All Chainguard Images contain verifiable signatures and high-quality SBOMs (software bill of materials), features that enable users to confirm the origin of each image build and have a detailed list of everything that is packed within.
You'll need cosign and jq in order to download and verify image attestations.
Registry and Tags for argo-workflowcontroller Image
Attestations are provided per image build, so you'll need to specify the correct tag and registry when pulling attestations from an image with cosign
.
cgr.dev/chainguard
- the Public Registry contains our Developer Images, which typically comprise the latest*
versions of an image.
cgr.dev/<your-org-name>
- contains all Production Images that your organisation has access to.
The commands listed on this page will default to the latest
tag, but you can specify a different tag to fetch attestations for.
Verifying argo-workflowcontroller Image Signatures
The argo-workflowcontroller Chainguard Images are signed using Sigstore, and you can check the included signatures using cosign
.
The cosign verify
command will pull detailed information about all signatures found for the provided image.
Developer Images
cosign verify \
--certificate-oidc-issuer=https://token.actions.githubusercontent.com \
--certificate-identity=https://github.com/chainguard-images/images/.github/workflows/release.yaml@refs/heads/main \
cgr.dev/chainguard/argo-workflowcontroller | jq
Production Images
cosign verify \
--certificate-oidc-issuer=https://token.actions.githubusercontent.com \
--certificate-identity=https://github.com/chainguard-images/images-private/.github/workflows/release.yaml@refs/heads/main \
cgr.dev/<your-org-name>/argo-workflowcontroller | jq
Downloading argo-workflowcontroller Image Attestations
The following attestations for the argo-workflowcontroller image can be obtained and verified via cosign:
Attestation Type | Description |
---|
https://slsa.dev/provenance/v1
| The SLSA 1.0 provenance attestation contains information about the image build environment. |
https://apko.dev/image-configuration
| Contains the configuration used by that particular image build, including direct dependencies, user accounts, and entry point. |
https://spdx.dev/Document
| Contains the image SBOM (Software Bill of Materials) in SPDX format. |
To download an attestation, use the cosign download attestation
command and provide both the predicate type and the build platform. For example, the following command will obtain the SBOM for the argo-workflowcontroller image on linux/amd64
:
Developer Images
cosign download attestation \
--platform=linux/amd64 \
--predicate-type=https://spdx.dev/Document \
cgr.dev/chainguard/argo-workflowcontroller | jq -r .payload | base64 -d | jq .predicate
Production Images
cosign download attestation \
--platform=linux/amd64 \
--predicate-type=https://spdx.dev/Document \
cgr.dev/<your-org-name>/argo-workflowcontroller | jq -r .payload | base64 -d | jq .predicate
By default, this command will fetch the SBOM assigned to the latest
tag. You can also specify the tag you want to fetch the attestation from.
To download a different attestation, replace the --predicate-type
parameter value with the desired attestation URL identifier.
Verifying argo-workflowcontroller Image Attestations
You can use the cosign verify-attestation
command to check the signatures of the argo-workflowcontroller image attestations:
Developer Images
cosign verify-attestation \
--type https://spdx.dev/Document \
--certificate-oidc-issuer=https://token.actions.githubusercontent.com \
--certificate-identity=https://github.com/chainguard-images/images/.github/workflows/release.yaml@refs/heads/main \
cgr.dev/chainguard/argo-workflowcontroller
Production Images
cosign verify-attestation \
--type https://spdx.dev/Document \
--certificate-oidc-issuer=https://token.actions.githubusercontent.com \
--certificate-identity=https://github.com/chainguard-images/images-private/.github/workflows/release.yaml@refs/heads/main \
cgr.dev/<your-org-name>/argo-workflowcontroller
This will pull in the signature for the attestation specified by the --type
parameter, which in this case is the SPDX attestation. You will receive output that verifies the SBOM attestation signature in cosign's transparency log:
Verification for cgr.dev/chainguard/argo-workflowcontroller --
The following checks were performed on each of these signatures:
- The cosign claims were validated
- Existence of the claims in the transparency log was verified offline
- The code-signing certificate was verified using trusted certificate authority certificates
Certificate subject: https://github.com/chainguard-images/images/.github/workflows/release.yaml@refs/heads/main
Certificate issuer URL: https://token.actions.githubusercontent.com
GitHub Workflow Trigger: schedule
GitHub Workflow SHA: da283c26829d46c2d2883de5ff98bee672428696
GitHub Workflow Name: .github/workflows/release.yaml
GitHub Workflow Trigger chainguard-images/images
GitHub Workflow Ref: refs/heads/main
...