Switch to GitHub Actions from Travis. (#85)

Use GitHub Actions because we're deprecating use of Travis for our OSS
projects.

This change ran into some issues with the `generatenodirty` check so
we changed it to print `git status`. We ran into an issue where
`go mod download` was changing the go.sum and `go mod tidy` was alone.

As a workaround for this, the CI job doesn't `go mod download` by
default; we'll let the actual `test` or `build` commands do that.

.github/workflows/go.yml

@@ -0,0 +1,46 @@
+name: Go
+
+on:
+  push:
+    branches: ['*']
+    tags: ['v*']
+  pull_request:
+    branches: ['*']
+
+jobs:
+
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        go: ["1.15.x", "1.16.x"]
+        include:
+        - go: 1.16.x
+          latest: true
+
+    steps:
+    - name: Setup Go
+      uses: actions/setup-go@v2
+      with:
+        go-version: ${{ matrix.go }}
+
+    - name: Checkout code
+      uses: actions/checkout@v2
+
+    - name: Load cached dependencies
+      uses: actions/cache@v1
+      with:
+        path: ~/go/pkg/mod
+        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+        restore-keys: |
+          ${{ runner.os }}-go-
+
+    - name: Lint
+      if: matrix.latest
+      run: make lint
+
+    - name: Test
+      run: make cover
+
+    - name: Upload coverage to codecov.io
+      uses: codecov/codecov-action@v1

.travis.yml

@@ -1,27 +0,0 @@
-sudo: false
-language: go
-go_import_path: go.uber.org/atomic
-
-env:
-  global:
-    - GO111MODULE=on
-
-matrix:
-  include:
-  - go: oldstable
-  - go: stable
-    env: LINT=1
-
-cache:
-  directories:
-    - vendor
-
-before_install:
-  - go version
-
-script:
-  - test -z "$LINT" || make lint
-  - make cover
-
-after_success:
-  - bash <(curl -s https://codecov.io/bash)

Makefile

@@ -69,6 +69,7 @@ generate: $(GEN_ATOMICINT) $(GEN_ATOMICWRAPPER)
 generatenodirty:
 	@[ -z "$$(git status --porcelain)" ] || ( \
 		echo "Working tree is dirty. Commit your changes first."; \
+		git status; \
 		exit 1 )
 	@make generate
 	@status=$$(git status --porcelain); \

README.md

@@ -55,8 +55,8 @@ Released under the [MIT License](LICENSE.txt).
 
 [doc-img]: https://godoc.org/github.com/uber-go/atomic?status.svg
 [doc]: https://godoc.org/go.uber.org/atomic
-[ci-img]: https://travis-ci.com/uber-go/atomic.svg?branch=master
-[ci]: https://travis-ci.com/uber-go/atomic
+[ci-img]: https://github.com/uber-go/atomic/actions/workflows/go.yml/badge.svg
+[ci]: https://github.com/uber-go/atomic/actions/workflows/go.yml
 [cov-img]: https://codecov.io/gh/uber-go/atomic/branch/master/graph/badge.svg
 [cov]: https://codecov.io/gh/uber-go/atomic
 [reportcard-img]: https://goreportcard.com/badge/go.uber.org/atomic

go.sum

@@ -1,4 +1,3 @@
-github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=