1 //===--- Distro.cpp - Linux distribution detection support ------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "clang/Driver/Distro.h" 10 #include "clang/Basic/LLVM.h" 11 #include "llvm/ADT/SmallVector.h" 12 #include "llvm/ADT/StringRef.h" 13 #include "llvm/ADT/StringSwitch.h" 14 #include "llvm/Support/ErrorOr.h" 15 #include "llvm/Support/MemoryBuffer.h" 16 #include "llvm/ADT/Triple.h" 17 18 using namespace clang::driver; 19 using namespace clang; 20 21 static Distro::DistroType DetectDistro(llvm::vfs::FileSystem &VFS, 22 const llvm::Triple &TargetOrHost) { 23 // If we don't target Linux, no need to check the distro. This saves a few 24 // OS calls. 25 if (!TargetOrHost.isOSLinux()) 26 return Distro::UnknownDistro; 27 28 // If the host is not running Linux, and we're backed by a real file system, 29 // no need to check the distro. This is the case where someone is 30 // cross-compiling from BSD or Windows to Linux, and it would be meaningless 31 // to try to figure out the "distro" of the non-Linux host. 32 IntrusiveRefCntPtr<llvm::vfs::FileSystem> RealFS = 33 llvm::vfs::getRealFileSystem(); 34 llvm::Triple HostTriple(llvm::sys::getProcessTriple()); 35 if (!HostTriple.isOSLinux() && &VFS == RealFS.get()) 36 return Distro::UnknownDistro; 37 38 llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> File = 39 VFS.getBufferForFile("/etc/lsb-release"); 40 if (File) { 41 StringRef Data = File.get()->getBuffer(); 42 SmallVector<StringRef, 16> Lines; 43 Data.split(Lines, "\n"); 44 Distro::DistroType Version = Distro::UnknownDistro; 45 for (StringRef Line : Lines) 46 if (Version == Distro::UnknownDistro && Line.startswith("DISTRIB_CODENAME=")) 47 Version = llvm::StringSwitch<Distro::DistroType>(Line.substr(17)) 48 .Case("hardy", Distro::UbuntuHardy) 49 .Case("intrepid", Distro::UbuntuIntrepid) 50 .Case("jaunty", Distro::UbuntuJaunty) 51 .Case("karmic", Distro::UbuntuKarmic) 52 .Case("lucid", Distro::UbuntuLucid) 53 .Case("maverick", Distro::UbuntuMaverick) 54 .Case("natty", Distro::UbuntuNatty) 55 .Case("oneiric", Distro::UbuntuOneiric) 56 .Case("precise", Distro::UbuntuPrecise) 57 .Case("quantal", Distro::UbuntuQuantal) 58 .Case("raring", Distro::UbuntuRaring) 59 .Case("saucy", Distro::UbuntuSaucy) 60 .Case("trusty", Distro::UbuntuTrusty) 61 .Case("utopic", Distro::UbuntuUtopic) 62 .Case("vivid", Distro::UbuntuVivid) 63 .Case("wily", Distro::UbuntuWily) 64 .Case("xenial", Distro::UbuntuXenial) 65 .Case("yakkety", Distro::UbuntuYakkety) 66 .Case("zesty", Distro::UbuntuZesty) 67 .Case("artful", Distro::UbuntuArtful) 68 .Case("bionic", Distro::UbuntuBionic) 69 .Case("cosmic", Distro::UbuntuCosmic) 70 .Case("disco", Distro::UbuntuDisco) 71 .Case("eoan", Distro::UbuntuEoan) 72 .Case("focal", Distro::UbuntuFocal) 73 .Default(Distro::UnknownDistro); 74 if (Version != Distro::UnknownDistro) 75 return Version; 76 } 77 78 File = VFS.getBufferForFile("/etc/redhat-release"); 79 if (File) { 80 StringRef Data = File.get()->getBuffer(); 81 if (Data.startswith("Fedora release")) 82 return Distro::Fedora; 83 if (Data.startswith("Red Hat Enterprise Linux") || 84 Data.startswith("CentOS") || 85 Data.startswith("Scientific Linux")) { 86 if (Data.find("release 7") != StringRef::npos) 87 return Distro::RHEL7; 88 else if (Data.find("release 6") != StringRef::npos) 89 return Distro::RHEL6; 90 else if (Data.find("release 5") != StringRef::npos) 91 return Distro::RHEL5; 92 } 93 return Distro::UnknownDistro; 94 } 95 96 File = VFS.getBufferForFile("/etc/debian_version"); 97 if (File) { 98 StringRef Data = File.get()->getBuffer(); 99 // Contents: < major.minor > or < codename/sid > 100 int MajorVersion; 101 if (!Data.split('.').first.getAsInteger(10, MajorVersion)) { 102 switch (MajorVersion) { 103 case 5: 104 return Distro::DebianLenny; 105 case 6: 106 return Distro::DebianSqueeze; 107 case 7: 108 return Distro::DebianWheezy; 109 case 8: 110 return Distro::DebianJessie; 111 case 9: 112 return Distro::DebianStretch; 113 case 10: 114 return Distro::DebianBuster; 115 case 11: 116 return Distro::DebianBullseye; 117 default: 118 return Distro::UnknownDistro; 119 } 120 } 121 return llvm::StringSwitch<Distro::DistroType>(Data.split("\n").first) 122 .Case("squeeze/sid", Distro::DebianSqueeze) 123 .Case("wheezy/sid", Distro::DebianWheezy) 124 .Case("jessie/sid", Distro::DebianJessie) 125 .Case("stretch/sid", Distro::DebianStretch) 126 .Case("buster/sid", Distro::DebianBuster) 127 .Case("bullseye/sid", Distro::DebianBullseye) 128 .Default(Distro::UnknownDistro); 129 } 130 131 File = VFS.getBufferForFile("/etc/SuSE-release"); 132 if (File) { 133 StringRef Data = File.get()->getBuffer(); 134 SmallVector<StringRef, 8> Lines; 135 Data.split(Lines, "\n"); 136 for (const StringRef& Line : Lines) { 137 if (!Line.trim().startswith("VERSION")) 138 continue; 139 std::pair<StringRef, StringRef> SplitLine = Line.split('='); 140 // Old versions have split VERSION and PATCHLEVEL 141 // Newer versions use VERSION = x.y 142 std::pair<StringRef, StringRef> SplitVer = SplitLine.second.trim().split('.'); 143 int Version; 144 145 // OpenSUSE/SLES 10 and older are not supported and not compatible 146 // with our rules, so just treat them as Distro::UnknownDistro. 147 if (!SplitVer.first.getAsInteger(10, Version) && Version > 10) 148 return Distro::OpenSUSE; 149 return Distro::UnknownDistro; 150 } 151 return Distro::UnknownDistro; 152 } 153 154 if (VFS.exists("/etc/exherbo-release")) 155 return Distro::Exherbo; 156 157 if (VFS.exists("/etc/alpine-release")) 158 return Distro::AlpineLinux; 159 160 if (VFS.exists("/etc/arch-release")) 161 return Distro::ArchLinux; 162 163 if (VFS.exists("/etc/gentoo-release")) 164 return Distro::Gentoo; 165 166 return Distro::UnknownDistro; 167 } 168 169 Distro::Distro(llvm::vfs::FileSystem &VFS, const llvm::Triple &TargetOrHost) 170 : DistroVal(DetectDistro(VFS, TargetOrHost)) {} 171