refactor: unify path management and complete profile management system

- Create internal/paths package for unified config and runtime directory resolution
- Implement robust WireGuard config parsing in pkg/wgconf
- Implement profile management subcommands: list, import, configure, delete, stop
- Fix namespace pinning path collisions (separating .ns files from pids directories)
- Implement and verify namespace unpinning logic
- Fix linting errors and improve error handling across the project

1 files changed, 62 insertions, 0 deletions

diff --git a/internal/paths/paths.go b/internal/paths/paths.go
new file mode 100644
index 0000000..f512ad1
--- /dev/null
+++ b/internal/paths/paths.go
@@ -0,0 +1,62 @@
+package paths
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+)
+
+// PathManager handles the resolution of configuration and runtime directories.
+// By using a struct, we can instantiate different managers for parallel tests.
+type PathManager struct {
+	ConfigDirOverride   string
+	RuntimeBaseOverride string
+}
+
+// NewPathManager creates a PathManager with the given overrides.
+func NewPathManager(configOverride, runtimeOverride string) *PathManager {
+	return &PathManager{
+		ConfigDirOverride:   configOverride,
+		RuntimeBaseOverride: runtimeOverride,
+	}
+}
+
+// ConfigDir returns the persistent storage path for .conf files.
+func (pm *PathManager) ConfigDir() string {
+	if pm.ConfigDirOverride != "" {
+		return pm.ConfigDirOverride
+	}
+
+	configHome := os.Getenv("XDG_CONFIG_HOME")
+	if configHome == "" {
+		home, err := os.UserHomeDir()
+		if err != nil {
+			return "/etc/wg-wrap/profiles" // Fallback
+		}
+		configHome = filepath.Join(home, ".config")
+	}
+	return filepath.Join(configHome, "wg-wrap", "profiles")
+}
+
+// RuntimeBaseDir returns the base ephemeral path.
+func (pm *PathManager) RuntimeBaseDir() string {
+	if pm.RuntimeBaseOverride != "" {
+		return pm.RuntimeBaseOverride
+	}
+
+	if envDir := os.Getenv("XDG_RUNTIME_DIR"); envDir != "" {
+		return envDir
+	}
+	uid := os.Getuid()
+	return fmt.Sprintf("/run/user/%d", uid)
+}
+
+// ProfileNamespacePath returns the specific path for a pinned namespace.
+func (pm *PathManager) ProfileNamespacePath(profile string) string {
+	return filepath.Join(pm.RuntimeBaseDir(), "profiles", profile+".ns")
+}
+
+// ProfilePidsDir returns the path for PID tracking.
+func (pm *PathManager) ProfilePidsDir(profile string) string {
+	return filepath.Join(pm.RuntimeBaseDir(), "profiles", profile, "pids")
+}