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// Copyright 2017 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/tools/process-wrapper-options.h"
#include <getopt.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <memory>
#include <string>
#include <vector>
#include "src/main/tools/logging.h"
struct Options opt;
// Print out a usage error. argc and argv are the argument counter and vector,
// fmt is a format, string for the error message to print.
static void Usage(char *program_name, const char *fmt, ...) {
va_list ap;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
fprintf(stderr, "\nUsage: %s -- command arg1 @args\n", program_name);
fprintf(
stderr,
"\nPossible arguments:\n"
" -t/--timeout <timeout> timeout after which the child process will be "
"terminated with SIGTERM\n"
" -k/--kill_delay <timeout> in case timeout occurs, how long to wait "
"before killing the child with SIGKILL\n"
" -o/--stdout <file> redirect stdout to a file\n"
" -e/--stderr <file> redirect stderr to a file\n"
" -s/--stats <file> if set, write stats in protobuf format to a file\n"
" -d/--debug if set, debug info will be printed\n"
" -- command to run inside sandbox, followed by arguments\n");
exit(EXIT_FAILURE);
}
// Parses command line flags from an argv array and puts the results into the
// global `opt` struct.
static void ParseCommandLine(const std::vector<char *> &args) {
static struct option long_options[] = {
{"timeout", required_argument, 0, 't'},
{"kill_delay", required_argument, 0, 'k'},
{"stdout", required_argument, 0, 'o'},
{"stderr", required_argument, 0, 'e'},
{"stats", required_argument, 0, 's'},
{"debug", no_argument, 0, 'd'},
{0, 0, 0, 0}};
extern char *optarg;
extern int optind, optopt;
int c;
while ((c = getopt_long(args.size(), args.data(), "+:t:k:o:e:s:d",
long_options, nullptr)) != -1) {
switch (c) {
case 't':
if (sscanf(optarg, "%lf", &opt.timeout_secs) != 1) {
Usage(args.front(), "Invalid timeout (-t) value: %s", optarg);
}
break;
case 'k':
if (sscanf(optarg, "%lf", &opt.kill_delay_secs) != 1) {
Usage(args.front(), "Invalid kill delay (-k) value: %s", optarg);
}
break;
case 'o':
if (opt.stdout_path.empty()) {
opt.stdout_path.assign(optarg);
} else {
Usage(args.front(),
"Cannot redirect stdout (-o) to more than one destination.");
}
break;
case 'e':
if (opt.stderr_path.empty()) {
opt.stderr_path.assign(optarg);
} else {
Usage(args.front(),
"Cannot redirect stderr (-e) to more than one destination.");
}
break;
case 's':
if (opt.stats_path.empty()) {
opt.stats_path.assign(optarg);
} else {
Usage(args.front(),
"Cannot write stats (-s) to more than one destination.");
}
break;
case 'd':
opt.debug = true;
break;
case '?':
Usage(args.front(), "Unrecognized argument: -%c (%d)", optopt, optind);
break;
case ':':
Usage(args.front(), "Flag -%c requires an argument", optopt);
break;
}
}
if (optind < static_cast<int>(args.size())) {
opt.args.assign(args.begin() + optind, args.end());
}
}
void ParseOptions(int argc, char *argv[]) {
std::vector<char *> args(argv, argv + argc);
ParseCommandLine(args);
if (opt.args.empty()) {
Usage(args.front(), "No command specified.");
}
// argv[] passed to execve() must be a null-terminated array.
opt.args.push_back(nullptr);
}
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