client/container: implement debug log-levels

DOCKER_FINANCE_DEBUG will now support the following:

0 = no debug output
1 = `print_debug` (bash/PHP)
2 = level 1 + `set -xv` (bash)

client/docker-finance.d/client/env/gen.bash

@@ -31,8 +31,8 @@ export DOCKER_FINANCE_VERSION="$global_client_version"
 
 # Developer related
 
-if [ -z "$DOCKER_FINANCE_DEBUG" ]; then
-  export DOCKER_FINANCE_DEBUG=false
+if [[ -z "$DOCKER_FINANCE_DEBUG" || ! "$DOCKER_FINANCE_DEBUG" =~ ^0$|^1$|^2$ ]]; then
+  export DOCKER_FINANCE_DEBUG=0
 fi
 
 # Allows transparent r/w of mounted volumes

client/src/docker/completion.bash

@@ -18,14 +18,15 @@
 # along with this program. If not, see <https://www.gnu.org/licenses/>.
 
 # WARNING: because of completion, the docker-finance environment file
-# is never read. Ergo, for debugging, you'll need to run the following:
+# is never read. Ergo, for debugging, you'll need to run the following
+# with log-level 1 or 2:
 #
-#   `export DOCKER_FINANCE_DEBUG=true && . ~/.bashrc`
+#   `export DOCKER_FINANCE_DEBUG=2 && . ~/.bashrc`
 #
 # and then proceed to call `docker-finance` / `dfi` with your commands.
 
 # shellcheck disable=SC2154
-[ "$DOCKER_FINANCE_DEBUG" == true ] && set -xv
+[ "$DOCKER_FINANCE_DEBUG" == 2 ] && set -xv
 
 # If not yet installed, gracefully exit
 if ! hash docker &>/dev/null; then

client/src/docker/docker.bash

@@ -161,7 +161,7 @@ function main()
   lib_docker::docker "$@" || lib_utils::die_usage "$_usage"
 
   # shellcheck disable=SC2154
-  [ "$DOCKER_FINANCE_DEBUG" == true ] && set -xv
+  [ "$DOCKER_FINANCE_DEBUG" == 2 ] && set -xv
 
   #
   # Command facade