Add workspace filesystem helpers

internal/core/workspace/settings.go

@@ -0,0 +1,76 @@
+package workspace
+
+import (
+	"fmt"
+	"path/filepath"
+	"strings"
+
+	"gitea.maximumdirect.net/eric/notarius/internal/core/config"
+)
+
+type Settings struct {
+	RootDir            string
+	DiagnosticsRoot    string
+	CheckpointsRoot    string
+	DebugRoot          string
+	DiagnosticsEnabled bool
+	ResumeEnabled      bool
+	DebugEnabled       bool
+}
+
+func FromConfig(cfg config.Config) Settings {
+	root := cleanPath(cfg.Workspace.Directory)
+	settings := Settings{
+		RootDir:            root,
+		DiagnosticsEnabled: cfg.DiagnosticsEnabled(),
+	}
+	if settings.DiagnosticsEnabled {
+		settings.DiagnosticsRoot = cleanPath(cfg.Diagnostics.WorkDir)
+	}
+	if root == "" {
+		return settings
+	}
+
+	settings.CheckpointsRoot = filepath.Join(root, "checkpoints")
+	settings.DebugRoot = filepath.Join(root, "debug")
+	settings.ResumeEnabled = cfg.Workspace.Resume.Enabled
+	settings.DebugEnabled = cfg.Workspace.Debug.Enabled
+	return settings
+}
+
+func (s Settings) DiagnosticsRunDirectory(runID string) (string, error) {
+	if !s.DiagnosticsEnabled || strings.TrimSpace(s.DiagnosticsRoot) == "" {
+		return "", nil
+	}
+	return safeSingleDirectory(s.DiagnosticsRoot, runID, "diagnostics run ID")
+}
+
+func (s Settings) CheckpointIdentityDirectory(identity string) (string, error) {
+	if !s.ResumeEnabled || strings.TrimSpace(s.CheckpointsRoot) == "" {
+		return "", nil
+	}
+	return SafePath(s.CheckpointsRoot, identity)
+}
+
+func (s Settings) DebugRunDirectory(runID string) (string, error) {
+	if !s.DebugEnabled || strings.TrimSpace(s.DebugRoot) == "" {
+		return "", nil
+	}
+	return safeSingleDirectory(s.DebugRoot, runID, "debug run ID")
+}
+
+func cleanPath(path string) string {
+	path = strings.TrimSpace(path)
+	if path == "" {
+		return ""
+	}
+	return filepath.Clean(path)
+}
+
+func safeSingleDirectory(root string, name string, label string) (string, error) {
+	name = strings.TrimSpace(name)
+	if strings.Contains(name, "/") || strings.Contains(name, `\`) {
+		return "", fmt.Errorf("%s %q must be a single directory name", label, name)
+	}
+	return SafePath(root, name)
+}