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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_platform.h"
#include <dirent.h> // DIR, dirent, opendir, closedir
#include <fcntl.h> // O_RDONLY
#include <limits.h> // PATH_MAX
#include <stdlib.h> // getenv
#include <sys/stat.h>
#include <unistd.h> // access, open, close, fsync
#include <utime.h> // utime
#include <vector>
#include "src/main/cpp/util/errors.h"
#include "src/main/cpp/util/exit_code.h"
#include "src/main/cpp/util/file.h"
#include "src/main/cpp/util/strings.h"
namespace blaze_util {
using std::pair;
using std::string;
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 "";
}
bool PathExists(const string& path) {
return access(path.c_str(), F_OK) == 0;
}
bool CanAccess(const string& path, bool read, bool write, bool exec) {
int mode = 0;
if (read) {
mode |= R_OK;
}
if (write) {
mode |= W_OK;
}
if (exec) {
mode |= X_OK;
}
return access(path.c_str(), mode) == 0;
}
bool IsDirectory(const string& path) {
struct stat buf;
return stat(path.c_str(), &buf) == 0 && S_ISDIR(buf.st_mode);
}
void SyncFile(const string& path) {
// fsync always fails on Cygwin with "Permission denied" for some reason.
#ifndef __CYGWIN__
const char* file_path = path.c_str();
int fd = open(file_path, O_RDONLY);
if (fd < 0) {
pdie(blaze_exit_code::LOCAL_ENVIRONMENTAL_ERROR,
"failed to open '%s' for syncing", file_path);
}
if (fsync(fd) < 0) {
pdie(blaze_exit_code::LOCAL_ENVIRONMENTAL_ERROR, "failed to sync '%s'",
file_path);
}
close(fd);
#endif
}
time_t GetMtimeMillisec(const string& path) {
struct stat buf;
if (stat(path.c_str(), &buf)) {
return -1;
} else {
return buf.st_mtime;
}
}
bool SetMtimeMillisec(const string& path, time_t mtime) {
struct utimbuf times = {mtime, mtime};
return utime(path.c_str(), ×) == 0;
}
string GetCwd() {
char cwdbuf[PATH_MAX];
if (getcwd(cwdbuf, sizeof cwdbuf) == NULL) {
pdie(blaze_exit_code::INTERNAL_ERROR, "getcwd() failed");
}
return string(cwdbuf);
}
bool ChangeDirectory(const string& path) {
return chdir(path.c_str()) == 0;
}
void ForEachDirectoryEntry(const string &path,
DirectoryEntryConsumer *consume) {
DIR *dir;
struct dirent *ent;
if ((dir = opendir(path.c_str())) == NULL) {
// This is not a directory or it cannot be opened.
return;
}
while ((ent = readdir(dir)) != NULL) {
if (!strcmp(ent->d_name, ".") || !strcmp(ent->d_name, "..")) {
continue;
}
string filename(blaze_util::JoinPath(path, ent->d_name));
bool is_directory;
if (ent->d_type == DT_UNKNOWN) {
struct stat buf;
if (lstat(filename.c_str(), &buf) == -1) {
die(blaze_exit_code::INTERNAL_ERROR, "stat failed");
}
is_directory = S_ISDIR(buf.st_mode);
} else {
is_directory = (ent->d_type == DT_DIR);
}
consume->Consume(filename, is_directory);
}
closedir(dir);
}
} // namespace blaze_util
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