Fix release pipeline to handle tektoncd#1122

Since tektoncd#1122, we do not treat outputs that were inputs as well in any
special way, meaning that the output folder will be empty unless we
copy the input to the output.

Fix the release pipeline to handle that.

tekton/README.md

@@ -117,7 +117,7 @@ To use [`tkn`](https:/tektoncd/cli) to run the `publish-tekton-pipel
  --resource=builtWebhookImage=webhook-image \
  --resource=builtDigestExporterImage=digest-exporter-image \
  --resource=builtPullRequestInitImage=pull-request-init-image \
- --resource=builtGcsFetcherImage=gcs-fetcher-image \
+  --resource=builtGcsFetcherImage=gcs-fetcher-image \
  pipeline-release
  ```
 

tekton/publish.yaml

@@ -87,13 +87,21 @@ spec:
 
  cat /workspace/go/src/github.com/tektoncd/pipeline/.ko.yaml
 
+ - name: link-input-bucket-to-output
+ image: busybox
+ command: ["cp"]
+ args:
+ - -r
+ - "/workspace/bucket"
+ - "/workspace/output/"
+
  - name: ensure-release-dirs-exist
  image: busybox
  command: ["mkdir"]
  args:
  - "-p"
- - "/workspace/bucket/latest/"
- - "/workspace/bucket/previous/"
+ - "/workspace/output/bucket/latest/"
+ - "/workspace/output/bucket/previous/"
 
  - name: run-ko
  # TODO(#639) we should be able to use the image built by an upstream Task here instead of hardcoding
@@ -123,14 +131,14 @@ spec:
  cd /workspace/go/src/github.com/tektoncd/pipeline
 
  # Publish images and create release.yaml
- ko resolve --preserve-import-paths -f /workspace/go/src/github.com/tektoncd/pipeline/config/ > /workspace/bucket/latest/release.yaml
+ ko resolve --preserve-import-paths -f /workspace/go/src/github.com/tektoncd/pipeline/config/ > /workspace/output/bucket/latest/release.yaml
  volumeMounts:
  - name: gcp-secret
  mountPath: /secret
 
  - name: copy-to-tagged-bucket
  image: busybox
- workingDir: "/workspace/bucket"
+ workingDir: "/workspace/output/bucket"
  command:
  - /bin/sh
  args:
@@ -139,8 +147,8 @@ spec:
  set -e
  set -x
 
- mkdir -p /workspace/bucket/previous/$(inputs.params.versionTag)/
- cp /workspace/bucket/latest/release.yaml /workspace/bucket/previous/$(inputs.params.versionTag)/release.yaml
+ mkdir -p /workspace/output/bucket/previous/$(inputs.params.versionTag)/
+ cp /workspace/output/bucket/latest/release.yaml /workspace/output/bucket/previous/$(inputs.params.versionTag)/release.yaml
 
  - name: tag-images
  image: google/cloud-sdk
@@ -168,7 +176,7 @@ spec:
  ${inputs.params.imageRegistry}/${inputs.params.pathToProject}/${outputs.resources.builtGcsFetcherImage.url}
  )
  # Parse the built images from the release.yaml generated by ko
- BUILT_IMAGES=( $(/workspace/go/src/github.com/tektoncd/pipeline/tekton/koparse/koparse.py --path /workspace/bucket/latest/release.yaml --base ${inputs.params.imageRegistry}/${inputs.params.pathToProject} --images ${IMAGES[@]}) )
+ BUILT_IMAGES=( $(/workspace/go/src/github.com/tektoncd/pipeline/tekton/koparse/koparse.py --path /workspace/output/bucket/latest/release.yaml --base ${inputs.params.imageRegistry}/${inputs.params.pathToProject} --images ${IMAGES[@]}) )
 
  # Auth with account credentials
  gcloud auth activate-service-account --key-file=/secret/release.json