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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.
#if defined(__FreeBSD__)
# define HAVE_PROCSTAT
# define STANDARD_JAVABASE "/usr/local/openjdk8"
#elif defined(__OpenBSD__)
# define STANDARD_JAVABASE "/usr/local/jdk-17"
#else
# error This BSD is not supported
#endif
#if !defined(DEFAULT_SYSTEM_JAVABASE)
# define DEFAULT_SYSTEM_JAVABASE STANDARD_JAVABASE
#endif
#include <errno.h> // errno, ENAMETOOLONG
#include <limits.h>
#include <pwd.h>
#include <signal.h>
#include <spawn.h>
#include <stdlib.h>
#include <string.h> // strerror
#include <sys/mount.h>
#include <sys/param.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <sys/types.h>
#include <sys/un.h>
#include <unistd.h>
#if defined(HAVE_PROCSTAT)
# include <libprocstat.h> // must be included after <sys/...> headers
#endif
#include "src/main/cpp/blaze_util.h"
#include "src/main/cpp/blaze_util_platform.h"
#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/file_platform.h"
#include "src/main/cpp/util/logging.h"
#include "src/main/cpp/util/path.h"
#include "src/main/cpp/util/port.h"
#include "src/main/cpp/util/strings.h"
namespace blaze {
using blaze_util::GetLastErrorString;
using std::string;
// ${XDG_CACHE_HOME}/bazel, a.k.a. ~/.cache/bazel by default (which is the
// fallback when XDG_CACHE_HOME is not set)
string GetOutputRoot() {
string xdg_cache_home = GetPathEnv("XDG_CACHE_HOME");
if (xdg_cache_home.empty()) {
char buf[2048];
struct passwd pwbuf;
struct passwd *pw = nullptr;
int uid = getuid();
int r = getpwuid_r(uid, &pwbuf, buf, 2048, &pw);
if (r == 0 && pw != nullptr) {
xdg_cache_home = blaze_util::JoinPath(pw->pw_dir, ".cache");
} else {
return "/tmp";
}
}
return blaze_util::JoinPath(xdg_cache_home, "bazel");
}
void WarnFilesystemType(const blaze_util::Path &output_base) {
struct statfs buf = {};
if (statfs(output_base.AsNativePath().c_str(), &buf) < 0) {
BAZEL_LOG(WARNING) << "couldn't get file system type information for '"
<< output_base.AsPrintablePath()
<< "': " << strerror(errno);
return;
}
if (strcmp(buf.f_fstypename, "nfs") == 0) {
BAZEL_LOG(WARNING) << "Output base '" << output_base.AsPrintablePath()
<< "' is on NFS. This may lead to surprising failures "
"and undetermined behavior.";
}
}
string GetSelfPath(const char* argv0) {
#if defined(__FreeBSD__)
char buffer[PATH_MAX] = {};
auto pid = getpid();
if (kill(pid, 0) < 0) return "";
auto procstat = procstat_open_sysctl();
unsigned int n;
auto p = procstat_getprocs(procstat, KERN_PROC_PID, pid, &n);
if (p) {
if (n != 1) {
BAZEL_DIE(blaze_exit_code::INTERNAL_ERROR)
<< "expected exactly one process from procstat_getprocs, got " << n
<< ": " << GetLastErrorString();
}
auto r = procstat_getpathname(procstat, p, buffer, PATH_MAX);
if (r != 0) {
BAZEL_DIE(blaze_exit_code::INTERNAL_ERROR)
<< "procstat_getpathname failed: " << GetLastErrorString();
}
procstat_freeprocs(procstat, p);
}
procstat_close(procstat);
return string(buffer);
#elif defined(__OpenBSD__)
// OpenBSD does not provide a way for a running process to find a path to its
// own executable, so we try to figure out a path by inspecting argv[0]. In
// theory this is inadequate, since the parent process can set argv[0] to
// anything, but in practice this is good enough.
const std::string argv0str(argv0);
// If argv[0] starts with a slash, it's an absolute path. Use it.
if (argv0str.length() > 0 && argv0str[0] == '/') {
return argv0str;
}
// Otherwise, if argv[0] contains a slash, then it's a relative path. Prepend
// the current directory to form an absolute path.
if (argv0str.length() > 0 && argv0str.find('/') != std::string::npos) {
return blaze_util::GetCwd() + "/" + argv0str;
}
// Otherwise, try to find the executable by searching the PATH.
const std::string from_search_path = Which(argv0);
if (!from_search_path.empty()) {
return from_search_path;
}
// None of the above worked. Give up.
BAZEL_DIE(blaze_exit_code::BAD_ARGV)
<< "Unable to determine the location of this Bazel executable.";
return ""; // Never executed. Needed so compiler does not complain.
#else
# error This BSD is not supported
#endif
}
uint64_t GetMillisecondsMonotonic() {
struct timespec ts = {};
if (clock_gettime(CLOCK_MONOTONIC, &ts)) {
BAZEL_DIE(blaze_exit_code::INTERNAL_ERROR)
<< "error calling clock_gettime: " << GetLastErrorString();
}
return ts.tv_sec * 1000LL + (ts.tv_nsec / 1000000LL);
}
void SetScheduling(bool batch_cpu_scheduling, int io_nice_level) {
// Stubbed out so we can compile.
}
std::unique_ptr<blaze_util::Path> GetProcessCWD(int pid) {
#if defined(HAVE_PROCSTAT)
if (kill(pid, 0) < 0) {
return nullptr;
}
auto procstat = procstat_open_sysctl();
unsigned int n;
auto p = procstat_getprocs(procstat, KERN_PROC_PID, pid, &n);
string cwd;
if (p) {
if (n != 1) {
BAZEL_DIE(blaze_exit_code::INTERNAL_ERROR)
<< "expected exactly one process from procstat_getprocs, got " << n
<< ": " << GetLastErrorString();
}
auto files = procstat_getfiles(procstat, p, false);
filestat *entry;
STAILQ_FOREACH(entry, files, next) {
if (entry->fs_uflags & PS_FST_UFLAG_CDIR) {
if (entry->fs_path) {
cwd = entry->fs_path;
} else {
cwd = "";
}
}
}
procstat_freefiles(procstat, files);
procstat_freeprocs(procstat, p);
}
procstat_close(procstat);
return std::unique_ptr<blaze_util::Path>(new blaze_util::Path(cwd));
#else
return nullptr;
#endif
}
bool IsSharedLibrary(const string &filename) {
return blaze_util::ends_with(filename, ".so");
}
string GetSystemJavabase() {
// If JAVA_HOME is defined, then use it as default.
string javahome = GetPathEnv("JAVA_HOME");
if (!javahome.empty()) {
string javac = blaze_util::JoinPath(javahome, "bin/javac");
if (access(javac.c_str(), X_OK) == 0) {
return javahome;
}
BAZEL_LOG(WARNING)
<< "Ignoring JAVA_HOME, because it must point to a JDK, not a JRE.";
}
return DEFAULT_SYSTEM_JAVABASE;
}
int ConfigureDaemonProcess(posix_spawnattr_t *attrp,
const StartupOptions &options) {
// No interesting platform-specific details to configure on this platform.
return 0;
}
void WriteSystemSpecificProcessIdentifier(const blaze_util::Path &server_dir,
pid_t server_pid) {}
bool VerifyServerProcess(int pid, const blaze_util::Path &output_base) {
// TODO(lberki): This only checks for the process's existence, not whether
// its start time matches. Therefore this might accidentally kill an
// unrelated process if the server died and the PID got reused.
return killpg(pid, 0) == 0;
}
// Not supported.
void ExcludePathFromBackup(const blaze_util::Path &path) {}
int32_t GetExplicitSystemLimit(const int resource) {
return -1;
}
} // namespace blaze