| //===--- 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("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) |
| .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/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)) {} |
