chore: utilise do-exclusively on eks testing

run the eks integration test only once concurrently, because the same environment is used, and multiple tests will interrupt each other.

Author: Shesekino

.circleci/config.yml

@@ -188,7 +188,7 @@ jobs:
             export IMAGE_TAG=$([[ "$CIRCLE_BRANCH" == "staging" ]] && echo "staging-candidate" || echo "discardable") &&
             export KUBERNETES_MONITOR_IMAGE_NAME_AND_TAG=snyk/kubernetes-monitor:${IMAGE_TAG}-${CIRCLE_SHA1} &&
             docker pull ${KUBERNETES_MONITOR_IMAGE_NAME_AND_TAG} &&
-            npm run test:integration:eks
+            .circleci/do-exclusively --branch staging npm run test:integration:eks
       - run:
           name: Notify Slack on failure
           command: |

.circleci/do-exclusively

@@ -0,0 +1,84 @@
+#!/usr/bin/env bash
+
+# copied from https://github.com/bellkev/circle-lock-test
+
+# sets $branch, $tag, $rest
+parse_args() {
+    while [[ $# -gt 0 ]]; do
+        case $1 in
+            -b|--branch) branch="$2" ;;
+            -t|--tag) tag="$2" ;;
+            *) break ;;
+        esac
+        shift 2
+    done
+    rest=("$@")
+}
+
+# reads $branch, $tag, $commit_message
+should_skip() {
+    if [[ "$branch" && "$CIRCLE_BRANCH" != "$branch" ]]; then
+        echo "Not on branch $branch. Skipping..."
+        return 0
+    fi
+
+    if [[ "$tag" && "$commit_message" != *\[$tag\]* ]]; then
+        echo "No [$tag] commit tag found. Skipping..."
+        return 0
+    fi
+
+    return 1
+}
+
+# reads $branch, $tag
+# sets $jq_prog
+make_jq_prog() {
+    local jq_filters=""
+
+    if [[ $branch ]]; then
+        jq_filters+=" and .branch == \"$branch\""
+    fi
+
+    if [[ $tag ]]; then
+        jq_filters+=" and (.subject | contains(\"[$tag]\"))"
+    fi
+
+    jq_prog=".[] | select(.build_num < $CIRCLE_BUILD_NUM and (.status | test(\"running|pending|queued\")) $jq_filters) | .build_num"
+}
+
+
+if [[ "$0" != *bats* ]]; then
+set -e
+set -u
+set -o pipefail
+
+    branch=""
+    tag=""
+    rest=()
+    api_url="https://circleci.com/api/v1/project/$CIRCLE_PROJECT_USERNAME/$CIRCLE_PROJECT_REPONAME?circle-token=$CIRCLE_TOKEN&limit=100"
+
+    parse_args "$@"
+    commit_message=$(git log -1 --pretty=%B)
+    if should_skip; then exit 0; fi
+    make_jq_prog
+
+    echo "Checking for running builds..."
+
+    while true; do
+        builds=$(curl -s -H "Accept: application/json" "$api_url" | jq "$jq_prog")
+        if [[ $builds ]]; then
+            echo "Waiting on builds:"
+            echo "$builds"
+        else
+            break
+        fi
+        echo "Retrying in 5 seconds..."
+        sleep 5
+    done
+
+    echo "Acquired lock"
+
+    if [[ "${#rest[@]}" -ne 0 ]]; then
+        "${rest[@]}"
+    fi
+fi