diff --git a/fixtures.go b/fixtures.go
index e18ba38..a06526b 100644
--- a/fixtures.go
+++ b/fixtures.go
@@ -204,16 +204,25 @@ func GetRemotes(t *testing.T, repoPath string) map[string]string {
 		if line == "" {
 			continue
 		}
-		name, rest, ok := strings.Cut(line, "\t")
+		name, remainder, ok := strings.Cut(line, "\t")
 		if !ok {
-			continue
+			// Fallback for unusual formatting that does not use tabs.
+			idx := strings.IndexAny(line, " \t")
+			if idx == -1 {
+				continue
+			}
+			name = strings.TrimSpace(line[:idx])
+			remainder = strings.TrimSpace(line[idx+1:])
+		} else {
+			name = strings.TrimSpace(name)
+			remainder = strings.TrimSpace(remainder)
 		}
-		name = strings.TrimSpace(name)
-		rest = strings.TrimSpace(rest)
-		rest = strings.TrimSuffix(rest, " (fetch)")
-		rest = strings.TrimSuffix(rest, " (push)")
-		if name != "" && rest != "" {
-			remotes[name] = rest
+
+		remainder = strings.TrimSuffix(remainder, " (fetch)")
+		remainder = strings.TrimSuffix(remainder, " (push)")
+
+		if name != "" && remainder != "" {
+			remotes[name] = remainder
 		}
 	}
 
diff --git a/fixtures_test.go b/fixtures_test.go
index 641605d..77f5af1 100644
--- a/fixtures_test.go
+++ b/fixtures_test.go
@@ -79,6 +79,26 @@ func TestCreateTestRepo_WithRemotes(t *testing.T) {
 	}
 }
 
+func TestCreateTestRepo_WithRemotePathContainingSpaces(t *testing.T) {
+	remotePath := testutil.CreateBareRemote(t, "origin with space")
+
+	repoPath := testutil.CreateTestRepo(t, testutil.RepoOptions{
+		Name: "remote-space-repo",
+		Remotes: map[string]string{
+			"origin": remotePath,
+		},
+	})
+
+	remotes := testutil.GetRemotes(t, repoPath)
+	originURL, exists := remotes["origin"]
+	if !exists {
+		t.Fatal("Expected 'origin' remote to be configured")
+	}
+	if originURL != remotePath {
+		t.Fatalf("Expected origin URL %q, got %q", remotePath, originURL)
+	}
+}
+
 func TestCreateBareRemote(t *testing.T) {
 	remotePath := testutil.CreateBareRemote(t, "test-remote")
 
diff --git a/usb_fixtures.go b/usb_fixtures.go
new file mode 100644
index 0000000..c43324a
--- /dev/null
+++ b/usb_fixtures.go
@@ -0,0 +1,183 @@
+package testutil
+
+import (
+	"fmt"
+	"net/url"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"testing"
+	"time"
+)
+
+// validateFixtureLayoutDir reports whether layoutDir may be joined under a fixture root.
+// Empty layoutDir is allowed (caller may default it).
+func validateFixtureLayoutDir(layoutDir string) error {
+	if layoutDir == "" {
+		return nil
+	}
+	clean := filepath.Clean(layoutDir)
+	if filepath.IsAbs(clean) {
+		return fmt.Errorf("must be relative to fixture root: %q", layoutDir)
+	}
+	if clean == ".." || strings.HasPrefix(clean, ".."+string(filepath.Separator)) {
+		return fmt.Errorf("must be relative to fixture root: %q", layoutDir)
+	}
+	return nil
+}
+
+type USBVolumeOptions struct {
+	LayoutDir string
+	Strategy  string
+	CreateReposDir bool
+}
+
+type USBVolumeConfig struct {
+	SchemaVersion int
+	LayoutDir     string
+	Strategy      string
+	CreatedAt     time.Time
+}
+
+func mustRelativeLayoutDir(t *testing.T, layoutDir string) string {
+	t.Helper()
+	if layoutDir == "" {
+		return "repos"
+	}
+	if err := validateFixtureLayoutDir(layoutDir); err != nil {
+		t.Fatalf("layout_dir %v", err)
+	}
+	return filepath.Clean(layoutDir)
+}
+
+func MustUSBVolumeRoot(t *testing.T, opts USBVolumeOptions) string {
+	t.Helper()
+	root := t.TempDir()
+	cfg := USBVolumeConfig{
+		SchemaVersion: 1,
+		LayoutDir:     mustRelativeLayoutDir(t, opts.LayoutDir),
+		Strategy:      opts.Strategy,
+		CreatedAt:     time.Now().UTC(),
+	}
+	if cfg.Strategy == "" {
+		cfg.Strategy = "git-mirror"
+	}
+	WriteUSBVolumeConfig(t, root, cfg)
+	if opts.CreateReposDir {
+		if err := os.MkdirAll(filepath.Join(root, cfg.LayoutDir), 0o755); err != nil {
+			t.Fatalf("failed creating repos dir: %v", err)
+		}
+	}
+	return root
+}
+
+func WriteUSBVolumeConfig(t *testing.T, root string, cfg USBVolumeConfig) {
+	t.Helper()
+	if cfg.SchemaVersion <= 0 {
+		cfg.SchemaVersion = 1
+	}
+	cfg.LayoutDir = mustRelativeLayoutDir(t, cfg.LayoutDir)
+	if cfg.Strategy == "" {
+		cfg.Strategy = "git-mirror"
+	}
+	if cfg.CreatedAt.IsZero() {
+		cfg.CreatedAt = time.Now().UTC()
+	}
+	content := fmt.Sprintf(
+		"schema_version = %d\nlayout_dir = %q\nstrategy = %q\ncreated_at = %q\n",
+		cfg.SchemaVersion,
+		cfg.LayoutDir,
+		cfg.Strategy,
+		cfg.CreatedAt.Format(time.RFC3339),
+	)
+	if err := os.WriteFile(filepath.Join(root, ".git-fire"), []byte(content), 0o644); err != nil {
+		t.Fatalf("failed writing .git-fire: %v", err)
+	}
+}
+
+func readUSBVolumeConfigBytes(data []byte) (USBVolumeConfig, error) {
+	cfg := USBVolumeConfig{}
+	lines := strings.Split(string(data), "\n")
+	for _, line := range lines {
+		line = strings.TrimSpace(line)
+		if line == "" || strings.HasPrefix(line, "#") {
+			continue
+		}
+		key, val, ok := strings.Cut(line, "=")
+		if !ok {
+			continue
+		}
+		key = strings.TrimSpace(key)
+		val = strings.Trim(strings.TrimSpace(val), "\"")
+		switch key {
+		case "schema_version":
+			n, err := strconv.Atoi(val)
+			if err != nil {
+				return cfg, fmt.Errorf("invalid schema_version %q: %w", val, err)
+			}
+			cfg.SchemaVersion = n
+		case "layout_dir":
+			if err := validateFixtureLayoutDir(val); err != nil {
+				return cfg, fmt.Errorf("layout_dir: %w", err)
+			}
+			if val == "" {
+				cfg.LayoutDir = ""
+			} else {
+				cfg.LayoutDir = filepath.Clean(val)
+			}
+		case "strategy":
+			cfg.Strategy = val
+		case "created_at":
+			if val == "" {
+				return cfg, fmt.Errorf("created_at: empty value")
+			}
+			ts, err := time.Parse(time.RFC3339, val)
+			if err != nil {
+				return cfg, fmt.Errorf("invalid created_at %q: %w", val, err)
+			}
+			cfg.CreatedAt = ts
+		}
+	}
+	return cfg, nil
+}
+
+func ReadUSBVolumeConfig(t *testing.T, root string) USBVolumeConfig {
+	t.Helper()
+	data, err := os.ReadFile(filepath.Join(root, ".git-fire"))
+	if err != nil {
+		t.Fatalf("failed reading .git-fire: %v", err)
+	}
+	cfg, err := readUSBVolumeConfigBytes(data)
+	if err != nil {
+		t.Fatalf("parse .git-fire: %v", err)
+	}
+	return cfg
+}
+
+func AssertGitDirAt(t *testing.T, path string, wantBare bool) {
+	t.Helper()
+	if wantBare {
+		if _, err := os.Stat(filepath.Join(path, "HEAD")); err != nil {
+			t.Fatalf("expected bare repo at %s: %v", path, err)
+		}
+		return
+	}
+	if _, err := os.Stat(filepath.Join(path, ".git")); err != nil {
+		t.Fatalf("expected non-bare repo at %s: %v", path, err)
+	}
+}
+
+func FileURLForPath(t *testing.T, path string) string {
+	t.Helper()
+	abs, err := filepath.Abs(path)
+	if err != nil {
+		t.Fatalf("failed to make abs path: %v", err)
+	}
+	uPath := filepath.ToSlash(abs)
+	if filepath.VolumeName(abs) != "" && !strings.HasPrefix(uPath, "/") {
+		uPath = "/" + uPath
+	}
+	u := &url.URL{Scheme: "file", Path: uPath}
+	return u.String()
+}
diff --git a/usb_fixtures_test.go b/usb_fixtures_test.go
new file mode 100644
index 0000000..458c934
--- /dev/null
+++ b/usb_fixtures_test.go
@@ -0,0 +1,147 @@
+package testutil
+
+import (
+	"net/url"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+func TestMustUSBVolumeRoot(t *testing.T) {
+	root := MustUSBVolumeRoot(t, USBVolumeOptions{
+		LayoutDir:       "repos",
+		Strategy:        "git-mirror",
+		CreateReposDir:  true,
+	})
+	if _, err := os.Stat(filepath.Join(root, ".git-fire")); err != nil {
+		t.Fatalf("expected .git-fire marker: %v", err)
+	}
+	if _, err := os.Stat(filepath.Join(root, "repos")); err != nil {
+		t.Fatalf("expected repos dir: %v", err)
+	}
+}
+
+func TestReadWriteUSBVolumeConfig(t *testing.T) {
+	root := t.TempDir()
+	WriteUSBVolumeConfig(t, root, USBVolumeConfig{
+		SchemaVersion: 2,
+		LayoutDir:     "custom",
+		Strategy:      "git-clone",
+	})
+	cfg := ReadUSBVolumeConfig(t, root)
+	if cfg.SchemaVersion != 2 {
+		t.Fatalf("schema mismatch: %d", cfg.SchemaVersion)
+	}
+	if cfg.LayoutDir != "custom" {
+		t.Fatalf("layout mismatch: %s", cfg.LayoutDir)
+	}
+	if cfg.Strategy != "git-clone" {
+		t.Fatalf("strategy mismatch: %s", cfg.Strategy)
+	}
+}
+
+func TestValidateFixtureLayoutDir(t *testing.T) {
+	t.Parallel()
+	root := t.TempDir()
+	absUnderRoot := filepath.Join(root, "abs-layout")
+	if err := os.MkdirAll(absUnderRoot, 0o755); err != nil {
+		t.Fatal(err)
+	}
+	bad := []string{
+		"..",
+		"../escape",
+		"nested/../../../escape",
+		absUnderRoot,
+	}
+	for _, dir := range bad {
+		if err := validateFixtureLayoutDir(dir); err == nil {
+			t.Errorf("validateFixtureLayoutDir(%q): want error, got nil", dir)
+		}
+	}
+	good := []string{"", "repos", "nested", "nested/../repos"}
+	for _, dir := range good {
+		if err := validateFixtureLayoutDir(dir); err != nil {
+			t.Errorf("validateFixtureLayoutDir(%q): %v", dir, err)
+		}
+	}
+}
+
+func TestReadUSBVolumeConfigBytes_roundTrip(t *testing.T) {
+	t.Parallel()
+	input := "schema_version = 2\nlayout_dir = \"custom\"\nstrategy = \"git-clone\"\ncreated_at = \"2020-01-02T15:04:05Z\"\n"
+	cfg, err := readUSBVolumeConfigBytes([]byte(input))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if cfg.SchemaVersion != 2 {
+		t.Fatalf("schema: got %d", cfg.SchemaVersion)
+	}
+	if cfg.LayoutDir != "custom" {
+		t.Fatalf("layout: got %q", cfg.LayoutDir)
+	}
+	if cfg.Strategy != "git-clone" {
+		t.Fatalf("strategy: got %q", cfg.Strategy)
+	}
+	if cfg.CreatedAt.IsZero() {
+		t.Fatal("created_at: zero")
+	}
+}
+
+func TestReadUSBVolumeConfigBytes_errors(t *testing.T) {
+	t.Parallel()
+	cases := []struct {
+		name, content, wantSubstring string
+	}{
+		{
+			name:           "invalid_schema_version",
+			content:        "schema_version = notint\n",
+			wantSubstring:  "schema_version",
+		},
+		{
+			name:           "layout_dir_escape",
+			content:        "layout_dir = ../x\n",
+			wantSubstring:  "layout_dir",
+		},
+		{
+			name:           "invalid_created_at",
+			content:        "created_at = not-a-date\n",
+			wantSubstring:  "created_at",
+		},
+		{
+			name:           "empty_created_at",
+			content:        "created_at = \n",
+			wantSubstring:  "created_at",
+		},
+	}
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			t.Parallel()
+			_, err := readUSBVolumeConfigBytes([]byte(tc.content))
+			if err == nil {
+				t.Fatal("expected error")
+			}
+			if !strings.Contains(err.Error(), tc.wantSubstring) {
+				t.Fatalf("error %q does not contain %q", err.Error(), tc.wantSubstring)
+			}
+		})
+	}
+}
+
+func TestFileURLForPath(t *testing.T) {
+	root := t.TempDir()
+	got := FileURLForPath(t, root)
+	parsed, err := url.Parse(got)
+	if err != nil {
+		t.Fatalf("parse URL: %v", err)
+	}
+	if parsed.Scheme != "file" {
+		t.Fatalf("scheme %q, want file", parsed.Scheme)
+	}
+	if parsed.Path == "" || parsed.Path[0] != '/' {
+		t.Fatalf("expected absolute path in URL, got path=%q for %q", parsed.Path, got)
+	}
+	if !strings.HasPrefix(got, "file:///") {
+		t.Fatalf("expected canonical file URL with empty authority (file:///...), got %q", got)
+	}
+}