Updater: do not create a patch file in the temp dir until it is not fully downloaded (IDEA-82564) (cherry picked from commit caa341f)

platform/platform-impl/src/com/intellij/openapi/updateSettings/impl/UpdateChecker.java

@@ -613,13 +613,13 @@ public final class UpdateChecker {
     OutputStream out = null;
 
     String platform = PlatformUtils.getPlatformPrefix();
-    String patchFileName = ("jetbrains.patch.jar." + platform).toLowerCase();
-    File patchFile = new File(FileUtil.getTempDirectory(), patchFileName);
+
+    File tempFile = FileUtil.createTempFile(platform, "patch", true);
 
     try {
       connection = new URL(new URL(getPatchesUrl()), fileName).openConnection();
       in = UrlConnectionUtil.getConnectionInputStreamWithException(connection, i);
-      out = new BufferedOutputStream(new FileOutputStream(patchFile));
+      out = new BufferedOutputStream(new FileOutputStream(tempFile));
 
       i.setIndeterminate(false);
 
@@ -636,23 +636,16 @@ public final class UpdateChecker {
         i.setText2((read / 1024) + "/" + (total / 1024) + " KB");
       }
     }
-    catch (IOException e) {
-      patchFile.delete();
-      throw e;
-    }
-    catch (ProcessCanceledException e) {
-      patchFile.delete();
-      throw e;
-    }
-    catch (Throwable e) {
-      patchFile.delete();
-      throw new RuntimeException(e);
-    }
     finally {
       if (out != null) out.close();
       if (in != null) in.close();
       if (connection instanceof HttpURLConnection) ((HttpURLConnection)connection).disconnect();
     }
+
+    String patchFileName = ("jetbrains.patch.jar." + platform).toLowerCase();
+    File patchFile = new File(FileUtil.getTempDirectory(), patchFileName);
+    FileUtil.copy(tempFile, patchFile);
+    FileUtil.delete(tempFile);
   }
 
   public static Set<String> getDisabledToUpdatePlugins() {