circleci totally change config.yaml

circle.yml

@@ -1,32 +1,21 @@
-machine:
-  environment:
-    CC: gcc
-    CXX: g++
-    GOPATH: /home/ubuntu/.go_workspace
-    GOVER: 1.7.1
-    GOTAR: /home/ubuntu/go${GOVER}.linux-amd64.tar.gz
-  post:
-    - echo $GOVER
-    - mkdir -p ${GOPATH%%:*}/src/github.com/${CIRCLE_PROJECT_USERNAME}
-    - rm -rf ${GOPATH%%:*}/src/github.com/${CIRCLE_PROJECT_USERNAME}/*
-    - ln -sf ~/${CIRCLE_PROJECT_REPONAME} ${GOPATH%%:*}/src/github.com/${CIRCLE_PROJECT_USERNAME}/${CIRCLE_PROJECT_REPONAME}
-general:
-  build_dir: ../.go_workspace/src/github.com/${CIRCLE_PROJECT_USERNAME}/${CIRCLE_PROJECT_REPONAME}
-dependencies:
-  cache_directories:
-    - ~/go1.7.1.linux-amd64.tar.gz
-  pre:
-    - echo "GOVER $GOVER"
-    - echo "GOTAR $GOTAR"
-    - go version
-    - test -e ${GOTAR} || wget https://storage.googleapis.com/golang/go${GOVER}.linux-amd64.tar.gz -O ${GOTAR}
-    - go version | grep "$GOVER " || (sudo rm -rf /usr/local/go; sudo tar -C /usr/local -xzf ${GOTAR})
-    - go version
-  post:
-    - go env
-    - pwd
-    - go get golang.org/x/net/context
-    - go test -i -race $(go list -f '{{if len .TestGoFiles}}{{.ImportPath}}{{end}}' ./... | grep -v /vendor/)
-test:
-  override:
-    - go test -race $(go list -f '{{if len .TestGoFiles}}{{.ImportPath}}{{end}}' ./... | grep -v /vendor/)
+version: 2.1
+jobs:
+  build:
+    docker:
+      - image: 'cimg/go:1.15.3'
+        # auth:
+        #   username: mydockerhub-user
+        #   password: $DOCKERHUB_PASSWORD
+        environment:
+          CC: gcc
+          CXX: g++
+          GOPATH: /home/ubuntu/.go_workspace
+          GOVER: 1.7.1
+          GOTAR: /home/ubuntu/go${GOVER}.linux-amd64.tar.gz
+    steps:
+      - checkout
+      - run:
+        - go version
+        - test -e ${GOTAR} || wget https://storage.googleapis.com/golang/go${GOVER}.linux-amd64.tar.gz -O ${GOTAR}
+        - go get golang.org/x/net/context
+        - go test -i -race $(go list -f '{{if len .TestGoFiles}}{{.ImportPath}}{{end}}' ./... | grep -v /vendor/)