update entrypoint config

Author: netbuffer

.env/docker-entrypoint.d/hello.sh

@@ -0,0 +1,3 @@
+#!/bin/bash
+
+echo "Hello, World!"

Dockerfile

@@ -1,7 +1,10 @@
 FROM openjdk:8
 LABEL author="netbuffer" version="1.0"
+COPY help/docker-entrypoint.sh /
+RUN mkdir /docker-entrypoint.d
+ENTRYPOINT ["/docker-entrypoint.sh"]
 WORKDIR /
 ENV JAVA_OPTS=
-ADD target/spring-boot-demo.jar /
+ADD target/*.jar /app.jar
 EXPOSE 9100
-ENTRYPOINT java ${JAVA_OPTS} -jar /spring-boot-demo.jar
+CMD java ${JAVA_OPTS} -jar /app.jar

docker-compose.yml

@@ -10,6 +10,8 @@ services:
         cn.netbuffer.springboot.demo.author: "netbuffer"
         cn.netbuffer.springboot.demo.label-with-empty-value: ""
     image: netbuffer/spring-boot-demo:1.0
+    container_name: spring-boot-demo-container
+    hostname: spring-boot-demo
     ports:
       - "9100:9100"
     mem_swappiness: 70
@@ -22,5 +24,6 @@ services:
     environment:
       TZ: Asia/Shanghai
       JAVA_OPTS: -Xms4g -Xmx8g
-    container_name: spring-boot-demo-container
     restart: "no"
+    volumes:
+      - .env/docker-entrypoint.d/:/docker-entrypoint.d

help/docker-entrypoint.sh

@@ -0,0 +1,45 @@
+#!/bin/sh
+# vim:sw=4:ts=4:et
+
+set -e
+
+entrypoint_log() {
+    if [ -z "${SBD_APP_ENTRYPOINT_QUIET_LOGS:-}" ]; then
+        echo "$@"
+    fi
+}
+
+if /usr/bin/find "/docker-entrypoint.d/" -mindepth 1 -maxdepth 1 -type f -print -quit 2>/dev/null | read v; then
+    entrypoint_log "$0: /docker-entrypoint.d/ is not empty, will attempt to perform configuration"
+
+    entrypoint_log "$0: Looking for shell scripts in /docker-entrypoint.d/"
+    find "/docker-entrypoint.d/" -follow -type f -print | sort -V | while read -r f; do
+        case "$f" in
+            *.envsh)
+                if [ -x "$f" ]; then
+                    entrypoint_log "$0: Sourcing $f";
+                    . "$f"
+                else
+                    # warn on shell scripts without exec bit
+                    entrypoint_log "$0: Ignoring $f, not executable";
+                fi
+                ;;
+            *.sh)
+                if [ -x "$f" ]; then
+                    entrypoint_log "$0: Launching $f";
+                    "$f"
+                else
+                    # warn on shell scripts without exec bit
+                    entrypoint_log "$0: Ignoring $f, not executable";
+                fi
+                ;;
+            *) entrypoint_log "$0: Ignoring $f";;
+        esac
+    done
+
+    entrypoint_log "$0: Configuration complete; ready for start up"
+else
+    entrypoint_log "$0: No files found in /docker-entrypoint.d/, skipping configuration"
+fi
+
+exec "$@"