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// Copyright 2014 The Bazel Authors. All rights reserved.
//
// 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.google.devtools.build.lib.skyframe;
import com.google.common.base.Joiner;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import com.google.devtools.build.lib.skyframe.serialization.autocodec.AutoCodec.VisibleForSerialization;
import com.google.devtools.build.lib.vfs.RootedPath;
/** Exception indicating that a cycle was found in the filesystem. */
@VisibleForSerialization
public class FileSymlinkCycleException extends FileSymlinkException {
private final ImmutableList<RootedPath> pathToCycle;
private final ImmutableList<RootedPath> cycle;
public FileSymlinkCycleException(
ImmutableList<RootedPath> pathToCycle, ImmutableList<RootedPath> cycle) {
// The cycle itself has already been reported by FileSymlinkCycleUniquenessValue, but we still
// want to have a readable #getMessage.
super("Symlink cycle");
this.pathToCycle = pathToCycle;
this.cycle = cycle;
}
/**
* The symlink path to the symlink cycle. For example, suppose 'a' -> 'b' -> 'c' -> 'd' -> 'c'.
* The path to the cycle is 'a', 'b'.
*/
@VisibleForSerialization
public ImmutableList<RootedPath> getPathToCycle() {
return pathToCycle;
}
/**
* The symlink cycle. For example, suppose 'a' -> 'b' -> 'c' -> 'd' -> 'c'. The cycle is 'c', 'd'.
*/
@VisibleForSerialization
public ImmutableList<RootedPath> getCycle() {
return cycle;
}
@Override
public String getUserFriendlyMessage() {
return "Symlink cycle: "
+ Joiner.on("- > ").join(Iterables.transform(cycle, RootedPath::asPath));
}
}