refactor progress

.github/workflows/channel-vars.yaml

@@ -8,15 +8,9 @@ on:
       github_ref_name:
         type: string
         required: false
-      github_ref:
-        type: string
-        required: false
       workflow_dispatch_channel:
         type: string
         required: false
-      workflow_dispatch_ref:
-        type: string
-        required: false
 
     outputs:
       channel:
@@ -25,9 +19,6 @@ on:
       is_canary:
         description: 'Whether this is a canary deploy (true|false)'
         value: ${{ jobs.emit.outputs.is_canary }}
-      source_ref:
-        description: 'Git ref to check out for the deploy'
-        value: ${{ jobs.emit.outputs.source_ref }}
       stack_suffix:
         description: "Suffix for stack/image names ('' or '-canary')"
         value: ${{ jobs.emit.outputs.stack_suffix }}
@@ -35,60 +26,23 @@ on:
 jobs:
   emit:
     runs-on: ubuntu-latest
+    timeout-minutes: 25
     outputs:
       channel: ${{ steps.compute.outputs.channel }}
       is_canary: ${{ steps.compute.outputs.is_canary }}
-      source_ref: ${{ steps.compute.outputs.source_ref }}
       stack_suffix: ${{ steps.compute.outputs.stack_suffix }}
     steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+        with:
+          sparse-checkout: scripts/ci
+          sparse-checkout-cone-mode: false
+
       - name: Determine channel
         id: compute
         shell: bash
-        run: |
-          set -euo pipefail
-
-          event_name="${{ inputs.github_event_name }}"
-          ref_name="${{ inputs.github_ref_name || '' }}"
-          ref="${{ inputs.github_ref || '' }}"
-          dispatch_channel="${{ inputs.workflow_dispatch_channel || '' }}"
-          dispatch_ref="${{ inputs.workflow_dispatch_ref || '' }}"
-
-          channel="stable"
-          if [[ "${event_name}" == "push" ]]; then
-            if [[ "${ref_name}" == "canary" ]]; then
-              channel="canary"
-            fi
-          else
-            if [[ "${dispatch_channel}" == "canary" ]]; then
-              channel="canary"
-            fi
-          fi
-
-          if [[ "${event_name}" == "push" ]]; then
-            source_ref="${ref:-refs/heads/${ref_name:-main}}"
-          else
-            if [[ -n "${dispatch_ref}" ]]; then
-              source_ref="${dispatch_ref}"
-            else
-              if [[ "${channel}" == "canary" ]]; then
-                source_ref="refs/heads/canary"
-              else
-                source_ref="refs/heads/main"
-              fi
-            fi
-          fi
-
-          stack_suffix=""
-          if [[ "${channel}" == "canary" ]]; then
-            stack_suffix="-canary"
-          fi
-
-          is_canary="false"
-          if [[ "${channel}" == "canary" ]]; then
-            is_canary="true"
-          fi
-
-          printf 'channel=%s\n' "${channel}" >> "$GITHUB_OUTPUT"
-          printf 'is_canary=%s\n' "${is_canary}" >> "$GITHUB_OUTPUT"
-          printf 'source_ref=%s\n' "${source_ref}" >> "$GITHUB_OUTPUT"
-          printf 'stack_suffix=%s\n' "${stack_suffix}" >> "$GITHUB_OUTPUT"
+        run: >-
+          python3 scripts/ci/workflows/channel_vars.py
+          --event-name "${{ inputs.github_event_name }}"
+          --ref-name "${{ inputs.github_ref_name || '' }}"
+          --dispatch-channel "${{ inputs.workflow_dispatch_channel || '' }}"