1 //
2 // Copyright (C) 2020 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 #include <android-base/logging.h>
17 #include <android-base/strings.h>
18 #include <gflags/gflags.h>
19
20 #include "common/libs/fs/shared_fd.h"
21 #include "common/libs/utils/tee_logging.h"
22 #include "host/libs/config/cuttlefish_config.h"
23
24 DEFINE_string(process_name, "", "The process to credit log messages to");
25 DEFINE_int32(log_fd_in, -1, "The file descriptor to read logs from.");
26
main(int argc,char ** argv)27 int main(int argc, char** argv) {
28 ::android::base::InitLogging(argv, android::base::StderrLogger);
29 google::ParseCommandLineFlags(&argc, &argv, /* remove_flags */ true);
30
31 CHECK(FLAGS_log_fd_in >= 0) << "-log_fd_in is required";
32
33 auto config = cuttlefish::CuttlefishConfig::Get();
34
35 CHECK(config) << "Could not open cuttlefish config";
36
37 auto instance = config->ForDefaultInstance();
38
39 if (config->run_as_daemon()) {
40 android::base::SetLogger(
41 cuttlefish::LogToFiles({instance.launcher_log_path()}));
42 } else {
43 android::base::SetLogger(
44 cuttlefish::LogToStderrAndFiles({instance.launcher_log_path()}));
45 }
46
47 auto log_fd = cuttlefish::SharedFD::Dup(FLAGS_log_fd_in);
48 CHECK(log_fd->IsOpen()) << "Failed to dup log_fd_in: " << log_fd->StrError();
49 close(FLAGS_log_fd_in);
50
51 if (FLAGS_process_name.size() > 0) {
52 android::base::SetDefaultTag(FLAGS_process_name);
53 }
54
55 char buf[1 << 16];
56 ssize_t chars_read = 0;
57
58 LOG(DEBUG) << "Starting to read from process " << FLAGS_process_name;
59
60 while ((chars_read = log_fd->Read(buf, sizeof(buf))) > 0) {
61 auto trimmed = android::base::Trim(std::string(buf, chars_read));
62 // Newlines inside `trimmed` are handled by the android logging code.
63 // These checks attempt to determine the log severity coming from crosvm.
64 // There is no guarantee of success all the time since log line boundaries
65 // could be out sync with the reads, but that's ok.
66 if (android::base::StartsWith(trimmed, "[INFO")) {
67 LOG(INFO) << trimmed;
68 } else if (android::base::StartsWith(trimmed, "[ERROR")) {
69 LOG(ERROR) << trimmed;
70 } else if (android::base::StartsWith(trimmed, "[WARNING")) {
71 LOG(WARNING) << trimmed;
72 } else if (android::base::StartsWith(trimmed, "[VERBOSE")) {
73 LOG(VERBOSE) << trimmed;
74 } else {
75 LOG(DEBUG) << trimmed;
76 }
77 }
78
79 if (chars_read < 0) {
80 LOG(DEBUG) << "Failed to read from process " << FLAGS_process_name << ": "
81 << log_fd->StrError();
82 }
83
84 LOG(DEBUG) << "Finished reading from process " << FLAGS_process_name;
85 }
86