initial commit: add dockerfile

Dockerfile

@@ -0,0 +1,11 @@
+FROM alpine:latest
+
+RUN apk add --no-cache nginx python3 py3-virtualenv
+
+RUN python3 -m venv /venv
+RUN /venv/bin/pip install -U pip certbot certbot-nginx
+
+RUN apk del py3-virtualenv && rm -rf /var/cache/apk
+
+COPY ./entrypoint.sh /
+CMD ["/entrypoint.sh"]

entrypoint.sh

@@ -0,0 +1,33 @@
+#!/bin/ash
+
+if [ ! -e /etc/letsencrypt ]
+then
+  echo "[!!] Certbot directory is not initialized"
+  echo "[!!] Either it's the first run or you forgot to add a volume"
+
+  # check if stdin (fd 0) is assigned to a tty
+  [ ! -t 0 ] && echo "Not a TTY! Exiting" && exit 1
+
+  /venv/bin/certbot certonly --nginx
+  exit $?
+fi
+
+/usr/sbin/nginx -c /etc/nginx/nginx.conf &
+ngpid=$!
+waitpid=""
+
+ctrlc () {
+  kill -QUIT "$ngpid"
+  [ -n "$waitpid" ] && kill -INT "$waitpid"
+}
+
+trap ctrlc INT
+trap ctrlc TERM
+
+while true
+do
+  /venv/bin/certbot renew --post-hook "kill -HUP $ngpid"
+  sleep 12h &
+  waitpid=$!
+  wait
+done