fix: use actions/runner hashfiles in container (#1940)

* fix: use actions/runner hashfiles in container

Previously hashfiles ran on the host,
this don't work for container generated content

* fix: lint

* fix: lint

* fix assign follow symlink flag

Co-authored-by: Jason Song <i@wolfogre.com>

---------

Co-authored-by: Jason Song <i@wolfogre.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

pkg/exprparser/interpreter.go

@@ -24,6 +24,7 @@ type EvaluationEnvironment struct {
 	Matrix    map[string]interface{}
 	Needs     map[string]Needs
 	Inputs    map[string]interface{}
+	HashFiles func([]reflect.Value) (interface{}, error)
 }
 
 type Needs struct {
@@ -607,6 +608,9 @@ func (impl *interperterImpl) evaluateFuncCall(funcCallNode *actionlint.FuncCallN
 	case "fromjson":
 		return impl.fromJSON(args[0])
 	case "hashfiles":
+		if impl.env.HashFiles != nil {
+			return impl.env.HashFiles(args)
+		}
 		return impl.hashFiles(args...)
 	case "always":
 		return impl.always()

pkg/runner/expression.go

@@ -1,12 +1,19 @@
 package runner
 
 import (
+	"bytes"
 	"context"
 	"fmt"
+	"path"
+	"reflect"
 	"regexp"
 	"strings"
+	"time"
+
+	_ "embed"
 
 	"github.com/nektos/act/pkg/common"
+	"github.com/nektos/act/pkg/container"
 	"github.com/nektos/act/pkg/exprparser"
 	"github.com/nektos/act/pkg/model"
 	"gopkg.in/yaml.v3"
@@ -82,6 +89,7 @@ func (rc *RunContext) NewExpressionEvaluatorWithEnv(ctx context.Context, env map
 		Matrix:    rc.Matrix,
 		Needs:     using,
 		Inputs:    inputs,
+		HashFiles: getHashFilesFunction(ctx, rc),
 	}
 	if rc.JobContainer != nil {
 		ee.Runner = rc.JobContainer.GetRunnerContext(ctx)
@@ -95,6 +103,9 @@ func (rc *RunContext) NewExpressionEvaluatorWithEnv(ctx context.Context, env map
 	}
 }
 
+//go:embed hashfiles/index.js
+var hashfiles string
+
 // NewExpressionEvaluator creates a new evaluator
 func (rc *RunContext) NewStepExpressionEvaluator(ctx context.Context, step step) ExpressionEvaluator {
 	// todo: cleanup EvaluationEnvironment creation
@@ -132,6 +143,7 @@ func (rc *RunContext) NewStepExpressionEvaluator(ctx context.Context, step step)
 		// todo: should be unavailable
 		// but required to interpolate/evaluate the inputs in actions/composite
 		Inputs:    inputs,
+		HashFiles: getHashFilesFunction(ctx, rc),
 	}
 	if rc.JobContainer != nil {
 		ee.Runner = rc.JobContainer.GetRunnerContext(ctx)
@@ -145,6 +157,67 @@ func (rc *RunContext) NewStepExpressionEvaluator(ctx context.Context, step step)
 	}
 }
 
+func getHashFilesFunction(ctx context.Context, rc *RunContext) func(v []reflect.Value) (interface{}, error) {
+	hashFiles := func(v []reflect.Value) (interface{}, error) {
+		if rc.JobContainer != nil {
+			timeed, cancel := context.WithTimeout(ctx, time.Minute)
+			defer cancel()
+			name := "workflow/hashfiles/index.js"
+			hout := &bytes.Buffer{}
+			herr := &bytes.Buffer{}
+			patterns := []string{}
+			followSymlink := false
+
+			for i, p := range v {
+				s := p.String()
+				if i == 0 {
+					if strings.HasPrefix(s, "--") {
+						if strings.EqualFold(s, "--follow-symbolic-links") {
+							followSymlink = true
+							continue
+						}
+						return "", fmt.Errorf("Invalid glob option %s, available option: '--follow-symbolic-links'", s)
+					}
+				}
+				patterns = append(patterns, s)
+			}
+			env := map[string]string{}
+			for k, v := range rc.Env {
+				env[k] = v
+			}
+			env["patterns"] = strings.Join(patterns, "\n")
+			if followSymlink {
+				env["followSymbolicLinks"] = "true"
+			}
+
+			stdout, stderr := rc.JobContainer.ReplaceLogWriter(hout, herr)
+			_ = rc.JobContainer.Copy(rc.JobContainer.GetActPath(), &container.FileEntry{
+				Name: name,
+				Mode: 0o644,
+				Body: hashfiles,
+			}).
+				Then(rc.execJobContainer([]string{"node", path.Join(rc.JobContainer.GetActPath(), name)},
+					env, "", "")).
+				Finally(func(context.Context) error {
+					rc.JobContainer.ReplaceLogWriter(stdout, stderr)
+					return nil
+				})(timeed)
+			output := hout.String() + "\n" + herr.String()
+			guard := "__OUTPUT__"
+			outstart := strings.Index(output, guard)
+			if outstart != -1 {
+				outstart += len(guard)
+				outend := strings.Index(output[outstart:], guard)
+				if outend != -1 {
+					return output[outstart : outstart+outend], nil
+				}
+			}
+		}
+		return "", nil
+	}
+	return hashFiles
+}
+
 type expressionEvaluator struct {
 	interpreter exprparser.Interpreter
 }