ci: pull cache from dev branch if one doesn't exist for current

Author: TomAFrench

.circleci/config.yml

@@ -1,7 +1,7 @@
 version: 2.1
 
 orbs:
-  welcome: circleci/[email protected]
+    welcome: circleci/[email protected]
 
 jobs:
     build:
@@ -11,63 +11,64 @@ jobs:
         steps:
             - checkout
             - run:
-                name: "Update NPM"
-                command: sudo npm install -g [email protected]
+                  name: 'Update NPM'
+                  command: sudo npm install -g [email protected]
             - run:
-                name: "Update Yarn"
-                command: yarn policies set-version 1.22.4
+                  name: 'Update Yarn'
+                  command: yarn policies set-version 1.22.4
             - run:
-                name: "Set caching variables"
-                command: |
-                  LAST_SUCCESSFUL_BUILD_URL="https://circleci.com/api/v1.1/project/github/$CIRCLE_PROJECT_USERNAME/$CIRCLE_PROJECT_REPONAME/tree/dev?filter=successful&limit=1"
-                  LAST_SUCCESSFUL_COMMIT=`curl -Ss -u "$CIRCLE_TOKEN:" $LAST_SUCCESSFUL_BUILD_URL | jq -r '.[0]["vcs_revision"]'`
-                  echo $LAST_SUCCESSFUL_COMMIT > /tmp/last-successful-commit
-                  echo $CIRCLE_SHA1 > /tmp/current-commit
+                  name: 'Set caching variables'
+                  command: |
+                      LAST_SUCCESSFUL_BUILD_URL="https://circleci.com/api/v1.1/project/github/$CIRCLE_PROJECT_USERNAME/$CIRCLE_PROJECT_REPONAME/tree/dev?filter=successful&limit=1"
+                      LAST_SUCCESSFUL_COMMIT=`curl -Ss -u "$CIRCLE_TOKEN:" $LAST_SUCCESSFUL_BUILD_URL | jq -r '.[0]["vcs_revision"]'`
+                      echo $LAST_SUCCESSFUL_COMMIT > /tmp/last-successful-commit
+                      echo $CIRCLE_SHA1 > /tmp/current-commit
             - restore_cache:
-                keys:
-                    - build-cache-{{ .Branch }}-{{ checksum "/tmp/last-successful-commit" }}
+                  keys:
+                      - build-cache-{{ .Branch }}-{{ checksum "/tmp/last-successful-commit" }}
+                      - build-cache-dev-{{ checksum "/tmp/last-successful-commit" }}
             - run:
-                name: "Install Dependencies"
-                command: yarn install
+                  name: 'Install Dependencies'
+                  command: yarn install
             - run:
-                name: "Build Packages"
-                command: yarn build
+                  name: 'Build Packages'
+                  command: yarn build
             - save_cache:
-                key: repo-{{ .Environment.CIRCLE_SHA1 }}
-                paths:
-                    - ~/repo
+                  key: repo-{{ .Environment.CIRCLE_SHA1 }}
+                  paths:
+                      - ~/repo
             - save_cache:
-                key: build-cache-{{ .Branch }}-{{ checksum "/tmp/current-commit" }}
-                paths:
-                    - ~/repo/packages/contract-artifacts/node_modules
-                    - ~/repo/packages/contract-artifacts/lib
-                    - ~/repo/packages/contracts/node_modules
-                    - ~/repo/packages/dev-utils/node_modules
-                    - ~/repo/packages/react-app/node_modules
-                    - ~/repo/packages/subgraph/node_modules
+                  key: build-cache-{{ .Branch }}-{{ checksum "/tmp/current-commit" }}
+                  paths:
+                      - ~/repo/packages/contract-artifacts/node_modules
+                      - ~/repo/packages/contract-artifacts/lib
+                      - ~/repo/packages/contracts/node_modules
+                      - ~/repo/packages/dev-utils/node_modules
+                      - ~/repo/packages/react-app/node_modules
+                      - ~/repo/packages/subgraph/node_modules
     test:
         working_directory: ~/repo
         docker:
             - image: circleci/node:10.18.1
         steps:
             - restore_cache:
-                keys:
-                    - repo-{{ .Environment.CIRCLE_SHA1 }}
+                  keys:
+                      - repo-{{ .Environment.CIRCLE_SHA1 }}
             - run:
-                name: "Test Packages"
-                command: yarn test
+                  name: 'Test Packages'
+                  command: yarn test
 
 workflows:
     version: 2
     main:
         jobs:
             - build:
-                filters:
-                    branches:
-                        ignore: gh-pages
+                  filters:
+                      branches:
+                          ignore: gh-pages
             - test:
-                requires:
-                    - build
-                filters:
-                    branches:
-                        ignore: gh-pages
+                  requires:
+                      - build
+                  filters:
+                      branches:
+                          ignore: gh-pages