add version.sh to ease transition to v2.0

entrypoint.sh

@@ -1,4 +1,5 @@
 #!/usr/bin/dumb-init /bin/sh
+source version.sh
 
 # Set up key file
 KEY_FILE=${SSH_KEY_FILE:=/id_rsa}

version.sh

@@ -0,0 +1,33 @@
+#!/bin/sh
+
+# A "common-courtesy" file inspired by @gurneyalex
+#  - Information on current version.
+#  - Deprecation warnings for future versions.
+
+if [ ! -z $SSH_TUNNEL_HOST ]; then
+    echo "[WARN ] SSH_TUNNEL_HOST will be deprecated in v2.0"
+fi
+
+if [ ! -z $SSH_TUNNEL_LOCAL ]; then
+    echo "[WARN ] SSH_TUNNEL_LOCAL will be deprecated in v2.0"
+fi
+
+if [ ! -z $SSH_TUNNEL_REMOTE ]; then
+    echo "[WARN ] SSH_TUNNEL_REMOTE will be deprecated in v2.0"
+fi
+
+if [ ! -z $SSH_HOSTUSER ]; then
+    echo "[WARN ] SSH_HOSTUSER will be deprecated in v2.0"
+fi
+
+if [ ! -z $SSH_HOSTNAME ]; then
+    echo "[WARN ] SSH_HOSTNAME will be deprecated in v2.0"
+fi
+
+if [ ! -z $SSH_HOSTPORT ]; then
+    echo "[WARN ] SSH_HOSTPORT will be deprecated in v2.0"
+fi
+
+if [ ! -z $SSH_KNOWN_HOSTS ]; then
+    echo "[WARN ] SSH_KNOWN_HOSTS will be deprecated in v2.0"
+fi