Buildpacks Support

[jamesward]

When I try to build a container with CNCF Buildpacks (via Spring Boot's build-in buildpacks) I get:

 ./gradlew bootBuildImage
Picked up JAVA_TOOL_OPTIONS: -Dlog4j2.formatMsgNoLookups=true

> Task :bootBuildImage FAILED
Building image 'docker.io/library/stateful-mcp-agentcore:latest'

 > Pulling builder image 'docker.io/paketobuildpacks/builder-noble-java-tiny:latest' Error retrieving credentials for 'https://index.docker.io/v1/' due to: Cannot run program "docker-credential-desktop": Exec failed, error: 2 (No such file or directory) 
..................................................
 > Pulled builder image 'paketobuildpacks/builder-noble-java-tiny@sha256:6e4309f92886fbbcc2a2a822b744c2a78970361c7a44d5eb718541680943bed7'
 > Pulling run image 'docker.io/paketobuildpacks/ubuntu-noble-run-tiny:0.0.73' for platform 'linux/arm64' Error retrieving credentials for 'https://index.docker.io/v1/' due to: Cannot run program "docker-credential-desktop": Exec failed, error: 2 (No such file or directory) 
..................................................
 > Pulled run image 'paketobuildpacks/ubuntu-noble-run-tiny@sha256:1625704276ccb4dac4a1aa0e0d3d0c43b8b179ff57a968e827932be452e3d7a2'
 > Executing lifecycle version v0.21.6
 > Using build cache volume 'pack-cache-4da0c7c434c5.build'

 > Running creator

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':bootBuildImage'.
> Docker API call to '/Applications/Finch/lima/data/finch/sock/finch.sockdocker:///Applications/Finch/lima/data/finch/sock/finch.sock/v1.43/containers/create' failed with status code 400 "Bad Request" and message "create container failed validation: containers.Labels: label key and value length (9274 bytes) greater than maximum size (4096 bytes), key: io.buildpacks.builder.metadata: invalid argument"

[Swapnanil-Gupta]

Thanks for reaching out. What's your DOCKER_CONFIG environment variable set to?

[jamesward]

I didn't have a DOCKER_CONFIG set. Here is a little project to test with:
https://github.com/jamesward/hello-spring-web

[Swapnanil-Gupta]

Thanks. That helps a lot.

[Swapnanil-Gupta]

Tried with DOCKER_HOST & DOCKER_CONFIG env vars set to Finch. Getting a different issue:

➜  hello-spring-web git:(main) export DOCKER_HOST=unix:///Applications/Finch/lima/data/finch/sock/finch.sock

➜  hello-spring-web git:(main) export DOCKER_CONFIG=$HOME/.finch

➜  hello-spring-web git:(main) ./gradlew bootBuildImage                                                     
> Task :bootBuildImage
Building image 'docker.io/library/hello-spring-web:latest'

 > Pulling builder image 'docker.io/paketobuildpacks/builder-noble-java-tiny:latest' ..................................................
 > Pulled builder image 'paketobuildpacks/builder-noble-java-tiny@sha256:e8135457d6723f59dab86747374524c0faad87fbfe09b851f663e2582392166d'
 > Pulling run image 'docker.io/paketobuildpacks/ubuntu-noble-run-tiny:0.0.73' for platform 'linux/arm64' ..................................................
 > Pulled run image 'paketobuildpacks/ubuntu-noble-run-tiny@sha256:1625704276ccb4dac4a1aa0e0d3d0c43b8b179ff57a968e827932be452e3d7a2'
 > Executing lifecycle version v0.21.7
 > Using build cache volume 'pack-cache-1dea3b606618.build'

 > Running creator

> Task :bootBuildImage FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':bootBuildImage'.
> Docker API call to '/Applications/Finch/lima/data/finch/sock/finch.sockdocker:///Applications/Finch/lima/data/finch/sock/finch.sock/v1.43/containers/create' failed with status code 400 "Bad Request" and message "create container failed validation: containers.Labels: label key and value length (9274 bytes) greater than maximum size (4096 bytes), key: io.buildpacks.builder.metadata: invalid argument"

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights from a Build Scan (powered by Develocity).
> Get more help at https://help.gradle.org.

BUILD FAILED in 32s
4 actionable tasks: 1 executed, 3 up-to-date

This error is coming from a limit enforced by containerd where labels have a size limit of 4096 bytes (key + value combined) - containerd/containerd#1513.