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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
#include "opentelemetry/resource_detectors/detail/container_detector_utils.h"
#include "opentelemetry/nostd/string_view.h"
#include <fstream>
#include <regex>
#include <string>
#include "opentelemetry/version.h"
OPENTELEMETRY_BEGIN_NAMESPACE
namespace resource_detector
{
namespace detail
{
std::string GetContainerIDFromCgroup(const char *file_path)
{
std::ifstream cgroup_file(file_path);
std::string line;
while (std::getline(cgroup_file, line))
{
std::string container_id = ExtractContainerIDFromLine(line);
if (!container_id.empty())
{
return container_id;
}
}
return std::string();
}
std::string ExtractContainerIDFromLine(nostd::string_view line)
{
/**
* This regex is designed to extract container IDs from cgroup file lines.
* It matches hexadecimal container IDs used by container runtimes like Docker, containerd, and
* cri-o.
* Examples of matching lines:
* - 0::/docker/3fae9b2c6d7e8f90123456789abcdef0123456789abcdef0123456789abcdef0
* - "13:name=systemd:/podruntime/docker/kubepods/ac679f8a8319c8cf7d38e1adf263bc08d23.aaaa"
* - "e857a4bf05a69080a759574949d7a0e69572e27647800fa7faff6a05a8332aa1"
* Please see the test cases in resource_test.cc for more examples.
*/
static const std::regex container_id_regex(R"(^.*/(?:.*[-:])?([0-9a-f]+)(?:\.|\s*$))");
std::match_results<const char *> match;
if (std::regex_search(line.data(), line.data() + line.size(), match, container_id_regex))
{
return match.str(1);
}
return std::string();
}
} // namespace detail
} // namespace resource_detector
OPENTELEMETRY_END_NAMESPACE
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