configuration->images->image->build->assembly->targetDir not working despite no dockerfile

Using XML config (not Dockerfile), the plugin consistently builds an image containing the jar file under /maven/ directory, despite having targetDir configured to /

Info

The docs say that targetDir defines where the artifact is included, but I can’t get the plugin to accept my value, which is / or the root.

I’ve tried both <targetDir></targetDir> and <targetDir>/</targetDir>

It ignores the setting and places the jar in the /maven/ directory like this:

[INFO] DOCKER> Step 2/5 : COPY maven /maven/

I see in the docs there’s a comment that the targetDir is ignored when a Dockerfile is in use, but in this case there isn’t.

I can work around this by declaring <name>/</name> which gives me

[INFO] DOCKER> Step 2/5 : COPY / ///

and the jar ends up in root.

Took me a while to discover that. I assume this would be instantly reproducible in any project. Here’s my XML:

           <plugin>
                <groupId>io.fabric8</groupId>
                <artifactId>docker-maven-plugin</artifactId>
                <configuration>
                    <logStdout>true</logStdout>
                    <outputDirectory>target/docker-build</outputDirectory>
                    <verbose>true</verbose>
                    <images>
                        <image>
                            <name>${gem.docker.registry}/tardis/tardis</name>
                            <build>
                                <tags>
                                    <tag>latest</tag>
                                    <tag>${git.branch}-${project.version}</tag>
                                    <tag>${git.branch}-latest</tag>
                                </tags>
                                <entryPoint>
                                    <exec>
                                        <arg>java</arg>
                                        <arg>-Dlogging.file=/logs/tardis.log</arg>
                                        <arg>-Djava.security.auth.login.config=/config/login.conf</arg>
                                        <arg>-Djava.security.krb5.conf=/config/krb5.conf</arg>
                                        <arg>-jar</arg>
                                        <arg>tardis.jar</arg>
                                    </exec>
                                </entryPoint>
                                <from>frolvlad/alpine-oraclejdk8:slim</from>
                                <volumes>
                                    <volume>/tmp</volume>
                                </volumes>
                                <runCmds>
                                    <run>mkdir /logs</run>
                                </runCmds>
                                <assembly>
                                    <targetDir></targetDir>
                                    <inline>
                                        <files>
                                            <file>
                                                <source>${project.build.directory}/${build.finalName}.${project.packaging}</source>
                                                <outputDirectory>/</outputDirectory>
                                                <destName>tardis.jar</destName>
                                            </file>
                                        </files>
                                        <fileSet>
                                            <directory>${project.build.directory}/config</directory>
                                            <outputDirectory>/config</outputDirectory>
                                        </fileSet>
                                    </inline>
                                </assembly>
                            </build>
                        </image>
                    </images>
                </configuration>
            </plugin>

• d-m-p version : 0.22.1
• Maven version (mvn -v) : 3.3.9
• Docker version : 17.06.2

[rhuss]

You mapping were simply a bit off. I fixed it with this:

                               <assembly>
                                    <targetDir>/</targetDir>
                                    <inline>
                                        <files>
                                            <file>
                                                <source>${project.build.directory}/${build.finalName}.${project.packaging}</source>
                                                <outputDirectory>.</outputDirectory>
                                                <destName>test.jar</destName>
                                            </file>
                                        </files>
                                        <fileSet>
                                            <directory>${project.build.directory}/classes/config</directory>
                                            <outputDirectory>config</outputDirectory>
                                            <includes>
                                                <include>**/login.conf</include>
                                                <include>**/krb5.conf</include>
                                            </includes>
                                        </fileSet>
                                    </inline>
                                </assembly>

• targetDir to /
• All other output pathes should be relative
• You config mapping was faulty:
  • The config filres are copied to target/classes as they are in src/main/resources.
  • config was mentioned twice: In include and in the directory
• No need to give the assembly a null name.

The snippet above works for me when running mvn package.

Does it work for you, too ?

[adam42a]

Right! Sorry, I’m new to docker. I thought that tar image was the same as the final docker image but obviously not. Trying to take shortcuts were there weren’t any 👎

I think what was also concerning me was the directory name ‘maven’ which just seemed wrong but now I realise it’s purely a temporary artifact of the plugin process.

Thanks for the help.