[feat] add in-app updates for desktop installations

apps/desktop/src/platform/macos/updater/update_platform.cpp

@@ -0,0 +1,72 @@
+#include "updater/update_platform.h"
+
+#include <libproc.h>
+#include <mach-o/dyld.h>
+#include <unistd.h>
+#include <chrono>
+#include <stdexcept>
+#include <thread>
+
+namespace crossdesk::updater {
+namespace {
+std::string ShellQuote(const std::string& value) {
+  std::string result = "'";
+  for (char c : value) result += c == '\'' ? "'\\''" : std::string(1, c);
+  return result + "'";
+}
+std::string AppleScriptString(const std::string& value) {
+  std::string result = "\"";
+  for (char c : value) {
+    if (c == '\\' || c == '"') result += '\\';
+    result += c;
+  }
+  return result + "\"";
+}
+}  // namespace
+fs::path ExecutablePath() {
+  uint32_t size = 0;
+  _NSGetExecutablePath(nullptr, &size);
+  std::vector<char> buffer(size);
+  if (_NSGetExecutablePath(buffer.data(), &size)) throw std::runtime_error("Cannot locate executable");
+  return fs::canonical(buffer.data());
+}
+bool SupportedInstallation(const fs::path& application) {
+  return application == fs::path("/Applications/CrossDesk.app/Contents/MacOS/CrossDesk") &&
+         fs::is_regular_file(HelperPath(application));
+}
+int RunElevated(const fs::path& executable, const fs::path& job) {
+  const auto command = ShellQuote(executable.string()) + " --install " + ShellQuote(job.string());
+  return Run("/usr/bin/osascript", {"-e", "do shell script " +
+             AppleScriptString(command) + " with administrator privileges"});
+}
+void WaitForApplicationExit(const fs::path& application) {
+  const auto deadline = std::chrono::steady_clock::now() + std::chrono::seconds(45);
+  do {
+    const int count = proc_listallpids(nullptr, 0);
+    if (count <= 0) throw std::runtime_error("Cannot enumerate CrossDesk processes");
+    std::vector<pid_t> pids(static_cast<std::size_t>(count) + 256);
+    const int length = proc_listallpids(pids.data(), static_cast<int>(pids.size() * sizeof(pid_t)));
+    if (length <= 0 || length >= static_cast<int>(pids.size()))
+      throw std::runtime_error("Cannot inspect all CrossDesk processes");
+    bool running = false;
+    for (int i = 0; i < length; ++i) {
+      char path[PROC_PIDPATHINFO_MAXSIZE]{};
+      if (proc_pidpath(pids[i], path, sizeof(path)) > 0) {
+        if (fs::path(path) == application) running = true;
+      } else {
+        char name[1024]{};
+        if (proc_name(pids[i], name, sizeof(name)) > 0 && std::string(name) == "CrossDesk")
+          running = true;
+      }
+    }
+    if (!running) return;
+    std::this_thread::sleep_for(std::chrono::milliseconds(200));
+  } while (std::chrono::steady_clock::now() < deadline);
+  throw std::runtime_error("CrossDesk is still running in another session");
+}
+void InstallPackage(const fs::path& package, const fs::path&) {
+  if (Run("/usr/sbin/installer", {"-pkg", package.string(), "-target", "/"}) != 0)
+    throw std::runtime_error("The macOS installer could not install the update");
+}
+void Restart(const fs::path&) { Launch("/usr/bin/open", {"/Applications/CrossDesk.app"}); }
+}  // namespace crossdesk::updater