refactor bootnode docker

Dockerfile.bootnode

@@ -5,6 +5,8 @@ RUN apk add --no-cache make gcc musl-dev linux-headers
 ADD . /XDCchain
 RUN cd /XDCchain && make bootnode
 
+RUN chmod +x /XDCchain/build/bin/bootnode
+
 FROM alpine:latest
 
 LABEL maintainer="admin@xinfin.org"
@@ -13,10 +15,10 @@ WORKDIR /XDCchain
 
 COPY --from=builder /XDCchain/build/bin/bootnode /usr/local/bin/bootnode
 
-RUN chmod +x /usr/local/bin/bootnode
+COPY docker/bootnode ./
 
 EXPOSE 30301
 
-ENTRYPOINT ["/usr/local/bin/bootnode"]
+ENTRYPOINT ["./entrypoint.sh"]
 
-CMD ["--help"]
+CMD ["-verbosity", "6", "-nodekey", "bootnode.key", "--addr", ":30301"

docker/bootnode/entrypoint.sh

@@ -0,0 +1,24 @@
+#!/bin/sh -x
+
+ # file to env
+for env in PRIVATE_KEY; do
+  file=$(eval echo "\$${env}_FILE")
+  if [[ -f $file ]] && [[ ! -z $file ]]; then
+    echo "Replacing $env by $file"
+    export $env=$(cat $file)
+  fi
+done
+
+ # private key
+if [[ ! -z "$PRIVATE_KEY" ]]; then
+  echo "$PRIVATE_KEY" > bootnode.key
+elif [[ ! -f ./bootnode.key ]]; then
+  bootnode -genkey bootnode.key
+fi
+
+ # dump address
+address="enode://$(bootnode -nodekey bootnode.key -writeaddress)@[$(hostname -i)]:30301"
+
+ echo "$address" > ./bootnodes/bootnodes
+
+ exec bootnode "$@"