Unable to build on linux (Volume in Dockerfile)

[d3473r]

Hi,

i am unable to build a quarkus application with these base images as the build directory /project is defined as a volume here:

quarkus-images/quarkus-native-image.yaml

Lines 36 to 38 in 9a01a65

	volumes:
	- name: "volume.project"
	path: "/project"

and here:

quarkus-images/quarkus-mandrel.yaml

Lines 36 to 38 in 9a01a65

	volumes:
	- name: "volume.project"
	path: "/project"

I am using the sample maven Dockerfile from the docs

## Stage 1 : build with maven builder image with native capabilities
FROM quay.io/quarkus/ubi-quarkus-native-image:21.1.0-java11 AS build
COPY pom.xml /project/
COPY mvnw /project/mvnw
COPY .mvn /project/.mvn
USER quarkus
WORKDIR /project
RUN ./mvnw -B org.apache.maven.plugins:maven-dependency-plugin:3.1.2:go-offline
COPY src /project/src
RUN ./mvnw package -Pnative

## Stage 2 : create the docker final image
FROM registry.access.redhat.com/ubi8/ubi-minimal:8.4
WORKDIR /work/
COPY --from=build /project/target/*-runner /work/application

# set up permissions for user `1001`
RUN chmod 775 /work /work/application \
  && chown -R 1001 /work \
  && chmod -R "g+rwX" /work \
  && chown -R 1001:root /work

EXPOSE 8080
USER 1001

CMD ["./application", "-Dquarkus.http.host=0.0.0.0"]

The error is thrown in the final image as it tries to copy the compiled native application:

Step 12/16 : COPY --from=build /project/target/*-runner /work/application
COPY failed: no source files were specified

If I am doing an ls after the maven native build, all generated files are missing:

Step 9/17 : RUN ./mvnw package -Pnative
 ---> Using cache
 ---> 027af17a1511
Step 10/17 : RUN ls -lsh
 ---> Running in 06d8cda085b9
total 24K
 12K -rwxrwxr-x 1 root root 9.9K Jul 31 11:37 mvnw
8.0K -rw-rw-r-- 1 root root 4.3K Jul 31 11:37 pom.xml
4.0K drwxr-xr-x 4 root root 4.0K Jul 31 12:42 src

This is because any data that is written in the Dockerfile will be discarded in the next layer because the directory is specified as a volume: https://docs.docker.com/engine/reference/builder/#notes-about-specifying-volumes

The build is working fine on a mac though, I think Docker is doing some magic in the vm so it works there, but this is not in spec and does not work native with linux.

I would like to try and fix it myself, but I don't know exactely how your github actions work and i can't really test it in a fork :/

EDIT:

If i change the build directory to a directory outside the /project volume everything is working fine (But this should be fixed in the base images):

## Stage 1 : build with maven builder image with native capabilities
FROM quay.io/quarkus/ubi-quarkus-native-image:21.1.0-java11 AS build
USER root
WORKDIR /code
RUN chown quarkus:quarkus -R /code
USER quarkus
COPY pom.xml .
COPY mvnw mvnw
COPY .mvn .mvn
RUN ./mvnw -B org.apache.maven.plugins:maven-dependency-plugin:3.1.2:go-offline
COPY src src
RUN ./mvnw package -Pnative

Regards,
Fabian

[cescoffier]

So, if I understand correctly, the Quarkus documentation should be updated to not use /project but /code. Am I right?

[d3473r]

Yeah, any directory except /project will work fine. The better fix would be to change the base image, so this image doesn't have to use the

USER root 
WORKDIR /code 
RUN chown quarkus:quarkus -R /code 
USER quarkus

fix which looks more like a hack

[cescoffier]

I've opened a PR in the Quarkus doc.
Yes, looks a bit hackish, but not sure we can do better at the moment.