act/pkg/runner/action.go

651 lines
20 KiB
Go

package runner
import (
"context"
"embed"
"errors"
"fmt"
"io"
"io/fs"
"os"
"path"
"path/filepath"
"regexp"
"runtime"
"strings"
"github.com/kballard/go-shellquote"
"github.com/nektos/act/pkg/common"
"github.com/nektos/act/pkg/container"
"github.com/nektos/act/pkg/model"
)
type actionStep interface {
step
getActionModel() *model.Action
getCompositeRunContext(context.Context) *RunContext
getCompositeSteps() *compositeSteps
}
type readAction func(ctx context.Context, step *model.Step, actionDir string, actionPath string, readFile actionYamlReader, writeFile fileWriter) (*model.Action, error)
type actionYamlReader func(filename string) (io.Reader, io.Closer, error)
type fileWriter func(filename string, data []byte, perm fs.FileMode) error
type runAction func(step actionStep, actionDir string, remoteAction *remoteAction) common.Executor
//go:embed res/trampoline.js
var trampoline embed.FS
func readActionImpl(ctx context.Context, step *model.Step, actionDir string, actionPath string, readFile actionYamlReader, writeFile fileWriter) (*model.Action, error) {
logger := common.Logger(ctx)
allErrors := []error{}
addError := func(fileName string, err error) {
if err != nil {
allErrors = append(allErrors, fmt.Errorf("failed to read '%s' from action '%s' with path '%s' of step %w", fileName, step.String(), actionPath, err))
} else {
// One successful read, clear error state
allErrors = nil
}
}
reader, closer, err := readFile("action.yml")
addError("action.yml", err)
if os.IsNotExist(err) {
reader, closer, err = readFile("action.yaml")
addError("action.yaml", err)
if os.IsNotExist(err) {
_, closer, err := readFile("Dockerfile")
addError("Dockerfile", err)
if err == nil {
closer.Close()
action := &model.Action{
Name: "(Synthetic)",
Runs: model.ActionRuns{
Using: "docker",
Image: "Dockerfile",
},
}
logger.Debugf("Using synthetic action %v for Dockerfile", action)
return action, nil
}
if step.With != nil {
if val, ok := step.With["args"]; ok {
var b []byte
if b, err = trampoline.ReadFile("res/trampoline.js"); err != nil {
return nil, err
}
err2 := writeFile(filepath.Join(actionDir, actionPath, "trampoline.js"), b, 0o400)
if err2 != nil {
return nil, err2
}
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",
},
}
logger.Debugf("Using synthetic action %v", action)
return action, nil
}
}
}
}
if allErrors != nil {
return nil, errors.Join(allErrors...)
}
defer closer.Close()
action, err := model.ReadAction(reader)
logger.Debugf("Read action %v from '%s'", action, "Unknown")
return action, err
}
func maybeCopyToActionDir(ctx context.Context, step actionStep, actionDir string, actionPath string, containerActionDir string) error {
logger := common.Logger(ctx)
rc := step.getRunContext()
stepModel := step.getStepModel()
if stepModel.Type() != model.StepTypeUsesActionRemote {
return nil
}
var containerActionDirCopy string
containerActionDirCopy = strings.TrimSuffix(containerActionDir, actionPath)
logger.Debug(containerActionDirCopy)
if !strings.HasSuffix(containerActionDirCopy, `/`) {
containerActionDirCopy += `/`
}
if rc.Config != nil && rc.Config.ActionCache != nil {
raction := step.(*stepActionRemote)
ta, err := rc.Config.ActionCache.GetTarArchive(ctx, raction.cacheDir, raction.resolvedSha, "")
if err != nil {
return err
}
defer ta.Close()
return rc.JobContainer.CopyTarStream(ctx, containerActionDirCopy, ta)
}
if err := removeGitIgnore(ctx, actionDir); err != nil {
return err
}
return rc.JobContainer.CopyDir(containerActionDirCopy, actionDir+"/", rc.Config.UseGitIgnore)(ctx)
}
func runActionImpl(step actionStep, actionDir string, remoteAction *remoteAction) common.Executor {
rc := step.getRunContext()
stepModel := step.getStepModel()
return func(ctx context.Context) error {
logger := common.Logger(ctx)
actionPath := ""
if remoteAction != nil && remoteAction.Path != "" {
actionPath = remoteAction.Path
}
action := step.getActionModel()
logger.Debugf("About to run action %v", action)
err := setupActionEnv(ctx, step, remoteAction)
if err != nil {
return err
}
actionLocation := path.Join(actionDir, actionPath)
actionName, containerActionDir := getContainerActionPaths(stepModel, actionLocation, rc)
logger.Debugf("type=%v actionDir=%s actionPath=%s workdir=%s actionCacheDir=%s actionName=%s containerActionDir=%s", stepModel.Type(), actionDir, actionPath, rc.Config.Workdir, rc.ActionCacheDir(), actionName, containerActionDir)
switch action.Runs.Using {
case model.ActionRunsUsingNode12, model.ActionRunsUsingNode16, model.ActionRunsUsingNode20:
if err := maybeCopyToActionDir(ctx, step, actionDir, actionPath, containerActionDir); err != nil {
return err
}
containerArgs := []string{"node", path.Join(containerActionDir, action.Runs.Main)}
logger.Debugf("executing remote job container: %s", containerArgs)
rc.ApplyExtraPath(ctx, step.getEnv())
return rc.execJobContainer(containerArgs, *step.getEnv(), "", "")(ctx)
case model.ActionRunsUsingDocker:
location := actionLocation
if remoteAction == nil {
location = containerActionDir
}
return execAsDocker(ctx, step, actionName, location, remoteAction == nil)
case model.ActionRunsUsingComposite:
if err := maybeCopyToActionDir(ctx, step, actionDir, actionPath, containerActionDir); err != nil {
return err
}
return execAsComposite(step)(ctx)
default:
return fmt.Errorf(fmt.Sprintf("The runs.using key must be one of: %v, got %s", []string{
model.ActionRunsUsingDocker,
model.ActionRunsUsingNode12,
model.ActionRunsUsingNode16,
model.ActionRunsUsingNode20,
model.ActionRunsUsingComposite,
}, action.Runs.Using))
}
}
}
func setupActionEnv(ctx context.Context, step actionStep, _ *remoteAction) error {
rc := step.getRunContext()
// A few fields in the environment (e.g. GITHUB_ACTION_REPOSITORY)
// are dependent on the action. That means we can complete the
// setup only after resolving the whole action model and cloning
// the action
rc.withGithubEnv(ctx, step.getGithubContext(ctx), *step.getEnv())
populateEnvsFromSavedState(step.getEnv(), step, rc)
populateEnvsFromInput(ctx, step.getEnv(), step.getActionModel(), rc)
return nil
}
// https://github.com/nektos/act/issues/228#issuecomment-629709055
// files in .gitignore are not copied in a Docker container
// this causes issues with actions that ignore other important resources
// such as `node_modules` for example
func removeGitIgnore(ctx context.Context, directory string) error {
gitIgnorePath := path.Join(directory, ".gitignore")
if _, err := os.Stat(gitIgnorePath); err == nil {
// .gitignore exists
common.Logger(ctx).Debugf("Removing %s before docker cp", gitIgnorePath)
err := os.Remove(gitIgnorePath)
if err != nil {
return err
}
}
return nil
}
// TODO: break out parts of function to reduce complexicity
//
//nolint:gocyclo
func execAsDocker(ctx context.Context, step actionStep, actionName string, basedir string, localAction bool) error {
logger := common.Logger(ctx)
rc := step.getRunContext()
action := step.getActionModel()
var prepImage common.Executor
var image string
forcePull := false
if strings.HasPrefix(action.Runs.Image, "docker://") {
image = strings.TrimPrefix(action.Runs.Image, "docker://")
// Apply forcePull only for prebuild docker images
forcePull = rc.Config.ForcePull
} else {
// "-dockeraction" enshures that "./", "./test " won't get converted to "act-:latest", "act-test-:latest" which are invalid docker image names
image = fmt.Sprintf("%s-dockeraction:%s", regexp.MustCompile("[^a-zA-Z0-9]").ReplaceAllString(actionName, "-"), "latest")
image = fmt.Sprintf("act-%s", strings.TrimLeft(image, "-"))
image = strings.ToLower(image)
contextDir, fileName := filepath.Split(filepath.Join(basedir, action.Runs.Image))
anyArchExists, err := container.ImageExistsLocally(ctx, image, "any")
if err != nil {
return err
}
correctArchExists, err := container.ImageExistsLocally(ctx, image, rc.Config.ContainerArchitecture)
if err != nil {
return err
}
if anyArchExists && !correctArchExists {
wasRemoved, err := container.RemoveImage(ctx, image, true, true)
if err != nil {
return err
}
if !wasRemoved {
return fmt.Errorf("failed to remove image '%s'", image)
}
}
if !correctArchExists || rc.Config.ForceRebuild {
logger.Debugf("image '%s' for architecture '%s' will be built from context '%s", image, rc.Config.ContainerArchitecture, contextDir)
var buildContext io.ReadCloser
if localAction {
buildContext, err = rc.JobContainer.GetContainerArchive(ctx, contextDir+"/.")
if err != nil {
return err
}
defer buildContext.Close()
} else if rc.Config.ActionCache != nil {
rstep := step.(*stepActionRemote)
buildContext, err = rc.Config.ActionCache.GetTarArchive(ctx, rstep.cacheDir, rstep.resolvedSha, contextDir)
if err != nil {
return err
}
defer buildContext.Close()
}
prepImage = container.NewDockerBuildExecutor(container.NewDockerBuildExecutorInput{
ContextDir: contextDir,
Dockerfile: fileName,
ImageTag: image,
BuildContext: buildContext,
Platform: rc.Config.ContainerArchitecture,
})
} else {
logger.Debugf("image '%s' for architecture '%s' already exists", image, rc.Config.ContainerArchitecture)
}
}
eval := rc.NewStepExpressionEvaluator(ctx, step)
cmd, err := shellquote.Split(eval.Interpolate(ctx, step.getStepModel().With["args"]))
if err != nil {
return err
}
if len(cmd) == 0 {
cmd = action.Runs.Args
evalDockerArgs(ctx, step, action, &cmd)
}
entrypoint := strings.Fields(eval.Interpolate(ctx, step.getStepModel().With["entrypoint"]))
if len(entrypoint) == 0 {
if action.Runs.Entrypoint != "" {
entrypoint, err = shellquote.Split(action.Runs.Entrypoint)
if err != nil {
return err
}
} else {
entrypoint = nil
}
}
stepContainer := newStepContainer(ctx, step, image, cmd, entrypoint)
return common.NewPipelineExecutor(
prepImage,
stepContainer.Pull(forcePull),
stepContainer.Remove().IfBool(!rc.Config.ReuseContainers),
stepContainer.Create(rc.Config.ContainerCapAdd, rc.Config.ContainerCapDrop),
stepContainer.Start(true),
).Finally(
stepContainer.Remove().IfBool(!rc.Config.ReuseContainers),
).Finally(stepContainer.Close())(ctx)
}
func evalDockerArgs(ctx context.Context, step step, action *model.Action, cmd *[]string) {
rc := step.getRunContext()
stepModel := step.getStepModel()
inputs := make(map[string]string)
eval := rc.NewExpressionEvaluator(ctx)
// Set Defaults
for k, input := range action.Inputs {
inputs[k] = eval.Interpolate(ctx, input.Default)
}
if stepModel.With != nil {
for k, v := range stepModel.With {
inputs[k] = eval.Interpolate(ctx, v)
}
}
mergeIntoMap(step, step.getEnv(), inputs)
stepEE := rc.NewStepExpressionEvaluator(ctx, step)
for i, v := range *cmd {
(*cmd)[i] = stepEE.Interpolate(ctx, v)
}
mergeIntoMap(step, step.getEnv(), action.Runs.Env)
ee := rc.NewStepExpressionEvaluator(ctx, step)
for k, v := range *step.getEnv() {
(*step.getEnv())[k] = ee.Interpolate(ctx, v)
}
}
func newStepContainer(ctx context.Context, step step, image string, cmd []string, entrypoint []string) container.Container {
rc := step.getRunContext()
stepModel := step.getStepModel()
rawLogger := common.Logger(ctx).WithField("raw_output", true)
logWriter := common.NewLineWriter(rc.commandHandler(ctx), func(s string) bool {
if rc.Config.LogOutput {
rawLogger.Infof("%s", s)
} else {
rawLogger.Debugf("%s", s)
}
return true
})
envList := make([]string, 0)
for k, v := range *step.getEnv() {
envList = append(envList, fmt.Sprintf("%s=%s", k, v))
}
envList = append(envList, fmt.Sprintf("%s=%s", "RUNNER_TOOL_CACHE", "/opt/hostedtoolcache"))
envList = append(envList, fmt.Sprintf("%s=%s", "RUNNER_OS", "Linux"))
envList = append(envList, fmt.Sprintf("%s=%s", "RUNNER_ARCH", container.RunnerArch(ctx)))
envList = append(envList, fmt.Sprintf("%s=%s", "RUNNER_TEMP", "/tmp"))
binds, mounts := rc.GetBindsAndMounts()
networkMode := fmt.Sprintf("container:%s", rc.jobContainerName())
if rc.IsHostEnv(ctx) {
networkMode = "default"
}
stepContainer := container.NewContainer(&container.NewContainerInput{
Cmd: cmd,
Entrypoint: entrypoint,
WorkingDir: rc.JobContainer.ToContainerPath(rc.Config.Workdir),
Image: image,
Username: rc.Config.Secrets["DOCKER_USERNAME"],
Password: rc.Config.Secrets["DOCKER_PASSWORD"],
Name: createContainerName(rc.jobContainerName(), stepModel.ID),
Env: envList,
Mounts: mounts,
NetworkMode: networkMode,
Binds: binds,
Stdout: logWriter,
Stderr: logWriter,
Privileged: rc.Config.Privileged,
UsernsMode: rc.Config.UsernsMode,
Platform: rc.Config.ContainerArchitecture,
Options: rc.Config.ContainerOptions,
})
return stepContainer
}
func populateEnvsFromSavedState(env *map[string]string, step actionStep, rc *RunContext) {
state, ok := rc.IntraActionState[step.getStepModel().ID]
if ok {
for name, value := range state {
envName := fmt.Sprintf("STATE_%s", name)
(*env)[envName] = value
}
}
}
func populateEnvsFromInput(ctx context.Context, env *map[string]string, action *model.Action, rc *RunContext) {
eval := rc.NewExpressionEvaluator(ctx)
for inputID, input := range action.Inputs {
envKey := regexp.MustCompile("[^A-Z0-9-]").ReplaceAllString(strings.ToUpper(inputID), "_")
envKey = fmt.Sprintf("INPUT_%s", envKey)
if _, ok := (*env)[envKey]; !ok {
(*env)[envKey] = eval.Interpolate(ctx, input.Default)
}
}
}
func getContainerActionPaths(step *model.Step, actionDir string, rc *RunContext) (string, string) {
actionName := ""
containerActionDir := "."
if step.Type() != model.StepTypeUsesActionRemote {
actionName = getOsSafeRelativePath(actionDir, rc.Config.Workdir)
containerActionDir = rc.JobContainer.ToContainerPath(rc.Config.Workdir) + "/" + actionName
actionName = "./" + actionName
} else if step.Type() == model.StepTypeUsesActionRemote {
actionName = getOsSafeRelativePath(actionDir, rc.ActionCacheDir())
containerActionDir = rc.JobContainer.GetActPath() + "/actions/" + actionName
}
if actionName == "" {
actionName = filepath.Base(actionDir)
if runtime.GOOS == "windows" {
actionName = strings.ReplaceAll(actionName, "\\", "/")
}
}
return actionName, containerActionDir
}
func getOsSafeRelativePath(s, prefix string) string {
actionName := strings.TrimPrefix(s, prefix)
if runtime.GOOS == "windows" {
actionName = strings.ReplaceAll(actionName, "\\", "/")
}
actionName = strings.TrimPrefix(actionName, "/")
return actionName
}
func shouldRunPreStep(step actionStep) common.Conditional {
return func(ctx context.Context) bool {
log := common.Logger(ctx)
if step.getActionModel() == nil {
log.Debugf("skip pre step for '%s': no action model available", step.getStepModel())
return false
}
return true
}
}
func hasPreStep(step actionStep) common.Conditional {
return func(ctx context.Context) bool {
action := step.getActionModel()
return action.Runs.Using == model.ActionRunsUsingComposite ||
((action.Runs.Using == model.ActionRunsUsingNode12 ||
action.Runs.Using == model.ActionRunsUsingNode16 ||
action.Runs.Using == model.ActionRunsUsingNode20) &&
action.Runs.Pre != "")
}
}
func runPreStep(step actionStep) common.Executor {
return func(ctx context.Context) error {
logger := common.Logger(ctx)
logger.Debugf("run pre step for '%s'", step.getStepModel())
rc := step.getRunContext()
stepModel := step.getStepModel()
action := step.getActionModel()
switch action.Runs.Using {
case model.ActionRunsUsingNode12, model.ActionRunsUsingNode16, model.ActionRunsUsingNode20:
// defaults in pre steps were missing, however provided inputs are available
populateEnvsFromInput(ctx, step.getEnv(), action, rc)
// todo: refactor into step
var actionDir string
var actionPath string
if _, ok := step.(*stepActionRemote); ok {
actionPath = newRemoteAction(stepModel.Uses).Path
actionDir = fmt.Sprintf("%s/%s", rc.ActionCacheDir(), safeFilename(stepModel.Uses))
} else {
actionDir = filepath.Join(rc.Config.Workdir, stepModel.Uses)
actionPath = ""
}
actionLocation := ""
if actionPath != "" {
actionLocation = path.Join(actionDir, actionPath)
} else {
actionLocation = actionDir
}
_, containerActionDir := getContainerActionPaths(stepModel, actionLocation, rc)
if err := maybeCopyToActionDir(ctx, step, actionDir, actionPath, containerActionDir); err != nil {
return err
}
containerArgs := []string{"node", path.Join(containerActionDir, action.Runs.Pre)}
logger.Debugf("executing remote job container: %s", containerArgs)
rc.ApplyExtraPath(ctx, step.getEnv())
return rc.execJobContainer(containerArgs, *step.getEnv(), "", "")(ctx)
case model.ActionRunsUsingComposite:
if step.getCompositeSteps() == nil {
step.getCompositeRunContext(ctx)
}
if steps := step.getCompositeSteps(); steps != nil && steps.pre != nil {
return steps.pre(ctx)
}
return fmt.Errorf("missing steps in composite action")
default:
return nil
}
}
}
func shouldRunPostStep(step actionStep) common.Conditional {
return func(ctx context.Context) bool {
log := common.Logger(ctx)
stepResults := step.getRunContext().getStepsContext()
stepResult := stepResults[step.getStepModel().ID]
if stepResult == nil {
log.WithField("stepResult", model.StepStatusSkipped).Debugf("skipping post step for '%s'; step was not executed", step.getStepModel())
return false
}
if stepResult.Conclusion == model.StepStatusSkipped {
log.WithField("stepResult", model.StepStatusSkipped).Debugf("skipping post step for '%s'; main step was skipped", step.getStepModel())
return false
}
if step.getActionModel() == nil {
log.WithField("stepResult", model.StepStatusSkipped).Debugf("skipping post step for '%s': no action model available", step.getStepModel())
return false
}
return true
}
}
func hasPostStep(step actionStep) common.Conditional {
return func(ctx context.Context) bool {
action := step.getActionModel()
return action.Runs.Using == model.ActionRunsUsingComposite ||
((action.Runs.Using == model.ActionRunsUsingNode12 ||
action.Runs.Using == model.ActionRunsUsingNode16 ||
action.Runs.Using == model.ActionRunsUsingNode20) &&
action.Runs.Post != "")
}
}
func runPostStep(step actionStep) common.Executor {
return func(ctx context.Context) error {
logger := common.Logger(ctx)
logger.Debugf("run post step for '%s'", step.getStepModel())
rc := step.getRunContext()
stepModel := step.getStepModel()
action := step.getActionModel()
// todo: refactor into step
var actionDir string
var actionPath string
if _, ok := step.(*stepActionRemote); ok {
actionPath = newRemoteAction(stepModel.Uses).Path
actionDir = fmt.Sprintf("%s/%s", rc.ActionCacheDir(), safeFilename(stepModel.Uses))
} else {
actionDir = filepath.Join(rc.Config.Workdir, stepModel.Uses)
actionPath = ""
}
actionLocation := ""
if actionPath != "" {
actionLocation = path.Join(actionDir, actionPath)
} else {
actionLocation = actionDir
}
_, containerActionDir := getContainerActionPaths(stepModel, actionLocation, rc)
switch action.Runs.Using {
case model.ActionRunsUsingNode12, model.ActionRunsUsingNode16, model.ActionRunsUsingNode20:
populateEnvsFromSavedState(step.getEnv(), step, rc)
containerArgs := []string{"node", path.Join(containerActionDir, action.Runs.Post)}
logger.Debugf("executing remote job container: %s", containerArgs)
rc.ApplyExtraPath(ctx, step.getEnv())
return rc.execJobContainer(containerArgs, *step.getEnv(), "", "")(ctx)
case model.ActionRunsUsingComposite:
if err := maybeCopyToActionDir(ctx, step, actionDir, actionPath, containerActionDir); err != nil {
return err
}
if steps := step.getCompositeSteps(); steps != nil && steps.post != nil {
return steps.post(ctx)
}
return fmt.Errorf("missing steps in composite action")
default:
return nil
}
}
}