rsyncd: secrets file is set up by entrypoint script

rsyncd/Dockerfile

@@ -1,5 +1,9 @@
 FROM alpine:3.16
 
-RUN apk add --no-cache rsync
+COPY entrypoint.sh /entrypoint.sh 
 
-CMD ["/usr/bin/rsync", "--daemon", "--no-detach", "--config", "/etc/rsyncd.conf"]
+RUN chmod +x /entrypoint.sh && \
+    apk add --no-cache rsync
+
+ENTRYPOINT ["/entrypoint.sh"]
+CMD ["/usr/bin/rsync", "--daemon", "--no-detach", "--config", "/etc/rsyncd.conf", "--verbose"]

rsyncd/Makefile

@@ -5,13 +5,13 @@ PLATFORMS=linux/amd64,linux/arm64
 
 .PHONY: build push buildx
 
-build: Dockerfile
+build: Dockerfile entrypoint.sh
 	docker build -t $(IMG) .
 
 push: build
 	docker image push $(IMG)
 
-buildx: Dockerfile
+buildx: Dockerfile entrypoint.sh
 	docker buildx build \
 		--platform $(PLATFORMS) \
 		--tag $(IMG) \

rsyncd/entrypoint.sh

@@ -0,0 +1,8 @@
+#!/bin/sh
+
+if [ -n "$SECRETS" ]; then
+    echo "$SECRETS" > /etc/rsyncd.secrets
+    chmod 600 /etc/rsyncd.secrets
+fi
+
+exec "$@"