From f3706ee3ea61720eccddd7df4f2dabcb67b15b79 Mon Sep 17 00:00:00 2001
From: ChristopherHX <christopher.homberger@web.de>
Date: Sun, 18 Feb 2024 04:53:22 +0100
Subject: [PATCH] refactor: simpilfy go-git cache (#2208)

---
 act/runner/action_cache.go      | 35 ++--------------
 act/runner/action_cache_test.go | 72 +++++++++++++++++++++++++--------
 2 files changed, 59 insertions(+), 48 deletions(-)

diff --git a/act/runner/action_cache.go b/act/runner/action_cache.go
index da4e651c..1099d78f 100644
--- a/act/runner/action_cache.go
+++ b/act/runner/action_cache.go
@@ -6,7 +6,6 @@ import (
 	"crypto/rand"
 	"encoding/hex"
 	"errors"
-	"fmt"
 	"io"
 	"io/fs"
 	"path"
@@ -43,17 +42,7 @@ func (c GoGitActionCache) Fetch(ctx context.Context, cacheDir, url, ref, token s
 		return "", err
 	}
 	branchName := hex.EncodeToString(tmpBranch)
-	var refSpec config.RefSpec
-	spec := config.RefSpec(ref + ":" + branchName)
-	tagOrSha := false
-	if spec.IsExactSHA1() {
-		refSpec = spec
-	} else if strings.HasPrefix(ref, "refs/") {
-		refSpec = config.RefSpec(ref + ":refs/heads/" + branchName)
-	} else {
-		tagOrSha = true
-		refSpec = config.RefSpec("refs/*/" + ref + ":refs/heads/*/" + branchName)
-	}
+
 	var auth transport.AuthMethod
 	if token != "" {
 		auth = &http.BasicAuth{
@@ -71,35 +60,17 @@ func (c GoGitActionCache) Fetch(ctx context.Context, cacheDir, url, ref, token s
 		return "", err
 	}
 	defer func() {
-		if refs, err := gogitrepo.References(); err == nil {
-			_ = refs.ForEach(func(r *plumbing.Reference) error {
-				if strings.Contains(r.Name().String(), branchName) {
-					return gogitrepo.DeleteBranch(r.Name().String())
-				}
-				return nil
-			})
-		}
+		_ = gogitrepo.DeleteBranch(branchName)
 	}()
 	if err := remote.FetchContext(ctx, &git.FetchOptions{
 		RefSpecs: []config.RefSpec{
-			refSpec,
+			config.RefSpec(ref + ":" + branchName),
 		},
 		Auth:  auth,
 		Force: true,
 	}); err != nil {
-		if tagOrSha && errors.Is(err, git.NoErrAlreadyUpToDate) {
-			return "", fmt.Errorf("couldn't find remote ref \"%s\"", ref)
-		}
 		return "", err
 	}
-	if tagOrSha {
-		for _, prefix := range []string{"refs/heads/tags/", "refs/heads/heads/"} {
-			hash, err := gogitrepo.ResolveRevision(plumbing.Revision(prefix + branchName))
-			if err == nil {
-				return hash.String(), nil
-			}
-		}
-	}
 	hash, err := gogitrepo.ResolveRevision(plumbing.Revision(branchName))
 	if err != nil {
 		return "", err
diff --git a/act/runner/action_cache_test.go b/act/runner/action_cache_test.go
index e222cfb9..58fac5bd 100644
--- a/act/runner/action_cache_test.go
+++ b/act/runner/action_cache_test.go
@@ -18,20 +18,60 @@ func TestActionCache(t *testing.T) {
 		Path: os.TempDir(),
 	}
 	ctx := context.Background()
-	sha, err := cache.Fetch(ctx, "christopherhx/script", "https://github.com/christopherhx/script", "main", "")
-	a.NoError(err)
-	a.NotEmpty(sha)
-	atar, err := cache.GetTarArchive(ctx, "christopherhx/script", sha, "node_modules")
-	a.NoError(err)
-	a.NotEmpty(atar)
-	mytar := tar.NewReader(atar)
-	th, err := mytar.Next()
-	a.NoError(err)
-	a.NotEqual(0, th.Size)
-	buf := &bytes.Buffer{}
-	// G110: Potential DoS vulnerability via decompression bomb (gosec)
-	_, err = io.Copy(buf, mytar)
-	a.NoError(err)
-	str := buf.String()
-	a.NotEmpty(str)
+	cacheDir := "nektos/act-test-actions"
+	repo := "https://github.com/nektos/act-test-actions"
+	refs := []struct {
+		Name     string
+		CacheDir string
+		Repo     string
+		Ref      string
+	}{
+		{
+			Name:     "Fetch Branch Name",
+			CacheDir: cacheDir,
+			Repo:     repo,
+			Ref:      "main",
+		},
+		{
+			Name:     "Fetch Branch Name Absolutely",
+			CacheDir: cacheDir,
+			Repo:     repo,
+			Ref:      "refs/heads/main",
+		},
+		{
+			Name:     "Fetch HEAD",
+			CacheDir: cacheDir,
+			Repo:     repo,
+			Ref:      "HEAD",
+		},
+		{
+			Name:     "Fetch Sha",
+			CacheDir: cacheDir,
+			Repo:     repo,
+			Ref:      "de984ca37e4df4cb9fd9256435a3b82c4a2662b1",
+		},
+	}
+	for _, c := range refs {
+		t.Run(c.Name, func(t *testing.T) {
+			sha, err := cache.Fetch(ctx, c.CacheDir, c.Repo, c.Ref, "")
+			if !a.NoError(err) || !a.NotEmpty(sha) {
+				return
+			}
+			atar, err := cache.GetTarArchive(ctx, c.CacheDir, sha, "js")
+			if !a.NoError(err) || !a.NotEmpty(atar) {
+				return
+			}
+			mytar := tar.NewReader(atar)
+			th, err := mytar.Next()
+			if !a.NoError(err) || !a.NotEqual(0, th.Size) {
+				return
+			}
+			buf := &bytes.Buffer{}
+			// G110: Potential DoS vulnerability via decompression bomb (gosec)
+			_, err = io.Copy(buf, mytar)
+			a.NoError(err)
+			str := buf.String()
+			a.NotEmpty(str)
+		})
+	}
 }