CircleCI: autocancel workflows (#915)

.circleci/autocancel.sh

@@ -0,0 +1,38 @@
+#!/bin/bash
+
+# Auto-cancel preceding workflows
+# https://discuss.circleci.com/t/workaround-auto-cancel-redundant-builds-on-the-default-branch/39468
+
+set -x
+
+## Get the name of the workflow and the related pipeline number
+curl --header "Circle-Token: $PERS_API_TOKEN_BOOST_5" --request GET "https://circleci.com/api/v2/workflow/${CIRCLE_WORKFLOW_ID}" -o current_workflow.json
+WF_NAME=$(jq -r '.name' current_workflow.json)
+CURRENT_PIPELINE_NUM=$(jq -r '.pipeline_number' current_workflow.json)
+CURRENT_PIPELINE_CREATED=$(jq -r '.created_at' current_workflow.json)
+TIME_THRESHOLD=$(date --utc +'%Y-%m-%dT%TZ' -d "${CURRENT_PIPELINE_CREATED} -10 minutes")
+
+## Get the IDs of pipelines created by the current user on the same branch. (Only consider pipelines that have a pipeline number inferior to the current pipeline)
+PIPE_IDS=$(curl --header "Circle-Token: $PERS_API_TOKEN_BOOST_5" --request GET "https://circleci.com/api/v2/project/gh/$CIRCLE_PROJECT_USERNAME/$CIRCLE_PROJECT_REPONAME/pipeline?branch=$CIRCLE_BRANCH"|jq -r --argjson CURRENT_PIPELINE_NUM "$CURRENT_PIPELINE_NUM" --arg TIME_THRESHOLD "${TIME_THRESHOLD}" '.items[] | select(.state == "created") | select(.number < $CURRENT_PIPELINE_NUM) | select(.created_at > $TIME_THRESHOLD) | .id')
+
+## Get the IDs of currently running/on_hold workflows that have the same name as the current workflow, in all previously created pipelines.
+if [ ! -z "$PIPE_IDS" ]; then
+  for PIPE_ID in $PIPE_IDS
+  do
+    curl --header "Circle-Token: $PERS_API_TOKEN_BOOST_5" --request GET "https://circleci.com/api/v2/pipeline/${PIPE_ID}/workflow"|jq -r --arg WF_NAME "${WF_NAME}" '.items[]|select(.status == "on_hold" or .status == "running") | select(.name == $WF_NAME) | .id' >> WF_to_cancel.txt
+  done
+fi
+
+## Cancel any currently running/on_hold workflow with the same name
+if [ -s WF_to_cancel.txt ]; then
+  echo "Cancelling the following workflow(s):"
+  cat WF_to_cancel.txt
+  while read WF_ID;
+    do
+      curl --header "Circle-Token: $PERS_API_TOKEN_BOOST_5" --request POST https://circleci.com/api/v2/workflow/$WF_ID/cancel
+    done < WF_to_cancel.txt
+  ## Allowing some time to complete the cancellation
+  sleep 2
+  else
+    echo "Nothing to cancel"
+fi

.circleci/config.yml

@@ -1,11 +1,12 @@
-version: 2
+version: 2.1
 jobs:
   build:
     docker:
-      - image: cppalliance/boost_superproject_build:20.04-v4
+      - image: cppalliance/boost_superproject_build:22.04-v1
     parallelism: 2
     steps:
       - checkout
+      - run: ./.circleci/autocancel.sh || true
       - run: wget "https://raw.githubusercontent.com/boostorg/release-tools/master/ci_boost_common.py" -P ${HOME}
       - run: wget "https://raw.githubusercontent.com/boostorg/release-tools/master/ci_boost_release.py" -P ${HOME}
       - run: python3 ${HOME}/ci_boost_release.py checkout_post