fix: prevent masking gaps in workflow command logs

Normalize displayed command payloads so partial escaping cannot bypass masking,
and retain complete one-character masks.

Assisted-by: Codex:GPT-6

DEVELOPMENT.md

@@ -23,11 +23,14 @@ depending on the prefix:
   covers both forms: it escapes `%` first, so a literal `%3B` becomes `%253B` that the extra
   `##[…]` rules cannot match, and a raw `;` or `]` is never decoded. It is also what makes
   multi-line work, `\n` becomes `%0A` and the UI turns it back into a line break.
-- **Forwarding a command from step output?** Leave the payload alone, it arrived escaped and is
+- **Forwarding a command from step output?** Preserve its escaping unless masking changes it.
-  decoded once. Decoding here double-decodes and destroys multi-line.
+  Decoding for display happens in the UI.
 - **No prefix?** Do not escape, and split multi-line values into one row each.
-- **Interpolating a secret?** Masking runs after escaping, so `AppendSecretMasker` registers the
+- **Interpolating a secret?** Masking runs after escaping. Recognised command payloads are
-  encoded forms too.
+  normalised before masking to cover partially escaped values. Their original escaping is
+  preserved when no replacement occurs. `AppendSecretMasker` also registers encoded forms for
+  other output. Complete nonblank one-character values are masked, while one-byte fragments
+  of multiline values are skipped.
 - Command *properties* also escape `%3A` and `%2C`, which the UI never decodes, so the command
   handler folds an annotation's location into its decoded message and escapes the result again.
 

act/artifactcache/handler_test.go

@@ -851,9 +851,6 @@ func TestHandler_touchCacheSkipsFreshCompletedEntries(t *testing.T) {
 func newTestHandler(t *testing.T, policy Policy, entries ...*Cache) *Handler {
 	t.Helper()
 	handler := startTestHandler(t, Options{Policy: policy})
-	if len(entries) == 0 {
-		return handler
-	}
 
 	db, err := handler.openDB()
 	require.NoError(t, err)
@@ -943,10 +940,6 @@ func TestHandler_RejectsBearer(t *testing.T) {
 
 func TestHandler_UnregisterRevokes(t *testing.T) {
 	t.Parallel()
-	handler, err := StartHandler(Options{Dir: filepath.Join(t.TempDir(), "artifactcache")})
-	require.NoError(t, err)
-	defer handler.Close()
-
 	for _, tc := range []struct {
 		name          string
 		token         string
@@ -957,6 +950,9 @@ func TestHandler_UnregisterRevokes(t *testing.T) {
 		{"reference counted", "shared", "v", 2},
 	} {
 		t.Run(tc.name, func(t *testing.T) {
+			handler, err := StartHandler(Options{Dir: filepath.Join(t.TempDir(), "artifactcache")})
+			require.NoError(t, err)
+			defer handler.Close()
 			revokers := make([]func(), tc.registrations)
 			for i := range revokers {
 				revokers[i] = handler.RegisterJob(tc.token, JobCredential{Repo: testRepo})
@@ -1053,8 +1049,9 @@ func TestHandler_ArtifactSignature(t *testing.T) {
 
 	base := handler.ExternalURL() + apiPath
 	good := signArtifactURL(handler, 1)
-	secret := bytes.Clone(handler.secret)
+	other, err := StartHandler(Options{Dir: filepath.Join(t.TempDir(), "artifactcache2")})
-	secret[0] ^= 1
+	require.NoError(t, err)
+	defer other.Close()
 
 	for _, tc := range []struct {
 		name string
@@ -1063,7 +1060,7 @@ func TestHandler_ArtifactSignature(t *testing.T) {
 		{"missing signature", fmt.Sprintf("%s/artifacts/%d", base, 1)},
 		{"tampered signature", good[:len(good)-4] + "dead"},
 		{"expired signature", handler.signedArtifactURL(JobCredential{}, 1, time.Now().Add(-time.Second))},
-		{"signature from a different server", base + strings.SplitN(signArtifactURL(&Handler{secret: secret}, 1), apiPath, 2)[1]},
+		{"signature from a different server", base + strings.SplitN(signArtifactURL(other, 1), apiPath, 2)[1]},
 	} {
 		t.Run(tc.name, func(t *testing.T) {
 			resp, err := testClient.Get(tc.url)

act/common/git/fetch_action_test.go

@@ -36,7 +36,7 @@ func TestFetchAction(t *testing.T) {
 
 	root := t.TempDir()
 	remote := filepath.Join(root, "org", "action")
-	require.NoError(t, os.CopyFS(remote, os.DirFS(filepath.Join(gitFixtureDir, "work"))))
+	require.NoError(t, gitCmd("init", "--initial-branch=main", remote))
 	require.NoError(t, os.WriteFile(filepath.Join(remote, "action.yml"), []byte("name: action\n"), 0o644))
 	require.NoError(t, os.WriteFile(filepath.Join(remote, "run.sh"), []byte("#!/bin/sh\n"), 0o755))
 	require.NoError(t, os.Symlink("action.yml", filepath.Join(remote, "link")))
@@ -53,7 +53,6 @@ func TestFetchAction(t *testing.T) {
 	var archiveRequests []http.Header
 	var mirror *httptest.Server
 	archiveCache := map[string][]byte{}
-	revisions := map[string]string{}
 	requests, archives, failures := 0, "", 0
 	handler := http.HandlerFunc(func(writer http.ResponseWriter, request *http.Request) {
 		mu.Lock()
@@ -80,14 +79,7 @@ func TestFetchAction(t *testing.T) {
 			http.Redirect(writer, request, mirror.URL+request.URL.Path, http.StatusFound)
 			return
 		}
-		sha, ok := revisions[ref]
+		sha, _ := gitOutput(request.Context(), remote, "rev-parse", strings.TrimSuffix(ref, ".tar.gz"))
-		if !ok {
-			var err error
-			sha, err = gitOutput(request.Context(), remote, "rev-parse", strings.TrimSuffix(ref, ".tar.gz"))
-			if err == nil {
-				revisions[ref] = sha
-			}
-		}
 		etag := fmt.Sprintf(`W/"%s-tar.gz-%t"`, sha, archives != "unprefixed")
 		if request.Header.Get("If-None-Match") == etag {
 			writer.WriteHeader(http.StatusNotModified)
@@ -216,9 +208,6 @@ func TestFetchAction(t *testing.T) {
 		require.NoError(t, gitCmd("-C", remote, "commit", "--allow-empty", "-m", "moved"))
 		require.NoError(t, gitCmd("-C", remote, "tag", "--force", "v1"))
 		expectedSha = gitRevParse(t, remote, "v1")
-		mu.Lock()
-		clear(revisions)
-		mu.Unlock()
 		moved, movedSha, err := FetchAction(t.Context(), input)
 		require.NoError(t, err)
 		assert.Equal(t, expectedSha, movedSha)
@@ -264,7 +253,7 @@ func TestFetchAction(t *testing.T) {
 	})
 
 	t.Run("downloads again over a tree whose files changed size or that has no record, not under a job copying it", func(t *testing.T) {
-		sha := expectedSha
+		sha := gitRevParse(t, remote, "main")
 		for _, mode := range []string{"prefixed", "none"} {
 			serve(mode, 0)
 			input := newInput(sha)

act/common/git/git_test.go

@@ -112,7 +112,8 @@ func TestFindGitMetadataOfSHA256RepositoryUsesOrigin(t *testing.T) {
 	t.Parallel()
 	basedir := t.TempDir()
 	const remoteURL = "https://github.com/owner/repo.git"
-	require.NoError(t, gitCmd("init", "--template=", "--object-format=sha256", "--initial-branch=main", basedir))
+	require.NoError(t, gitCmd("init", "--object-format=sha256", "--initial-branch=main", basedir))
+	require.NoError(t, os.RemoveAll(filepath.Join(basedir, ".git", "hooks")))
 	require.NoError(t, gitCmd("-C", basedir, "commit", "--allow-empty", "-m", "init"))
 	require.NoError(t, gitCmd("-C", basedir, "remote", "add", "origin", remoteURL))
 	require.NoError(t, gitCmd("-C", basedir, "config", "--add", "remote.origin.url", "https://github.com/other/repo.git"))
@@ -204,13 +205,16 @@ func TestGitCloneExecutor(t *testing.T) {
 	require.NoError(t, gitCmd("-C", workDir, "add", "action.sh", ".gitattributes"))
 	require.NoError(t, gitCmd("-C", workDir, "commit", "-m", "initial"))
 	require.NoError(t, gitCmd("-C", workDir, "tag", "v2"))
+	require.NoError(t, gitCmd("-C", workDir, "push", "-u", "origin", "main"))
+	require.NoError(t, gitCmd("-C", workDir, "push", "origin", "v2"))
 
 	require.NoError(t, gitCmd("-C", workDir, "checkout", "-b", "act-fails"))
 	require.NoError(t, gitCmd("-C", workDir, "commit", "--allow-empty", "-m", "branch-commit"))
+	require.NoError(t, gitCmd("-C", workDir, "push", "origin", "act-fails"))
 
 	fullSha := gitRevParse(t, workDir, "main")
 
-	require.NoError(t, gitCmd("-C", workDir, "push", "-u", "origin", "main", "v2", "act-fails", "main:refs/heads/"+fullSha[:4]))
+	require.NoError(t, gitCmd("-C", workDir, "push", "origin", "main:refs/heads/"+fullSha[:4]))
 
 	hostConfig := filepath.Join(t.TempDir(), "gitconfig")
 	require.NoError(t, os.WriteFile(hostConfig, []byte("[core]\n\tautocrlf = true\n\teol = crlf\n[url "+strconv.Quote(remoteDir)+"]\n\tinsteadOf = https://example.invalid/action\n"), 0o644))
@@ -278,10 +282,10 @@ func TestGitCloneExecutor(t *testing.T) {
 func TestGitCloneExecutorReclonesWhenOriginURLChanges(t *testing.T) {
 	t.Parallel()
 	createRemote := func(message string) string {
-		dir := t.TempDir()
+		remoteDir, workDir := newGitRemote(t, message)
-		require.NoError(t, os.CopyFS(dir, os.DirFS(filepath.Join(gitFixtureDir, "work"))))
+		require.NoError(t, gitCmd("-C", workDir, "push", "-u", "origin", "main"))
-		require.NoError(t, gitCmd("-C", dir, "commit", "--allow-empty", "-m", message))
+
-		return dir
+		return remoteDir
 	}
 
 	oldRemoteDir := createRemote("old-action")
@@ -401,30 +405,31 @@ func TestGitCloneExecutorShallow(t *testing.T) {
 	remoteDir, workDir := newGitRemote(t, "c1", "c2", "c3")
 	require.NoError(t, gitCmd("-C", workDir, "tag", "v1"))
 	unadvertisedSHA := gitRevParse(t, workDir, "HEAD~1")
-	require.NoError(t, gitCmd("-C", workDir, "push", "-u", "origin", "main", "v1"))
+	require.NoError(t, gitCmd("-C", workDir, "push", "-u", "origin", "main"))
+	require.NoError(t, gitCmd("-C", workDir, "push", "origin", "v1"))
 
 	shallowMarker := func(dir string) string { return filepath.Join(dir, ".git", "shallow") }
 
 	for name, ref := range map[string]string{"branch is cloned shallowly": "main", "tag is cloned shallowly": "v1"} {
 		t.Run(name, func(t *testing.T) {
-			t.Parallel()
 			dir := t.TempDir()
 			require.NoError(t, NewGitCloneExecutor(NewGitCloneExecutorInput{
 				URL: remoteDir, Ref: ref, Dir: dir, Depth: 1,
 			})(t.Context()))
 			assert.FileExists(t, shallowMarker(dir), "clone should be shallow")
-			assert.Equal(t, []string{"c3"}, gitSubjects(t, dir), "only the tip commit should be present")
+			assert.Equal(t, 1, gitRevCount(t, dir), "only the tip commit should be present")
+			assert.Equal(t, "c3", gitHeadSubject(t, dir))
 		})
 	}
 
 	unadvertisedRemote := func(t *testing.T, allowUnadvertised bool) string {
 		remote := filepath.Join(t.TempDir(), "remote.git")
-		require.NoError(t, gitCmd("clone", "--bare", "--template=", "--config", "uploadpack.allowAnySHA1InWant="+strconv.FormatBool(allowUnadvertised), remoteDir, remote))
+		require.NoError(t, gitCmd("clone", "--bare", remoteDir, remote))
+		require.NoError(t, gitCmd("-C", remote, "config", "uploadpack.allowAnySHA1InWant", strconv.FormatBool(allowUnadvertised)))
 		return remote
 	}
 
 	t.Run("commit hash resolves when the remote accepts a direct shallow fetch", func(t *testing.T) {
-		t.Parallel()
 		dir := t.TempDir()
 		require.NoError(t, NewGitCloneExecutor(NewGitCloneExecutorInput{
 			URL: unadvertisedRemote(t, false), Ref: unadvertisedSHA, Dir: dir, Depth: 1,
@@ -433,7 +438,6 @@ func TestGitCloneExecutorShallow(t *testing.T) {
 	})
 
 	t.Run("commit hash is fetched shallowly, moved to another hash, then reused without reaching the remote", func(t *testing.T) {
-		t.Parallel()
 		remote := unadvertisedRemote(t, true)
 		dir := t.TempDir()
 		cloneAt := func(ref string) error {
@@ -444,7 +448,7 @@ func TestGitCloneExecutorShallow(t *testing.T) {
 
 		require.NoError(t, cloneAt(unadvertisedSHA))
 		assert.FileExists(t, shallowMarker(dir))
-		assert.Len(t, gitSubjects(t, dir), 1)
+		assert.Equal(t, 1, gitRevCount(t, dir))
 		assert.Equal(t, unadvertisedSHA, gitRevParse(t, dir, "HEAD"))
 
 		olderSHA := gitRevParse(t, workDir, "HEAD~2")
@@ -457,8 +461,6 @@ func TestGitCloneExecutorShallow(t *testing.T) {
 	})
 
 	t.Run("moving hexadecimal-named branch updates while staying shallow", func(t *testing.T) {
-		t.Parallel()
-		remoteDir, workDir := newGitRemote(t, "c2", "c3")
 		require.NoError(t, gitCmd("-C", workDir, "push", "origin", "main:deadbeef"))
 		dir := t.TempDir()
 		clone := NewGitCloneExecutor(NewGitCloneExecutorInput{
@@ -471,17 +473,19 @@ func TestGitCloneExecutorShallow(t *testing.T) {
 		require.NoError(t, gitCmd("-C", workDir, "push", "origin", "main:deadbeef"))
 
 		require.NoError(t, clone(t.Context()))
-		assert.Equal(t, []string{"c4"}, gitSubjects(t, dir), "reused shallow clone should update to the new tip")
+		assert.Equal(t, "c4", gitHeadSubject(t, dir), "reused shallow clone should update to the new tip")
 		assert.FileExists(t, shallowMarker(dir), "repo should remain shallow after update")
+		assert.Equal(t, 1, gitRevCount(t, dir))
 	})
 
 	t.Run("sha256 full hash is cloned shallowly, reused without the remote, and its 40-character prefix is short", func(t *testing.T) {
-		t.Parallel()
 		remote := filepath.Join(t.TempDir(), "remote.git")
+		require.NoError(t, gitCmd("init", "--bare", "--object-format=sha256", "--initial-branch=main", remote))
 		work := t.TempDir()
-		require.NoError(t, gitCmd("init", "--template=", "--object-format=sha256", "--initial-branch=main", work))
+		require.NoError(t, gitCmd("init", "--object-format=sha256", "--initial-branch=main", work))
+		require.NoError(t, gitCmd("-C", work, "remote", "add", "origin", remote))
 		require.NoError(t, gitCmd("-C", work, "commit", "--allow-empty", "-m", "pinned"))
-		require.NoError(t, gitCmd("clone", "--bare", "--template=", work, remote))
+		require.NoError(t, gitCmd("-C", work, "push", "origin", "main"))
 		sha := gitRevParse(t, work, "HEAD")
 		dir := t.TempDir()
 		clone := NewGitCloneExecutor(NewGitCloneExecutorInput{URL: remote, Ref: sha, Dir: dir, Depth: 1})
@@ -500,11 +504,11 @@ func TestGitCloneExecutorPinnedHashIgnoresShadowingRef(t *testing.T) {
 	pinned := gitRevParse(t, workDir, "HEAD")
 	require.NoError(t, gitCmd("-C", workDir, "commit", "--allow-empty", "-m", "decoy"))
 	require.NoError(t, gitCmd("-C", workDir, "tag", pinned))
-	require.NoError(t, gitCmd("-C", workDir, "push", "-u", "origin", "main", pinned))
+	require.NoError(t, gitCmd("-C", workDir, "push", "-u", "origin", "main"))
+	require.NoError(t, gitCmd("-C", workDir, "push", "origin", pinned))
 
 	for name, depth := range map[string]int{"shallow": 1, "full clone": 0} {
 		t.Run(name, func(t *testing.T) {
-			t.Parallel()
 			dir := t.TempDir()
 			require.NoError(t, NewGitCloneExecutor(NewGitCloneExecutorInput{
 				URL: remoteDir, Ref: pinned, Dir: dir, Depth: depth,
@@ -536,11 +540,13 @@ func gitRevParse(t *testing.T, dir, rev string) string {
 	return strings.TrimSpace(string(out))
 }
 
-func gitSubjects(t *testing.T, dir string) []string {
+func gitRevCount(t *testing.T, dir string) int {
 	t.Helper()
-	out, err := exec.Command("git", "-C", dir, "log", "--format=%s").Output()
+	out, err := exec.Command("git", "-C", dir, "rev-list", "--count", "HEAD").Output()
 	require.NoError(t, err)
-	return strings.Split(strings.TrimSpace(string(out)), "\n")
+	n, err := strconv.Atoi(strings.TrimSpace(string(out)))
+	require.NoError(t, err)
+	return n
 }
 
 func gitHeadSubject(t *testing.T, dir string) string {
@@ -674,7 +680,7 @@ func TestNewGitCloneExecutorFetchSendsTokenAndHonoursContext(t *testing.T) {
 	})
 
 	dir := filepath.Join(t.TempDir(), "cached-action")
-	require.NoError(t, os.CopyFS(dir, os.DirFS(filepath.Join(gitFixtureDir, "work"))))
+	require.NoError(t, gitCmd("init", dir))
 	require.NoError(t, gitCmd("-C", dir, "remote", "add", "origin", server.URL))
 
 	ctx, cancel := context.WithCancel(t.Context())

act/container/docker_build_test.go

@@ -42,11 +42,11 @@ func TestDockerBuildLabelsImageWithItsTagAndReportsDaemonError(t *testing.T) {
 
 func TestCreateBuildContextFollowsDockerignoreAndSymlinkedRootButKeepsDockerfile(t *testing.T) {
 	dir := t.TempDir()
-	require.NoError(t, os.Mkdir(filepath.Join(dir, "build"), 0o755))
 	for name, content := range map[string]string{
 		".dockerignore": "*.log\nbuild\n!build/keep.txt\nDockerfile", "Dockerfile": "FROM scratch", "a.txt": "a",
 		"a.log": "log", "build/drop.txt": "drop", "build/keep.txt": "keep",
 	} {
+		require.NoError(t, os.MkdirAll(filepath.Join(dir, filepath.Dir(name)), 0o755))
 		require.NoError(t, os.WriteFile(filepath.Join(dir, name), []byte(content), 0o644))
 	}
 	require.NoError(t, os.Mkdir(filepath.Join(dir, "empty"), 0o755))

act/container/docker_run_test.go

@@ -540,9 +540,6 @@ func TestRejectsMissingContainer(t *testing.T) {
 }
 
 func TestPublicCopyPipelineHandlesStaleID(t *testing.T) {
-	source := t.TempDir()
-	require.NoError(t, os.WriteFile(filepath.Join(source, "x"), nil, 0o644))
-
 	for _, testcase := range []struct {
 		name, destination, extractionRoot, entry string
 		directory                                bool
@@ -570,6 +567,8 @@ func TestPublicCopyPipelineHandlesStaleID(t *testing.T) {
 
 			cr := &containerReference{id: "stale", cli: client, input: &NewContainerInput{Name: "job-1"}}
 			if testcase.directory {
+				source := t.TempDir()
+				require.NoError(t, os.WriteFile(filepath.Join(source, "x"), nil, 0o644))
 				require.NoError(t, cr.CopyDir(testcase.destination, source+string(filepath.Separator), false, true)(ctx))
 			} else {
 				require.NoError(t, cr.Copy(testcase.destination, &FileEntry{Name: "x", Mode: 0o644})(ctx))
@@ -1109,10 +1108,6 @@ func TestConnectTakesDaemonOSFromPing(t *testing.T) {
 }
 
 func TestContainerCopyModes(t *testing.T) {
-	source := t.TempDir()
-	require.NoError(t, os.WriteFile(filepath.Join(source, "run.sh"), []byte("#!/bin/sh\n"), 0o666))
-	require.NoError(t, os.Chmod(filepath.Join(source, "run.sh"), 0o666))
-
 	for _, testcase := range []struct {
 		hostOS, serverOS string
 		expected         int64
@@ -1122,6 +1117,9 @@ func TestContainerCopyModes(t *testing.T) {
 		{"linux", "linux", 0o666},
 	} {
 		t.Run(testcase.hostOS+"-"+testcase.serverOS, func(t *testing.T) {
+			source := t.TempDir()
+			require.NoError(t, os.WriteFile(filepath.Join(source, "run.sh"), []byte("#!/bin/sh\n"), 0o666))
+			require.NoError(t, os.Chmod(filepath.Join(source, "run.sh"), 0o666))
 			file := &FileEntry{Name: "run.sh", Mode: 0o600, Body: "#!/bin/sh\n"}
 			original := hostOS
 			hostOS = testcase.hostOS

act/container/host_environment_test.go

@@ -32,11 +32,6 @@ func TestActionPlatformNames(t *testing.T) {
 }
 
 func TestCopyDir(t *testing.T) {
-	src := filepath.Join(t.TempDir(), "action")
-	require.NoError(t, os.MkdirAll(filepath.Join(src, ".git", "objects"), 0o700))
-	require.NoError(t, os.WriteFile(filepath.Join(src, ".git", "objects", "pack"), []byte("x"), 0o600))
-	require.NoError(t, os.WriteFile(filepath.Join(src, "action.yml"), []byte("name: x\n"), 0o600))
-
 	for _, test := range []struct {
 		name                     string
 		useGitIgnore, skipGitDir bool
@@ -46,6 +41,11 @@ func TestCopyDir(t *testing.T) {
 		{name: "unfiltered outside a git repository", useGitIgnore: true},
 	} {
 		t.Run(test.name, func(t *testing.T) {
+			src := filepath.Join(t.TempDir(), "action")
+			require.NoError(t, os.MkdirAll(filepath.Join(src, ".git", "objects"), 0o700))
+			require.NoError(t, os.WriteFile(filepath.Join(src, ".git", "objects", "pack"), []byte("x"), 0o600))
+			require.NoError(t, os.WriteFile(filepath.Join(src, "action.yml"), []byte("name: x\n"), 0o600))
+
 			dest := filepath.Join(t.TempDir(), "dest")
 			require.NoError(t, (&HostEnvironment{}).CopyDir(dest, src+string(filepath.Separator), test.useGitIgnore, test.skipGitDir)(t.Context()))
 

act/container/parse_env_file_test.go

@@ -5,7 +5,6 @@ package container
 
 import (
 	"bufio"
-	"bytes"
 	"os"
 	"path/filepath"
 	"strings"
@@ -16,9 +15,14 @@ import (
 	"golang.org/x/text/encoding/unicode"
 )
 
+func newTestHostEnv(t *testing.T) (*HostEnvironment, string) {
+	t.Helper()
+	e := &HostEnvironment{Path: t.TempDir()}
+	return e, filepath.Join(e.Path, "envfile")
+}
+
 func TestParseEnvFile(t *testing.T) {
 	t.Parallel()
-	hostEnv := &HostEnvironment{Path: t.TempDir()}
 	largeValue := strings.Repeat("x", 2*1024*1024)
 	encodeUTF16 := func(endianness unicode.Endianness) string {
 		content, err := unicode.UTF16(endianness, unicode.UseBOM).NewEncoder().Bytes([]byte("FOO=bar\r\nMULTI<<EOF\r\nline1\r\nEOF\r\n"))
@@ -47,15 +51,15 @@ func TestParseEnvFile(t *testing.T) {
 		{"UTF16 big endian", encodeUTF16(unicode.BigEndian), map[string]string{"FOO": "bar\r", "MULTI": "line1\r"}},
 	} {
 		t.Run(test.name, func(t *testing.T) {
-			envPath := filepath.Join(hostEnv.Path, test.name)
+			e, envPath := newTestHostEnv(t)
 			require.NoError(t, os.WriteFile(envPath, []byte(test.content), 0o600))
 			env := map[string]string{}
-			require.NoError(t, parseEnvFile(hostEnv, envPath, &env, false)(t.Context()))
+			require.NoError(t, parseEnvFile(e, envPath, &env, false)(t.Context()))
 			assert.Equal(t, test.want, env)
 		})
 	}
 	t.Run("ordered entries preserve repeated names", func(t *testing.T) {
-		envPath := filepath.Join(hostEnv.Path, "ordered")
+		hostEnv, envPath := newTestHostEnv(t)
 		require.NoError(t, os.WriteFile(envPath, []byte("FOO=first\r\nfoo<<EOF\r\nmiddle\r\nEOF\r\nFOO=last\r\n"), 0o600))
 		var entries [][2]string
 		require.NoError(t, ParseEnvFile(hostEnv, envPath, func(name, value string) {
@@ -66,7 +70,7 @@ func TestParseEnvFile(t *testing.T) {
 		}, entries)
 	})
 	t.Run("Windows line endings", func(t *testing.T) {
-		envPath := filepath.Join(hostEnv.Path, "windows")
+		hostEnv, envPath := newTestHostEnv(t)
 		require.NoError(t, os.WriteFile(envPath, []byte("FOO=bar\r\nMULTI<<EOF\r\nline1\r\nline2\nEOF\r\n"), 0o600))
 		env := map[string]string{}
 		require.NoError(t, parseEnvFile(hostEnv, envPath, &env, true)(t.Context()))
@@ -76,22 +80,16 @@ func TestParseEnvFile(t *testing.T) {
 
 func TestParseEnvFileLineExceedsBufferReportsScannerError(t *testing.T) {
 	t.Parallel()
-	hostEnv := &HostEnvironment{Path: t.TempDir()}
+	e, envPath := newTestHostEnv(t)
-	envPath := filepath.Join(hostEnv.Path, "envfile")
+	require.NoError(t, os.WriteFile(envPath, []byte("FOO<<EOF\n"+strings.Repeat("x", 17*1024*1024)+"\nEOF\n"), 0o600))
-	const header, footer = "FOO<<EOF\n", "\nEOF\n"
-	content := bytes.Repeat([]byte("x"), len(header)+17*1024*1024+len(footer))
-	copy(content, header)
-	copy(content[len(content)-len(footer):], footer)
-	require.NoError(t, os.WriteFile(envPath, content, 0o600))
 
 	env := map[string]string{}
-	err := parseEnvFile(hostEnv, envPath, &env, false)(t.Context())
+	err := parseEnvFile(e, envPath, &env, false)(t.Context())
 	require.ErrorIs(t, err, bufio.ErrTooLong)
 	assert.Contains(t, err.Error(), "reading env file")
 }
 
 func TestParseEnvFileInvalidHeredoc(t *testing.T) {
-	hostEnv := &HostEnvironment{Path: t.TempDir()}
 	for name, content := range map[string]string{
 		"missing delimiter":              "FOO<<EOF\nline1\nline2\n",
 		"empty name":                     "<<EOF\nline1\nEOF\n",
@@ -99,11 +97,11 @@ func TestParseEnvFileInvalidHeredoc(t *testing.T) {
 		"delimiter with carriage return": "FOO<<EOF\nline1\nEOF\r\n",
 	} {
 		t.Run(name, func(t *testing.T) {
-			envPath := filepath.Join(hostEnv.Path, name)
+			e, envPath := newTestHostEnv(t)
 			require.NoError(t, os.WriteFile(envPath, []byte("APPLIED=before-error\n"+content), 0o600))
 
 			env := map[string]string{}
-			err := parseEnvFile(hostEnv, envPath, &env, false)(t.Context())
+			err := parseEnvFile(e, envPath, &env, false)(t.Context())
 			require.Error(t, err)
 			assert.Contains(t, err.Error(), "delimiter")
 			assert.Equal(t, map[string]string{"APPLIED": "before-error"}, env)

act/filecollector/file_collector_test.go

@@ -28,12 +28,10 @@ func gitCmd(t *testing.T, args ...string) {
 }
 
 func TestCollectFilesKeepsWhatGitTracksOrDoesNotIgnore(t *testing.T) {
-	repoDir := t.TempDir()
+	repoDir := filepath.Join(t.TempDir(), "mygitrepo")
-	gitCmd(t, "init", "-q", "--template=", repoDir)
+	for _, dir := range []string{repoDir, filepath.Join(repoDir, "sub"), filepath.Join(repoDir, "nested")} {
-	for _, dir := range []string{"sub", "nested"} {
+		gitCmd(t, "init", "-q", dir)
-		require.NoError(t, os.CopyFS(filepath.Join(repoDir, dir, ".git"), os.DirFS(filepath.Join(repoDir, ".git"))))
 	}
-	require.NoError(t, os.Mkdir(filepath.Join(repoDir, "ign"), 0o755))
 	for name, body := range map[string]string{
 		".gitignore":     ".*\nign/\n",
 		".env":           "",
@@ -45,15 +43,15 @@ func TestCollectFilesKeepsWhatGitTracksOrDoesNotIgnore(t *testing.T) {
 		"sub/kept":       "",
 		"nested/kept":    "",
 	} {
+		require.NoError(t, os.MkdirAll(filepath.Dir(filepath.Join(repoDir, name)), 0o755))
 		require.NoError(t, os.WriteFile(filepath.Join(repoDir, name), []byte(body), 0o644))
 	}
 	require.NoError(t, os.Mkdir(filepath.Join(repoDir, "uninitialized"), 0o755))
 	gitCmd(t, "-C", repoDir, "add", "-f", ".gitignore", "Renamed", "ign/tracked")
 	require.NoError(t, os.Rename(filepath.Join(repoDir, "Renamed"), filepath.Join(repoDir, "renamed")))
-	gitCmd(t, "-C", repoDir, "update-index", "--add",
+	for _, gitlink := range []string{"sub", "uninitialized"} {
-		"--cacheinfo", "160000,4b825dc642cb6eb9a060e54bf8d69288fbee4904,sub",
+		gitCmd(t, "-C", repoDir, "update-index", "--add", "--cacheinfo", "160000,4b825dc642cb6eb9a060e54bf8d69288fbee4904,"+gitlink)
-		"--cacheinfo", "160000,4b825dc642cb6eb9a060e54bf8d69288fbee4904,uninitialized",
+	}
-	)
 	expected := map[string]string{".gitignore": "", "ign/tracked": "", "nested/kept": "", "renamed": "", "sub/.gitignore": "", "sub/kept": ""}
 	if runtime.GOOS != "windows" {
 		require.NoError(t, os.Chmod(filepath.Join(repoDir, "renamed"), 0o777|os.ModeSticky))

act/runner/action_composite_test.go

@@ -92,7 +92,7 @@ func TestCompositeActionParity(t *testing.T) {
 			return "", "", assert.AnError
 		})
 		rc := &RunContext{
-			Config:       &Config{GitHubInstance: "github.com", PresetGitHubContext: &model.GithubContext{}},
+			Config:       &Config{GitHubInstance: "github.com", ActionCacheDir: t.TempDir(), PresetGitHubContext: &model.GithubContext{}},
 			Run:          &model.Run{JobID: "job", Workflow: &model.Workflow{Jobs: map[string]*model.Job{"job": {}}}},
 			JobContainer: &jobContainerMock{},
 		}

act/runner/action_test.go

@@ -249,7 +249,6 @@ func TestActionRunner(t *testing.T) {
 }
 
 func TestGoActionUsesLinuxExecutablePaths(t *testing.T) {
-	actionRoot := t.TempDir()
 	for _, stage := range []string{"main", "pre", "post"} {
 		t.Run(stage, func(t *testing.T) {
 			cm := &containerMock{}
@@ -265,7 +264,7 @@ func TestGoActionUsesLinuxExecutablePaths(t *testing.T) {
 					JobContainer: cm,
 				},
 				action:       &model.Action{Runs: model.ActionRuns{Using: model.ActionRunsUsingGo, Main: "main.go", Pre: "pre.go", Post: "post.go"}},
-				actionDir:    filepath.Join(actionRoot, stage),
+				actionDir:    t.TempDir(),
 				env:          map[string]string{},
 				remoteAction: mustNewRemoteAction(t, "org/repo@ref"),
 			}
@@ -505,21 +504,11 @@ func TestExecAsDockerHoldsCloneLockForRemoteUncached(t *testing.T) {
 }
 
 func TestExecAsDockerImageChecks(t *testing.T) {
-	actionRoot := t.TempDir()
 	originalExists, originalBuild, originalContainer := ContainerImageExistsLocally, ContainerNewDockerBuildExecutor, ContainerNewContainer
 	t.Cleanup(func() {
 		ContainerImageExistsLocally, ContainerNewDockerBuildExecutor, ContainerNewContainer = originalExists, originalBuild, originalContainer
 	})
 	ContainerNewContainer = func(*container.NewContainerInput) container.ExecutionsEnvironment { return fakeContainer{} }
-	var removed bool
-	fakeDockerDaemon(t, func(writer http.ResponseWriter, request *http.Request) {
-		if request.Method == http.MethodDelete {
-			removed = true
-			_, _ = io.WriteString(writer, `[]`)
-		} else {
-			_, _ = io.WriteString(writer, `{"Architecture":"aarch64"}`)
-		}
-	})
 
 	for _, testcase := range []struct {
 		name, platform           string
@@ -540,11 +529,18 @@ func TestExecAsDockerImageChecks(t *testing.T) {
 				checks = append(checks, platform)
 				return testcase.exists && (platform == "any" || testcase.matches), nil
 			}
-			var built bool
+			var built, removed bool
-			removed = false
 			ContainerNewDockerBuildExecutor = func(container.NewDockerBuildExecutorInput) common.Executor {
 				return func(context.Context) error { built = true; return nil }
 			}
+			fakeDockerDaemon(t, func(writer http.ResponseWriter, request *http.Request) {
+				if request.Method == http.MethodDelete {
+					removed = true
+					_, _ = io.WriteString(writer, `[]`)
+				} else {
+					_, _ = io.WriteString(writer, `{"Architecture":"aarch64"}`)
+				}
+			})
 			step := &stepActionRemote{
 				Step: &model.Step{ID: "action"},
 				RunContext: &RunContext{
@@ -559,7 +555,7 @@ func TestExecAsDockerImageChecks(t *testing.T) {
 				action: &model.Action{Runs: model.ActionRuns{Using: "docker", Image: "Dockerfile"}},
 				env:    map[string]string{},
 			}
-			dir := filepath.Join(actionRoot, testcase.name)
+			dir := t.TempDir()
 			require.NoError(t, execAsDocker(t.Context(), step, "action", dir, dir, false, stepStageMain))
 			assert.Equal(t, testcase.wantChecks, checks)
 			assert.Equal(t, testcase.wantBuild, built)
@@ -731,9 +727,9 @@ func TestExecAsDockerStageEntrypoint(t *testing.T) {
 			cm.On("Close").Return(func(context.Context) error { return nil })
 
 			if tc.stage == stepStageMain {
-				require.NoError(t, runActionImpl(step, "", step.remoteAction)(ctx))
+				require.NoError(t, runActionImpl(step, t.TempDir(), step.remoteAction)(ctx))
 			} else {
-				require.NoError(t, execAsDocker(ctx, step, "action", "", "", false, tc.stage))
+				require.NoError(t, execAsDocker(ctx, step, "action", t.TempDir(), t.TempDir(), false, tc.stage))
 			}
 			if tc.warning == "" {
 				assert.Empty(t, hook.AllRecords())

act/runner/command_test.go

@@ -193,6 +193,11 @@ func TestCommandLogWriter(t *testing.T) {
 		log   []string
 		masks []string
 	}{
+		{
+			name:  "mask commands decode modern and legacy escapes once",
+			steps: [][]string{{"::add-mask::%25", "##[add-mask]alpha beta%3Bgamma%5Ddelta%250A"}},
+			masks: []string{"%", "alpha beta;gamma]delta%0A"},
+		},
 		{
 			name: "applied commands are hidden unless echoed",
 			steps: [][]string{{

act/runner/expression_test.go

@@ -412,10 +412,11 @@ func TestGetEvaluatorInputsBoolean(t *testing.T) {
 	}
 
 	for _, eventName := range []string{"workflow_call", "workflow_dispatch"} {
-		wf, err := model.ReadWorkflow(strings.NewReader(workflow(eventName)))
-		require.NoError(t, err)
 		for _, table := range tables {
 			t.Run(eventName+"/"+table.name, func(t *testing.T) {
+				wf, err := model.ReadWorkflow(strings.NewReader(workflow(eventName)))
+				require.NoError(t, err)
+
 				rc := &RunContext{
 					Config: &Config{Workdir: "."},
 					Run:    &model.Run{JobID: "job1", Workflow: wf},

act/runner/job_executor_test.go

@@ -993,7 +993,6 @@ func tarArchive(t *testing.T, entries ...tarEntry) []byte {
 	buf := &bytes.Buffer{}
 	tw := tar.NewWriter(buf)
 	for _, entry := range entries {
-		buf.Grow(len(entry.body) + 3*512)
 		typeflag := entry.typeflag
 		if typeflag == 0 {
 			typeflag = tar.TypeReg
@@ -1010,7 +1009,7 @@ func tarArchive(t *testing.T, entries ...tarEntry) []byte {
 		}
 		require.NoError(t, tw.WriteHeader(header))
 		if typeflag == tar.TypeReg {
-			_, err := io.CopyN(tw, strings.NewReader(entry.body), int64(len(entry.body)))
+			_, err := tw.Write([]byte(entry.body))
 			require.NoError(t, err)
 		}
 	}
@@ -1150,12 +1149,12 @@ func TestTryUploadJobSummaryMasksSecrets(t *testing.T) {
 			}))
 			defer server.Close()
 
-			content, err := testcase.encoding.NewEncoder().String(testcase.content)
+			content, err := testcase.encoding.NewEncoder().Bytes([]byte(testcase.content))
 			require.NoError(t, err)
 			cm := &containerMock{}
 			cm.On("GetContainerArchive", mock.Anything, "/var/run/act/workflow/step-summary-0.md").Return(
 				io.NopCloser(bytes.NewReader(tarArchive(t, tarEntry{
-					name: "step-summary-0.md", body: content,
+					name: "step-summary-0.md", body: string(content),
 				}))),
 				nil,
 			).Once()

act/runner/logger.go

@@ -263,29 +263,27 @@ func AppendSecretMaskers(oldnew []string, secrets map[string]string) []string {
 	return oldnew
 }
 
-// AppendSecretMasker registers v and each of its lines, as GitHub does.
+// AppendSecretMasker skips one-byte line fragments to avoid masking punctuation from structured secrets.
 func AppendSecretMasker(oldnew []string, v string) []string {
 	ret := appendMaskedValue(oldnew, v)
 	for l := range strings.FieldsFuncSeq(v, func(r rune) bool { return r == '\r' || r == '\n' }) {
-		ret = appendMaskedValue(ret, strings.TrimSpace(l))
+		if line := strings.TrimSpace(l); len(line) > 1 {
+			ret = appendMaskedValue(ret, line)
+		}
 	}
 	return ret
 }
 
-// appendMaskedValue registers one value and every shape it takes on its way into a log.
 func appendMaskedValue(ret []string, v string) []string {
-	// formatted JSON secrets could otherwise mask {,[,],} everywhere
+	if strings.TrimSpace(v) == "" || slices.Contains(ret, v) {
-	if len(strings.TrimSpace(v)) <= 1 || slices.Contains(ret, v) {
 		return ret
 	}
 	ret = append(ret, v, "***")
-	// command data reaches the log escaped, so "pass%word" also arrives as "pass%25word"
 	if strings.ContainsAny(v, "%\r\n") {
 		ret = append(ret, EscapeCommandData(v), "***")
 	}
 	for _, encode := range secretValueEncoders {
 		encoded := encode(v)
-		// An encoding that leaves the value unchanged is already masked above.
 		if encoded == v || len(encoded) <= 1 || slices.Contains(ret, encoded) {
 			continue
 		}
@@ -319,7 +317,7 @@ func valueMasker(insecureSecrets bool, oldnew []string) entryProcessor {
 		masks := Masks(ctx)
 
 		if len(*masks) == 0 {
-			r.Message = defReplacer.Replace(r.Message)
+			r.Message = MaskLog(r.Message, defReplacer)
 			return r
 		}
 
@@ -339,12 +337,42 @@ func valueMasker(insecureSecrets bool, oldnew []string) entryProcessor {
 		cmasker := replacer
 		mu.Unlock()
 
-		r.Message = cmasker.Replace(r.Message)
+		r.Message = MaskLog(r.Message, cmasker)
 
 		return r
 	}
 }
 
+// MaskLog decodes command data before masking to cover partially escaped values.
+func MaskLog(message string, replacer *strings.Replacer) string {
+	var command, data string
+	var found bool
+	unescape := UnescapeCommandData
+	if strings.HasPrefix(message, "##[") {
+		command, data, found = strings.Cut(message[3:], "]")
+		unescape = UnescapeLegacyCommand
+	} else if strings.HasPrefix(message, "::") {
+		command, data, found = strings.Cut(message[2:], "::")
+		if name, _, properties := strings.Cut(command, " "); properties {
+			switch name {
+			case "error", "warning", "notice", "debug":
+				command = name
+			}
+		}
+	}
+	switch command {
+	case "error", "warning", "notice", "debug", "group", "endgroup", "add-matcher":
+		if found {
+			trimmedData := strings.TrimRight(data, "\r\n")
+			normalized := message[:len(message)-len(data)] + EscapeCommandData(unescape(trimmedData)) + data[len(trimmedData):]
+			if masked := replacer.Replace(normalized); masked != normalized {
+				return masked
+			}
+		}
+	}
+	return replacer.Replace(message)
+}
+
 type maskedHandler struct {
 	logging.Handler
 	masker entryProcessor

act/runner/logger_test.go

@@ -28,6 +28,7 @@ func TestValueMasker(t *testing.T) {
 		secrets    map[string]string
 		masks      []string
 		disallowed []string
+		want       string
 	}{
 		{
 			name:  "Multiline Private Key",
@@ -49,6 +50,60 @@ func TestValueMasker(t *testing.T) {
 			secrets:    map[string]string{"TOKEN": "pass%word"},
 			disallowed: []string{"pass%25word"},
 		},
+		{
+			name:  "one-character mask",
+			lines: "%",
+			masks: []string{"%"},
+			want:  "***",
+		},
+		{
+			name:    "fully escaped legacy secret",
+			lines:   "##[group]alpha beta%3Bgamma%5Ddelta",
+			secrets: map[string]string{"TOKEN": "alpha beta;gamma]delta"},
+			want:    "##[group]***",
+		},
+		{
+			name:  "partially escaped legacy mask",
+			lines: "##[group]alpha beta%3Bgamma]delta",
+			masks: []string{"alpha beta;gamma]delta"},
+			want:  "##[group]***",
+		},
+		{
+			name:  "partially escaped modern mask preserves unrelated escapes",
+			lines: "::group::alpha%25beta%gamma tail%250A%0A",
+			masks: []string{"alpha%beta%gamma"},
+			want:  "::group::*** tail%250A%0A",
+		},
+		{
+			name:  "command escapes are decoded once",
+			lines: "##[group]alpha%253Bbeta%5Dgamma",
+			masks: []string{"alpha;beta]gamma"},
+			want:  "##[group]alpha%253Bbeta%5Dgamma",
+		},
+		{
+			name:  "plain output preserves escapes",
+			lines: "alpha beta%3Bgamma%5Ddelta",
+			masks: []string{"alpha beta;gamma]delta"},
+			want:  "alpha beta%3Bgamma%5Ddelta",
+		},
+		{
+			name:  "command display preserves literal escapes around a mask",
+			lines: "##[command]alpha tail%3Bvalue%5D",
+			masks: []string{"alpha"},
+			want:  "##[command]*** tail%3Bvalue%5D",
+		},
+		{
+			name:  "unknown modern commands preserve literal escapes",
+			lines: "::unknown::alpha tail%25value",
+			masks: []string{"alpha"},
+			want:  "::unknown::*** tail%25value",
+		},
+		{
+			name:  "masks can span command headers and data",
+			lines: "::group::hidden other",
+			masks: []string{"group::hidden", "other"},
+			want:  "::*** ***",
+		},
 	}
 	for _, entry := range table {
 		t.Run(entry.name, func(t *testing.T) {
@@ -56,6 +111,9 @@ func TestValueMasker(t *testing.T) {
 			masker := valueMasker(false, AppendSecretMaskers(nil, entry.secrets))
 			for line := range strings.SplitSeq(entry.lines, "\n") {
 				lentry := masker(ctx, logging.Record{Message: line})
+				if entry.want != "" {
+					assert.Equal(t, entry.want, lentry.Message)
+				}
 				for _, line := range entry.disallowed {
 					assert.NotContains(t, lentry.Message, line)
 				}
@@ -139,6 +197,7 @@ func TestValueMaskerEncodedMasks(t *testing.T) {
 		{"encoded: " + base64.StdEncoding.EncodeToString([]byte(" s3cr3t ")), "encoded: ***"},
 		{"encoded: " + base64.StdEncoding.EncodeToString([]byte("s3cr3t")), "encoded: ***"},
 		{"encoded: " + base64.StdEncoding.EncodeToString([]byte("first")), "encoded: ***"},
+		{"##[group]s3cr3t value\r\n", "##[group]***\r\n"},
 	} {
 		entry := masker(WithMasks(t.Context(), &masks), logging.Record{Message: tc.line})
 		assert.Equal(t, tc.want, entry.Message, tc.line)
@@ -194,17 +253,15 @@ func TestValueMaskerCachedReplacerSeesNewMasks(t *testing.T) {
 }
 
 func TestAppendSecretMaskerSkipsUselessEncodings(t *testing.T) {
-	// A token with no character an escape would touch only gains its base64 forms:
-	// JSON, query and path escaping all leave it unchanged.
 	pairs := AppendSecretMasker(nil, "plaintoken")
 	assert.Equal(t, []string{
 		"plaintoken", "***", "cGxhaW50b2tlbg==", "***", "bGFpbnRva2Vu", "***", "YWludG9rZW4=", "***",
 		"aW50b2tl", "***", "YWludG9r", "***", "bGFpbnRv", "***",
 	}, pairs)
 
-	// Too short to mask.
+	assert.Contains(t, AppendSecretMasker(nil, "x"), "x")
-	assert.Empty(t, AppendSecretMasker(nil, "x"))
 	assert.Empty(t, AppendSecretMasker(nil, " \t"))
+	assert.NotContains(t, AppendSecretMasker(nil, "{\nvalue\n}"), "{")
 	assert.NotContains(t, AppendSecretMasker(nil, `"123456"`), "123456")
 }
 

act/runner/patch_actions_e2e_test.go

@@ -4,7 +4,6 @@
 package runner
 
 import (
-	"bytes"
 	"context"
 	"encoding/base64"
 	"io"
@@ -210,14 +209,14 @@ func TestPatchedBundleAcrossActions(t *testing.T) {
 				assert.Equal(t, data, out, "an untouched bundle must come back byte for byte")
 				return
 			}
-			assert.False(t, bytes.Contains(out, []byte(".LOCALHOST")), "a copy of the gate was missed")
+			assert.NotContains(t, string(out), ".LOCALHOST", "a copy of the gate was missed")
 
-			if !bytes.Contains(data, []byte(CacheServiceV2Env)) {
+			if !strings.Contains(string(data), CacheServiceV2Env) {
 				return
 			}
-			assert.NotZero(t, bytes.Count(out, []byte("(process.env."+cacheURLEnv+"||process.env")),
+			assert.NotZero(t, strings.Count(string(out), "(process.env."+cacheURLEnv+"||process.env"),
 				"the cache service URL was not redirected")
-			assert.Equal(t, bytes.Count(data, []byte(resultsURLEnv)), bytes.Count(out, []byte(resultsURLEnv)),
+			assert.Equal(t, strings.Count(string(data), resultsURLEnv), strings.Count(string(out), resultsURLEnv),
 				"a read of the results URL was lost, it must stay as the fallback")
 		})
 	}
@@ -312,18 +311,18 @@ func TestCodeSplitActionFindsTheCacheService(t *testing.T) {
 	requireHostTools(t, "node", "rustc")
 
 	dir := tempDirPath(t)
-	require.NoError(t, os.Mkdir(filepath.Join(dir, "dist"), 0o755))
 	for _, name := range []string{
 		"action.yml", "dist/restore.js", "dist/save.js", "dist/cleanup-BWEbZ6YT.js",
 		"dist/cache-CTfQoCTL.js", "dist/cache-DC26rUaF.js", "dist/state-cjs-CkvFUaNy.js",
 	} {
 		body, err := os.ReadFile(bundleFromGitHub(t, "Swatinem/rust-cache", "v2.9.2", name))
 		require.NoError(t, err)
+		require.NoError(t, os.MkdirAll(filepath.Dir(filepath.Join(dir, name)), 0o755))
 		require.NoError(t, os.WriteFile(filepath.Join(dir, name), body, 0o600))
 	}
 	body, err := os.ReadFile(filepath.Join(dir, "action.yml"))
 	require.NoError(t, err)
-	action, err := model.ReadAction(bytes.NewReader(body))
+	action, err := model.ReadAction(strings.NewReader(string(body)))
 	require.NoError(t, err)
 	inputs := map[string]string{"lookup-only": "true", "add-rust-environment-hash-key": "false", "cache-bin": "false"}
 	for name, input := range action.Inputs {

act/runner/patch_actions_test.go

@@ -4,7 +4,6 @@
 package runner
 
 import (
-	"bytes"
 	"context"
 	"os"
 	"os/exec"
@@ -183,9 +182,9 @@ func TestPatchedBundleSurvivesInsideAStringLiteral(t *testing.T) {
 	out, patched := patchedBundle([]byte(embedded))
 	require.True(t, patched)
 
-	cmd := exec.CommandContext(t.Context(), "node", "--check", "-")
+	file := filepath.Join(t.TempDir(), "bundle.js")
-	cmd.Stdin = bytes.NewReader(out)
+	require.NoError(t, os.WriteFile(file, out, 0o600))
-	checked, err := cmd.CombinedOutput()
+	checked, err := exec.CommandContext(t.Context(), "node", "--check", file).CombinedOutput()
 	require.NoError(t, err, "%s", checked)
 }
 
@@ -257,14 +256,6 @@ func TestActionScriptPaths(t *testing.T) {
 }
 
 func TestPatchActionsAtTheContainerCopy(t *testing.T) {
-	actionDir := t.TempDir()
-	script := filepath.Join(actionDir, "dist", "cache.js")
-	require.NoError(t, os.MkdirAll(filepath.Dir(script), 0o755))
-	require.NoError(t, os.WriteFile(filepath.Join(filepath.Dir(script), "index.js"), []byte("require('./cache.js')"), 0o600))
-	require.NoError(t, os.WriteFile(script, []byte(gateTSC), 0o600))
-	info, err := os.Stat(script)
-	require.NoError(t, err)
-
 	copiedBundles := func(t *testing.T, noPatch bool) ([]string, []*container.FileEntry, int64) {
 		t.Helper()
 
@@ -273,12 +264,19 @@ func TestPatchActionsAtTheContainerCopy(t *testing.T) {
 			Step:         &model.Step{Uses: "owner/repo/sub@v1"},
 			remoteAction: &remoteAction{Org: "owner", Repo: "repo", Path: "sub", Ref: "v1"},
 			action:       &model.Action{Runs: model.ActionRuns{Using: "node20", Main: "../dist/index.js"}},
-			actionDir:    actionDir,
+			actionDir:    t.TempDir(),
 			RunContext: &RunContext{
-				Config:       &Config{NoActionPatch: noPatch},
+				Config:       &Config{ActionCacheDir: t.TempDir(), NoActionPatch: noPatch},
 				JobContainer: cm,
 			},
 		}
+		script := filepath.Join(sar.actionDir, "dist", "cache.js")
+		require.NoError(t, os.MkdirAll(filepath.Dir(script), 0o755))
+		require.NoError(t, os.WriteFile(filepath.Join(filepath.Dir(script), "index.js"), []byte("require('./cache.js')"), 0o600))
+		require.NoError(t, os.WriteFile(script, []byte(gateTSC), 0o600))
+		info, err := os.Stat(script)
+		require.NoError(t, err)
+
 		var calls []string
 		var copied []*container.FileEntry
 		cm.On("CopyDir", "/var/run/act/actions/repo/", sar.actionDir+"/", false, true).Return(func(context.Context) error {

act/runner/reusable_workflow_test.go

@@ -33,17 +33,24 @@ func TestReusableWorkflowCachedBranchRefRefreshes(t *testing.T) {
 	}
 
 	remoteDir := t.TempDir()
-	gitMust(t, "", "init", "--template=", "--initial-branch=master", remoteDir)
+	gitMust(t, "", "init", "--bare", "--initial-branch=master", remoteDir)
+
+	workDir := t.TempDir()
+	gitMust(t, "", "clone", remoteDir, workDir)
+	gitMust(t, workDir, "config", "user.email", "test@test")
+	gitMust(t, workDir, "config", "user.name", "test")
+	gitMust(t, workDir, "checkout", "-b", "master")
 
 	const workflowPath = ".gitea/workflows/reusable.yml"
 	tmpl := func(tag string) string {
 		return "name: reusable\non:\n  workflow_call:\njobs:\n  build:\n    runs-on: ubuntu-latest\n    steps:\n      - run: echo " + tag + "\n"
 	}
 
-	require.NoError(t, os.MkdirAll(filepath.Join(remoteDir, ".gitea/workflows"), 0o755))
+	require.NoError(t, os.MkdirAll(filepath.Join(workDir, ".gitea/workflows"), 0o755))
-	require.NoError(t, os.WriteFile(filepath.Join(remoteDir, workflowPath), []byte(tmpl("v1")), 0o644))
+	require.NoError(t, os.WriteFile(filepath.Join(workDir, workflowPath), []byte(tmpl("v1")), 0o644))
-	gitMust(t, remoteDir, "add", workflowPath)
+	gitMust(t, workDir, "add", workflowPath)
-	gitMust(t, remoteDir, "commit", "-m", "v1")
+	gitMust(t, workDir, "commit", "-m", "v1")
+	gitMust(t, workDir, "push", "-u", "origin", "master")
 
 	rc := &RunContext{
 		Config: &Config{Env: testCheckoutEnv()},
@@ -63,8 +70,9 @@ func TestReusableWorkflowCachedBranchRefRefreshes(t *testing.T) {
 	require.Equal(t, tmpl("v1"), string(got))
 
 	// Branch tip moves; cache key (cacheDir) does not.
-	require.NoError(t, os.WriteFile(filepath.Join(remoteDir, workflowPath), []byte(tmpl("v2")), 0o644))
+	require.NoError(t, os.WriteFile(filepath.Join(workDir, workflowPath), []byte(tmpl("v2")), 0o644))
-	gitMust(t, remoteDir, "commit", "-am", "v2")
+	gitMust(t, workDir, "commit", "-am", "v2")
+	gitMust(t, workDir, "push", "origin", "master")
 
 	require.NoError(t, cloneRemoteReusableWorkflow(rc, remoteDir, "master", cacheDir)(t.Context()))
 	got, err = os.ReadFile(filepath.Join(cacheDir, workflowPath))
@@ -206,7 +214,7 @@ func TestInstanceAuthAndTransportOnlyApplyToTheInstance(t *testing.T) {
 
 func gitMust(t *testing.T, dir string, args ...string) {
 	t.Helper()
-	cmd := exec.Command("git", append([]string{"-c", "user.name=test", "-c", "user.email=test@test"}, args...)...)
+	cmd := exec.Command("git", args...)
 	if dir != "" {
 		cmd.Dir = dir
 	}

act/runner/run_context_test.go

@@ -1666,21 +1666,21 @@ func TestRunContextUpdateExtraPath(t *testing.T) {
 	longPath := strings.Repeat("x", 64*1024+1)
 	for _, testcase := range []struct {
 		name    string
-		content string
+		content []byte
 		want    string
 		wantErr bool
 	}{
-		{name: "UTF-8 BOM", content: "\xef\xbb\xbf/utf8/tools\n", want: "/utf8/tools"},
+		{name: "UTF-8 BOM", content: []byte("\xef\xbb\xbf/utf8/tools\n"), want: "/utf8/tools"},
-		{name: "UTF-16 BOM", content: "\xff\xfeC\x00:\x00\\\x00t\x00o\x00o\x00l\x00s\x00\n\x00", want: `C:\tools`},
+		{name: "UTF-16 BOM", content: []byte{0xff, 0xfe, 'C', 0, ':', 0, '\\', 0, 't', 0, 'o', 0, 'o', 0, 'l', 0, 's', 0, '\n', 0}, want: `C:\tools`},
-		{name: "over 64 KiB", content: longPath + "\n", want: longPath},
+		{name: "over 64 KiB", content: []byte(longPath + "\n"), want: longPath},
-		{name: "over 16 MiB", content: strings.Repeat("x", 16*1024*1024+1), wantErr: true},
+		{name: "over 16 MiB", content: []byte(strings.Repeat("x", 16*1024*1024+1)), wantErr: true},
 	} {
 		t.Run(testcase.name, func(t *testing.T) {
 			logger := logging.New(logging.DiscardHandler)
 			ctx := common.WithLogger(t.Context(), logger)
 			jobContainer := &containerMock{}
 			jobContainer.On("GetContainerArchive", mock.Anything, "/github/path").
-				Return(io.NopCloser(bytes.NewReader(tarArchive(t, tarEntry{name: "path", body: testcase.content}))), nil).Once()
+				Return(io.NopCloser(bytes.NewReader(tarArchive(t, tarEntry{name: "path", body: string(testcase.content)}))), nil).Once()
 			defer jobContainer.AssertExpectations(t)
 			rc := &RunContext{JobContainer: jobContainer}
 

act/runner/step_action_remote_test.go

@@ -35,8 +35,14 @@ func setFetch(t *testing.T, fetch func(context.Context, git.NewGitCloneExecutorI
 func TestShortSHAActionRejected(t *testing.T) {
 	actionRoot := t.TempDir()
 	repo := filepath.Join(actionRoot, "actions", "hello-world-docker-action")
-	gitMust(t, "", "init", "--template=", "--initial-branch=main", repo)
+	require.NoError(t, os.MkdirAll(repo, 0o755))
-	gitMust(t, repo, "commit", "--allow-empty", "-m", "initial")
+	gitMust(t, "", "init", "--initial-branch=main", repo)
+	gitMust(t, repo, "config", "user.email", "test@test")
+	gitMust(t, repo, "config", "user.name", "test")
+	require.NoError(t, os.WriteFile(filepath.Join(repo, "action.yml"),
+		[]byte("name: hello\nruns:\n  using: node24\n  main: index.js\n"), 0o644))
+	gitMust(t, repo, "add", ".")
+	gitMust(t, repo, "commit", "-m", "initial")
 	output, err := exec.Command("git", "-C", repo, "rev-parse", "--short=7", "HEAD").Output()
 	require.NoError(t, err)
 
@@ -387,7 +393,7 @@ func TestStepActionRemotePreResolvesDownloadedCommit(t *testing.T) {
 		[]byte("name: setup-go\nruns:\n  using: node20\n  main: index.js\n"), 0o600))
 
 	for _, args := range [][]string{
-		{"init", "--template=", "--initial-branch=main", actionDir},
+		{"init", "--initial-branch=main", actionDir},
 		{"-C", actionDir, "add", "action.yml"},
 		{"-C", actionDir, "-c", "user.name=runner", "-c", "[email protected]", "-c", "commit.gpgsign=false", "commit", "-m", "action"},
 	} {

internal/app/cmd/daemon_test.go

@@ -128,11 +128,6 @@ func (*daemonTestService) UpdateLog(_ context.Context, req *runnerv1.UpdateLogRe
 func TestDaemonRetriesDeclareOutagesAndRemovesOnlyConsumedEphemeralRegistration(t *testing.T) {
 	defer func(delay time.Duration) { declareRetryDelay = delay }(declareRetryDelay)
 	declareRetryDelay = 0
-	dir := t.TempDir()
-	regFile := filepath.Join(dir, "registration.json")
-	configFile := filepath.Join(dir, "config.yaml")
-	require.NoError(t, os.WriteFile(configFile, []byte("runner:\n  file: "+regFile+"\n  idle_cleanup_interval: 0s\ncache:\n  enabled: false\n"), 0o600))
-
 	for _, tc := range []struct {
 		name                  string
 		ephemeral, beforeTask bool
@@ -159,6 +154,10 @@ func TestDaemonRetriesDeclareOutagesAndRemovesOnlyConsumedEphemeralRegistration(
 			connecthttp.Mount(mux, rpcServer, connecthttp.WithReadMaxBytes(0))
 			server := httptest.NewServer(http.StripPrefix("/api/actions", mux))
 			defer server.Close()
+			dir := t.TempDir()
+			regFile := filepath.Join(dir, "registration.json")
+			configFile := filepath.Join(dir, "config.yaml")
+			require.NoError(t, os.WriteFile(configFile, []byte("runner:\n  file: "+regFile+"\n  idle_cleanup_interval: 0s\ncache:\n  enabled: false\n"), 0o600))
 			require.NoError(t, config.SaveRegistration(regFile, &config.Registration{Address: server.URL, UUID: "test", Name: "test", Token: "test", Labels: []string{"host:host"}, Ephemeral: tc.ephemeral}))
 			err := runDaemon(ctx, &daemonArgs{Once: true}, &configFile)(nil, nil)
 			if tc.declareErr == nil && tc.fetchErr == nil || tc.beforeTask {

internal/app/cmd/exec_test.go

@@ -75,35 +75,40 @@ func TestExecuteArgsLoadInputs(t *testing.T) {
 }
 
 func TestExecuteArgsEventJSON(t *testing.T) {
-	dir := t.TempDir()
+	payload := func(content string) string {
+		path := filepath.Join(t.TempDir(), "event.json")
+		require.NoError(t, os.WriteFile(path, []byte(content), 0o600))
+		return path
+	}
+
 	tests := []struct {
-		name     string
+		name      string
-		payload  string
+		eventpath string
-		inputs   []string
+		inputs    []string
-		expected string
+		expected  string
 	}{
 		{
-			name:     "keeps a payload without inputs to merge",
+			name:      "keeps a payload without inputs to merge",
-			payload:  `{"inputs": {"kept": "from_event"}}`,
+			eventpath: payload(`{"inputs": {"kept": "from_event"}}`),
-			expected: `{"inputs": {"kept": "from_event"}}`,
+			expected:  `{"inputs": {"kept": "from_event"}}`,
 		},
 		{
-			name:     "overrides the event inputs it names, keeping the rest",
+			name:      "overrides the event inputs it names, keeping the rest",
-			payload:  `{"inputs": {"kept": "from_event", "named": "from_event"}}`,
+			eventpath: payload(`{"inputs": {"kept": "from_event", "named": "from_event"}}`),
-			inputs:   []string{"named=from_cli"},
+			inputs:    []string{"named=from_cli"},
-			expected: `{"inputs": {"kept": "from_event", "named": "from_cli"}}`,
+			expected:  `{"inputs": {"kept": "from_event", "named": "from_cli"}}`,
 		},
 		{
-			name:     "adds inputs to a payload carrying none",
+			name:      "adds inputs to a payload carrying none",
-			payload:  `{"repository": {"name": "test-repo"}}`,
+			eventpath: payload(`{"repository": {"name": "test-repo"}}`),
-			inputs:   []string{"flag=val"},
+			inputs:    []string{"flag=val"},
-			expected: `{"repository": {"name": "test-repo"}, "inputs": {"flag": "val"}}`,
+			expected:  `{"repository": {"name": "test-repo"}, "inputs": {"flag": "val"}}`,
 		},
 		{
-			name:     "handles a null payload",
+			name:      "handles a null payload",
-			payload:  "null",
+			eventpath: payload("null"),
-			inputs:   []string{"flag=val"},
+			inputs:    []string{"flag=val"},
-			expected: `{"inputs": {"flag": "val"}}`,
+			expected:  `{"inputs": {"flag": "val"}}`,
 		},
 		{
 			name:     "builds a payload without an event file",
@@ -114,12 +119,7 @@ func TestExecuteArgsEventJSON(t *testing.T) {
 
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			var eventpath string
+			eventJSON, err := (&executeArgs{eventpath: tt.eventpath, inputs: tt.inputs}).eventJSON()
-			if tt.payload != "" {
-				eventpath = filepath.Join(dir, tt.name+".json")
-				require.NoError(t, os.WriteFile(eventpath, []byte(tt.payload), 0o600))
-			}
-			eventJSON, err := (&executeArgs{eventpath: eventpath, inputs: tt.inputs}).eventJSON()
 			require.NoError(t, err)
 			require.JSONEq(t, tt.expected, eventJSON)
 		})
@@ -275,13 +275,21 @@ func workflowForList(name, file, event, jobID, jobName string) *model.Workflow {
 	return &model.Workflow{
 		Name:  name,
 		File:  file,
-		RawOn: yaml.Node{Kind: yaml.ScalarNode, Tag: "!!str", Value: event},
+		RawOn: rawOnNode(event),
 		Jobs: map[string]*model.Job{
 			jobID: {Name: jobName},
 		},
 	}
 }
 
+func rawOnNode(event string) yaml.Node {
+	var node yaml.Node
+	if err := yaml.Unmarshal([]byte(event), &node); err != nil {
+		panic(err)
+	}
+	return *node.Content[0]
+}
+
 func TestExecuteArgsLoadEnvsResultsOrigin(t *testing.T) {
 	t.Setenv("ACTIONS_RESULTS_URL", "") // the default is only supplied when nothing else does
 	handler, err := artifactcache.StartHandler(artifactcache.Options{Dir: t.TempDir(), OutboundIP: "127.0.0.1"})

internal/app/run/post_task_script_test.go

@@ -27,9 +27,16 @@ func TestRunPostTaskScriptSkippedWhenEmpty(t *testing.T) {
 	r := &Runner{
 		cfg: &config.Config{},
 	}
+	ctx, cancel := context.WithCancel(t.Context())
+	defer cancel()
+
+	taskCtx, err := structpb.NewStruct(map[string]any{})
+	require.NoError(t, err)
+	task := &runnerv1.Task{Id: 1, Context: taskCtx}
+	reporter := report.NewReporter(ctx, cancel, nil, task, r.cfg)
 
 	require.NotPanics(t, func() {
-		r.runPostTaskScript(t.Context(), nil, nil, "/workspace/owner/repo")
+		r.runPostTaskScript(ctx, reporter, task, "/workspace/owner/repo")
 	})
 }
 
@@ -52,7 +59,9 @@ func TestRunPostTaskScriptNonZeroExitDoesNotPanic(t *testing.T) {
 	ctx, cancel := context.WithCancel(t.Context())
 	defer cancel()
 
-	task := &runnerv1.Task{Id: 1, Context: &structpb.Struct{}}
+	taskCtx, err := structpb.NewStruct(map[string]any{})
+	require.NoError(t, err)
+	task := &runnerv1.Task{Id: 1, Context: taskCtx}
 	reporter := report.NewReporter(ctx, cancel, nil, task, cfg)
 
 	require.NotPanics(t, func() {
@@ -137,7 +146,9 @@ func TestRunPostTaskScriptIntegration(t *testing.T) {
 	ctx, cancel := context.WithCancel(t.Context())
 	defer cancel()
 
-	task := &runnerv1.Task{Id: 11, Context: &structpb.Struct{}}
+	taskCtx, err := structpb.NewStruct(map[string]any{})
+	require.NoError(t, err)
+	task := &runnerv1.Task{Id: 11, Context: taskCtx}
 	reporter := report.NewReporter(ctx, cancel, nil, task, cfg)
 	setReporterJobResult(t, reporter, runnerv1.Result_RESULT_SUCCESS)
 

internal/app/run/runner_idle_cleanup_test.go

@@ -21,7 +21,8 @@ import (
 
 func TestRunnerCleanupStaleTaskDirs(t *testing.T) {
 	now := time.Date(2026, time.April, 29, 20, 0, 0, 0, time.UTC)
-	workdirRoot := t.TempDir()
+	workdirRoot := filepath.Join(t.TempDir(), "workspace")
+	require.NoError(t, os.MkdirAll(workdirRoot, 0o700))
 
 	oldTask := filepath.Join(workdirRoot, "1001")
 	freshTask := filepath.Join(workdirRoot, "1002")
@@ -58,7 +59,8 @@ func TestRunnerCleanupStaleTaskDirs(t *testing.T) {
 // be reclaimed, while the shared tool_cache and operator data are preserved.
 func TestRunnerOnIdleCleansStaleHostScratchDirs(t *testing.T) {
 	now := time.Date(2026, time.April, 29, 20, 0, 0, 0, time.UTC)
-	hostRoot := t.TempDir()
+	hostRoot := filepath.Join(t.TempDir(), "act")
+	require.NoError(t, os.MkdirAll(hostRoot, 0o700))
 
 	staleScratch := filepath.Join(hostRoot, "0123456789abcdef") // 16 hex
 	freshScratch := filepath.Join(hostRoot, "fedcba9876543210")
@@ -116,7 +118,8 @@ func TestRunnerCleanupStaleTaskDirsMissingRoot(t *testing.T) {
 
 func TestRunnerCleanupStaleTaskDirsHonorsContext(t *testing.T) {
 	now := time.Date(2026, time.April, 29, 20, 0, 0, 0, time.UTC)
-	workdirRoot := t.TempDir()
+	workdirRoot := filepath.Join(t.TempDir(), "workspace")
+	require.NoError(t, os.MkdirAll(workdirRoot, 0o700))
 
 	for i := 1001; i <= 1003; i++ {
 		dir := filepath.Join(workdirRoot, strconv.Itoa(i))

internal/app/run/setup_test.go

@@ -96,7 +96,6 @@ func TestSetupLinesInputs(t *testing.T) {
 }
 
 func TestPrettyOSName(t *testing.T) {
-	dir := t.TempDir()
 	for _, tt := range []struct {
 		name      string
 		osRelease string
@@ -110,7 +109,7 @@ func TestPrettyOSName(t *testing.T) {
 		{"missing file", "", "", true},
 	} {
 		t.Run(tt.name, func(t *testing.T) {
-			path := filepath.Join(dir, tt.name)
+			path := filepath.Join(t.TempDir(), "os-release")
 			if !tt.missing {
 				require.NoError(t, os.WriteFile(path, []byte(tt.osRelease), 0o600))
 			}

internal/pkg/action/checkout/checkout_test.go

@@ -59,7 +59,7 @@ func TestCheckout(t *testing.T) {
 		t.Run("history", func(t *testing.T) {
 			t.Parallel()
 			work := t.TempDir()
-			runGit(t, "init", "--template=", "--initial-branch=main", work)
+			runGit(t, "init", "--initial-branch=main", work)
 			runGit(t, "-C", work, "commit", "--allow-empty", "-m", "c1")
 			sha = runGit(t, "-C", work, "rev-parse", "HEAD")
 			runGit(t, "-C", work, "tag", "v1")
@@ -77,7 +77,7 @@ func TestCheckout(t *testing.T) {
 		t.Run("sha256", func(t *testing.T) {
 			t.Parallel()
 			sha256Repo := filepath.Join(server, "org", "sha256")
-			runGit(t, "init", "--template=", "--object-format=sha256", "--initial-branch=main", sha256Repo)
+			runGit(t, "init", "--object-format=sha256", "--initial-branch=main", sha256Repo)
 			runGit(t, "-C", sha256Repo, "commit", "--allow-empty", "-m", "s1")
 			runGit(t, "-C", sha256Repo, "checkout", "--detach")
 		})
@@ -267,41 +267,21 @@ exec "$LFS" "$@"
 				assert.Contains(t, string(outputs), "ref="+cmp.Or(tc.eventRef, "refs/heads/main")+"\n")
 				return
 			}
-			headArgs := []string{"-C", dst, "rev-parse", "HEAD", "--symbolic-full-name", "HEAD"}
-			if tc.head != "" {
-				headArgs = append(headArgs, "--abbrev-ref", "@{u}")
-			}
-			head := strings.Fields(runGit(t, headArgs...))
 			if tc.head == "" {
-				require.Len(t, head, 2)
+				assert.Empty(t, gitOutput(dst, "symbolic-ref", "-q", "HEAD"))
-				assert.Equal(t, "HEAD", head[1])
 			} else {
-				require.Len(t, head, 3)
+				assert.Equal(t, "refs/heads/"+tc.head, gitOutput(dst, "symbolic-ref", "-q", "HEAD"))
-				assert.Equal(t, "refs/heads/"+tc.head, head[1])
+				assert.Equal(t, "origin/"+tc.head, gitOutput(dst, "rev-parse", "--abbrev-ref", "@{u}"))
-				assert.Equal(t, "origin/"+tc.head, head[2])
 			}
-			assert.Contains(t, string(outputs), "commit="+head[0]+"\n")
+			assert.Contains(t, string(outputs), "commit="+gitOutput(dst, "rev-parse", "HEAD")+"\n")
 			if inputRef := tc.inputs["ref"]; inputRef != "" && inputRef != sha {
 				assert.Contains(t, string(outputs), "ref="+inputRef+"\n")
 			}
+			assert.Equal(t, tc.inputs["sparse-checkout"] != "", gitOutput(dst, "config", "--local", "extensions.worktreeConfig") == "true")
 			persisted := tc.inputs["persist-credentials"] != "false"
 			for _, repo := range repos {
-				var credentialIncludes []string
-				var worktreeConfig string
-				for entry := range strings.SplitSeq(runGit(t, "-C", repo, "config", "--local", "--no-includes", "--null", "--list"), "\x00") {
-					key, value, _ := strings.Cut(entry, "\n")
-					switch key {
-					case "extensions.worktreeconfig":
-						worktreeConfig = value
-					case strings.ToLower(credentialsInclude):
-						credentialIncludes = append(credentialIncludes, value)
-					}
-				}
-				if repo == dst {
-					assert.Equal(t, tc.inputs["sparse-checkout"] != "", strings.TrimSpace(worktreeConfig) == "true")
-				}
 				assert.Equal(t, tc.inputs["clean"] == "false", fileExists(filepath.Join(repo, "untracked")), repo)
-				assert.Len(t, strings.Fields(strings.Join(credentialIncludes, "\n")), 1, repo)
+				assert.Len(t, strings.Fields(gitOutput(repo, "config", "--local", "--get-all", credentialsInclude)), 1, repo)
 				headers, _ := exec.Command("git", "-C", repo, "config", "--get-all", "http."+serverURL+"/.extraheader").Output()
 				assert.Equal(t, persisted, string(headers) == "\nAuthorization: Basic dG9rZW46dG9r\n", repo)
 				assert.Equal(t, persisted, gitOutput(repo, "config", "http."+serverURL+"/.sslcainfo") != "", repo)
@@ -365,16 +345,15 @@ func TestCheckoutTrustsTheRunnerCAAndOffersClientCertOnlyDuringTheStep(t *testin
 
 func publish(t *testing.T, server, name string, files, submodules map[string]string) {
 	work := t.TempDir()
-	runGit(t, "init", "--template=", "--initial-branch=main", work)
+	runGit(t, "init", "--initial-branch=main", work)
 	for file, content := range files {
 		require.NoError(t, os.MkdirAll(filepath.Dir(filepath.Join(work, file)), 0o755))
 		require.NoError(t, os.WriteFile(filepath.Join(work, file), []byte(content), 0o644))
 	}
 	runGit(t, "-C", work, "add", ".")
-	var moduleConfig []byte
 	for path, url := range submodules {
-		moduleConfig = fmt.Appendf(moduleConfig, "[submodule %q]\n\tpath = %q\n\turl = %q\n", path, path, url)
+		runGit(t, "-C", work, "config", "-f", ".gitmodules", "submodule."+path+".path", path)
-		require.NoError(t, os.WriteFile(filepath.Join(work, ".gitmodules"), moduleConfig, 0o644))
+		runGit(t, "-C", work, "config", "-f", ".gitmodules", "submodule."+path+".url", url)
 		commit := runGit(t, "--git-dir", filepath.Join(server, name, url), "rev-parse", "main")
 		runGit(t, "-C", work, "update-index", "--add", "--cacheinfo", "160000,"+commit+","+path)
 		runGit(t, "-C", work, "add", ".gitmodules")

internal/pkg/process/group_windows_test.go

@@ -6,6 +6,7 @@ package process
 import (
 	"os/exec"
 	"testing"
+	"time"
 
 	"github.com/stretchr/testify/require"
 )
@@ -22,13 +23,16 @@ func TestGroupClosePropagatesToOrphan(t *testing.T) {
 	childPID := ready()
 
 	require.NoError(t, cmd.Wait())
-	require.True(t, cmd.ProcessState.Exited(), "the step process should have exited on its own")
+	require.Eventually(t, func() bool {
+		return !processAlive(cmd.Process.Pid)
+	}, 20*time.Second, 200*time.Millisecond, "the step process should have exited on its own")
 
 	require.True(t, processAlive(childPID), "orphan should outlive its parent")
 
-	waitForExit := newProcessExitWaiter(t, childPID)
 	require.NoError(t, group.Close())
-	waitForExit()
+	require.Eventually(t, func() bool {
+		return !processAlive(childPID)
+	}, 20*time.Second, 200*time.Millisecond, "closing the job must terminate the orphan")
 }
 
 // TestGroupNestsWithKiller: assigned to the group first and the step's Killer
@@ -49,9 +53,10 @@ func TestGroupNestsWithKiller(t *testing.T) {
 	require.NoError(t, err, "the step's job object must nest inside the group's")
 	defer killer.Close()
 
-	waitForExit := newProcessExitWaiter(t, cmd.Process.Pid)
 	require.NoError(t, killer.Kill())
-	waitForExit()
+	require.Eventually(t, func() bool {
+		return !processAlive(cmd.Process.Pid)
+	}, 20*time.Second, 200*time.Millisecond, "cancelling the step should still kill its tree")
 }
 
 // TestGroupNilSafe covers the fallback path: when the job object cannot be

internal/pkg/process/killer_unix_test.go

@@ -9,6 +9,8 @@ import (
 	"fmt"
 	"os"
 	"os/exec"
+	"path/filepath"
+	"strconv"
 	"strings"
 	"syscall"
 	"testing"
@@ -44,8 +46,23 @@ func processAlive(pid int) bool {
 	return true
 }
 
+// TestKillerKillsTree verifies that a process group captured by the killer is
+// terminated together with a child the process spawns afterwards. This mirrors
+// a step or post-task script that launches a child which spawns further
+// processes, where cancelling must take down the whole tree, not just the
+// direct child.
 func TestKillerKillsTree(t *testing.T) {
-	cmd, ready := newTestProcess(t, "parent", false)
+	dir := t.TempDir()
+	pidFile := filepath.Join(dir, "child.pid")
+
+	// Parent shell backgrounds a long-lived child (writing its PID to a file)
+	// and then sleeps. With job control off (non-interactive sh) the backgrounded
+	// child stays in the parent's process group, so the group kill must reach it.
+	script := fmt.Sprintf(`sleep 600 & echo $! > %q; sleep 600`, pidFile)
+	cmd := exec.Command("/bin/sh", "-c", script)
+	// Launch as its own process-group leader, exactly like a real process does
+	// (see SysProcAttr), so the killer's PGID == the process PID.
+	cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
 	require.NoError(t, cmd.Start())
 	t.Cleanup(func() {
 		_ = syscall.Kill(-cmd.Process.Pid, syscall.SIGKILL)
@@ -56,10 +73,25 @@ func TestKillerKillsTree(t *testing.T) {
 	require.NoError(t, err)
 	defer killer.Close()
 
-	childPID := ready()
+	// Wait for the backgrounded child PID to be reported.
-	require.True(t, processAlive(childPID), "child process should start")
+	var childPID int
+	require.Eventually(t, func() bool {
+		b, e := os.ReadFile(pidFile)
+		if e != nil {
+			return false
+		}
+		s := strings.TrimSpace(string(b))
+		if s == "" {
+			return false
+		}
+		childPID, _ = strconv.Atoi(s)
+		return childPID > 0 && processAlive(childPID)
+	}, 20*time.Second, 100*time.Millisecond, "child process should start")
 
+	// Killing the group must terminate both the parent and the backgrounded child.
 	require.NoError(t, killer.Kill())
+	// Reap the parent so it does not linger as a zombie (which would still report
+	// as alive); SIGKILL makes Wait return promptly.
 	_ = cmd.Wait()
 
 	require.Eventually(t, func() bool {

internal/pkg/process/killer_windows_test.go

@@ -5,6 +5,7 @@ package process
 
 import (
 	"testing"
+	"time"
 
 	"github.com/stretchr/testify/require"
 	"golang.org/x/sys/windows"
@@ -24,23 +25,6 @@ func processAlive(pid int) bool {
 	return code == stillActive
 }
 
-func newProcessExitWaiter(t *testing.T, pids ...int) func() {
-	t.Helper()
-	handles := make([]windows.Handle, 0, len(pids))
-	for _, pid := range pids {
-		handle, err := windows.OpenProcess(windows.SYNCHRONIZE, false, uint32(pid))
-		require.NoError(t, err)
-		t.Cleanup(func() { require.NoError(t, windows.CloseHandle(handle)) })
-		handles = append(handles, handle)
-	}
-	return func() {
-		t.Helper()
-		result, err := windows.WaitForMultipleObjects(handles, true, 20000)
-		require.NoError(t, err)
-		require.EqualValues(t, windows.WAIT_OBJECT_0, result, "processes should exit: %v", pids)
-	}
-}
-
 func TestKillerKillsTree(t *testing.T) {
 	cmd, ready := newTestProcess(t, "parent", false)
 	require.NoError(t, cmd.Start())
@@ -55,7 +39,9 @@ func TestKillerKillsTree(t *testing.T) {
 	childPID := ready()
 	require.True(t, processAlive(childPID), "child process should start")
 
-	waitForExit := newProcessExitWaiter(t, cmd.Process.Pid, childPID)
 	require.NoError(t, killer.Kill())
-	waitForExit()
+
+	require.Eventually(t, func() bool {
+		return !processAlive(cmd.Process.Pid) && !processAlive(childPID)
+	}, 20*time.Second, 200*time.Millisecond, "parent and child should both be terminated")
 }

internal/pkg/report/reporter.go

@@ -960,7 +960,7 @@ func logRow(entry logging.Record) *runnerv1.LogRow {
 
 // mask repairs the content first, so a secret the repair itself spells out is still caught.
 func (r *Reporter) mask(content string) string {
-	return r.logReplacer.Replace(strings.ToValidUTF8(content, "?"))
+	return runner.MaskLog(strings.ToValidUTF8(content, "?"), r.logReplacer)
 }
 
 // AddMask deliberately leaves the process-wide masker alone. Its entries come from every live

internal/pkg/report/reporter_test.go

@@ -173,9 +173,11 @@ func TestReporter_RunDaemonClose_Race(t *testing.T) {
 	)
 
 	ctx, cancel := context.WithCancel(t.Context())
+	taskCtx, err := structpb.NewStruct(map[string]any{})
+	require.NoError(t, err)
 	cfg, _ := config.LoadDefault("")
 	reporter := NewReporter(ctx, cancel, client, &runnerv1.Task{
-		Context: &structpb.Struct{},
+		Context: taskCtx,
 	}, cfg)
 	reporter.ResetSteps(newTestSteps(1))
 
@@ -472,8 +474,10 @@ func TestReporter_ServerCancelStillFlushesFinal(t *testing.T) {
 
 	ctx, cancel := context.WithCancel(t.Context())
 	defer cancel()
+	taskCtx, err := structpb.NewStruct(map[string]any{})
+	require.NoError(t, err)
 	cfg, _ := config.LoadDefault("")
-	reporter := NewReporter(ctx, cancel, client, &runnerv1.Task{Context: &structpb.Struct{}}, cfg)
+	reporter := NewReporter(ctx, cancel, client, &runnerv1.Task{Context: taskCtx}, cfg)
 	reporter.ResetSteps(newTestSteps(1))
 
 	reporter.stateMu.Lock()
@@ -523,8 +527,10 @@ func TestReporter_CloseReportsCancelledOnCanceledCtx(t *testing.T) {
 	)
 
 	ctx, cancel := context.WithCancel(t.Context())
+	taskCtx, err := structpb.NewStruct(map[string]any{})
+	require.NoError(t, err)
 	cfg, _ := config.LoadDefault("")
-	reporter := NewReporter(ctx, cancel, client, &runnerv1.Task{Context: &structpb.Struct{}}, cfg)
+	reporter := NewReporter(ctx, cancel, client, &runnerv1.Task{Context: taskCtx}, cfg)
 	reporter.ResetSteps(newTestSteps(1))
 
 	cancel()
@@ -665,15 +671,19 @@ func TestReporter_SetOutputs(t *testing.T) {
 	require.True(t, ok)
 	assert.Equal(t, "caf\xff", got.value)
 
-	r.SetOutputs(map[string]string{"atlimit": longValue[:maxOutputValueLen]})
+	maxValue := strings.Repeat("v", maxOutputValueLen)
+	r.SetOutputs(map[string]string{"atlimit": maxValue})
 	got, ok = r.outputs["atlimit"]
 	require.True(t, ok)
 	assert.Len(t, got.value, maxOutputValueLen)
 }
 
 func TestReporter_DebugSettingsAreNotMasked(t *testing.T) {
+	taskCtx, err := structpb.NewStruct(map[string]any{})
+	require.NoError(t, err)
+
 	reporter := NewReporter(t.Context(), nil, nil, &runnerv1.Task{
-		Context: &structpb.Struct{},
+		Context: taskCtx,
 		Secrets: map[string]string{"ACTIONS_STEP_DEBUG": "true", "ACTIONS_RUNNER_DEBUG": "true", "TOKEN": "s3cr3t"},
 	}, &config.Config{})
 	defer deregisterGlobalMasks(reporter)
@@ -750,8 +760,7 @@ func TestReporter_ParseResult(t *testing.T) {
 func TestReporter_masksEncodedSecrets(t *testing.T) {
 	secret := `p@ss w"rd/1`
 	r := &Reporter{logReplacer: strings.NewReplacer()}
-	r.oldnew = runner.AppendSecretMasker(r.oldnew, secret)
+	r.AddMask(secret)
-	r.logReplacer = strings.NewReplacer(r.oldnew...)
 
 	for _, line := range []string{
 		"token: " + secret,
@@ -763,6 +772,17 @@ func TestReporter_masksEncodedSecrets(t *testing.T) {
 		assert.NotContains(t, masked, secret)
 		assert.NotContains(t, masked, base64.StdEncoding.EncodeToString([]byte(secret)))
 	}
+
+	r.AddMask("alpha beta;gamma]delta")
+	r.AddMask("%")
+	for _, test := range []struct{ line, want string }{
+		{"##[group]alpha beta%3Bgamma%5Ddelta", "##[group]***"},
+		{"##[group]alpha beta%3Bgamma]delta", "##[group]***"},
+		{"%", "***"},
+	} {
+		r.appendLogRow(logRow(logging.Record{Message: test.line}))
+		assert.Equal(t, test.want, r.logRows[len(r.logRows)-1].Content)
+	}
 }
 
 func TestReporter_AckIndexBeyondBuffer(t *testing.T) {
@@ -851,8 +871,10 @@ func TestReporter_ServerFailureResultIsReportedAsFailure(t *testing.T) {
 
 	ctx, cancel := context.WithCancel(t.Context())
 	defer cancel()
+	taskCtx, err := structpb.NewStruct(map[string]any{})
+	require.NoError(t, err)
 	cfg, _ := config.LoadDefault("")
-	reporter := NewReporter(ctx, cancel, client, &runnerv1.Task{Context: &structpb.Struct{}}, cfg)
+	reporter := NewReporter(ctx, cancel, client, &runnerv1.Task{Context: taskCtx}, cfg)
 	close(reporter.daemon)
 
 	require.NoError(t, reporter.ReportState(false))
@@ -1019,7 +1041,9 @@ func newTestReporter(t *testing.T, client *mocks.Client, cfg *config.Config) *Re
 	t.Helper()
 	ctx, cancel := context.WithCancel(t.Context())
 	t.Cleanup(cancel)
-	return NewReporter(ctx, cancel, client, &runnerv1.Task{Context: &structpb.Struct{}}, cfg)
+	taskCtx, err := structpb.NewStruct(map[string]any{})
+	require.NoError(t, err)
+	return NewReporter(ctx, cancel, client, &runnerv1.Task{Context: taskCtx}, cfg)
 }
 
 func newTestSteps(n int) []*model.Step {
@@ -1037,9 +1061,11 @@ func TestReporter_ReportedSteps(t *testing.T) {
 			return &runnerv1.UpdateLogResponse{AckIndex: req.Index + int64(len(req.Rows))}, nil
 		})
 		client.On("UpdateTask", mock.Anything, mock.Anything).Maybe().Return(&runnerv1.UpdateTaskResponse{}, nil)
+		taskCtx, err := structpb.NewStruct(map[string]any{})
+		require.NoError(t, err)
 		cfg, _ := config.LoadDefault("")
 		ctx, cancel := context.WithCancel(t.Context())
-		reporter := NewReporter(ctx, cancel, client, &runnerv1.Task{Context: &structpb.Struct{}, Secrets: map[string]string{"TOKEN": "s3cr3t"}}, cfg)
+		reporter := NewReporter(ctx, cancel, client, &runnerv1.Task{Context: taskCtx, Secrets: map[string]string{"TOKEN": "s3cr3t"}}, cfg)
 		reporter.RunDaemon()
 		reporter.Logf("runner version")
 		reporter.ResetSteps(steps)

internal/pkg/telemetry/telemetry_test.go

@@ -117,8 +117,7 @@ func TestExportRetriesAndMatchesOTLP(t *testing.T) {
 	certificate := server.TLS.Certificates[0]
 	key, err := x509.MarshalPKCS8PrivateKey(certificate.PrivateKey)
 	require.NoError(t, err)
-	dir := t.TempDir()
+	certificatePath, keyPath := filepath.Join(t.TempDir(), "cert.pem"), filepath.Join(t.TempDir(), "key.pem")
-	certificatePath, keyPath := filepath.Join(dir, "cert.pem"), filepath.Join(dir, "key.pem")
 	require.NoError(t, os.WriteFile(certificatePath, pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: certificate.Certificate[0]}), 0o600))
 	require.NoError(t, os.WriteFile(keyPath, pem.EncodeToMemory(&pem.Block{Type: "PRIVATE KEY", Bytes: key}), 0o600))
 	setEnv(t, map[string]string{