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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.unix;
import com.google.devtools.build.lib.shell.AbnormalTerminationException;
import com.google.devtools.build.lib.shell.Command;
import com.google.devtools.build.lib.shell.CommandException;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
/**
* Provides utility methods for working with directories in a Unix environment.
*/
public final class Directories {
/**
* Deletes a file or directory and all contents recursively, like {@code rm -rf file}.
*
* <p>If the file argument is a symbolic link, the link will be deleted but not the target of the
* link. If the argument is a directory, symbolic links within the directory will not be followed.
* If the argument does not exist, throws a FileNotFoundException.
*
* @param file the file or directory to delete
* @throws FileNotFoundException if the file or directory does not exist
* @throws IOException if an I/O error occurs
*/
public static void deleteRecursively(File file) throws IOException {
deleteRecursivelyImpl(file, true);
}
/**
* Deletes a file or directory and all contents recursively, like {@code rm -rf file}, if it
* exists.
*
* <p>If the file argument is a symbolic link, the link will be deleted but not the target of the
* link. If the argument is a directory, symbolic links within the directory will not be followed.
*
* @param file the file or directory to delete
* @return {@code true} if the file or directory was deleted by this method; {@code false} if the
* file or directory could not be deleted because it did not exist
* @throws IOException if an I/O error occurs
*/
public static boolean deleteRecursivelyIfExists(File file) throws IOException {
return deleteRecursivelyImpl(file, false);
}
private static boolean deleteRecursivelyImpl(File file, boolean failIfFileDoesNotExist)
throws IOException {
if (!file.exists()) {
if (failIfFileDoesNotExist) {
throw new FileNotFoundException(file.getPath());
} else {
return false;
}
}
String filePath = file.getPath();
if (!filePath.isEmpty() && filePath.charAt(0) == '-') {
filePath = "./" + filePath;
}
try {
new Command(new String[] {"/bin/rm", "-rf", filePath}).execute();
} catch (AbnormalTerminationException e) {
String message =
e.getResult().getTerminationStatus() + ": " + new String(e.getResult().getStderr());
throw new IOException(message, e);
} catch (CommandException e) {
throw new IOException(e);
}
return true;
}
private Directories() {}
}
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