feat: Adds support for Terrascan (#195)

terrascan.sh

@@ -0,0 +1,73 @@
+#!/usr/bin/env bash
+set -eo pipefail
+
+main() {
+  initialize_
+  parse_cmdline_ "$@"
+
+  # propagate $FILES to custom function
+  terrascan_ "$ARGS" "$FILES"
+}
+
+terrascan_() {
+  # consume modified files passed from pre-commit so that
+  # terrascan runs against only those relevant directories
+  for file_with_path in $FILES; do
+    file_with_path="${file_with_path// /__REPLACED__SPACE__}"
+    paths[index]=$(dirname "$file_with_path")
+
+    let "index+=1"
+  done
+
+  for path_uniq in $(echo "${paths[*]}" | tr ' ' '\n' | sort -u); do
+    path_uniq="${path_uniq//__REPLACED__SPACE__/ }"
+    pushd "$path_uniq" > /dev/null
+    terrascan scan -i terraform $ARGS
+    popd > /dev/null
+  done
+}
+
+initialize_() {
+  # get directory containing this script
+  local dir
+  local source
+  source="${BASH_SOURCE[0]}"
+  while [[ -L $source ]]; do # resolve $source until the file is no longer a symlink
+    dir="$(cd -P "$(dirname "$source")" > /dev/null && pwd)"
+    source="$(readlink "$source")"
+    # if $source was a relative symlink, we need to resolve it relative to the path where the symlink file was located
+    [[ $source != /* ]] && source="$dir/$source"
+  done
+  _SCRIPT_DIR="$(dirname "$source")"
+
+  # source getopt function
+  # shellcheck source=lib_getopt
+  . "$_SCRIPT_DIR/lib_getopt"
+}
+
+parse_cmdline_() {
+  declare argv
+  argv=$(getopt -o a: --long args: -- "$@") || return
+  eval "set -- $argv"
+
+  for argv; do
+    case $argv in
+      -a | --args)
+        shift
+        ARGS+=("$1")
+        shift
+        ;;
+      --)
+        shift
+        FILES+=("$@")
+        break
+        ;;
+    esac
+  done
+}
+
+# global arrays
+declare -a ARGS=()
+declare -a FILES=()
+
+[[ ${BASH_SOURCE[0]} != "$0" ]] || main "$@"