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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.
#include "src/main/cpp/util/file_linux.h"
#include <sys/stat.h>
#include <stdlib.h> // getenv
#include <unistd.h> // access
#include <vector>
#include "src/main/cpp/util/file.h"
#include "src/main/cpp/util/exit_code.h"
#include "src/main/cpp/util/errors.h"
#include "src/main/cpp/util/strings.h"
using std::pair;
namespace blaze_util {
string Which(const string &executable) {
char *path_cstr = getenv("PATH");
if (path_cstr == NULL || path_cstr[0] == '\0') {
die(blaze_exit_code::LOCAL_ENVIRONMENTAL_ERROR,
"Could not get PATH to find %s", executable.c_str());
}
string path(path_cstr);
std::vector<std::string> pieces = blaze_util::Split(path, ':');
for (auto piece : pieces) {
if (piece.empty()) {
piece = ".";
}
struct stat file_stat;
string candidate = blaze_util::JoinPath(piece, executable);
if (access(candidate.c_str(), X_OK) == 0 &&
stat(candidate.c_str(), &file_stat) == 0 &&
S_ISREG(file_stat.st_mode)) {
return candidate;
}
}
return "";
}
} // namespace blaze_util
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