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// Copyright 2015 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.rules.apple;
import com.google.common.base.Splitter;
import com.google.devtools.build.lib.vfs.FileSystemUtils;
import com.google.devtools.build.lib.vfs.Path;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.List;
import javax.annotation.Nullable;
/**
* Manages the xcrun cache file for mapping sdk identifiers to their root absolute paths. Cache
* entries are read with {@link #getSdkRoot} and written with {@link #writeSdkRoot}.
*
* <p> Note that multiple threads may hold instances of this class and be interacting with
* the same cache file. As a result, it is possible multiple threads may write the same entry to
* cache. This is fine, as {@link #getSdkRoot} will simply return the first found entry. The value
* for any given key should be stable without a full clean of the bazel output directory (and
* consequent removal of the cache file).
*/
class XcrunCacheManager {
private final Path cachePath;
private final String developerDir;
/**
* @param cachePath path to the cache file; this file must exist, but may be empty
* @param developerDir the developer directory (absolute path) from which to obtain sdk root paths
*/
XcrunCacheManager(Path cachePath, String developerDir) {
this.cachePath = cachePath;
this.developerDir = developerDir;
}
/**
* Returns the SDKROOT associated with the given sdk string as its entry exists in the file cache,
* or null if the entry is not present in the cache. If there is more than one value for the
* given key, the first value is returned.
*
* @param sdkString platform concatenated with version number, as {@code xcrun} accepts
* as input, for example "iphoneos9.0"
*/
@Nullable
String getSdkRoot(String sdkString) throws IOException {
Iterable<String> cacheContents = FileSystemUtils.readLines(cachePath, StandardCharsets.UTF_8);
for (String cacheLine : cacheContents) {
if (cacheLine.isEmpty()) {
continue;
}
List<String> items = Splitter.on(':').splitToList(cacheLine);
if (items.size() != 3) {
throw new IllegalStateException(
String.format("xcrun cache is malformed, line: '%s'", cacheLine));
}
String developerDir = items.get(0);
String sdkIdentifier = items.get(1);
String sdkRoot = items.get(2);
if (sdkIdentifier.equals(sdkString) && developerDir.equals(this.developerDir)) {
return sdkRoot;
}
}
return null;
}
/**
* Write an entry to the cache pairing the given sdk version string with the given SDKROOT.
* No validation is made regarding whether there are redundant or conflicting entries in the
* cache; it is thus the responsibility of the caller to ensure that no entry for the given
* key is present in the cache, prior to calling this. (Entries added to the cache file with
* the same key as a prior entry will not be used.)
*
* @param sdkString platform concatenated with version number, as {@code xcrun} accepts
* as input, for example "iphoneos9.0"
* @param sdkRoot an absolute path to the SDKROOT for the sdk
*/
void writeSdkRoot(String sdkString, String sdkRoot) throws IOException {
FileSystemUtils.appendLinesAs(cachePath, StandardCharsets.UTF_8,
String.format("%s:%s:%s", this.developerDir, sdkString, sdkRoot));
}
}
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