[flutter_tools] fix missing cmake (#103761)

packages/flutter_tools/lib/src/linux/build_linux.dart

@@ -124,7 +124,9 @@ Future<void> _runCmake(String buildModeName, Directory sourceDir, Directory buil
   final bool needCrossBuildOptionsForArm64 = needCrossBuild
       && targetPlatform == TargetPlatform.linux_arm64;
   int result;
-  try {
+  if (!globals.processManager.canRun('cmake')) {
+    throwToolExit(globals.userMessages.cmakeMissing);
+  }
   result = await globals.processUtils.stream(
     <String>[
       'cmake',
@@ -149,9 +151,6 @@ Future<void> _runCmake(String buildModeName, Directory sourceDir, Directory buil
     },
     trace: true,
   );
-  } on ArgumentError {
-    throwToolExit("cmake not found. Run 'flutter doctor' for more information.");
-  }
   if (result != 0) {
     throwToolExit('Unable to generate build files');
   }

packages/flutter_tools/test/commands.shard/hermetic/build_linux_test.dart

@@ -172,18 +172,15 @@ void main() {
     OperatingSystemUtils: () => FakeOperatingSystemUtils(),
   });
 
-  testUsingContext('Handles argument error from missing cmake', () async {
+  testUsingContext('Handles missing cmake', () async {
     final BuildCommand command = BuildCommand();
     setUpMockProjectFilesForBuild();
-    processManager = FakeProcessManager.list(<FakeCommand>[
-      cmakeCommand('release', onRun: () {
-        throw ArgumentError();
-      }),
-    ]);
+    processManager = FakeProcessManager.empty()
+        ..excludedExecutables.add('cmake');
 
     expect(createTestCommandRunner(command).run(
       const <String>['build', 'linux', '--no-pub']
-    ), throwsToolExit(message: "cmake not found. Run 'flutter doctor' for more information."));
+    ), throwsToolExit(message: 'CMake is required for Linux development.'));
   }, overrides: <Type, Generator>{
     FileSystem: () => fileSystem,
     ProcessManager: () => processManager,