docker-build-push/TROUBLESHOOTING.md

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# Troubleshooting
* [Cannot push to a registry](#cannot-push-to-a-registry)
* [BuildKit container logs](#buildkit-container-logs)
* [With containerd](#with-containerd)
* [`repository name must be lowercase`](#repository-name-must-be-lowercase)
## Cannot push to a registry
While pushing to a registry, you may encounter these kinds of issues:
* `failed commit on ref "layer-sha256:...": invalid content digest in response: invalid checksum digest format`
* `failed commit on ref "layer-sha256:...": no response`
* `failed commit on ref "manifest-sha256:...": unexpected status: 400 Bad Request`
* `failed commit on ref "manifest-sha256:...": unexpected status: 401 Unauthorized`
* `unexpected response: 401 Unauthorized`
These issues are not directly related to this action but are rather linked to
[buildx](https://github.com/docker/buildx), [buildkit](https://github.com/moby/buildkit),
[containerd](https://github.com/containerd/containerd) or the registry on which
you're pushing your image. The quality of error message depends on the registry
and are usually not very informative.
### BuildKit container logs
To help you solve this, you have to [enable debugging in the setup-buildx](https://github.com/docker/setup-buildx-action#buildkit-container-logs)
action step and attach BuildKit container logs to your issue.
### With containerd
Next you can test pushing with [containerd action](https://github.com/crazy-max/ghaction-setup-containerd)
using the following workflow. If it works then open an issue on [buildkit](https://github.com/moby/buildkit)
repository.
```yaml
name: containerd
on:
push:
jobs:
containerd:
runs-on: ubuntu-latest
steps:
-
name: Checkout
uses: actions/checkout@v2
-
name: Set up QEMU
uses: docker/setup-qemu-action@v1
-
name: Set up Docker Buildx
uses: docker/setup-buildx-action@v1
with:
buildkitd-flags: --debug
-
name: Set up containerd
uses: crazy-max/ghaction-setup-containerd@v1
-
name: Build Docker image
uses: docker/build-push-action@v2
with:
context: .
platforms: linux/amd64,linux/arm64
tags: docker.io/user/app:latest
outputs: type=oci,dest=/tmp/image.tar
-
name: Import image in containerd
run: |
sudo ctr i import --base-name docker.io/user/app --digests --all-platforms /tmp/image.tar
-
name: Push image with containerd
run: |
sudo ctr --debug i push --user "${{ secrets.DOCKER_USERNAME }}:${{ secrets.DOCKER_PASSWORD }}" docker.io/user/app:latest
```
## `invalid reference format`
You may encounter this issue if you're using `github.repository` in your tag
name:
```
#10 importing cache manifest from ghcr.io/My-Org/repo:main
#10 ERROR: invalid reference format: repository name must be lowercase
```
## `repository name must be lowercase`
You may encounter this issue if you're using `github.repository` as a repo slug
in your tag:
```
#6 exporting to image
#6 exporting layers
#6 exporting layers 1.2s done
#6 exporting manifest sha256:b47f7dfb97b89ccd5de553af3c8cd94c4795884cbe5693e93946b1d95a7b1d12 0.0s done
#6 exporting config sha256:995e93fab8196893192f08a38deea6769dc4d98f86cf705eccc24ec96a3e271c 0.0s done
#6 ERROR: invalid reference format: repository name must be lowercase
------
> exporting to image:
------
error: failed to solve: invalid reference format: repository name must be lowercase
```
or a cache reference:
```
#10 importing cache manifest from ghcr.io/My-Org/repo:main
#10 ERROR: invalid reference format: repository name must be lowercase
```
To fix this issue you can use our [metadata action](https://github.com/docker/metadata-action)
to generate sanitized tags, or a dedicated step to sanitize the slug:
```yaml
- name: Sanitize repo slug
uses: actions/github-script@v4
id: repo_slug
with:
result-encoding: string
script: return `ghcr.io/${github.repository.toLowerCase()}`
- name: Build and push
uses: docker/build-push-action@v2
with:
context: .
push: true
tags: ${{ steps.repo_slug.outputs.result }}:latest
```