1 /*
2 * Copyright (C) 2018 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <inttypes.h>
18 #include <limits.h>
19 #include <stdio.h>
20 #include <stdint.h>
21 #include <stdlib.h>
22 #include <sys/types.h>
23 #include <sys/stat.h>
24 #include <sys/wait.h>
25 #include <fcntl.h>
26 #include <unistd.h>
27 #include <signal.h>
28
29 #include <algorithm>
30 #include <cstdlib>
31 #include <fstream>
32 #include <iomanip>
33 #include <memory>
34 #include <sstream>
35 #include <string>
36 #include <vector>
37
38 #include <gflags/gflags.h>
39 #include <android-base/logging.h>
40
41 #include "common/libs/fs/shared_fd.h"
42 #include "common/libs/fs/shared_select.h"
43 #include "common/libs/utils/environment.h"
44 #include "host/commands/run_cvd/runner_defs.h"
45 #include "host/libs/config/cuttlefish_config.h"
46 #include "host/libs/vm_manager/vm_manager.h"
47
48 DEFINE_int32(instance_num, cuttlefish::GetInstance(),
49 "Which instance to powerwash");
50
51 DEFINE_int32(wait_for_launcher, 5,
52 "How many seconds to wait for the launcher to respond to the status "
53 "command. A value of zero means wait indefinetly");
54
main(int argc,char ** argv)55 int main(int argc, char** argv) {
56 ::android::base::InitLogging(argv, android::base::StderrLogger);
57 google::ParseCommandLineFlags(&argc, &argv, true);
58
59 auto config = cuttlefish::CuttlefishConfig::Get();
60 if (!config) {
61 LOG(ERROR) << "Failed to obtain config object";
62 return 1;
63 }
64
65 auto instance = config->ForInstance(FLAGS_instance_num);
66 auto monitor_path = instance.launcher_monitor_socket_path();
67 if (monitor_path.empty()) {
68 LOG(ERROR) << "No path to launcher monitor found";
69 return 2;
70 }
71 auto monitor_socket = cuttlefish::SharedFD::SocketLocalClient(monitor_path.c_str(),
72 false, SOCK_STREAM);
73 if (!monitor_socket->IsOpen()) {
74 LOG(ERROR) << "Unable to connect to launcher monitor at " << monitor_path
75 << ": " << monitor_socket->StrError();
76 return 3;
77 }
78 auto request = cuttlefish::LauncherAction::kPowerwash;
79 auto bytes_sent = monitor_socket->Send(&request, sizeof(request), 0);
80 if (bytes_sent < 0) {
81 LOG(ERROR) << "Error sending launcher monitor the status command: "
82 << monitor_socket->StrError();
83 return 4;
84 }
85 // Perform a select with a timeout to guard against launcher hanging
86 cuttlefish::SharedFDSet read_set;
87 read_set.Set(monitor_socket);
88 struct timeval timeout = {FLAGS_wait_for_launcher, 0};
89 int selected = cuttlefish::Select(&read_set, nullptr, nullptr,
90 FLAGS_wait_for_launcher <= 0 ? nullptr : &timeout);
91 if (selected < 0){
92 LOG(ERROR) << "Failed communication with the launcher monitor: "
93 << strerror(errno);
94 return 5;
95 }
96 if (selected == 0) {
97 LOG(ERROR) << "Timeout expired waiting for launcher monitor to respond";
98 return 6;
99 }
100 cuttlefish::LauncherResponse response;
101 auto bytes_recv = monitor_socket->Recv(&response, sizeof(response), 0);
102 if (bytes_recv < 0) {
103 LOG(ERROR) << "Error receiving response from launcher monitor: "
104 << monitor_socket->StrError();
105 return 7;
106 }
107 if (response != cuttlefish::LauncherResponse::kSuccess) {
108 LOG(ERROR) << "Received '" << static_cast<char>(response)
109 << "' response from launcher monitor";
110 return 8;
111 }
112 bytes_recv = monitor_socket->Recv(&response, sizeof(response), 0);
113 if (bytes_recv != 0) {
114 LOG(ERROR) << "execv must have failed in the launcher.";
115 if (bytes_recv < 0) {
116 LOG(ERROR) << monitor_socket->StrError();
117 }
118 return 9;
119 }
120 LOG(INFO) << "Powerwash successful";
121 return 0;
122 }
123