unknown cache exporter

[cortopy]

Contributing guidelines

• I've read the contributing guidelines and wholeheartedly agree

I've found a bug, and:

• The documentation does not mention anything about my problem
• There are no open or closed issues that are related to my problem

Description

I'm running bake-action like this:

     - name: Build and push
        uses: docker/bake-action@v6
        env:
          versions_string: ${{ steps.short-sha.outputs.sha }},latest
        with:
          push: true
          files: |
            ./${{ matrix.package.directory }}/docker-bake.hcl
          set: |
            *.cache-from="type=gha"
            *.cache-to="type=gha,mode=max"

and I'm getting error:

ERROR: failed to solve: unknown cache exporter: "gha,mode=max"

I've searched for other issues in the repo, and my configuration matches what others have said in the past should work I think

Expected behaviour

Action uses gha docker cache

Actual behaviour

Image doesn't build due to error

Repository URL

No response

Workflow run URL

No response

YAML workflow

name: Development Build

on:
  push:
    branches:
      - development

jobs:
  determine-apps-affected:
    # ....
          

  build_image:
    runs-on: ubuntu-22.04
    needs: [determine-apps-affected]
    strategy:
      matrix:
        package: ${{ fromJson(needs.determine-apps-affected.outputs.matrix) }}
    steps:
      - uses: benjlevesque/short-sha@v3.0
        id: short-sha
        with:
          length: 6

      - name: Login to container registry
        uses: docker/login-action@v3
        with:
          registry: ${{ VARS.CONTAINER_REGISTRY }}
          username: ${{ vars.CONTAINER_REGISTRY_USERNAME }}
          password: ${{ secrets.CONTAINER_REGISTRY_PASSWORD }}

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v3

      - name: Build and push
        uses: docker/bake-action@v6
        env:
          versions_string: ${{ steps.short-sha.outputs.sha }},latest
        with:
          push: true
          files: |
            ./${{ matrix.package.directory }}/docker-bake.hcl
          set: |
            *.cache-from="type=gha"
            *.cache-to="type=gha,mode=max"

Workflow logs

No response

BuildKit logs

Additional info

No response

[crazy-max]

This syntax looks correct:

          set: |
            *.cache-from="type=gha"
            *.cache-to="type=gha,mode=max"

But it should be:

          set: |
            *.cache-from=type=gha
            *.cache-to=type=gha,mode=max

I wonder if csv-parse library has an issue parsing with quotes.

Can you show the full logs of the Build and push step please?

[crazy-max]

Ok I tried on my side and it gives:

/usr/bin/docker buildx bake https://github.com/docker/test-docker-action.git#032e801d9756d88af32f1c3acceea67f3446c6cf --allow fs=* --set *.cache-from="type=gha" --set *.cache-to="type=gha,mode=max" --metadata-file /home/runner/work/_temp/docker-actions-toolkit-yWiaQB/bake-metadata-e1910d2271.json --provenance mode=min,inline-only=true,builder-id=https://github.com/docker/test-docker-action/actions/runs/13720577244/attempts/1 image --print

  {
    "group": {
      "default": {
        "targets": [
          "image"
        ]
      }
    },
    "target": {
      "image": {
        "attest": [
          {
            "builder-id": "https://github.com/docker/test-docker-action/actions/runs/13720577244/attempts/1",
            "inline-only": "true",
            "mode": "min",
            "type": "provenance"
          }
        ],
        "context": "https://github.com/docker/test-docker-action.git#032e801d9756d88af32f1c3acceea67f3446c6cf",
        "dockerfile": "./multistage.Dockerfile",
        "cache-from": [
          {
            "type": "gha"
          }
        ],
        "cache-to": [
          {
            "type": "gha,mode=max"
          }
        ],
        "platforms": [
          "linux/amd64",
          "linux/arm64"
        ]
      }
    }
  }

This is wrong though:

        "cache-to": [
          {
            "type": "gha,mode=max"
          }
        ],

I tried locally with:

docker buildx bake --set *.cache-to="type=gha,mode=max" --print

But works fine:

      "cache-to": [
        {
          "mode": "max",
          "type": "gha"
        }
      ],

So I wonder if this has something to do with args passed to exec in GitHub's toolkit: https://github.com/actions/toolkit/blob/dc22dc7cad322ab3cf9280133face378c63195f7/packages/exec/src/exec.ts#L17