134 lines
4.5 KiB
C++
134 lines
4.5 KiB
C++
// Copyright (c) 2022 GitHub, Inc.
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// Use of this source code is governed by the MIT license that can be
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// found in the LICENSE file.
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#include "shell/browser/electron_browser_main_parts.h"
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#include "base/command_line.h"
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#include "base/environment.h"
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#include "ui/ozone/public/ozone_switches.h"
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#if BUILDFLAG(OZONE_PLATFORM_WAYLAND)
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#include "base/files/file_path.h"
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#include "base/files/file_util.h"
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#include "base/nix/xdg_util.h"
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#include "base/threading/thread_restrictions.h"
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#endif
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#if BUILDFLAG(OZONE_PLATFORM_WAYLAND)
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constexpr char kPlatformWayland[] = "wayland";
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bool HasWaylandDisplay(base::Environment* env) {
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std::string wayland_display;
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const bool has_wayland_display =
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env->GetVar("WAYLAND_DISPLAY", &wayland_display) &&
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!wayland_display.empty();
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if (has_wayland_display)
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return true;
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std::string xdg_runtime_dir;
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const bool has_xdg_runtime_dir =
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env->GetVar("XDG_RUNTIME_DIR", &xdg_runtime_dir) &&
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!xdg_runtime_dir.empty();
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if (has_xdg_runtime_dir) {
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auto wayland_server_pipe =
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base::FilePath(xdg_runtime_dir).Append("wayland-0");
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// Normally, this should happen exactly once, at the startup of the main
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// process.
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base::ScopedAllowBlocking allow_blocking;
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return base::PathExists(wayland_server_pipe);
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}
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return false;
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}
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#endif // BUILDFLAG(OZONE_PLATFORM_WAYLAND)
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#if BUILDFLAG(OZONE_PLATFORM_X11)
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constexpr char kPlatformX11[] = "x11";
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#endif
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namespace electron {
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namespace {
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// Evaluates the environment and returns the effective platform name for the
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// given |ozone_platform_hint|.
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// For the "auto" value, returns "wayland" if the XDG session type is "wayland",
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// "x11" otherwise.
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// For the "wayland" value, checks if the Wayland server is available, and
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// returns "x11" if it is not.
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// See https://crbug.com/1246928.
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std::string MaybeFixPlatformName(const std::string& ozone_platform_hint) {
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#if BUILDFLAG(OZONE_PLATFORM_WAYLAND)
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// Wayland is selected if both conditions below are true:
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// 1. The user selected either 'wayland' or 'auto'.
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// 2. The XDG session type is 'wayland', OR the user has selected 'wayland'
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// explicitly and a Wayland server is running.
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// Otherwise, fall back to X11.
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if (ozone_platform_hint == kPlatformWayland ||
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ozone_platform_hint == "auto") {
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auto env(base::Environment::Create());
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std::string xdg_session_type;
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const bool has_xdg_session_type =
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env->GetVar(base::nix::kXdgSessionTypeEnvVar, &xdg_session_type) &&
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!xdg_session_type.empty();
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if ((has_xdg_session_type && xdg_session_type == "wayland") ||
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(ozone_platform_hint == kPlatformWayland &&
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HasWaylandDisplay(env.get()))) {
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return kPlatformWayland;
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}
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}
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#endif // BUILDFLAG(OZONE_PLATFORM_WAYLAND)
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#if BUILDFLAG(OZONE_PLATFORM_X11)
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if (ozone_platform_hint == kPlatformX11) {
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return kPlatformX11;
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}
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#if BUILDFLAG(OZONE_PLATFORM_WAYLAND)
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if (ozone_platform_hint == kPlatformWayland ||
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ozone_platform_hint == "auto") {
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// We are here if:
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// - The binary has both X11 and Wayland backends.
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// - The user wanted Wayland but that did not work, otherwise it would have
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// been returned above.
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if (ozone_platform_hint == kPlatformWayland) {
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LOG(WARNING) << "No Wayland server is available. Falling back to X11.";
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} else {
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LOG(WARNING) << "This is not a Wayland session. Falling back to X11. "
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"If you need to run Chrome on Wayland using some "
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"embedded compositor, e. g., Weston, please specify "
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"Wayland as your preferred Ozone platform, or use "
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"--ozone-platform=wayland.";
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}
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return kPlatformX11;
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}
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#endif // BUILDFLAG(OZONE_PLATFORM_WAYLAND)
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#endif // BUILDFLAG(OZONE_PLATFORM_X11)
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return ozone_platform_hint;
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}
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} // namespace
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void ElectronBrowserMainParts::DetectOzonePlatform() {
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auto* const command_line = base::CommandLine::ForCurrentProcess();
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if (!command_line->HasSwitch(switches::kOzonePlatform)) {
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const auto ozone_platform_hint =
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command_line->GetSwitchValueASCII(switches::kOzonePlatformHint);
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if (!ozone_platform_hint.empty()) {
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command_line->AppendSwitchASCII(
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switches::kOzonePlatform, MaybeFixPlatformName(ozone_platform_hint));
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}
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}
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auto env = base::Environment::Create();
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std::string desktop_startup_id;
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if (env->GetVar("DESKTOP_STARTUP_ID", &desktop_startup_id))
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command_line->AppendSwitchASCII("desktop-startup-id", desktop_startup_id);
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}
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} // namespace electron
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