Make envs available in if conditionals (#225)

* Ignore .idea

* Add Env to the RunContext vm so we can Evaluate and Interpolate `env.xx`

* Make EvalBool support expressions more in line with the github runner

* Turns out Boolean(value) is what github is doing after all

* Add test for github context as well

.gitignore

@@ -16,3 +16,4 @@ dist/
 
 *.nupkg
 .vscode/
+.idea/

pkg/runner/expression.go

@@ -119,6 +119,7 @@ func (rc *RunContext) newVM() *otto.Otto {
 		rc.vmSecrets(),
 		rc.vmStrategy(),
 		rc.vmMatrix(),
+		rc.vmEnv(),
 	}
 	vm := otto.New()
 	for _, configer := range configers {
@@ -196,18 +197,18 @@ func (rc *RunContext) vmHashFiles() func(*otto.Otto) {
 		_ = vm.Set("hashFiles", func(path string) string {
 			files, _, err := glob.Glob([]string{filepath.Join(rc.Config.Workdir, path)})
 			if err != nil {
-				logrus.Error(err)
+				logrus.Errorf("Unable to glob.Glob: %v", err)
 				return ""
 			}
 			hasher := sha256.New()
 			for _, file := range files {
 				f, err := os.Open(file.Path)
 				if err != nil {
-					logrus.Error(err)
+					logrus.Errorf("Unable to os.Open: %v", err)
 				}
 				defer f.Close()
 				if _, err := io.Copy(hasher, f); err != nil {
-					logrus.Error(err)
+					logrus.Errorf("Unable to io.Copy: %v", err)
 				}
 			}
 			return hex.EncodeToString(hasher.Sum(nil))
@@ -251,6 +252,14 @@ func (rc *RunContext) vmGithub() func(*otto.Otto) {
 	}
 }
 
+func (rc *RunContext) vmEnv() func(*otto.Otto) {
+	return func(vm *otto.Otto) {
+		env := rc.GetEnv()
+		log.Debugf("context env => %v", env)
+		_ = vm.Set("env", env)
+	}
+}
+
 func (sc *StepContext) vmEnv() func(*otto.Otto) {
 	return func(vm *otto.Otto) {
 		log.Debugf("context env => %v", sc.Env)

pkg/runner/expression_test.go

@@ -4,15 +4,18 @@ import (
 	"testing"
 
 	"github.com/nektos/act/pkg/model"
-	"github.com/stretchr/testify/assert"
+	a "github.com/stretchr/testify/assert"
 )
 
 func TestEvaluate(t *testing.T) {
-	assert := assert.New(t)
+	assert := a.New(t)
 	rc := &RunContext{
 		Config: &Config{
 			Workdir: ".",
 		},
+		Env: map[string]string{
+			"key": "value",
+		},
 		Run: &model.Run{
 			JobID: "job1",
 			Workflow: &model.Workflow{
@@ -79,6 +82,8 @@ func TestEvaluate(t *testing.T) {
 		{"runner.os", "Linux", ""},
 		{"matrix.os", "Linux", ""},
 		{"matrix.foo", "bar", ""},
+		{"env.key", "value", ""},
+
 	}
 
 	for _, table := range tables {
@@ -97,11 +102,14 @@ func TestEvaluate(t *testing.T) {
 }
 
 func TestInterpolate(t *testing.T) {
-	assert := assert.New(t)
+	assert := a.New(t)
 	rc := &RunContext{
 		Config: &Config{
 			Workdir: ".",
 		},
+		Env: map[string]string{
+			"key": "value",
+		},
 		Run: &model.Run{
 			JobID: "job1",
 			Workflow: &model.Workflow{
@@ -113,8 +121,20 @@ func TestInterpolate(t *testing.T) {
 		},
 	}
 	ee := rc.NewExpressionEvaluator()
-
-	out := ee.Interpolate(" ${{1}} to ${{2}} ")
-
-	assert.Equal(" 1 to 2 ", out)
+	tables := []struct{
+		in string
+		out string
+	}{
+		{" ${{1}} to ${{2}} ", " 1 to 2 "},
+		{" ${{ env.key }} ", " value "},
+		{"${{ env.unknown }}", ""},
+	}
+
+	for _, table := range tables {
+		table := table
+		t.Run(table.in, func(t *testing.T) {
+			out := ee.Interpolate(table.in)
+			assert.Equal(table.out, out, table.in)
+		})
+	}
 }

pkg/runner/run_context.go

@@ -235,15 +235,15 @@ func (rc *RunContext) platformImage() string {
 
 func (rc *RunContext) isEnabled(ctx context.Context) bool {
 	job := rc.Run.Job()
-	log := common.Logger(ctx)
+	l := common.Logger(ctx)
 	if !rc.EvalBool(job.If) {
-		log.Debugf("Skipping job '%s' due to '%s'", job.Name, job.If)
+		l.Debugf("Skipping job '%s' due to '%s'", job.Name, job.If)
 		return false
 	}
 
 	img := rc.platformImage()
 	if img == "" {
-		log.Infof("\U0001F6A7  Skipping unsupported platform '%+v'", job.RunsOn())
+		l.Infof("\U0001F6A7  Skipping unsupported platform '%+v'", job.RunsOn())
 		return false
 	}
 	return true
@@ -252,11 +252,9 @@ func (rc *RunContext) isEnabled(ctx context.Context) bool {
 // EvalBool evaluates an expression against current run context
 func (rc *RunContext) EvalBool(expr string) bool {
 	if expr != "" {
-		//v, err := rc.ExprEval.Evaluate(fmt.Sprintf("if (%s) { true } else { false }", expr))
-		expr := fmt.Sprintf("Boolean(%s)", expr)
+		expr = fmt.Sprintf("Boolean(%s)", rc.ExprEval.Interpolate(expr))
 		v, err := rc.ExprEval.Evaluate(expr)
 		if err != nil {
-			log.Errorf("Error evaluating expression '%s' - %v", expr, err)
 			return false
 		}
 		log.Debugf("expression '%s' evaluated to '%s'", expr, v)
@@ -386,9 +384,11 @@ func (rc *RunContext) getGithubContext() *githubContext {
 		log.Debugf("using github ref: %s", ref)
 		ghc.Ref = ref
 	}
+	if rc.EventJSON != "" {
 		err = json.Unmarshal([]byte(rc.EventJSON), &ghc.Event)
 		if err != nil {
-		logrus.Error(err)
+			logrus.Errorf("Unable to Unmarshal event '%s': %v", rc.EventJSON, err)
+		}
 	}
 
 	if ghc.EventName == "pull_request" {

pkg/runner/run_context_test.go

@@ -0,0 +1,107 @@
+package runner
+
+import (
+	"github.com/nektos/act/pkg/model"
+	a "github.com/stretchr/testify/assert"
+	"testing"
+
+	"github.com/sirupsen/logrus/hooks/test"
+)
+
+func TestRunContext_EvalBool(t *testing.T) {
+	hook := test.NewGlobal()
+	assert := a.New(t)
+	rc := &RunContext{
+		Config: &Config{
+			Workdir: ".",
+		},
+		Env: map[string]string{
+			"TRUE":  "true",
+			"FALSE": "false",
+			"SOME_TEXT": "text",
+		},
+		Run: &model.Run{
+			JobID: "job1",
+			Workflow: &model.Workflow{
+				Name: "test-workflow",
+				Jobs: map[string]*model.Job{
+					"job1": {
+						Strategy: &model.Strategy{
+							Matrix: map[string][]interface{}{
+								"os":  {"Linux", "Windows"},
+								"foo": {"bar", "baz"},
+							},
+						},
+					},
+				},
+			},
+		},
+		Matrix: map[string]interface{}{
+			"os":  "Linux",
+			"foo": "bar",
+		},
+		StepResults: map[string]*stepResult{
+			"id1": {
+				Outputs: map[string]string{
+					"foo": "bar",
+				},
+				Success: true,
+			},
+		},
+	}
+	rc.ExprEval = rc.NewExpressionEvaluator()
+
+	tables := []struct {
+		in      string
+		out     bool
+	}{
+		// The basic ones
+		{"true", true},
+		{"false", false},
+		{"1 !== 0", true},
+		{"1 !== 1", false},
+		{"1 == 0", false},
+		{"1 == 1", true},
+		{"1 > 2", false},
+		{"1 < 2", true},
+		{"success()", true},
+		{"failure()", false},
+		// And or
+		{"true && false", false},
+		{"true && 1 < 2", true},
+		{"false || 1 < 2", true},
+		{"false || false", false},
+		// None boolable
+		{"env.SOME_TEXT", true},
+		{"env.UNKNOWN == 'true'", false},
+		{"env.UNKNOWN", false},
+		// Inline expressions
+		{"env.TRUE == 'true'", true},
+		{"env.FALSE == 'true'", false},
+		{"${{env.TRUE == 'true'}}", true},
+		{"${{env.FALSE == 'true'}}", false},
+		{"${{env.FALSE == 'false'}}", true},
+		// All together now
+		{"false || env.TRUE == 'true'", true},
+		{"true || env.FALSE == 'true'", true},
+		{"true && env.TRUE == 'true'", true},
+		{"false && env.TRUE == 'true'", false},
+		{"env.FALSE == 'true' && env.TRUE == 'true'", false},
+		{"env.FALSE == 'true' && true", false},
+		{"${{env.FALSE == 'true'}} && true", false},
+		// Check github context
+		{"github.actor == 'nektos/act'", true},
+		{"github.actor == 'unknown'", false},
+	}
+
+	for _, table := range tables {
+		table := table
+		t.Run(table.in, func(t *testing.T) {
+			defer hook.Reset()
+			b := rc.EvalBool(table.in)
+
+			assert.Equal(table.out, b, table.in)
+			assert.Empty(hook.LastEntry(), table.in)
+		})
+	}
+}