=1"
-done
+  for argv; do
+    case $argv in
+      -a | --args)
+        shift
+        ARGS+=("$1")
+        shift
+        ;;
+      -h | --hook-config)
+        shift
+        HOOK_CONFIG+=("$1;")
+        shift
+        ;;
+      --)
+        shift
+        FILES=("$@")
+        break
+        ;;
+    esac
+  done
+}
 
-for path_uniq in $(echo "${paths[*]}" | tr ' ' '\n' | sort -u); do
-  path_uniq="${path_uniq//__REPLACED__SPACE__/ }"
+function common::per_dir_hook {
+  local -r args="$1"
+  shift 1
+  local -a -r files=("$@")
 
-  pushd "$path_uniq" > /dev/null
-  terragrunt validate
-  popd > /dev/null
-done
+  # consume modified files passed from pre-commit so that
+  # hook runs against only those relevant directories
+  local index=0
+  for file_with_path in "${files[@]}"; do
+    file_with_path="${file_with_path// /__REPLACED__SPACE__}"
+
+    dir_paths[index]=$(dirname "$file_with_path")
+
+    ((index += 1))
+  done
+
+  # preserve errexit status
+  shopt -qo errexit && ERREXIT_IS_SET=true
+  # allow hook to continue if exit_code is greater than 0
+  set +e
+  local final_exit_code=0
+
+  # run hook for each path
+  for dir_path in $(echo "${dir_paths[*]}" | tr ' ' '\n' | sort -u); do
+    dir_path="${dir_path//__REPLACED__SPACE__/ }"
+    pushd "$dir_path" > /dev/null || continue
+
+    per_dir_hook_unique_part "$args" "$dir_path"
+
+    local exit_code=$?
+    if [ $exit_code -ne 0 ]; then
+      final_exit_code=$exit_code
+    fi
+
+    popd > /dev/null
+  done
+
+  # restore errexit if it was set before the "for" loop
+  [[ $ERREXIT_IS_SET ]] && set -e
+  # return the hook final exit_code
+  exit $final_exit_code
+}
+
+function per_dir_hook_unique_part {
+  # common logic located in common::per_dir_hook
+  local -r args="$1"
+  local -r dir_path="$2"
+
+  # pass the arguments to hook
+  # shellcheck disable=SC2068 # hook fails when quoting is used ("$arg[@]")
+  terragrunt validate ${args[@]}
+
+  # return exit code to common::per_dir_hook
+  local exit_code=$?
+  return $exit_code
+}
+
+[ "${BASH_SOURCE[0]}" != "$0" ] || main "$@"