fix(non-linux): Bash environment variables in arguments not expanded …

…+ Add `trace` log level (#645)

---------

Co-authored-by: George L. Yermulnik <yz@yz.kiev.ua>

README.md

@@ -38,6 +38,7 @@ If you are using `pre-commit-terraform` already or want to support its developme
   * [All hooks: Usage of environment variables in `--args`](#all-hooks-usage-of-environment-variables-in---args)
   * [All hooks: Set env vars inside hook at runtime](#all-hooks-set-env-vars-inside-hook-at-runtime)
   * [All hooks: Disable color output](#all-hooks-disable-color-output)
+  * [All hooks: Log levels](#all-hooks-log-levels)
   * [Many hooks: Parallelism](#many-hooks-parallelism)
   * [checkov (deprecated) and terraform\_checkov](#checkov-deprecated-and-terraform_checkov)
   * [infracost\_breakdown](#infracost_breakdown)
@@ -341,6 +342,18 @@ To disable color output for all hooks, set `PRE_COMMIT_COLOR=never` var. Eg:
 PRE_COMMIT_COLOR=never pre-commit run
 ```
 
+### All hooks: Log levels
+
+In case you need to debug hooks, you can set `PCT_LOG=trace`.
+
+For example:
+
+```bash
+PCT_LOG=trace pre-commit run -a
+```
+
+Less verbose log levels will be implemented in [#562](https://github.com/antonbabenko/pre-commit-terraform/issues/562).
+
 ### Many hooks: Parallelism
 
 > All, except deprecated hooks: `checkov`, `terraform_docs_replace` and hooks which can't be paralleled this way: `infracost_breakdown`, `terraform_wrapper_module_for_each`.  

hooks/_common.sh

@@ -1,6 +1,22 @@
 #!/usr/bin/env bash
 set -eo pipefail
 
+if [[ $PCT_LOG == trace ]]; then
+
+  echo "BASH path: '$BASH'"
+  echo "BASH_VERSION: $BASH_VERSION"
+  echo "BASHOPTS: $BASHOPTS"
+  echo "OSTYPE: $OSTYPE"
+
+  # ${FUNCNAME[*]} - function calls in reversed order. Each new function call is appended to the beginning
+  # ${BASH_SOURCE##*/} - get filename
+  # $LINENO - get line number
+  export PS4='\e[2m
+trace: ${FUNCNAME[*]}
+       ${BASH_SOURCE##*/}:$LINENO: \e[0m'
+
+  set -x
+fi
 # Hook ID, based on hook filename.
 # Hook filename MUST BE same with `- id` in .pre-commit-hooks.yaml file
 # shellcheck disable=SC2034 # Unused var.
@@ -112,7 +128,7 @@ function common::parse_and_export_env_vars {
     while true; do
       # Check if at least 1 env var exists in `$arg`
       # shellcheck disable=SC2016 # '${' should not be expanded
-      if [[ "$arg" =~ .*'${'[A-Z_][A-Z0-9_]+?'}'.* ]]; then
+      if [[ "$arg" =~ '${'[A-Z_][A-Z0-9_]*'}' ]]; then
         # Get `ENV_VAR` from `.*${ENV_VAR}.*`
         local env_var_name=${arg#*$\{}
         env_var_name=${env_var_name%%\}*}