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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 https://llvm.org/LICENSE.txt 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 =
+ VFS.getBufferForFile("/etc/os-release");
+ 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("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)
+ .Default(Distro::UnknownDistro);
+ return Version;
+}
+
+static Distro::DistroType DetectLsbRelease(llvm::vfs::FileSystem &VFS) {
+ llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> File =
+ VFS.getBufferForFile("/etc/lsb-release");
+ 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 &&
+ Line.startswith("DISTRIB_CODENAME="))
+ 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)
+ .Default(Distro::UnknownDistro);
+ return Version;
+}
+
+static Distro::DistroType DetectDistro(llvm::vfs::FileSystem &VFS) {
+ Distro::DistroType Version = Distro::UnknownDistro;
+
+ // Newer freedesktop.org'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 =
+ VFS.getBufferForFile("/etc/redhat-release");
+
+ 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.find("release 7") != StringRef::npos)
+ return Distro::RHEL7;
+ else if (Data.find("release 6") != StringRef::npos)
+ return Distro::RHEL6;
+ else if (Data.find("release 5") != StringRef::npos)
+ 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;
+ default:
+ 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)
+ .Default(Distro::UnknownDistro);
+ }
+
+ // ...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"))
+ continue;
+ 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 =
+ SplitLine.second.trim().split('.');
+ 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/exherbo-release"))
+ return Distro::Exherbo;
+
+ if (VFS.exists("/etc/alpine-release"))
+ return Distro::AlpineLinux;
+
+ if (VFS.exists("/etc/arch-release"))
+ return Distro::ArchLinux;
+
+ 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)) {}
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-10 17:03:29 +0000