refactor: make distribution jar executable

Author: devshawn

Dockerfile

@@ -2,6 +2,5 @@ FROM openjdk:8-slim
 
 RUN apt-get update && apt-get install -y python3 python3-pip curl
 
-COPY ./build/libs/kafka-gitops-all.jar /usr/local/bin/kafka-gitops-all.jar
-COPY ./kafka-gitops /usr/local/bin/kafka-gitops
+COPY ./build/output/kafka-gitops /usr/local/bin/kafka-gitops
 

build.gradle

@@ -68,9 +68,13 @@ jar {
     }
 }
 
+task buildExecutableJar(type: Exec) {
+    commandLine "bash", "build.sh"
+}
+
 task buildRelease(type: Zip, group: "build") {
-    from("$buildDir/libs")
-    from("./kafka-gitops")
+    from("$buildDir/output")
 }
 
-buildRelease.dependsOn shadowJar
+buildRelease.dependsOn buildExecutableJar
+buildExecutableJar.dependsOn shadowJar

build.sh

@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+
+mkdir -p build/output
+
+cat stub.sh ./build/libs/kafka-gitops-all.jar > build/output/kafka-gitops
+chmod +x build/output/kafka-gitops

docs/installation.md

@@ -4,7 +4,7 @@ Installing `kafka-gitops` requires either **Java** or **Docker**.
 
 ## Local
 
-Install `kafka-gitops` by downloading the zip file from our [releases][releases] page. Move the `kafka-gitops` file and the `kafka-gitops-all.jar` file to somewhere on your `$PATH`, such as `/usr/local/bin`. 
+Install `kafka-gitops` by downloading the zip file from our [releases][releases] page. Move the `kafka-gitops` file to somewhere on your `$PATH`, such as `/usr/local/bin`. 
 
 
 Ensure the command is working by running:

kafka-gitops

@@ -0,0 +1,9 @@
+#!/bin/sh
+MYSELF=`which "$0" 2>/dev/null`
+[ $? -gt 0 -a -f "$0" ] && MYSELF="./$0"
+java=java
+if test -n "$JAVA_HOME"; then
+    java="$JAVA_HOME/bin/java"
+fi
+exec "$java" -jar $MYSELF "$@"
+exit 1