yaml labels values get mixed up in bake

[kohtala]

Running docker buildx bake --print on docker-compose.yml

services:
  a:
    build:
      tags: [a]
      labels:
        a: A
        b: B
  b:
    build:
      tags: [b]
      labels:
        c: C
        d: D
        e: E

Gives

{
  "group": {
    "default": {
      "targets": [
        "a",
        "b"
      ]
    }
  },
  "target": {
    "a": {
      "context": ".",
      "dockerfile": "Dockerfile",
      "labels": {
        "a": "B",
        "b": "B"
      },
      "tags": [
        "a"
      ]
    },
    "b": {
      "context": ".",
      "dockerfile": "Dockerfile",
      "labels": {
        "c": "C",
        "d": "C",
        "e": "C"
      },
      "tags": [
        "b"
      ]
    }
  }
}

The labels values are mixed up.

With simple Dockerfile of FROM scratch you get similar results in the images using default docker builder:

$ docker image inspect a

[
    {
        "Id": "sha256:05c62be58f310cc2e2937be5c75be69ce11642b45fa344bf67f6d7012e9befcc",
        "RepoTags": [
            "a:latest"
        ],
        "RepoDigests": [],
        "Parent": "",
        "Comment": "",
        "Created": "0001-01-01T00:00:00Z",
        "Container": "",
        "ContainerConfig": {
            "Hostname": "",
            "Domainname": "",
            "User": "",
            "AttachStdin": false,
            "AttachStdout": false,
            "AttachStderr": false,
            "Tty": false,
            "OpenStdin": false,
            "StdinOnce": false,
            "Env": null,
            "Cmd": null,
            "Image": "",
            "Volumes": null,
            "WorkingDir": "",
            "Entrypoint": null,
            "OnBuild": null,
            "Labels": null
        },
        "DockerVersion": "",
        "Author": "",
        "Config": {
            "Hostname": "",
            "Domainname": "",
            "User": "",
            "AttachStdin": false,
            "AttachStdout": false,
            "AttachStderr": false,
            "Tty": false,
            "OpenStdin": false,
            "StdinOnce": false,
            "Env": [
                "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
            ],
            "Cmd": null,
            "Image": "",
            "Volumes": null,
            "WorkingDir": "/",
            "Entrypoint": null,
            "OnBuild": null,
            "Labels": {
                "a": "B",
                "b": "B"
            }
        },
        "Architecture": "amd64",
        "Os": "linux",
        "Size": 0,
        "VirtualSize": 0,
        "GraphDriver": {
            "Data": null,
            "Name": "overlay2"
        },
        "RootFS": {
            "Type": "layers"
        },
        "Metadata": {
            "LastTagTime": "0001-01-01T00:00:00Z"
        }
    }
]

$ docker image inspect b

[
    {
        "Id": "sha256:5a77f21250176bf210ebf363346a339aa9df70e17c4fc5519b354772ab3ad226",
        "RepoTags": [
            "b:latest"
        ],
        "RepoDigests": [],
        "Parent": "",
        "Comment": "",
        "Created": "0001-01-01T00:00:00Z",
        "Container": "",
        "ContainerConfig": {
            "Hostname": "",
            "Domainname": "",
            "User": "",
            "AttachStdin": false,
            "AttachStdout": false,
            "AttachStderr": false,
            "Tty": false,
            "OpenStdin": false,
            "StdinOnce": false,
            "Env": null,
            "Cmd": null,
            "Image": "",
            "Volumes": null,
            "WorkingDir": "",
            "Entrypoint": null,
            "OnBuild": null,
            "Labels": null
        },
        "DockerVersion": "",
        "Author": "",
        "Config": {
            "Hostname": "",
            "Domainname": "",
            "User": "",
            "AttachStdin": false,
            "AttachStdout": false,
            "AttachStderr": false,
            "Tty": false,
            "OpenStdin": false,
            "StdinOnce": false,
            "Env": [
                "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
            ],
            "Cmd": null,
            "Image": "",
            "Volumes": null,
            "WorkingDir": "/",
            "Entrypoint": null,
            "OnBuild": null,
            "Labels": {
                "c": "E",
                "d": "E",
                "e": "E"
            }
        },
        "Architecture": "amd64",
        "Os": "linux",
        "Size": 0,
        "VirtualSize": 0,
        "GraphDriver": {
            "Data": null,
            "Name": "overlay2"
        },
        "RootFS": {
            "Type": "layers"
        },
        "Metadata": {
            "LastTagTime": "0001-01-01T00:00:00Z"
        }
    }
]

$ docker buildx version
github.com/docker/buildx v0.10.2 00ed17d

$ dpkg -s docker-buildx-plugin

Package: docker-buildx-plugin
Status: install ok installed
Priority: optional
Section: admin
Installed-Size: 68883
Maintainer: Docker <[email protected]>
Architecture: amd64
Source: docker-ce (5:23.0.0-1~ubuntu.20.04~focal)
Version: 0.10.2-1~ubuntu.20.04~focal
Replaces: docker-ce-cli
Enhances: docker-ce-cli
Description: Docker Buildx cli plugin.
Homepage: https://github.com/docker/buildx
$ docker buildx ls
NAME/NODE DRIVER/ENDPOINT STATUS  BUILDKIT PLATFORMS
default * docker
  default default         running 23.0.1   linux/amd64, linux/amd64/v2, linux/amd64/v3, linux/arm64, linux/riscv64, linux/ppc64le, linux/s390x, linux/386, linux/mips64le, linux/mips64, linux/arm/v7, linux/arm/v6

[jedevc]

Should be fixed by #1582

This fix will be included in the next patch release of buildx, v0.10.3 at some point in the next week or so.