Add entrypoint script

Dockerfile

@@ -18,12 +18,16 @@ RUN CGO_ENABLED=0 GOOS=linux go build -o /gerbil
 # Start a new stage from scratch
 FROM ubuntu:22.04 AS runner
 
-RUN apt-get update && apt-get install -y nftables iproute2 wireguard && apt-get clean
+RUN apt-get update && apt-get install -y nftables && apt-get clean
 
-WORKDIR /root/
+# Copy the pre-built binary file from the previous stage and the entrypoint script
+COPY --from=builder /gerbil /usr/local/bin/
+COPY entrypoint.sh /
 
-# Copy the pre-built binary file from the previous stage
-COPY --from=builder /gerbil .
+RUN chmod +x /entrypoint.sh
+
+# Copy the entrypoint script
+ENTRYPOINT ["/entrypoint.sh"]
 
 # Command to run the executable
-CMD ["./gerbil"]
+CMD ["gerbil"]

Makefile

@@ -3,7 +3,7 @@ all:
 	docker build -t gerbil .
 
 test:
-	docker run -it -p 3002:3002 -v ./config_example.json:/config/config.json --cap-add=NET_ADMIN --cap-add=SYS_MODULE gerbil ./gerbil --config /config/config.json
+	docker run -it -p 3002:3002 -v ./config_example.json:/config/config.json --cap-add=NET_ADMIN --cap-add=SYS_MODULE gerbil --config /config/config.json
 
 local: 
 	 CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o gerbil

docker-compose.yml

@@ -1,15 +0,0 @@
-version: '3'
-
-services:
-  gerbil:
-    image: gerbil
-    container_name: gerbil
-    command: ["./gerbil", "--config", "/config/gerbil.conf"]
-    cap_add:
-      - NET_ADMIN
-      - SYS_MODULE
-    ports:
-      - 51820:51820/udp
-    volumes:
-      - ./config_example.json:/config/config.json
-    restart: unless-stopped

entrypoint.sh

@@ -0,0 +1,21 @@
+#!/bin/sh
+
+# Sample from https://github.com/traefik/traefik-library-image/blob/5070edb25b03cca6802d75d5037576c840f73fdd/v3.1/alpine/entrypoint.sh
+
+set -e
+
+# first arg is `-f` or `--some-option`
+if [ "${1#-}" != "$1" ]; then
+    set -- gerbil "$@"
+fi
+
+# if our command is a valid Gerbil subcommand, let's invoke it through Gerbil instead
+# (this allows for "docker run gerbil version", etc)
+if gerbil "$1" --help >/dev/null 2>&1
+then
+    set -- gerbil "$@"
+else
+    echo "= '$1' is not a Gerbil command: assuming shell execution." 1>&2
+fi
+
+exec "$@"

main.go

@@ -399,7 +399,7 @@ func periodicBandwidthCheck(endpoint string) {
 	}
 }
 
-func calculatePeerBandwidth() ([]PeerBandwidth, error) {
+func calculatePeerBandwidth() ([]PeerBandwidth, error) { //TODO: fix this to actually only report the change in bandwidth from the last query
 	device, err := wgClient.Device(interfaceName)
 	if err != nil {
 		return nil, fmt.Errorf("failed to get device: %v", err)