fix #7 - allow passing a custom event.json to be populated in the container filesystem

actions/runner.go

@@ -46,12 +46,12 @@ func (wFile *workflowsFile) GraphEvent(eventName string) ([][]string, error) {
 	return wFile.newExecutionGraph(workflow.Resolves...), nil
 }
 
-func (wFile *workflowsFile) RunAction(ctx context.Context, dryrun bool, actionName string) error {
+func (wFile *workflowsFile) RunAction(ctx context.Context, dryrun bool, actionName string, eventJSON string) error {
 	log.Debugf("Running action '%s'", actionName)
-	return wFile.newActionExecutor(ctx, dryrun, "", actionName)()
+	return wFile.newActionExecutor(ctx, dryrun, "", eventJSON, actionName)()
 }
 
-func (wFile *workflowsFile) RunEvent(ctx context.Context, dryrun bool, eventName string) error {
+func (wFile *workflowsFile) RunEvent(ctx context.Context, dryrun bool, eventName string, eventJSON string) error {
 	log.Debugf("Running event '%s'", eventName)
 	workflow, _, err := wFile.getWorkflow(eventName)
 	if err != nil {
@@ -59,7 +59,7 @@ func (wFile *workflowsFile) RunEvent(ctx context.Context, dryrun bool, eventName
 	}
 
 	log.Debugf("Running actions %s -> %s", eventName, workflow.Resolves)
-	return wFile.newActionExecutor(ctx, dryrun, eventName, workflow.Resolves...)()
+	return wFile.newActionExecutor(ctx, dryrun, eventName, eventJSON, workflow.Resolves...)()
 }
 
 func (wFile *workflowsFile) getWorkflow(eventName string) (*workflowDef, string, error) {
@@ -138,7 +138,7 @@ func listInLists(srcList []string, searchLists ...[]string) bool {
 	return true
 }
 
-func (wFile *workflowsFile) newActionExecutor(ctx context.Context, dryrun bool, eventName string, actionNames ...string) common.Executor {
+func (wFile *workflowsFile) newActionExecutor(ctx context.Context, dryrun bool, eventName string, eventJSON string, actionNames ...string) common.Executor {
 	graph := wFile.newExecutionGraph(actionNames...)
 
 	pipeline := make([]common.Executor, 0)
@@ -149,7 +149,7 @@ func (wFile *workflowsFile) newActionExecutor(ctx context.Context, dryrun bool,
 			if err != nil {
 				return common.NewErrorExecutor(err)
 			}
-			actionExecutor := action.asExecutor(ctx, dryrun, wFile.WorkingDir, wFile.TempDir, actionName, wFile.setupEnvironment(eventName, actionName, dryrun))
+			actionExecutor := action.asExecutor(ctx, dryrun, wFile.WorkingDir, wFile.TempDir, actionName, wFile.setupEnvironment(eventName, actionName, dryrun), eventJSON)
 			stage = append(stage, actionExecutor)
 		}
 		pipeline = append(pipeline, common.NewParallelExecutor(stage...))
@@ -158,7 +158,7 @@ func (wFile *workflowsFile) newActionExecutor(ctx context.Context, dryrun bool,
 	return common.NewPipelineExecutor(pipeline...)
 }
 
-func (action *actionDef) asExecutor(ctx context.Context, dryrun bool, workingDir string, tempDir string, actionName string, env []string) common.Executor {
+func (action *actionDef) asExecutor(ctx context.Context, dryrun bool, workingDir string, tempDir string, actionName string, env []string, eventJSON string) common.Executor {
 	logger := newActionLogger(actionName, dryrun)
 	log.Debugf("Using '%s' for action '%s'", action.Uses, actionName)
 
@@ -206,7 +206,7 @@ func (action *actionDef) asExecutor(ctx context.Context, dryrun bool, workingDir
 		return common.NewErrorExecutor(fmt.Errorf("unable to determine executor type for image '%s'", action.Uses))
 	}
 
-	ghReader, err := action.createGithubTarball()
+	ghReader, err := action.createGithubTarball(eventJSON)
 	if err != nil {
 		return common.NewErrorExecutor(err)
 	}
@@ -244,7 +244,7 @@ func randString(slen int) string {
 	return string(b)
 }
 
-func (action *actionDef) createGithubTarball() (io.Reader, error) {
+func (action *actionDef) createGithubTarball(eventJSON string) (io.Reader, error) {
 	var buf bytes.Buffer
 	tw := tar.NewWriter(&buf)
 	var files = []struct {
@@ -252,18 +252,19 @@ func (action *actionDef) createGithubTarball() (io.Reader, error) {
 		Mode int64
 		Body string
 	}{
-		{"workflow/event.json", 0644, "{}"},
+		{"workflow/event.json", 0644, eventJSON},
 	}
 	for _, file := range files {
+		log.Debugf("Writing entry to tarball %s len:%d from %v", file.Name, len(eventJSON), eventJSON)
 		hdr := &tar.Header{
 			Name: file.Name,
 			Mode: file.Mode,
-			Size: int64(len(file.Body)),
+			Size: int64(len(eventJSON)),
 		}
 		if err := tw.WriteHeader(hdr); err != nil {
 			return nil, err
 		}
-		if _, err := tw.Write([]byte(file.Body)); err != nil {
+		if _, err := tw.Write([]byte(eventJSON)); err != nil {
 			return nil, err
 		}
 	}

actions/types.go

@@ -25,12 +25,12 @@ type EventLister interface {
 
 // ActionRunner to run an action
 type ActionRunner interface {
-	RunAction(ctx context.Context, dryrun bool, action string) error
+	RunAction(ctx context.Context, dryrun bool, action string, eventJSON string) error
 }
 
 // EventRunner to run an event
 type EventRunner interface {
-	RunEvent(ctx context.Context, dryrun bool, event string) error
+	RunEvent(ctx context.Context, dryrun bool, event string, eventJSON string) error
 }
 
 type workflowDef struct {

cmd/root.go

@@ -3,7 +3,9 @@ package cmd
 import (
 	"context"
 	"fmt"
+	"io/ioutil"
 	"os"
+	"path/filepath"
 
 	"github.com/nektos/act/actions"
 	"github.com/nektos/act/common"
@@ -17,6 +19,7 @@ var workingDir string
 var list bool
 var actionName string
 var dryrun bool
+var eventPath string
 
 // Execute is the entry point to running the CLI
 func Execute(ctx context.Context, version string) {
@@ -30,6 +33,7 @@ func Execute(ctx context.Context, version string) {
 	}
 	rootCmd.Flags().BoolVarP(&list, "list", "l", false, "list actions")
 	rootCmd.Flags().StringVarP(&actionName, "action", "a", "", "run action")
+	rootCmd.Flags().StringVarP(&eventPath, "event", "e", "", "path to event JSON file")
 	rootCmd.PersistentFlags().BoolVarP(&dryrun, "dryrun", "n", false, "dryrun mode")
 	rootCmd.PersistentFlags().BoolVarP(&verbose, "verbose", "v", false, "verbose output")
 	rootCmd.PersistentFlags().StringVarP(&workflowPath, "file", "f", "./.github/main.workflow", "path to workflow file")
@@ -57,14 +61,27 @@ func newRunAction(ctx context.Context) func(*cobra.Command, []string) error {
 			return listEvents(workflows)
 		}
 
+		eventJSON := "{}"
+		if eventPath != "" {
+			if !filepath.IsAbs(eventPath) {
+				eventPath = filepath.Join(workingDir, eventPath)
+			}
+			log.Debugf("Reading event.json from %s", eventPath)
+			eventJSONBytes, err := ioutil.ReadFile(eventPath)
+			if err != nil {
+				return err
+			}
+			eventJSON = string(eventJSONBytes)
+		}
+
 		if actionName != "" {
-			return workflows.RunAction(ctx, dryrun, actionName)
+			return workflows.RunAction(ctx, dryrun, actionName, eventJSON)
 		}
 
 		if len(args) == 0 {
-			return workflows.RunEvent(ctx, dryrun, "push")
+			return workflows.RunEvent(ctx, dryrun, "push", eventJSON)
 		}
-		return workflows.RunEvent(ctx, dryrun, args[0])
+		return workflows.RunEvent(ctx, dryrun, args[0], eventJSON)
 	}
 }
 

example/.github/main.workflow

@@ -16,6 +16,6 @@ action "test" {
 
 action "deploy" {
   uses = "./action2"
-  args = "echo 'deploy'"
+  runs = ["/bin/sh", "-c", "cat $GITHUB_EVENT_PATH"]
   needs = ["test"]
 }

example/event.json

@@ -0,0 +1,3 @@
+{
+  "foo": "bar"
+}