internal/system: pass syscall error message

This makes wrapped syscall errors produce a cleaner error message.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/system/output.go

@@ -26,6 +26,7 @@ func (e *OpError) Error() string {
 	switch {
 	case errors.As(e.Err, new(*os.PathError)),
 		errors.As(e.Err, new(*os.LinkError)),
+		errors.As(e.Err, new(*os.SyscallError)),
 		errors.As(e.Err, new(*net.OpError)),
 		errors.As(e.Err, new(*container.StartError)):
 		return e.Err.Error()

internal/system/output_test.go

@@ -44,6 +44,11 @@ func TestOpError(t *testing.T) {
 			syscall.EISDIR, syscall.ENOTDIR,
 			"cannot stat /run/dbus: is a directory"},
 
+		{"syscall", newOpError("pipewire", os.NewSyscallError("pipe2", syscall.ENOTRECOVERABLE), false),
+			"pipe2: state not recoverable",
+			syscall.ENOTRECOVERABLE, syscall.ENOTDIR,
+			"cannot pipe2: state not recoverable"},
+
 		{"net", newOpError("wayland", &net.OpError{Op: "dial", Net: "unix", Addr: &net.UnixAddr{Name: "/run/user/1000/wayland-1", Net: "unix"}, Err: syscall.ENOENT}, false),
 			"dial unix /run/user/1000/wayland-1: no such file or directory",
 			syscall.ENOENT, syscall.EPERM,