[CI] add check_tags CI job (#1072)

* add check_tags CI job

* fix typo in gitlab-ci.yml

* add more useful CI output

* Make presence of github token optional

polkadot/.gitlab-ci.yml

@@ -73,7 +73,16 @@ variables:
     - /^v[0-9]+\.[0-9]+.*$/        # i.e. v1.0, v2.1rc1
     - /^[0-9]+$/
 
+#### stage:                       .pre
 
+check-labels:
+  stage:                          .pre
+  image:                          parity/tools:latest
+  <<:                             *kubernetes-env
+  only:
+    - /^[0-9]+$/
+  script:
+    - ./scripts/gitlab/check_tags.sh
 
 #### stage:                        test
 

polkadot/scripts/gitlab/check_tags.sh

+#!/usr/bin/env bash
+
+#shellcheck source=lib.sh
+source "$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )/lib.sh"
+
+# Must have one of the following labels
+labels=(
+  'B1-releasenotes'
+  'B1-runtimeworthy'
+  'B1-silent'
+)
+
+echo "[+] Checking labels for $CI_COMMIT_BRANCH"
+
+for label in "${labels[@]}"; do
+  if has_label 'paritytech/polkadot' "$CI_COMMIT_BRANCH" "$label"; then
+    echo "[+] Label $label detected, test passed"
+    exit 0
+  fi
+done
+
+echo "[!] PR does not have one of the required labels! Please add one of: ${labels[*]}"
+exit 1

polkadot/scripts/gitlab/lib.sh

@@ -21,7 +21,11 @@ sanitised_git_logs(){
 check_tag () {
   repo=$1
   tagver=$2
-  tag_out=$(curl -H "Authorization: token $GITHUB_RELEASE_TOKEN" -s "$api_base/$repo/git/refs/tags/$tagver")
+  if [ -n "$GITHUB_RELEASE_TOKEN" ]; then
+    tag_out=$(curl -H "Authorization: token $GITHUB_RELEASE_TOKEN" -s "$api_base/$repo/git/refs/tags/$tagver")
+  else
+    tag_out=$(curl -s "$api_base/$repo/git/refs/tags/$tagver")
+  fi
   tag_sha=$(echo "$tag_out" | jq -r .object.sha)
   object_url=$(echo "$tag_out" | jq -r .object.url)
   if [ "$tag_sha" = "null" ]; then
@@ -46,7 +50,11 @@ has_label(){
   repo="$1"
   pr_id="$2"
   label="$3"
-  out=$(curl -H "Authorization: token $GITHUB_RELEASE_TOKEN" -s "$api_base/$repo/pulls/$pr_id")
+  if [ -n "$GITHUB_RELEASE_TOKEN" ]; then
+    out=$(curl -H "Authorization: token $GITHUB_RELEASE_TOKEN" -s "$api_base/$repo/pulls/$pr_id")
+  else
+    out=$(curl -s "$api_base/$repo/pulls/$pr_id")
+  fi
   [ -n "$(echo "$out" | tr -d '\r\n' | jq ".labels | .[] | select(.name==\"$label\")")" ]
 }