chore(ci): prevent duplicate 'automerge' creation — use existing label id only (auto-label/auto-pr)

Reviewed-on: #5

.gitea/workflows/auto-label.yml

@@ -0,0 +1,37 @@
+name: Auto Label PR
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+jobs:
+  add-automerge-label:
+    runs-on: [macos, host]
+    steps:
+      - name: Add 'automerge' label to PR
+        env:
+          CI_TOKEN: ${{ secrets.CI_TOKEN }}
+          GITEA_BASE_URL: https://gitea.jaybe.dev
+          PR_NUMBER: ${{ github.event.pull_request.number }}
+          REPO: ${{ github.repository }}
+        run: |
+          set -euo pipefail
+          if [ -z "${CI_TOKEN:-}" ]; then
+            echo "CI_TOKEN not set; skipping labeling"; exit 0; fi
+          OWNER=$(echo "$REPO" | cut -d'/' -f1)
+          NAME=$(echo "$REPO" | cut -d'/' -f2)
+          echo "Resolving existing label id for 'automerge' in $OWNER/$NAME (no creation)"
+          curl -sS -o /tmp/labels.json -H "Authorization: token ${CI_TOKEN}" \
+            "${GITEA_BASE_URL}/api/v1/repos/${OWNER}/${NAME}/labels?limit=1000" || true
+          # Extract all ids whose name == automerge, prefer the smallest id (oldest)
+          LID=$(tr '\n' ' ' < /tmp/labels.json | \
+            grep -o '"id":[0-9][0-9]*[^\}]*"name":"automerge"' | \
+            sed -E 's/.*"id":([0-9]+).*/\1/' | sort -n | head -n1 || true)
+          if [ -z "${LID:-}" ]; then
+            echo "No existing 'automerge' label found; skipping labeling"; exit 0; fi
+          echo "Labeling PR #$PR_NUMBER with id $LID"
+          curl -sS -X POST \
+            -H "Content-Type: application/json" \
+            -H "Authorization: token ${CI_TOKEN}" \
+            "${GITEA_BASE_URL}/api/v1/repos/${OWNER}/${NAME}/issues/${PR_NUMBER}/labels" \
+            -d '{"labels":['"${LID}"']}' || true

.gitea/workflows/auto-pr.yml

@@ -33,6 +33,44 @@ jobs:
           echo "API status: $HTTP_CODE"
           if [ "$HTTP_CODE" = "201" ]; then
             echo "PR created"; cat /tmp/pr_resp.json
+            PR_NUMBER=$(cat /tmp/pr_resp.json | sed -n 's/.*"number":\([0-9]*\).*/\1/p' | head -n1)
           else
             echo "PR not created (possibly exists). Response:"; cat /tmp/pr_resp.json || true
           fi
+
+          # Retry to resolve PR number by listing open PRs and matching head/base
+          i=0
+          while [ -z "${PR_NUMBER:-}" ] && [ $i -lt 10 ]; do
+            i=$((i+1))
+            echo "[retry $i] Resolving PR number for $HEAD_BRANCH -> $BASE_BRANCH"
+            curl -sS -o /tmp/pr_list.json -H "Authorization: token ${CI_TOKEN}" \
+              "${GITEA_BASE_URL}/api/v1/repos/${OWNER}/${NAME}/pulls?state=open" || true
+            # Extract PR number matching head.ref==HEAD_BRANCH and base.ref==BASE_BRANCH
+            PR_NUMBER=$(awk -v hb="$HEAD_BRANCH" -v bb="$BASE_BRANCH" 'BEGIN{RS="},"; pr=""} {
+              if($0 ~ /\"head\":\{[^}]*\"ref\":\"" hb "\"/ && $0 ~ /\"base\":\{[^}]*\"ref\":\"" bb "\"/){
+                if (match($0, /\"number\":([0-9]+)/, m)) { print m[1]; exit }
+              }
+            }' /tmp/pr_list.json)
+            if [ -z "${PR_NUMBER:-}" ]; then sleep 2; fi
+          done
+
+          if [ -n "${PR_NUMBER:-}" ]; then
+            echo "Resolving existing label id for 'automerge' (no creation)"
+            curl -sS -o /tmp/labels.json -H "Authorization: token ${CI_TOKEN}" \
+              "${GITEA_BASE_URL}/api/v1/repos/${OWNER}/${NAME}/labels?limit=1000" || true
+            LID=$(tr '\n' ' ' < /tmp/labels.json | \
+              grep -o '"id":[0-9][0-9]*[^\}]*"name":"automerge"' | \
+              sed -E 's/.*"id":([0-9]+).*/\1/' | sort -n | head -n1 || true)
+            if [ -n "${LID:-}" ]; then
+              echo "Adding 'automerge' (id=$LID) label to PR #$PR_NUMBER"
+              curl -sS -X POST \
+                -H "Content-Type: application/json" \
+                -H "Authorization: token ${CI_TOKEN}" \
+                "${GITEA_BASE_URL}/api/v1/repos/${OWNER}/${NAME}/issues/${PR_NUMBER}/labels" \
+                -d '{"labels":['"${LID}"']}' || true
+            else
+              echo "No existing 'automerge' label found; skipping label add"
+            fi
+          else
+            echo "PR number could not be determined; skipping label add"
+          fi

.gitea/workflows/ci.yml

@@ -56,10 +56,27 @@ jobs:
             echo "CI_TOKEN not set; skipping auto-merge"; exit 0; fi
           OWNER=$(echo "$REPO" | cut -d'/' -f1)
           NAME=$(echo "$REPO" | cut -d'/' -f2)
+          echo "Checking labels for PR #$PR_NUMBER on $OWNER/$NAME"
+          LABELS_JSON=$(curl -sS -X GET \
+            -H "Authorization: token ${CI_TOKEN}" \
+            "${GITEA_BASE_URL}/api/v1/repos/${OWNER}/${NAME}/issues/${PR_NUMBER}")
+          echo "labels payload (first 200 chars):"; echo "$LABELS_JSON" | cut -c1-200 || true
+          if ! echo "$LABELS_JSON" | grep -qi '"name":"automerge"'; then
+            echo "Label 'automerge' not present; skipping merge"; exit 0; fi
+          echo "Label 'automerge' present; proceeding to merge"
+          # ensure PR is open
+          PR_JSON=$(curl -sS -X GET \
+            -H "Authorization: token ${CI_TOKEN}" \
+            "${GITEA_BASE_URL}/api/v1/repos/${OWNER}/${NAME}/pulls/${PR_NUMBER}")
+          STATE=$(echo "$PR_JSON" | sed -n 's/.*"state":"\([^"]*\)".*/\1/p')
+          echo "PR state: ${STATE:-unknown}"
+          if [ "${STATE:-}" != "open" ]; then
+            echo "PR state is not open; skipping merge"; exit 0; fi
           echo "Merging PR #$PR_NUMBER for $OWNER/$NAME"
-          RESP=$(curl -sS -X POST \
+          HTTP_CODE=$(curl -sS -o /tmp/merge_resp.json -w "%{http_code}" -X POST \
             -H "Content-Type: application/json" \
             -H "Authorization: token ${CI_TOKEN}" \
             "${GITEA_BASE_URL}/api/v1/repos/${OWNER}/${NAME}/pulls/${PR_NUMBER}/merge" \
             -d '{"Do":"merge","MergeMessage":"auto-merge: CI green"}' || true)
-          echo "API response: $RESP"
+          echo "merge http: $HTTP_CODE"
+          echo "merge resp:"; cat /tmp/merge_resp.json || true