ci: migrate from Travis CI to GitHub Actions (#62)

* ci: migrate from Travis CI to GitHub Actions

- Travis CI is only _pseudo_-free after the .org -> .com merge
  - c.f. https://travis-ci.community/t/org-com-migration-unexpectedly-comes-with-a-plan-change-for-oss-what-exactly-is-the-new-deal/10567

- GH Actions are _actually_ free for OSS / public repos
  - and also offer a decent level of composability that's resulted in a huge surge in reusable community Actions (vs. CircleCI orbs etc haven't had nearly as much adoption)
  - and I've had a mostly great experience on them so far as well

- add a matrix for OSes and different Go versions too
  - currently only using one Go version (as it was on Travis), but can add more later
  - currently only testing latest Ubuntu and macOS (as it was on Travis), but can add more versions and OSes later
    - note that tests fail on Windows right now (due to the shell?)

- check for `$RUNNER_OS` instead of `$TRAVIS_OS_NAME` now
  - c.f. https://docs.github.com/en/actions/learn-github-actions/environment-variables
  - update the commented out "Debug" step to conditionally run on macOS as well

* fix: make get_docopts work on macOS

- tests failing on macOS b/c `sha256sum` doesn't exist
  - only use the third arg in the workaround as it doesn't support flags

* run on PRs as well

Author: agilgur5

.github/workflows/ci.yml

@@ -0,0 +1,41 @@
+name: CI
+on:
+  pull_request:
+    branches: [master]
+  push:
+    branches: [docopts-go, master]
+
+jobs:
+  ci:
+    name: CI - Go ${{ matrix.go-version }}, ${{ matrix.os }}
+
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        go-version: ["1.14"]
+        os: [ubuntu-latest, macOS-latest]
+
+    steps:
+    - name: Checkout repo
+      uses: actions/checkout@v3
+    - name: Setup Go ${{ matrix.go-version }}
+      uses: actions/setup-go@v3
+      with:
+        go-version: ${{ matrix.go-version }}
+        # cache: true # TODO: cache needs path to go.sum per https://github.com/actions/setup-go#caching-dependency-files-and-build-outputs
+    - name: Install
+      run: |
+        bash --version ; type bash
+        # hack for speedup on mac build with our own bash5
+        ./travis/get_bash5_macos.sh
+        ./travis/get_bats-core.sh
+        go get github.com/docopt/docopt-go
+        # get our official repos too
+        go get github.com/docopt/docopts
+    - name: Test
+      run: make test
+
+      # For debugging, create reverse SSH tunnel (this should be run on failure too)
+      # - name: Debug
+      #   if: runner.os == "macOS"
+      #   run: bash -x ./travis/reverse_ssh_tunnel.sh

.travis.yml

@@ -100,6 +100,11 @@ URL="$BASE_URL/$RELEASE/$BINARY_DOWNLOAD"
 
 echo "Fetching from: $URL"
 
+if [[ "$OS_URL" == "darwin" ]]; then
+  # sha256sum doesn't exist on macOS, workaround: https://unix.stackexchange.com/a/426838/152866
+  function sha256sum() { openssl sha256 "$2" | awk '{print $2}'; }
+fi
+
 # verification
 if wget -O $BINARY_DOWNLOAD "$URL" ; then
   file $BINARY_DOWNLOAD

get_docopts.sh

@@ -4,20 +4,18 @@
 #
 # Our hack for macos bash version too old for unit testing
 
-# was in .travis.yml
 # brew update takes very long time
-# according to https://docs.travis-ci.com/user/reference/osx#homebrew
 # homebrew is already updated, but it's still really slow
-#- if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew update ; fi
-#- if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew install bash; fi
+#- if [[ "$RUNNER_OS" == "macOS" ]]; then brew update ; fi
+#- if [[ "$RUNNER_OS" == "macOS" ]]; then brew install bash; fi
 
 pathshow ()
 {
     local var=${1:-PATH};
     eval "echo \$$var | tr : $'\n'"
 }
 
-if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then
+if [[ "$RUNNER_OS" == "macOS" ]]; then
   if ((BASH_VERSINFO[0] <= 3)) ; then
 
     # The following hack kept a bash5 binary in our repository