allow usage of userid

Dockerfile

@@ -2,8 +2,10 @@ FROM python:3.7
 
 VOLUME ["/in", "/out"]
 
-RUN python -m pip install inotify
+RUN python -m pip install inotify \
+			&& adduser mayan --disabled-password --disabled-login --no-create-home --gecos ""
 
-COPY script.py /
+COPY --chown mayan:mayan script.py /
+COPY entrypoint.sh /
 
-CMD ["python", "-u", "/script.py"]
+CMD ["/entrypoint.sh"]

entrypoint.sh

@@ -0,0 +1,18 @@
+#!/bin/sh
+
+DEFAULT_USER_UID=1000
+DEFAULT_USER_GID=1000
+
+MAYAN_USER_UID=${MAYAN_USER_UID:-${DEFAULT_USER_UID}}
+MAYAN_USER_GID=${MAYAN_USER_GID:-${DEFAULT_USER_GID}}
+
+update_uid_gid() {
+    echo "mayan: update_uid_gid()"
+    groupmod mayan -g ${MAYAN_USER_GID} 2>/dev/null || true
+    usermod mayan -u ${MAYAN_USER_UID} -g ${MAYAN_USER_GID} 2>/dev/null
+		chown -R mayan:mayan /in /out 
+}
+
+update_uid_gid
+
+su mayan -c python -u /script.py