Add archive extract files support

[bhuisgen]

Add option extractArchives to extract included WAR/JAR file when image is built (only if dockerDirectory is set).

This feature allows me to speed up my app startup and to disable war unpacking in Tomcat configuration.

My POM file :

<plugin>
    <groupId>com.spotify</groupId>
    <artifactId>docker-maven-plugin</artifactId>
    <version>${docker-maven-plugin}</version>
    <executions>
        <execution>
            <phase>package</phase>
            <goals>
                <goal>build</goal>
            </goals>
        </execution>
    </executions>
    <configuration>
        <imageName>foobot/${project.artifactId}</imageName>
        <imageTags>
            <imageTag>${project.version}</imageTag>
            <imageTag>latest</imageTag>
        </imageTags>
        <dockerDirectory>src/main/docker</dockerDirectory>
        <extractArchives>true</extractArchives>
        <resources>
            <resource>
                <directory>${project.build.directory}</directory>
                <include>ROOT.war</include>
                <targetPath>/root/usr/local/tomcat/webapps</targetPath>
            </resource>
        </resources>
    </configuration>
</plugin>

My Dockerfile :

FROM foobot/tomcat:latest
MAINTAINER Boris HUISGEN <boris@foobot.io>
COPY root /

And maven output :

[INFO] 
[INFO] --- maven-war-plugin:2.6:war (default-war) @ gatewaylab ---
[INFO] Packaging webapp
[INFO] Assembling webapp [gatewaylab] in [/home/boris/Projects/java/labs/gatewaylab/target/gatewaylab-0.0.1-SNAPSHOT]
[INFO] Processing war project
[INFO] Copying webapp resources [/home/boris/Projects/java/labs/gatewaylab/src/main/webapp]
[INFO] Webapp assembled in [127 msecs]
[INFO] Building war: /home/boris/Projects/java/labs/gatewaylab/target/gatewaylab-0.0.1-SNAPSHOT.war
[INFO] 
[INFO] --- maven-antrun-plugin:1.7:run (default) @ gatewaylab ---
[INFO] Executing tasks

main:
     [copy] Copying 1 file to /home/boris/Projects/java/labs/gatewaylab/target
[INFO] Executed tasks
[INFO] 
[INFO] --- docker-maven-plugin:0.4.5-SNAPSHOT:build (default) @ gatewaylab ---
[INFO] Extracting /home/boris/Projects/java/labs/gatewaylab/target/ROOT.war -> /home/boris/Projects/java/labs/gatewaylab/target/docker/root/usr/local/tomcat/webapps/ROOT
[INFO] Copying src/main/docker/Dockerfile -> /home/boris/Projects/java/labs/gatewaylab/target/docker/Dockerfile
[INFO] Building image foobot/gatewaylab
Step 1 : FROM foobot/tomcat:latest
 ---> be64d6f44aa8
Step 2 : MAINTAINER Boris HUISGEN <boris@foobot.io>
 ---> Using cache
 ---> bfab68dd9516
Step 3 : COPY root /
 ---> 9868e1d0dada
Removing intermediate container dcbdcc50d3c4
Successfully built 9868e1d0dada

You can see that ROOT.war is extracted into directory webapps/ROOT.

Signed-off-by: Boris HUISGEN boris@foobot.io

[kvfedorov]

I think, this might not be needed, if ADD would be used in docker file instead of COPY (and it is docker-maven-plugin default behaviour too)

[bhuisgen]

ADD doesn't extract ZIP archive (moby/moby#15036).