updater: do not show dialog for creation new file(s) with changes only in upper/lower case name.

updater/src/com/intellij/updater/CreateAction.java

@@ -39,7 +39,7 @@ public class CreateAction extends PatchAction {
     ValidationResult result = doValidateAccess(toFile, ValidationResult.Action.CREATE);
     if (result != null) return result;
 
-    if (toFile.exists()) {
+    if (toFile.exists() && Runner.isPlatformCaseSensitive()) {
       ValidationResult.Option[] options = myPatch.isStrict()
                                           ? new ValidationResult.Option[]{ValidationResult.Option.REPLACE}
                                           : new ValidationResult.Option[]{ValidationResult.Option.REPLACE, ValidationResult.Option.KEEP};

updater/src/com/intellij/updater/Runner.java

@@ -31,7 +31,8 @@ import java.util.zip.ZipInputStream;
 
 public class Runner {
   public static Logger logger = null;
-
+  private static String updaterLogFileName;
+  private static boolean platformCaseSensitive;
   private static final String PATCH_FILE_NAME = "patch-file.zip";
 
   public static void main(String[] args) throws Exception {
@@ -46,6 +47,7 @@ public class Runner {
       String newFolder = args[4];
       String patchFile = args[5];
       initLogger();
+      checkIfPlatformCaseSensitive();
 
       // See usage for an explanation of these flags
       boolean binary = Arrays.asList(args).contains("--zip_as_binary");
@@ -83,6 +85,7 @@ public class Runner {
     else if (args.length >= 2 && ("install".equals(args[0]) || "apply".equals(args[0]))) {
       String destFolder = args[1];
       initLogger();
+      checkIfPlatformCaseSensitive();
       logger.info("destFolder: " + destFolder);
 
       if ("install".equals(args[0])) {
@@ -126,13 +129,24 @@ public class Runner {
     return dir;
   }
 
+  private static void checkIfPlatformCaseSensitive() throws Exception {
+    platformCaseSensitive = new File(updaterLogFileName.toLowerCase()).exists() &&
+                            new File(updaterLogFileName.toUpperCase()).exists() ?
+                            false : true;
+  }
+
+  public static boolean isPlatformCaseSensitive() {
+    return platformCaseSensitive;
+  }
+
   public static void initLogger() {
     if (logger == null) {
       long requiredFreeSpace = 1000000;
       String logFolder = getDir(requiredFreeSpace);
+      updaterLogFileName = new File(logFolder, "idea_updater.log").getAbsolutePath();
       FileAppender update = new FileAppender();
+      update.setFile(updaterLogFileName);
 
-      update.setFile(new File(logFolder, "idea_updater.log").getAbsolutePath());
       update.setLayout(new PatternLayout("%d{dd MMM yyyy HH:mm:ss} %-5p %C{1}.%M - %m%n"));
       update.setThreshold(Level.ALL);
       update.setAppend(true);