When using the 0.140.2-onbuild image, the nginx start screen is displayed

[masutaka]

Describe the bug

When starting a Docker image built with Cloud Build on Cloud Run, the nginx start screen is displayed.

To Reproduce

The issue can also be reproduced on macOS (Sequoia) by setting DOCKER_BUILDKIT=0.

Dockerfile:

FROM floryn90/hugo:0.140.2-onbuild AS hugo

FROM nginx
COPY --from=hugo /target /usr/share/nginx/html

The HTML files that Hugo generates are not copied to /usr/share/nginx/html.

# Build the Docker image in Hugo project
$ DOCKER_BUILDKIT=0 docker build . -t masutaka/hugo:0.140.2-onbuild

$ docker run --rm --entrypoint sh -it masutaka/hugo:0.140.2-onbuild

$ ls -alF /usr/share/nginx/html
total 16
drwxr-xr-x 1 root root 4096 Jan  5 10:39 ./
drwxr-xr-x 1 root root 4096 Dec 24 23:02 ../
-rw-r--r-- 1 root root  497 Nov 26 15:55 50x.html
-rw-r--r-- 1 root root  615 Nov 26 15:55 index.html

• The issue does not occur with 0.138.0-onbuild.
• The issue occurs with 0.140.1-onbuild and 0.140.2-onbuild.

Additional context

It seems the fix for the permission error I pointed out in #194 was incomplete.

[floryn90]

hi @masutaka,

You have to use DOCKER_BUILDKIT=1 if you want to use the Docker's multi-stage builds: https://docs.docker.com/build/building/multi-stage/

Closing the issue since it's not related to the Hugo's image

[masutaka]

I see. Why was multi-stage build enabled in Cloud Build up until 0.138.0-onbuild, but disabled in 0.140.2-onbuild?
I'll look into it. Thank you.