Support running commands in repositories without action.yaml (#293)

* Comment for public function

* Add git describe fallback

* spelling: github

* Set initial branch to satisfy tests for modern git

* Clarify -even- if

* Go 1.16

* Support running commands in repositories without action.yaml

Support runnings commands with only a Docker file

Co-authored-by: Casey Lee <cplee@nektos.com>

.github/workflows/push.yml

@@ -7,6 +7,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+      - uses: actions/setup-go@v1
+        with:
+          go-version: 1.16
       - uses: golangci/golangci-lint-action@v2
         env:
           CGO_ENABLED: 0
@@ -24,7 +27,7 @@ jobs:
         uses: docker/setup-qemu-action@v1
       - uses: actions/setup-go@v1
         with:
-          go-version: 1.14
+          go-version: 1.16
       - run: go test -cover -coverprofile=coverage.txt -covermode=atomic ./...
         env:
           CGO_ENABLED: 0
@@ -42,7 +45,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-go@v1
         with:
-          go-version: 1.14
+          go-version: 1.16
       - name: Install MacOS Docker
         uses: docker-practice/actions-setup-docker@master
       - run: go test -v -timeout 1h -cover ./...
@@ -58,6 +61,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+      - uses: actions/setup-go@v1
+        with:
+          go-version: 1.16
       - name: GoReleaser
         uses: goreleaser/goreleaser-action@v2
         with:
@@ -90,6 +96,9 @@ jobs:
       - uses: actions/checkout@v2
         with:
           fetch-depth: 0
+      - uses: actions/setup-go@v1
+        with:
+          go-version: 1.16
       - name: GoReleaser
         uses: goreleaser/goreleaser-action@v1
         with:

.github/workflows/test-expressions.yml

@@ -1,5 +1,5 @@
 
-name: "Test how expressions are handled on Github"
+name: "Test how expressions are handled on GitHub"
 on: push
 
 env:

.github/workflows/test-if.yml

@@ -1,5 +1,5 @@
 
-name: "Test what expressions result in true and false on Github"
+name: "Test what expressions result in true and false on GitHub"
 on: push
 
 env:

Makefile

@@ -1,5 +1,5 @@
 PREFIX ?= /usr/local
-VERSION ?= $(shell git describe --tags --dirty | cut -c 2-)
+VERSION ?= $(shell git describe --tags --dirty --always | cut -c 2-)
 IS_SNAPSHOT = $(if $(findstring -, $(VERSION)),true,false)
 MAJOR_VERSION = $(word 1, $(subst ., ,$(VERSION)))
 MINOR_VERSION = $(word 2, $(subst ., ,$(VERSION)))

README.md

@@ -102,7 +102,7 @@ It will save that information to `~/.actrc`, please refer to [Configuration](#co
   -l, --list                            list workflows
   -P, --platform stringArray            custom image to use per platform (e.g. -P ubuntu-18.04=nektos/act-environments-ubuntu:18.04)
       --privileged                      use privileged mode
-  -p, --pull                            pull docker image(s) if already present
+  -p, --pull                            pull docker image(s) even if already present
   -q, --quiet                           disable logging of output from steps
   -r, --reuse                           reuse action containers to maintain state
   -s, --secret stringArray              secret to make available to actions with optional value (e.g. -s mysecret=foo or -s mysecret)

cmd/root.go

@@ -27,7 +27,7 @@ func Execute(ctx context.Context, version string) {
 	input := new(Input)
 	var rootCmd = &cobra.Command{
 		Use:              "act [event name to run]\nIf no event name passed, will default to \"on: push\"",
-		Short:            "Run Github actions locally by specifying the event name (e.g. `push`) or an action name directly.",
+		Short:            "Run GitHub actions locally by specifying the event name (e.g. `push`) or an action name directly.",
 		Args:             cobra.MaximumNArgs(1),
 		RunE:             newRunCommand(ctx, input),
 		PersistentPreRun: setupLogging,
@@ -43,7 +43,7 @@ func Execute(ctx context.Context, version string) {
 	rootCmd.Flags().StringArrayVarP(&input.platforms, "platform", "P", []string{}, "custom image to use per platform (e.g. -P ubuntu-18.04=nektos/act-environments-ubuntu:18.04)")
 	rootCmd.Flags().BoolVarP(&input.reuseContainers, "reuse", "r", false, "reuse action containers to maintain state")
 	rootCmd.Flags().BoolVarP(&input.bindWorkdir, "bind", "b", false, "bind working directory to container, rather than copy")
-	rootCmd.Flags().BoolVarP(&input.forcePull, "pull", "p", false, "pull docker image(s) if already present")
+	rootCmd.Flags().BoolVarP(&input.forcePull, "pull", "p", false, "pull docker image(s) even if already present")
 	rootCmd.Flags().BoolVarP(&input.autodetectEvent, "detect-event", "", false, "Use first event type from workflow as event that triggered the workflow")
 	rootCmd.Flags().StringVarP(&input.eventPath, "eventpath", "e", "", "path to event JSON file")
 	rootCmd.Flags().StringVar(&input.defaultBranch, "defaultbranch", "", "the name of the main branch")

go.mod

@@ -1,6 +1,6 @@
 module github.com/nektos/act
 
-go 1.14
+go 1.16
 
 require (
 	github.com/AlecAivazis/survey/v2 v2.2.7

pkg/common/git.go

@@ -189,6 +189,7 @@ type NewGitCloneExecutorInput struct {
 	Dir string
 }
 
+// CloneIfRequired ...
 func CloneIfRequired(refName plumbing.ReferenceName, input NewGitCloneExecutorInput, logger log.FieldLogger) (*git.Repository, error) {
 	r, err := git.PlainOpen(input.Dir)
 	if err != nil {

pkg/common/git_test.go

@@ -161,7 +161,7 @@ func TestGitFindRef(t *testing.T) {
 		t.Run(name, func(t *testing.T) {
 			dir := filepath.Join(basedir, name)
 			require.NoError(t, os.MkdirAll(dir, 0755))
-			require.NoError(t, gitCmd("-C", dir, "init"))
+			require.NoError(t, gitCmd("-C", dir, "init", "--initial-branch=master"))
 			require.NoError(t, cleanGitHooks(dir))
 			tt.Prepare(t, dir)
 			ref, err := FindGitRef(dir)

pkg/model/action.go

@@ -38,6 +38,16 @@ const (
 	ActionRunsUsingDocker = "docker"
 )
 
+// ActionRuns are a field in Action
+type ActionRuns struct {
+	Using      ActionRunsUsing   `yaml:"using"`
+	Env        map[string]string `yaml:"env"`
+	Main       string            `yaml:"main"`
+	Image      string            `yaml:"image"`
+	Entrypoint []string          `yaml:"entrypoint"`
+	Args       []string          `yaml:"args"`
+}
+
 // Action describes a metadata file for GitHub actions. The metadata filename must be either action.yml or action.yaml. The data in the metadata file defines the inputs, outputs and main entrypoint for your action.
 type Action struct {
 	Name        string            `yaml:"name"`
@@ -45,15 +55,8 @@ type Action struct {
 	Description string            `yaml:"description"`
 	Inputs      map[string]Input  `yaml:"inputs"`
 	Outputs     map[string]Output `yaml:"outputs"`
-	Runs        struct {
-		Using      ActionRunsUsing   `yaml:"using"`
-		Env        map[string]string `yaml:"env"`
-		Main       string            `yaml:"main"`
-		Image      string            `yaml:"image"`
-		Entrypoint []string          `yaml:"entrypoint"`
-		Args       []string          `yaml:"args"`
-	} `yaml:"runs"`
-	Branding struct {
+	Runs        ActionRuns        `yaml:"runs"`
+	Branding    struct {
 		Color string `yaml:"color"`
 		Icon  string `yaml:"icon"`
 	} `yaml:"branding"`

pkg/runner/expression_test.go

@@ -211,7 +211,7 @@ func updateTestExpressionWorkflow(t *testing.T, tables []struct {
 	}
 
 	workflow := fmt.Sprintf(`
-name: "Test how expressions are handled on Github"
+name: "Test how expressions are handled on GitHub"
 on: push
 
 env:

pkg/runner/res/trampoline.js

@@ -0,0 +1,14 @@
+const { spawnSync } = require('child_process')
+const spawnArguments={
+  cwd: process.env['INPUT_CWD'],
+  stdio: [
+    process.stdin,
+    process.stdout,
+    process.stderr,
+  ]
+}
+const child=spawnSync(
+  '/bin/sh',
+  [ '-c' ].concat(process.env['INPUT_COMMAND']),
+  spawnArguments)
+process.exit(child.status)

pkg/runner/run_context.go

@@ -316,7 +316,7 @@ func (rc *RunContext) EvalBool(expr string) (bool, error) {
 
 			interpolatedPart, isString := rc.ExprEval.InterpolateWithStringCheck(part)
 
-			// This peculiar transformation has to be done because the Github parser
+			// This peculiar transformation has to be done because the GitHub parser
 			// treats false returned from contexts as a string, not a boolean.
 			// Hence env.SOMETHING will be evaluated to true in an if: expression
 			// regardless if SOMETHING is set to false, true or any other string.

pkg/runner/run_context_test.go

@@ -169,7 +169,7 @@ func updateTestIfWorkflow(t *testing.T, tables []struct {
 	}
 
 	workflow := fmt.Sprintf(`
-name: "Test what expressions result in true and false on Github"
+name: "Test what expressions result in true and false on GitHub"
 on: push
 
 env:

pkg/runner/runner.go

@@ -24,7 +24,7 @@ type Config struct {
 	EventPath             string            // path to JSON file to use for event.json in containers
 	DefaultBranch         string            // name of the main branch for this repository
 	ReuseContainers       bool              // reuse containers to maintain state
-	ForcePull             bool              // force pulling of the image, if already present
+	ForcePull             bool              // force pulling of the image, even if already present
 	LogOutput             bool              // log the output from docker run
 	Env                   map[string]string // env for containers
 	Secrets               map[string]string // list of secrets

pkg/runner/step_context.go

@@ -2,7 +2,10 @@ package runner
 
 import (
 	"context"
+	// Go told me to?
+	_ "embed"
 	"fmt"
+	"io/ioutil"
 	"os"
 	"path"
 	"path/filepath"
@@ -296,12 +299,55 @@ func (sc *StepContext) runUsesContainer() common.Executor {
 	}
 }
 
+//go:embed res/trampoline.js
+var trampoline []byte
+
 func (sc *StepContext) setupAction(actionDir string, actionPath string) common.Executor {
 	return func(ctx context.Context) error {
 		f, err := os.Open(filepath.Join(actionDir, actionPath, "action.yml"))
 		if os.IsNotExist(err) {
 			f, err = os.Open(filepath.Join(actionDir, actionPath, "action.yaml"))
 			if err != nil {
+				if _, err2 := os.Stat(filepath.Join(actionDir, actionPath, "Dockerfile")); err2 == nil {
+					sc.Action = &model.Action{
+						Name: "(Synthetic)",
+						Runs: model.ActionRuns{
+							Using: "docker",
+							Image: "Dockerfile",
+						},
+					}
+					log.Debugf("Using synthetic action %v for Dockerfile", sc.Action)
+					return nil
+				}
+				if sc.Step.With != nil {
+					if val, ok := sc.Step.With["args"]; ok {
+						err2 := ioutil.WriteFile(filepath.Join(actionDir, actionPath, "trampoline.js"), trampoline, 0400)
+						if err2 != nil {
+							return err
+						}
+						sc.Action = &model.Action{
+							Name: "(Synthetic)",
+							Inputs: map[string]model.Input{
+								"cwd": {
+									Description: "(Actual working directory)",
+									Required:    false,
+									Default:     filepath.Join(actionDir, actionPath),
+								},
+								"command": {
+									Description: "(Actual program)",
+									Required:    false,
+									Default:     val,
+								},
+							},
+							Runs: model.ActionRuns{
+								Using: "node12",
+								Main:  "trampoline.js",
+							},
+						}
+						log.Debugf("Using synthetic action %v", sc.Action)
+						return nil
+					}
+				}
 				return err
 			}
 		} else if err != nil {