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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/linux/display_server_utils.h"
#include <optional>
#include <string>
#include "base/command_line.h"
#include "base/environment.h"
#include "base/logging.h"
#include "ui/base/ozone_buildflags.h"
#include "ui/ozone/public/ozone_switches.h"
#if BUILDFLAG(IS_OZONE_WAYLAND)
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/nix/xdg_util.h"
#include "ui/base/ui_base_features.h"
#endif
namespace ui {
namespace {
#if BUILDFLAG(IS_OZONE_X11)
constexpr char kPlatformX11[] = "x11";
#endif
#if BUILDFLAG(IS_OZONE_WAYLAND)
constexpr char kPlatformWayland[] = "wayland";
bool InspectWaylandDisplay(base::Environment& env) {
std::optional<std::string> wayland_display = env.GetVar("WAYLAND_DISPLAY");
if (wayland_display.has_value()) {
return true;
}
std::optional<std::string> xdg_runtime_dir = env.GetVar("XDG_RUNTIME_DIR");
if (xdg_runtime_dir.has_value()) {
constexpr char kDefaultWaylandSocketName[] = "wayland-0";
const auto wayland_socket_path =
base::FilePath(*xdg_runtime_dir).Append(kDefaultWaylandSocketName);
if (base::PathExists(wayland_socket_path)) {
env.SetVar("WAYLAND_DISPLAY", kDefaultWaylandSocketName);
return true;
}
}
return false;
}
#endif // BUILDFLAG(IS_OZONE_WAYLAND)
// Evaluates the environment and returns the effective platform name for the
// given |ozone_platform_hint|.
// For the "auto" value, returns "wayland" if the XDG session type is "wayland",
// "x11" otherwise.
// For the "wayland" value, checks if the Wayland server is available, and
// returns "x11" if it is not. See https://crbug.com/1246928.
std::string MaybeFixPlatformName(const std::string& platform_hint) {
#if BUILDFLAG(IS_OZONE_WAYLAND)
// Wayland is selected if both conditions below are true:
// 1. The user selected either 'wayland' or 'auto'.
// 2. The XDG session type is 'wayland', OR the user has selected 'wayland'
// explicitly and a Wayland server is running.
// Otherwise, fall back to X11.
if (platform_hint == kPlatformWayland || platform_hint == "auto") {
auto env = base::Environment::Create();
std::optional<std::string> xdg_session_type =
env->GetVar(base::nix::kXdgSessionTypeEnvVar);
if ((xdg_session_type.has_value() && *xdg_session_type == "wayland") ||
(platform_hint == kPlatformWayland && HasWaylandDisplay(*env))) {
return kPlatformWayland;
}
}
#endif // BUILDFLAG(IS_OZONE_WAYLAND)
#if BUILDFLAG(IS_OZONE_X11)
if (platform_hint == kPlatformX11) {
return kPlatformX11;
}
#if BUILDFLAG(IS_OZONE_WAYLAND)
if (platform_hint == kPlatformWayland || platform_hint == "auto") {
// We are here if:
// - The binary has both X11 and Wayland backends.
// - The user wanted Wayland but that did not work, otherwise it would have
// been returned above.
if (platform_hint == kPlatformWayland) {
LOG(WARNING) << "No Wayland server is available. Falling back to X11.";
} else {
LOG(WARNING) << "This is not a Wayland session. Falling back to X11. "
"If you need to run Chrome on Wayland using some "
"embedded compositor, e.g. Weston, please specify "
"Wayland as your preferred Ozone platform, or use "
"--ozone-platform=wayland.";
}
return kPlatformX11;
}
#endif // BUILDFLAG(IS_OZONE_WAYLAND)
#endif // BUILDFLAG(IS_OZONE_X11)
return platform_hint;
}
void MaybeOverrideDefaultAsAuto(base::CommandLine& command_line) {
#if BUILDFLAG(IS_OZONE_WAYLAND)
const auto ozone_platform_hint =
command_line.GetSwitchValueASCII(switches::kOzonePlatformHint);
if (!ozone_platform_hint.empty() ||
!base::FeatureList::IsEnabled(
features::kOverrideDefaultOzonePlatformHintToAuto)) {
return;
}
command_line.AppendSwitchASCII(switches::kOzonePlatformHint, "auto");
#endif // BUILDFLAG(IS_OZONE_WAYLAND)
}
} // namespace
void SetOzonePlatformForLinuxIfNeeded(base::CommandLine& command_line) {
// On the desktop, we fix the platform name if necessary.
// See https://crbug.com/1246928.
if (!command_line.HasSwitch(switches::kOzonePlatform)) {
MaybeOverrideDefaultAsAuto(command_line);
const auto ozone_platform_hint =
command_line.GetSwitchValueASCII(switches::kOzonePlatformHint);
if (!ozone_platform_hint.empty()) {
command_line.AppendSwitchASCII(switches::kOzonePlatform,
MaybeFixPlatformName(ozone_platform_hint));
}
}
}
bool HasWaylandDisplay(base::Environment& env) {
#if !BUILDFLAG(IS_OZONE_WAYLAND)
return false;
#else
static bool has_wayland_display = InspectWaylandDisplay(env);
return has_wayland_display;
#endif // !BUILDFLAG(IS_OZONE_WAYLAND)
}
bool HasX11Display(base::Environment& env) {
#if !BUILDFLAG(IS_OZONE_X11)
return false;
#else
return env.GetVar("DISPLAY").has_value();
#endif // !BUILDFLAG(IS_OZONE_X11)
}
} // namespace ui
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