update entrypoint for ash complaince

abra.sh

@@ -0,0 +1 @@
+export CROC_ENTRYPOINT_VERSION=v1

compose.yml

@@ -2,15 +2,24 @@ version: '3.8'
 
 services:
   app:
-    image: schollz/croc
+    image: schollz/croc:master
     ports: 
       - 9009-9013:9009-9013
     environment:
       - CROC_PASS_FILE=/run/secrets/croc_pass
     secrets:
       - croc_pass
-     
+    configs:
+      - source: croc_entrypoint
+        target: /croc-entrypoint.sh
+        mode: 0555
+
+
 secrets:
   croc_pass:
     name: ${STACK_NAME}_croc_pass_${SECRET_CROC_PASS_VERSION}
     external: true
+configs:
+  croc_entrypoint:
+    name: ${STACK_NAME}_croc_entrypoint_${CROC_ENTRYPOINT_VERSION}
+    file: entrypoint.sh

entrypoint.sh

@@ -1,24 +1,15 @@
-#!/usr/bin/env bash
+#!/bin/ash
 
-set -e
-
-file_env() {
-    local var="$1"
-    local fileVar="${var}_FILE"
-    local def="${2:-}"
-
-    if [ "${!var:-}" ] && [ "${!fileVar:-}" ]; then
-        echo >&2 "error: both $var and $fileVar are set (but are exclusive)"
+if test -f "/run/secrets/croc_pass"; then
+    pwd=`cat /run/secrets/croc_pass`
+    if [ -z $pwd ]; then
+        echo >&2 "error: /run/secrets/croc_pass is empty"
         exit 1
     fi
-    local val="$def"
-    if [ "${!var:-}" ]; then
-        val="${!var}"
-    elif [ "${!fileVar:-}" ]; then
-        val="$(< "${!fileVar}")"
-    fi
-    export "$var"="$val"
-    unset "$fileVar"
-}
+    export "CROC_PASS"="$pwd"
+    unset "pwd"
+else
+    echo >&2 "error: /run/secrets/croc_pass does not exist"
+    exit 1
+fi
 
-file_env "CROC_PASS"