CI check for missing TA Task variants

A script and a GitHub workflow change to check if a new Task was added
that uses a PVC-backed workspace without a Trusted Artifacts Task
variant.

Reference: https://issues.redhat.com/browse/EC-934

.github/workflows/check-ta.yaml

@@ -12,6 +12,9 @@ jobs:
       - name: Check Trusted Artifact variants
         id: check
         run: hack/generate-ta-tasks.sh
+      - name: Check missing Trusted Artifact variants
+        id: missing
+        run: hack/missing-ta-tasks.sh
       - name: Attach patch
         if: ${{ always() && steps.check.conclusion == 'failure' }}
         uses: actions/upload-artifact@v4

hack/missing-ta-tasks.sh

@@ -0,0 +1,106 @@
+#!/usr/bin/env bash
+
+set -o errexit
+set -o nounset
+set -o pipefail
+shopt -s globstar
+
+git_root=$(git rev-parse --show-toplevel)
+
+tmp_files=()
+trap 'rm "${tmp_files[@]}" > /dev/null 2>&1' EXIT
+
+# names of workspaces that will not be mounted via PVC, as inline array
+non_pvc_workspaces='["ssh-directory", "basic-auth", "gitops-auth", "git-basic-auth", "netrc"]'
+
+# Tasks that are currently missing Trusted Artifact variant
+todo=(
+  task/buildah-10gb/0.2/kustomization.yaml
+  task/buildah-20gb/0.2/kustomization.yaml
+  task/buildah-24gb/0.2/kustomization.yaml
+  task/buildah-6gb/0.2/kustomization.yaml
+  task/buildah-8gb/0.2/kustomization.yaml
+  task/buildah-min/0.2/kustomization.yaml
+  task/buildah-rhtap/0.1/buildah-rhtap.yaml
+  task/download-sbom-from-url-in-attestation/0.1/download-sbom-from-url-in-attestation.yaml
+  task/fbc-related-image-check/0.1/fbc-related-image-check.yaml
+  task/fbc-validation/0.1/fbc-validation.yaml
+  task/gather-deploy-images/0.1/gather-deploy-images.yaml
+  task/generate-odcs-compose/0.2/generate-odcs-compose.yaml
+  task/generate-odcs-compose/0.2/kustomization.yaml
+  task/inspect-image/0.1/inspect-image.yaml
+  task/operator-sdk-generate-bundle/0.1/operator-sdk-generate-bundle.yaml
+  task/opm-get-bundle-version/0.1/opm-get-bundle-version.yaml
+  task/opm-render-bundles/0.1/opm-render-bundles.yaml
+  task/sast-unicode-check/0.1/sast-unicode-check.yaml
+  task/tkn-bundle/0.1/tkn-bundle.yaml
+  task/upload-sbom-to-trustification/0.1/upload-sbom-to-trustification.yaml
+)
+
+emit() {
+  if [ "${GITHUB_ACTIONS:-false}" == "true" ]; then
+    printf "::error file=%s,line=1,col=0::%s\n" "$1" "$2"
+  else
+    printf "INFO: \033[1m%s\033[0m %s\n" "$1" "$2"
+  fi
+}
+
+{
+  cd "${git_root}"
+  missing=0
+  for task in task/**/*.yaml; do
+      task_file="${task}"
+      case "${task}" in
+          */kustomization.yaml)
+              tmp=$(mktemp)
+              tmp_files+=("${tmp}")
+              kustomize build "${task%/kustomization.yaml}" > "${tmp}"
+              task_file="${tmp}"
+              ;;
+          */recipe.yaml | */patch.yaml)
+              continue
+              ;;
+      esac
+
+      for t in "${todo[@]}"; do
+        [[ "${t}" == "${task}" ]] && continue 2
+      done
+
+      # we are looking at a Task
+      yq -e '.kind != "Task"' "${task_file}" > /dev/null 2>&1 && continue
+
+      # path elements of the task file path
+      readarray -d / paths <<< "${task}"
+      # PVC non-optional workspaces used
+      readarray -t workspaces <<< "$(yq '[.spec.workspaces[] | select(.optional != true) | .name] - '"${non_pvc_workspaces}"' | .[] | {"x": .} | "\(.x)"' "${task_file}")"
+
+      # is the task using a workspace(s) to share files?
+      [[ "${#workspaces}" -eq 0 ]] && continue
+
+      # is there a newer version of the task
+      base_task_path=("${paths[@]}")
+      unset 'base_task_path[-1]'
+      version="${base_task_path[-1]/\/}"
+      unset 'base_task_path[-1]'
+      for dir in $(IFS=''; echo "${base_task_path[*]}*"); do
+          [[ ! -d "${dir}" ]] && continue
+          [[ "${version}" < "${dir/*\/}" ]] && continue 2
+      done
+
+      # there is no Trusted Artifacts variant of the task
+      unset 'paths[-1]'
+      paths[-2]="${paths[-2]%/}-oci-ta/"
+      ta_dir="$(IFS=''; echo "${paths[*]}")"
+      if [[ ! -d "${ta_dir}" ]]; then
+          emit "${task}" "Task is using a workspace(s): ${workspaces[*]}, to share data and needs a corresponding Trusted Artifacts Task variant in ${ta_dir}"
+          missing=$((missing + 1))
+      fi
+  done
+
+  if [[ ${missing} -gt 0 ]]; then
+    if [ "${GITHUB_ACTIONS:-false}" == "true" ]; then
+      echo '::notice title=Missing Trusted Artifact Task Variant::Found Tasks that share data via PersistantVolumeClaim volumes without a corresponding Trusted Artifacts Variant. Please create the Trusted Artifacts Variant of the Task as well'
+      exit 1
+    fi
+  fi
+}