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