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/*
* Copyright (C) 2018 The Android Open Source Project
*
* 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 "common/libs/utils/environment.h"
#include <cstdio>
#include <cstdlib>
#include <memory>
#include <optional>
#include <ostream>
#include <string>
#include <android-base/logging.h>
#include <android-base/strings.h>
#include "common/libs/utils/files.h"
namespace cuttlefish {
std::optional<std::string> StringFromEnv(const std::string& varname) {
const char* const valstr = getenv(varname.c_str());
if (!valstr) {
return std::nullopt;
}
return valstr;
}
std::string StringFromEnv(const std::string& varname,
const std::string& defval) {
return StringFromEnv(varname).value_or(defval);
}
/**
* at runtime, return the arch of the host: e.g. aarch64, x86_64, etc
*
* uses "`which uname` -m"
*
* @return arch string on success, "" on failure
*/
std::string HostArchStr() {
static std::string arch;
if (!arch.empty()) {
return arch;
}
// good to check if uname exists and is executable
// or, guarantee uname is available by dependency list
FILE* pip = popen("uname -m", "r");
if (!pip) {
return std::string{};
}
auto read_from_file =
[](FILE* fp, size_t len) {
/*
* to see if input is longer than len,
* we read up to len+1. If the length is len+1,
* then the input is too long
*/
decltype(len) upper = len + 1;
std::string format("%");
format.append(std::to_string(upper)).append("s");
// 1 extra character needed for the terminating null
// character added by fscanf.
std::shared_ptr<char> buf(new char[upper + 1],
std::default_delete<char[]>());
if (fscanf(fp, format.c_str(), buf.get()) == EOF) {
return std::string{};
}
std::string result(buf.get());
return (result.length() < upper) ? result : std::string{};
};
arch = android::base::Trim(std::string_view{read_from_file(pip, 20)});
pclose(pip);
return arch;
}
Arch HostArch() {
std::string arch_str = HostArchStr();
if (arch_str == "aarch64" || arch_str == "arm64") {
return Arch::Arm64;
} else if (arch_str == "arm") {
return Arch::Arm;
} else if (arch_str == "riscv64") {
return Arch::RiscV64;
} else if (arch_str == "x86_64") {
return Arch::X86_64;
} else if (arch_str.size() == 4 && arch_str[0] == 'i' && arch_str[2] == '8' &&
arch_str[3] == '6') {
return Arch::X86;
} else {
LOG(FATAL) << "Unknown host architecture: " << arch_str;
return Arch::X86;
}
}
bool IsHostCompatible(Arch arch) {
Arch host_arch = HostArch();
return arch == host_arch || (arch == Arch::Arm && host_arch == Arch::Arm64) ||
(arch == Arch::X86 && host_arch == Arch::X86_64);
}
static bool IsRunningInDocker() {
// if /.dockerenv exists, it's inside a docker container
static std::string docker_env_path("/.dockerenv");
static bool ret =
FileExists(docker_env_path) || DirectoryExists(docker_env_path);
return ret;
}
bool IsRunningInContainer() {
// TODO: add more if we support other containers than docker
return IsRunningInDocker();
}
} // namespace cuttlefish
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