client: lib_gen: fix environment reader/resetter

- Fixes default env generation if current env exists
    * was not unsetting all previously exported env
- Adds debug output

client/src/docker/lib/internal/lib_gen.bash

@@ -269,11 +269,22 @@ function lib_gen::__set_client_globals()
 
 function lib_gen::__read_env()
 {
+  local _file="$1"
+
+  # Get environment
+  local _env=()
+  while read _line; do
+    _env+=("$_line")
+  done < <(printenv | grep -Eo "^DOCKER_FINANCE[^=]+")
+
   # Reset environment
-  unset "$(printenv | grep -Eo "^DOCKER_FINANCE[^=]+")"
+  for _line in "${_env[@]}"; do
+    lib_utils::print_debug "Unsetting $_line"
+    unset "$_line"
+  done
 
   # Set, if a script that generates env
-  if [[ "$(head -n1 $1)" =~ (bin|env|sh|bash) ]]; then
+  if [[ "$(head -n1 $_file)" =~ (bin|env|sh|bash) ]]; then
     # shellcheck source=/dev/null
     source "$global_repo_env_file"
     return $?
@@ -291,7 +302,7 @@ function lib_gen::__read_env()
       export "${_line?}" # SC2163
       lib_utils::print_debug "$_line"
     fi
-  done <"$1"
+  done <"$_file"
 }
 
 #
@@ -353,7 +364,10 @@ function lib_gen::__gen_client()
         || lib_utils::die_fatal
 
       # Get/Set with repository defaults
+      lib_utils::print_debug "Reading $global_repo_env_file"
       lib_gen::__read_env "$global_repo_env_file"
+
+      lib_utils::print_debug "Writing $global_env_file"
       lib_gen::__write_env "$global_env_file"
     fi
   fi