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/*
* Phusion Passenger - https://www.phusionpassenger.com/
* Copyright (c) 2018 Phusion Holding B.V.
*
* "Passenger", "Phusion Passenger" and "Union Station" are registered
* trademarks of Phusion Holding B.V.
*
* See LICENSE file for license information.
*/
#ifndef _PASSENGER_SYSTEM_TOOLS_CONTAINER_HELPERS_H_
#define _PASSENGER_SYSTEM_TOOLS_CONTAINER_HELPERS_H_
#include <unistd.h>
#include <boost/predef.h>
#include <FileTools/FileManip.h>
#include <StrIntTools/StrIntUtils.h>
namespace Passenger {
using namespace std;
// adapted from https://github.com/systemd/systemd/blob/042ca/src/basic/virt.c
// separate function to keep as similar to source as possible for easier updates
inline bool
_linuxAutoDetectInContainer() {
// https://github.com/moby/moby/issues/26102#issuecomment-253621560
if (fileExists("/.dockerenv")) {
return true;
}
if (fileExists("/proc/vz") && !fileExists("/proc/bc")) {
return true;
}
const char *env = getenv("container");
if (env != NULL) {
return (*env != '\0');
}
if (fileExists("/run/systemd/container")) {
string file = unsafeReadFile("/run/systemd/container");
return (file.length() > 0);
}
if (geteuid() == 0) {
if (fileExists("/proc/1/environ")) {
string file = unsafeReadFile("/proc/1/environ");
if (file.size() > 0) {
vector<string> v;
split(file,'\0', v);
for(vector<string>::iterator it = v.begin(); it != v.end(); ++it) {
if (startsWith(*it, "container=")) {
return true;
}
}
}
}
if (fileExists("/proc/1/sched")) {
string file = unsafeReadFile("/proc/1/sched");
if (file.length() > 0) {
const char t = file[0];
if (t == '\0') {
return false;
}
if (!startsWith(file, "(1,")) {
return true;
}
}
}
}
return false;
}
inline bool
autoDetectInContainer() {
#if BOOST_OS_LINUX
return _linuxAutoDetectInContainer();
#else
return false;
#endif
}
} // namespace Passenger
#endif /* _PASSENGER_SYSTEM_TOOLS_CONTAINER_HELPERS_H_ */
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