act_runner/act/runner/step_action_local.go

// Copyright 2022 The Gitea Authors. All rights reserved.
// Copyright 2022 The nektos/act Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package runner

import (
	"archive/tar"
	"context"
	"errors"
	"fmt"
	"io"
	"io/fs"
	"os"
	"path"
	"path/filepath"

	"gitea.com/gitea/runner/act/common"

	"gitea.dev/actionslib/pkg/model"
)

type stepActionLocal struct {
	Step                *model.Step
	RunContext          *RunContext
	compositeRunContext *RunContext
	compositeSteps      *compositeSteps
	runAction           runAction
	readAction          readAction
	env                 map[string]string
	action              *model.Action
}

func (sal *stepActionLocal) pre() common.Executor {
	sal.env = map[string]string{}
	return common.NewPipelineExecutor()
}

func (sal *stepActionLocal) main() common.Executor {
	return runStepExecutor(sal, stepStageMain, func(ctx context.Context) error {
		if common.Dryrun(ctx) {
			return nil
		}

		printRunActionHeader(ctx, sal.Step, sal.env, sal.getRunContext())
		rawLogger := common.Logger(ctx).With(rawOutputField, true)
		defer rawLogger.Infof("::endgroup::")

		actionDir := filepath.Join(sal.getRunContext().Config.Workdir, sal.Step.Uses)
		_, containerActionPath := getContainerActionPaths(sal)

		localReader := func(filename string) (io.Reader, io.Closer, error) {
			spath := path.Join(containerActionPath, filename)
			for range maxSymlinkDepth {
				tars, err := sal.RunContext.JobContainer.GetContainerArchive(ctx, spath)
				if errors.Is(err, fs.ErrNotExist) {
					return nil, nil, err
				} else if err != nil {
					return nil, nil, fs.ErrNotExist
				}
				treader := tar.NewReader(tars)
				header, err := treader.Next()
				if errors.Is(err, io.EOF) {
					tars.Close()
					return nil, nil, os.ErrNotExist
				} else if err != nil {
					tars.Close()
					return nil, nil, err
				}
				if header.FileInfo().Mode()&os.ModeSymlink == os.ModeSymlink {
					tars.Close()
					spath, err = symlinkJoin(spath, header.Linkname, containerActionPath)
					if err != nil {
						return nil, nil, err
					}
				} else {
					return treader, tars, nil
				}
			}
			return nil, nil, fmt.Errorf("max depth %d of symlinks exceeded while reading %s", maxSymlinkDepth, spath)
		}

		actionModel, err := sal.readAction(ctx, sal.Step, actionDir, "", localReader, os.WriteFile)
		if err != nil {
			return err
		}

		sal.action = actionModel

		return sal.runAction(sal, actionDir, nil)(ctx)
	})
}

func (sal *stepActionLocal) post() common.Executor {
	return runStepExecutor(sal, stepStagePost, runPostStep(sal)).If(hasPostStep(sal)).If(shouldRunPostStep(sal))
}

func (sal *stepActionLocal) getRunContext() *RunContext {
	return sal.RunContext
}

func (sal *stepActionLocal) getGithubContext(ctx context.Context) *model.GithubContext {
	return sal.getRunContext().getGithubContext(ctx)
}

func (sal *stepActionLocal) getStepModel() *model.Step {
	return sal.Step
}

func (sal *stepActionLocal) getEnv() *map[string]string {
	return &sal.env
}

func (sal *stepActionLocal) getIfExpression(_ context.Context, stage stepStage) string {
	switch stage {
	case stepStageMain:
		return sal.Step.If.Value
	case stepStagePost:
		return sal.action.Runs.PostIf
	}
	return ""
}

func (sal *stepActionLocal) getActionModel() *model.Action {
	return sal.action
}

func (sal *stepActionLocal) getCompositeRunContext(ctx context.Context) (*RunContext, error) {
	if sal.compositeRunContext == nil {
		_, containerActionDir := getContainerActionPaths(sal)

		compositeRunContext, err := newCompositeRunContext(ctx, sal.RunContext, sal, containerActionDir)
		if err != nil {
			return nil, err
		}
		sal.compositeRunContext = compositeRunContext
		sal.compositeSteps = compositeRunContext.compositeExecutor(sal.action)
	}
	return sal.compositeRunContext, nil
}

func (sal *stepActionLocal) getCompositeSteps() *compositeSteps {
	return sal.compositeSteps
}