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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.
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include "src/tools/launcher/launcher.h"
#include <windows.h>
#include <algorithm>
#include <fstream>
#include <iostream>
#include <sstream>
#include <string>
#include <vector>
#include "src/main/cpp/util/path_platform.h"
#include "src/main/cpp/util/strings.h"
#include "src/tools/launcher/util/data_parser.h"
#include "src/tools/launcher/util/launcher_util.h"
namespace bazel {
namespace launcher {
using std::ifstream;
using std::string;
using std::unordered_map;
using std::vector;
using std::wostringstream;
using std::wstring;
static wstring GetRunfilesDir(const wchar_t* argv0) {
wstring runfiles_dir;
// If RUNFILES_DIR is already set (probably we are either in a test or in a
// data dependency) then use it.
if (GetEnv(L"RUNFILES_DIR", &runfiles_dir)) {
return runfiles_dir;
}
// Otherwise this is probably a top-level non-test binary (e.g. a genrule
// tool) and should look for its runfiles beside the executable.
return GetBinaryPathWithExtension(argv0) + L".runfiles";
}
BinaryLauncherBase::BinaryLauncherBase(
const LaunchDataParser::LaunchInfo& _launch_info, int argc, wchar_t* argv[])
: launch_info(_launch_info),
manifest_file(FindManifestFile(argv[0])),
runfiles_dir(GetRunfilesDir(argv[0])),
workspace_name(GetLaunchInfoByKey(WORKSPACE_NAME)),
symlink_runfiles_enabled(GetLaunchInfoByKey(SYMLINK_RUNFILES_ENABLED) ==
L"1") {
for (int i = 0; i < argc; i++) {
commandline_arguments.push_back(argv[i]);
}
// Prefer to use the runfiles manifest, if it exists, but otherwise the
// runfiles directory will be used by default. On Windows, the manifest is
// used locally, and the runfiles directory is used remotely.
if (!manifest_file.empty()) {
ParseManifestFile(&manifest_file_map, manifest_file);
}
}
static bool FindManifestFileImpl(const wchar_t* argv0, wstring* result) {
// If this binary X runs as the data-dependency of some other binary Y, then
// X has no runfiles manifest/directory and should use Y's.
if (GetEnv(L"RUNFILES_MANIFEST_FILE", result) &&
DoesFilePathExist(result->c_str())) {
return true;
}
wstring directory;
if (GetEnv(L"RUNFILES_DIR", &directory)) {
*result = directory + L"/MANIFEST";
if (DoesFilePathExist(result->c_str())) {
return true;
}
}
// If this binary X runs by itself (not as a data-dependency of another
// binary), then look for the manifest in a runfiles directory next to the
// main binary, then look for it (the manifest) next to the main binary.
directory = GetBinaryPathWithExtension(argv0) + L".runfiles";
*result = directory + L"/MANIFEST";
if (DoesFilePathExist(result->c_str())) {
return true;
}
*result = directory + L"_manifest";
if (DoesFilePathExist(result->c_str())) {
return true;
}
return false;
}
wstring BinaryLauncherBase::FindManifestFile(const wchar_t* argv0) {
wstring manifest_file;
if (!FindManifestFileImpl(argv0, &manifest_file)) {
return L"";
}
// The path will be set as the RUNFILES_MANIFEST_FILE envvar and used by the
// shell script, so let's convert backslashes to forward slashes.
std::replace(manifest_file.begin(), manifest_file.end(), '\\', '/');
return manifest_file;
}
wstring BinaryLauncherBase::GetRunfilesPath() const {
wstring runfiles_path =
GetBinaryPathWithExtension(this->commandline_arguments[0]) + L".runfiles";
std::replace(runfiles_path.begin(), runfiles_path.end(), L'/', L'\\');
return runfiles_path;
}
void BinaryLauncherBase::ParseManifestFile(ManifestFileMap* manifest_file_map,
const wstring& manifest_path) {
ifstream manifest_file(AsAbsoluteWindowsPath(manifest_path.c_str()).c_str());
if (!manifest_file) {
die(L"Couldn't open MANIFEST file: %s", manifest_path.c_str());
}
string line;
while (getline(manifest_file, line)) {
size_t space_pos = line.find_first_of(' ');
if (space_pos == string::npos) {
die(L"Wrong MANIFEST format at line: %s", line.c_str());
}
wstring wline = blaze_util::CstringToWstring(line);
wstring key = wline.substr(0, space_pos);
wstring value = wline.substr(space_pos + 1);
manifest_file_map->insert(make_pair(key, value));
}
}
wstring BinaryLauncherBase::Rlocation(wstring path,
bool has_workspace_name) const {
// No need to do rlocation if the path is absolute.
if (blaze_util::IsAbsolute(path)) {
return path;
}
if (path.find(L"external/") == 0) {
// Ignore 'has_workspace_name' when the path is under "external/". Such
// paths already have a workspace name in the next path component.
path = path.substr(9);
} else if (!has_workspace_name) {
path = this->workspace_name + L"/" + path;
}
// If the manifest file map is empty, then we're using the runfiles directory
// instead.
if (manifest_file_map.empty()) {
return runfiles_dir + L"/" + path;
}
auto entry = manifest_file_map.find(path);
if (entry == manifest_file_map.end()) {
die(L"Rlocation failed on %s, path doesn't exist in MANIFEST file",
path.c_str());
}
return entry->second;
}
wstring BinaryLauncherBase::GetLaunchInfoByKey(const string& key) {
auto item = launch_info.find(key);
if (item == launch_info.end()) {
die(L"Cannot find key \"%hs\" from launch data.\n", key.c_str());
}
return item->second;
}
const vector<wstring>& BinaryLauncherBase::GetCommandlineArguments() const {
return this->commandline_arguments;
}
void BinaryLauncherBase::CreateCommandLine(
CmdLine* result, const wstring& executable,
const vector<wstring>& arguments) const {
wostringstream cmdline;
cmdline << L'\"' << executable << L'\"';
for (const auto& s : arguments) {
cmdline << L' ' << s;
}
wstring cmdline_str = cmdline.str();
if (cmdline_str.size() >= MAX_CMDLINE_LENGTH) {
die(L"Command line too long: %s", cmdline_str.c_str());
}
// Copy command line into a mutable buffer.
// CreateProcess is allowed to mutate its command line argument.
wcsncpy(result->cmdline, cmdline_str.c_str(), MAX_CMDLINE_LENGTH - 1);
result->cmdline[MAX_CMDLINE_LENGTH - 1] = 0;
}
bool BinaryLauncherBase::PrintLauncherCommandLine(
const wstring& executable, const vector<wstring>& arguments) const {
bool has_print_cmd_flag = false;
for (const auto& arg : arguments) {
has_print_cmd_flag |= (arg == L"--print_launcher_command");
}
if (has_print_cmd_flag) {
wprintf(L"%s\n", executable.c_str());
for (const auto& arg : arguments) {
wprintf(L"%s\n", arg.c_str());
}
}
return has_print_cmd_flag;
}
ExitCode BinaryLauncherBase::LaunchProcess(const wstring& executable,
const vector<wstring>& arguments,
bool suppressOutput) const {
if (PrintLauncherCommandLine(executable, arguments)) {
return 0;
}
// Set RUNFILES_DIR if:
// 1. Symlink runfiles tree is enabled, or
// 2. We couldn't find manifest file (which probably means we are running
// remotely).
// Otherwise, set RUNFILES_MANIFEST_ONLY and RUNFILES_MANIFEST_FILE
if (symlink_runfiles_enabled || manifest_file.empty()) {
SetEnv(L"RUNFILES_DIR", runfiles_dir);
} else {
SetEnv(L"RUNFILES_MANIFEST_ONLY", L"1");
SetEnv(L"RUNFILES_MANIFEST_FILE", manifest_file);
}
CmdLine cmdline;
CreateCommandLine(&cmdline, executable, arguments);
PROCESS_INFORMATION processInfo = {0};
STARTUPINFOW startupInfo = {0};
startupInfo.cb = sizeof(startupInfo);
BOOL ok = CreateProcessW(
/* lpApplicationName */ NULL,
/* lpCommandLine */ cmdline.cmdline,
/* lpProcessAttributes */ NULL,
/* lpThreadAttributes */ NULL,
/* bInheritHandles */ FALSE,
/* dwCreationFlags */
suppressOutput ? CREATE_NO_WINDOW // no console window => no output
: 0,
/* lpEnvironment */ NULL,
/* lpCurrentDirectory */ NULL,
/* lpStartupInfo */ &startupInfo,
/* lpProcessInformation */ &processInfo);
if (!ok) {
PrintError(L"Cannot launch process: %s\nReason: %hs", cmdline.cmdline,
GetLastErrorString().c_str());
return GetLastError();
}
WaitForSingleObject(processInfo.hProcess, INFINITE);
ExitCode exit_code;
GetExitCodeProcess(processInfo.hProcess,
reinterpret_cast<LPDWORD>(&exit_code));
CloseHandle(processInfo.hProcess);
CloseHandle(processInfo.hThread);
return exit_code;
}
} // namespace launcher
} // namespace bazel