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//===--- Distro.cpp - Linux distribution detection support ------*- C++ -*-===//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#include "clang/Driver/Distro.h"
#include "clang/Basic/LLVM.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/ADT/Triple.h"
#include "llvm/Support/ErrorOr.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Threading.h"
using namespace clang::driver;
using namespace clang;
static Distro::DistroType DetectOsRelease(llvm::vfs::FileSystem &VFS) {
llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> File =
if (!File)
File = VFS.getBufferForFile("/usr/lib/os-release");
if (!File)
return Distro::UnknownDistro;
SmallVector<StringRef, 16> Lines;
File.get()->getBuffer().split(Lines, "\n");
Distro::DistroType Version = Distro::UnknownDistro;
// Obviously this can be improved a lot.
for (StringRef Line : Lines)
if (Version == Distro::UnknownDistro && Line.startswith("ID="))
Version = llvm::StringSwitch<Distro::DistroType>(Line.substr(3))
.Case("alpine", Distro::AlpineLinux)
.Case("fedora", Distro::Fedora)
.Case("gentoo", Distro::Gentoo)
.Case("arch", Distro::ArchLinux)
// On SLES, /etc/os-release was introduced in SLES 11.
.Case("sles", Distro::OpenSUSE)
.Case("opensuse", Distro::OpenSUSE)
.Case("exherbo", Distro::Exherbo)
return Version;
static Distro::DistroType DetectLsbRelease(llvm::vfs::FileSystem &VFS) {
llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> File =
if (!File)
return Distro::UnknownDistro;
SmallVector<StringRef, 16> Lines;
File.get()->getBuffer().split(Lines, "\n");
Distro::DistroType Version = Distro::UnknownDistro;
for (StringRef Line : Lines)
if (Version == Distro::UnknownDistro &&
Version = llvm::StringSwitch<Distro::DistroType>(Line.substr(17))
.Case("hardy", Distro::UbuntuHardy)
.Case("intrepid", Distro::UbuntuIntrepid)
.Case("jaunty", Distro::UbuntuJaunty)
.Case("karmic", Distro::UbuntuKarmic)
.Case("lucid", Distro::UbuntuLucid)
.Case("maverick", Distro::UbuntuMaverick)
.Case("natty", Distro::UbuntuNatty)
.Case("oneiric", Distro::UbuntuOneiric)
.Case("precise", Distro::UbuntuPrecise)
.Case("quantal", Distro::UbuntuQuantal)
.Case("raring", Distro::UbuntuRaring)
.Case("saucy", Distro::UbuntuSaucy)
.Case("trusty", Distro::UbuntuTrusty)
.Case("utopic", Distro::UbuntuUtopic)
.Case("vivid", Distro::UbuntuVivid)
.Case("wily", Distro::UbuntuWily)
.Case("xenial", Distro::UbuntuXenial)
.Case("yakkety", Distro::UbuntuYakkety)
.Case("zesty", Distro::UbuntuZesty)
.Case("artful", Distro::UbuntuArtful)
.Case("bionic", Distro::UbuntuBionic)
.Case("cosmic", Distro::UbuntuCosmic)
.Case("disco", Distro::UbuntuDisco)
.Case("eoan", Distro::UbuntuEoan)
.Case("focal", Distro::UbuntuFocal)
.Case("groovy", Distro::UbuntuGroovy)
.Case("hirsute", Distro::UbuntuHirsute)
.Case("impish", Distro::UbuntuImpish)
.Case("jammy", Distro::UbuntuJammy)
return Version;
static Distro::DistroType DetectDistro(llvm::vfs::FileSystem &VFS) {
Distro::DistroType Version = Distro::UnknownDistro;
// Newer's compilant systemd-based systems
// should provide /etc/os-release or /usr/lib/os-release.
Version = DetectOsRelease(VFS);
if (Version != Distro::UnknownDistro)
return Version;
// Older systems might provide /etc/lsb-release.
Version = DetectLsbRelease(VFS);
if (Version != Distro::UnknownDistro)
return Version;
// Otherwise try some distro-specific quirks for RedHat...
llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> File =
if (File) {
StringRef Data = File.get()->getBuffer();
if (Data.startswith("Fedora release"))
return Distro::Fedora;
if (Data.startswith("Red Hat Enterprise Linux") ||
Data.startswith("CentOS") || Data.startswith("Scientific Linux")) {
if (Data.contains("release 7"))
return Distro::RHEL7;
else if (Data.contains("release 6"))
return Distro::RHEL6;
else if (Data.contains("release 5"))
return Distro::RHEL5;
return Distro::UnknownDistro;
// ...for Debian
File = VFS.getBufferForFile("/etc/debian_version");
if (File) {
StringRef Data = File.get()->getBuffer();
// Contents: < major.minor > or < codename/sid >
int MajorVersion;
if (!Data.split('.').first.getAsInteger(10, MajorVersion)) {
switch (MajorVersion) {
case 5:
return Distro::DebianLenny;
case 6:
return Distro::DebianSqueeze;
case 7:
return Distro::DebianWheezy;
case 8:
return Distro::DebianJessie;
case 9:
return Distro::DebianStretch;
case 10:
return Distro::DebianBuster;
case 11:
return Distro::DebianBullseye;
case 12:
return Distro::DebianBookworm;
return Distro::UnknownDistro;
return llvm::StringSwitch<Distro::DistroType>(Data.split("\n").first)
.Case("squeeze/sid", Distro::DebianSqueeze)
.Case("wheezy/sid", Distro::DebianWheezy)
.Case("jessie/sid", Distro::DebianJessie)
.Case("stretch/sid", Distro::DebianStretch)
.Case("buster/sid", Distro::DebianBuster)
.Case("bullseye/sid", Distro::DebianBullseye)
.Case("bookworm/sid", Distro::DebianBookworm)
// ...for SUSE
File = VFS.getBufferForFile("/etc/SuSE-release");
if (File) {
StringRef Data = File.get()->getBuffer();
SmallVector<StringRef, 8> Lines;
Data.split(Lines, "\n");
for (const StringRef &Line : Lines) {
if (!Line.trim().startswith("VERSION"))
std::pair<StringRef, StringRef> SplitLine = Line.split('=');
// Old versions have split VERSION and PATCHLEVEL
// Newer versions use VERSION = x.y
std::pair<StringRef, StringRef> SplitVer =
int Version;
// OpenSUSE/SLES 10 and older are not supported and not compatible
// with our rules, so just treat them as Distro::UnknownDistro.
if (!SplitVer.first.getAsInteger(10, Version) && Version > 10)
return Distro::OpenSUSE;
return Distro::UnknownDistro;
return Distro::UnknownDistro;
// ...and others.
if (VFS.exists("/etc/gentoo-release"))
return Distro::Gentoo;
return Distro::UnknownDistro;
static Distro::DistroType GetDistro(llvm::vfs::FileSystem &VFS,
const llvm::Triple &TargetOrHost) {
// If we don't target Linux, no need to check the distro. This saves a few
// OS calls.
if (!TargetOrHost.isOSLinux())
return Distro::UnknownDistro;
// True if we're backed by a real file system.
const bool onRealFS = (llvm::vfs::getRealFileSystem() == &VFS);
// If the host is not running Linux, and we're backed by a real file
// system, no need to check the distro. This is the case where someone
// is cross-compiling from BSD or Windows to Linux, and it would be
// meaningless to try to figure out the "distro" of the non-Linux host.
llvm::Triple HostTriple(llvm::sys::getProcessTriple());
if (!HostTriple.isOSLinux() && onRealFS)
return Distro::UnknownDistro;
if (onRealFS) {
// If we're backed by a real file system, perform
// the detection only once and save the result.
static Distro::DistroType LinuxDistro = DetectDistro(VFS);
return LinuxDistro;
// This is mostly for passing tests which uses llvm::vfs::InMemoryFileSystem,
// which is not "real".
return DetectDistro(VFS);
Distro::Distro(llvm::vfs::FileSystem &VFS, const llvm::Triple &TargetOrHost)
: DistroVal(GetDistro(VFS, TargetOrHost)) {}