WIP: k3d composite action

Author: cbandy

.github/actions/k3d/action.yaml

@@ -0,0 +1,85 @@
+name: k3d
+description: Start k3s using k3d
+inputs:
+  k3d-tag:
+    default: latest
+    required: true
+    description: >
+      Git tag from https://github.com/rancher/k3d/releases or "latest"
+  k3s-channel:
+    default: latest
+    required: true
+    description: >
+      https://rancher.com/docs/k3s/latest/en/upgrades/basic/#release-channels
+  prefetch-images:
+    required: true
+    description: >
+      Each line is the name of an image to fetch onto all Kubernetes nodes
+  prefetch-timeout:
+    default: 90s
+    required: true
+    description: >
+      Amount of time to wait for images to be fetched
+
+outputs:
+  kubernetes-version:
+    value: ${{ steps.k3s.outputs.server }}
+    description: >
+      Kubernetes server version, as reported by the Kubernetes API
+
+runs:
+  using: composite
+  steps:
+    - id: k3d
+      name: Install k3d
+      shell: bash
+      env:
+        K3D_TAG: ${{ inputs.k3d-tag }}
+      run: |
+        curl --fail --silent https://raw.githubusercontent.com/rancher/k3d/main/install.sh |
+          TAG="${K3D_TAG#latest}" bash
+        k3d version | awk '{ print "::set-output name=" tolower($1) "::" $3 }'
+
+    - id: k3s
+      name: Start k3s
+      shell: bash
+      run: |
+        k3d cluster create --image '+${{ inputs.k3s-channel }}' --no-lb --timeout=2m --wait
+        kubectl version --short | awk '{ print "::set-output name=" tolower($1) "::" $3 }'
+
+        docker exec $(k3d node list --output json | jq --raw-output 'first.name') \
+          k3s agent --help | awk '$1 == "--pause-image" {
+            match($0, /default: "[^"]*"/)
+            print "::set-output name=pause-image::" substr($0, RSTART+10, RLENGTH-11)
+          }'
+
+    - name: Prefetch container images
+      shell: bash
+      env:
+        INPUT_IMAGES:  ${{ inputs.prefetch-images  }}
+        INPUT_TIMEOUT: ${{ inputs.prefetch-timeout }}
+      run: |
+        jq <<< "$INPUT_IMAGES" --raw-input 'select(. != "")' |
+        jq --slurp \
+          --arg pause '${{ steps.k3s.outputs.pause-image }}' \
+          --argjson labels '{"name":"image-prefetch"}' \
+          --argjson name '"image-prefetch"' \
+        '{
+          apiVersion: "apps/v1", kind: "DaemonSet",
+          metadata: { name: $name, labels: $labels },
+          spec: {
+            selector: { matchLabels: $labels },
+            template: {
+              metadata: { labels: $labels },
+              spec: {
+                initContainers: to_entries | map({
+                  name: "c\(.key)", image: .value, command: ["true"],
+                }),
+                containers: [{ name: "pause", image: $pause }]
+              }
+            }
+          }
+        }' |
+        kubectl create --filename=-
+        kubectl rollout status daemonset.apps/image-prefetch --timeout "$INPUT_TIMEOUT" ||
+        kubectl describe daemonset.apps/image-prefetch

.github/workflows/test.yaml

@@ -56,43 +56,15 @@ jobs:
       - uses: actions/setup-go@v3
         with: { go-version: 1.x }
 
-      - name: Install k3d
-        # Git tag from https://github.com/rancher/k3d/releases or "latest"
-        env: { K3D_TAG: latest }
-        run: |
-          curl --fail --silent https://raw.githubusercontent.com/rancher/k3d/main/install.sh |
-            TAG="${K3D_TAG#latest}" bash && k3d version | head -n1
-
       - name: Start k3s
-        # https://rancher.com/docs/k3s/latest/en/upgrades/basic/#release-channels
-        env: { K3S_CHANNEL: "${{ matrix.kubernetes }}" }
-        run: k3d cluster create --image="+${K3S_CHANNEL}" --no-lb --timeout=2m --wait
+        uses: ./.github/actions/k3d
+        with:
+          k3s-channel: "${{ matrix.kubernetes }}"
+          prefetch-images: |
+            registry.developers.crunchydata.com/crunchydata/crunchy-postgres:ubi8-13.6-1
+            registry.developers.crunchydata.com/crunchydata/crunchy-pgbackrest:ubi8-2.38-0
+            registry.developers.crunchydata.com/crunchydata/crunchy-pgbouncer:ubi8-1.16-2
 
-      - name: Prefetch container images
-        run: |
-          {
-            echo '"registry.developers.crunchydata.com/crunchydata/crunchy-postgres:ubi8-13.6-1"'
-            echo '"registry.developers.crunchydata.com/crunchydata/crunchy-pgbackrest:ubi8-2.38-0"'
-            echo '"registry.developers.crunchydata.com/crunchydata/crunchy-pgbouncer:ubi8-1.16-2"'
-          } |
-          jq --slurp --arg name 'image-prefetch' --argjson labels '{"name":"image-prefetch"}' '{
-            apiVersion: "apps/v1", kind: "DaemonSet",
-            metadata: { name: $name, labels: $labels },
-            spec: {
-              selector: { matchLabels: $labels },
-              template: {
-                metadata: { labels: $labels },
-                spec: {
-                  initContainers: to_entries | map({ name: "c\(.key)", command: ["true"], image: .value }),
-                  containers: [{ name: "pause", image: "k8s.gcr.io/pause:3.5" }]
-                }
-              }
-            }
-          }' |
-          kubectl create --filename=- && {
-            kubectl rollout status daemonset.apps/image-prefetch --timeout=90s ||
-            kubectl describe daemonset.apps/image-prefetch
-          }
       - run: make createnamespaces check-envtest-existing
         env:
           PGO_TEST_TIMEOUT_SCALE: 1.2