/*
 * Copyright 2016-present Facebook, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License. You may obtain
 * a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */

package com.facebook.buck.cxx;

import com.facebook.buck.model.Flavor;
import com.google.common.hash.Hashing;

import java.nio.charset.StandardCharsets;
import java.nio.file.Paths;

public class CxxFlavorSanitizer {
  private CxxFlavorSanitizer() {
  }

  public static String sanitize(String name) {
    String fileName = Paths.get(name).getFileName().toString();
    // The hash prevents collisions between "an/example.c", "an_example.c" etc.
    return Flavor.replaceInvalidCharacters(fileName) +
        Hashing.murmur3_32().hashString(name, StandardCharsets.UTF_8);
  }
}

/*
 * Copyright 2016-present Facebook, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License. You may obtain
 * a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */

package com.facebook.buck.cxx;

import com.facebook.buck.model.Flavor;
import com.google.common.hash.Hashing;

import java.nio.charset.StandardCharsets;

public class CxxFlavorSanitizer {
  private CxxFlavorSanitizer() {
  }

  public static String sanitize(String name) {
    // The hash prevents collisions between "an/example.c", "an_example.c" etc.
    return Flavor.replaceInvalidCharacters(name) +
        Hashing.murmur3_32().hashString(name, StandardCharsets.UTF_8);
  }
}

--- 
+++ 
@@ -20,14 +20,16 @@
 import com.google.common.hash.Hashing;
 
 import java.nio.charset.StandardCharsets;
+import java.nio.file.Paths;
 
 public class CxxFlavorSanitizer {
   private CxxFlavorSanitizer() {
   }
 
   public static String sanitize(String name) {
+    String fileName = Paths.get(name).getFileName().toString();
     // The hash prevents collisions between "an/example.c", "an_example.c" etc.
-    return Flavor.replaceInvalidCharacters(name) +
+    return Flavor.replaceInvalidCharacters(fileName) +
         Hashing.murmur3_32().hashString(name, StandardCharsets.UTF_8);
   }
 }
Use shorter flavor names for cxx rules

Summary:Instead of using file path in the cxx rule flavor, only use its
last element. This will shorten the directory names used for
rules' outputs, which are currently gettting very close to the
filesystem limit. This should be safe because we still append a
hash of the full path to the flavor and it should not be too
confusing because we still use the file name in the flavor.

Test Plan: CI.

Reviewed By: Coneko

fb-gh-sync-id: bf46338
shipit-source-id: bf46338
