Merge pull request #209 from rcthomas/add-file-env-to-entrypoint

Add file_env function to set the token env var

Author: minrk

chp-docker-entrypoint

@@ -2,6 +2,35 @@
 # Wrapper around CHP entrypoint that changes defaults slightly
 # to be more appropriate when run in a container.
 
+# usage: file_env VAR [DEFAULT]
+#    ie: file_env 'XYZ_DB_PASSWORD' 'example'
+# (will allow for "$XYZ_DB_PASSWORD_FILE" to fill in the value of
+#  "$XYZ_DB_PASSWORD" from a file, especially for Docker's secrets feature)
+file_env() {
+  var=$1
+  file_var="${var}_FILE"
+  var_value=$(printenv $var || true)
+  file_var_value=$(printenv $file_var || true)
+  default_value=$2
+
+  if [ -n "$var_value" -a -n "$file_var_value" ]; then
+    echo >&2 "error: both $var and $file_var are set (but are exclusive)"
+    exit 1
+  fi
+
+  if [ -z "${var_value}" ]; then
+    if [ -z "${file_var_value}" ]; then
+      export "${var}"="${default_value}"
+    else
+      export "${var}"="$(cat $file_var_value)"
+    fi
+  fi
+
+  unset "$file_var"
+}
+
+file_env 'CONFIGPROXY_AUTH_TOKEN'
+
 case "$@" in
   *"--api-ip"*)
     break;;