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/ADT/Triple.h" 15 #include "llvm/Support/ErrorOr.h" 16 #include "llvm/Support/Host.h" 17 #include "llvm/Support/MemoryBuffer.h" 18 #include "llvm/Support/Threading.h" 19 20 using namespace clang::driver; 21 using namespace clang; 22 23 static Distro::DistroType DetectOsRelease(llvm::vfs::FileSystem &VFS) { 24 llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> File = 25 VFS.getBufferForFile("/etc/os-release"); 26 if (!File) 27 File = VFS.getBufferForFile("/usr/lib/os-release"); 28 if (!File) 29 return Distro::UnknownDistro; 30 31 SmallVector<StringRef, 16> Lines; 32 File.get()->getBuffer().split(Lines, "\n"); 33 Distro::DistroType Version = Distro::UnknownDistro; 34 35 // Obviously this can be improved a lot. 36 for (StringRef Line : Lines) 37 if (Version == Distro::UnknownDistro && Line.startswith("ID=")) 38 Version = llvm::StringSwitch<Distro::DistroType>(Line.substr(3)) 39 .Case("fedora", Distro::Fedora) 40 .Case("gentoo", Distro::Gentoo) 41 .Case("arch", Distro::ArchLinux) 42 // On SLES, /etc/os-release was introduced in SLES 11. 43 .Case("sles", Distro::OpenSUSE) 44 .Case("opensuse", Distro::OpenSUSE) 45 .Case("exherbo", Distro::Exherbo) 46 .Default(Distro::UnknownDistro); 47 return Version; 48 } 49 50 static Distro::DistroType DetectLsbRelease(llvm::vfs::FileSystem &VFS) { 51 llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> File = 52 VFS.getBufferForFile("/etc/lsb-release"); 53 if (!File) 54 return Distro::UnknownDistro; 55 56 SmallVector<StringRef, 16> Lines; 57 File.get()->getBuffer().split(Lines, "\n"); 58 Distro::DistroType Version = Distro::UnknownDistro; 59 60 for (StringRef Line : Lines) 61 if (Version == Distro::UnknownDistro && 62 Line.startswith("DISTRIB_CODENAME=")) 63 Version = llvm::StringSwitch<Distro::DistroType>(Line.substr(17)) 64 .Case("hardy", Distro::UbuntuHardy) 65 .Case("intrepid", Distro::UbuntuIntrepid) 66 .Case("jaunty", Distro::UbuntuJaunty) 67 .Case("karmic", Distro::UbuntuKarmic) 68 .Case("lucid", Distro::UbuntuLucid) 69 .Case("maverick", Distro::UbuntuMaverick) 70 .Case("natty", Distro::UbuntuNatty) 71 .Case("oneiric", Distro::UbuntuOneiric) 72 .Case("precise", Distro::UbuntuPrecise) 73 .Case("quantal", Distro::UbuntuQuantal) 74 .Case("raring", Distro::UbuntuRaring) 75 .Case("saucy", Distro::UbuntuSaucy) 76 .Case("trusty", Distro::UbuntuTrusty) 77 .Case("utopic", Distro::UbuntuUtopic) 78 .Case("vivid", Distro::UbuntuVivid) 79 .Case("wily", Distro::UbuntuWily) 80 .Case("xenial", Distro::UbuntuXenial) 81 .Case("yakkety", Distro::UbuntuYakkety) 82 .Case("zesty", Distro::UbuntuZesty) 83 .Case("artful", Distro::UbuntuArtful) 84 .Case("bionic", Distro::UbuntuBionic) 85 .Case("cosmic", Distro::UbuntuCosmic) 86 .Case("disco", Distro::UbuntuDisco) 87 .Case("eoan", Distro::UbuntuEoan) 88 .Case("focal", Distro::UbuntuFocal) 89 .Case("groovy", Distro::UbuntuGroovy) 90 .Case("hirsute", Distro::UbuntuHirsute) 91 .Default(Distro::UnknownDistro); 92 return Version; 93 } 94 95 static Distro::DistroType DetectDistro(llvm::vfs::FileSystem &VFS) { 96 Distro::DistroType Version = Distro::UnknownDistro; 97 98 // Newer freedesktop.org's compilant systemd-based systems 99 // should provide /etc/os-release or /usr/lib/os-release. 100 Version = DetectOsRelease(VFS); 101 if (Version != Distro::UnknownDistro) 102 return Version; 103 104 // Older systems might provide /etc/lsb-release. 105 Version = DetectLsbRelease(VFS); 106 if (Version != Distro::UnknownDistro) 107 return Version; 108 109 // Otherwise try some distro-specific quirks for RedHat... 110 llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> File = 111 VFS.getBufferForFile("/etc/redhat-release"); 112 113 if (File) { 114 StringRef Data = File.get()->getBuffer(); 115 if (Data.startswith("Fedora release")) 116 return Distro::Fedora; 117 if (Data.startswith("Red Hat Enterprise Linux") || 118 Data.startswith("CentOS") || Data.startswith("Scientific Linux")) { 119 if (Data.find("release 7") != StringRef::npos) 120 return Distro::RHEL7; 121 else if (Data.find("release 6") != StringRef::npos) 122 return Distro::RHEL6; 123 else if (Data.find("release 5") != StringRef::npos) 124 return Distro::RHEL5; 125 } 126 return Distro::UnknownDistro; 127 } 128 129 // ...for Debian 130 File = VFS.getBufferForFile("/etc/debian_version"); 131 if (File) { 132 StringRef Data = File.get()->getBuffer(); 133 // Contents: < major.minor > or < codename/sid > 134 int MajorVersion; 135 if (!Data.split('.').first.getAsInteger(10, MajorVersion)) { 136 switch (MajorVersion) { 137 case 5: 138 return Distro::DebianLenny; 139 case 6: 140 return Distro::DebianSqueeze; 141 case 7: 142 return Distro::DebianWheezy; 143 case 8: 144 return Distro::DebianJessie; 145 case 9: 146 return Distro::DebianStretch; 147 case 10: 148 return Distro::DebianBuster; 149 case 11: 150 return Distro::DebianBullseye; 151 default: 152 return Distro::UnknownDistro; 153 } 154 } 155 return llvm::StringSwitch<Distro::DistroType>(Data.split("\n").first) 156 .Case("squeeze/sid", Distro::DebianSqueeze) 157 .Case("wheezy/sid", Distro::DebianWheezy) 158 .Case("jessie/sid", Distro::DebianJessie) 159 .Case("stretch/sid", Distro::DebianStretch) 160 .Case("buster/sid", Distro::DebianBuster) 161 .Case("bullseye/sid", Distro::DebianBullseye) 162 .Default(Distro::UnknownDistro); 163 } 164 165 // ...for SUSE 166 File = VFS.getBufferForFile("/etc/SuSE-release"); 167 if (File) { 168 StringRef Data = File.get()->getBuffer(); 169 SmallVector<StringRef, 8> Lines; 170 Data.split(Lines, "\n"); 171 for (const StringRef &Line : Lines) { 172 if (!Line.trim().startswith("VERSION")) 173 continue; 174 std::pair<StringRef, StringRef> SplitLine = Line.split('='); 175 // Old versions have split VERSION and PATCHLEVEL 176 // Newer versions use VERSION = x.y 177 std::pair<StringRef, StringRef> SplitVer = 178 SplitLine.second.trim().split('.'); 179 int Version; 180 181 // OpenSUSE/SLES 10 and older are not supported and not compatible 182 // with our rules, so just treat them as Distro::UnknownDistro. 183 if (!SplitVer.first.getAsInteger(10, Version) && Version > 10) 184 return Distro::OpenSUSE; 185 return Distro::UnknownDistro; 186 } 187 return Distro::UnknownDistro; 188 } 189 190 // ...and others. 191 if (VFS.exists("/etc/exherbo-release")) 192 return Distro::Exherbo; 193 194 if (VFS.exists("/etc/alpine-release")) 195 return Distro::AlpineLinux; 196 197 if (VFS.exists("/etc/arch-release")) 198 return Distro::ArchLinux; 199 200 if (VFS.exists("/etc/gentoo-release")) 201 return Distro::Gentoo; 202 203 return Distro::UnknownDistro; 204 } 205 206 static Distro::DistroType GetDistro(llvm::vfs::FileSystem &VFS, 207 const llvm::Triple &TargetOrHost) { 208 // If we don't target Linux, no need to check the distro. This saves a few 209 // OS calls. 210 if (!TargetOrHost.isOSLinux()) 211 return Distro::UnknownDistro; 212 213 // True if we're backed by a real file system. 214 const bool onRealFS = (llvm::vfs::getRealFileSystem() == &VFS); 215 216 // If the host is not running Linux, and we're backed by a real file 217 // system, no need to check the distro. This is the case where someone 218 // is cross-compiling from BSD or Windows to Linux, and it would be 219 // meaningless to try to figure out the "distro" of the non-Linux host. 220 llvm::Triple HostTriple(llvm::sys::getProcessTriple()); 221 if (!HostTriple.isOSLinux() && onRealFS) 222 return Distro::UnknownDistro; 223 224 if (onRealFS) { 225 // If we're backed by a real file system, perform 226 // the detection only once and save the result. 227 static Distro::DistroType LinuxDistro = DetectDistro(VFS); 228 return LinuxDistro; 229 } 230 // This is mostly for passing tests which uses llvm::vfs::InMemoryFileSystem, 231 // which is not "real". 232 return DetectDistro(VFS); 233 } 234 235 Distro::Distro(llvm::vfs::FileSystem &VFS, const llvm::Triple &TargetOrHost) 236 : DistroVal(GetDistro(VFS, TargetOrHost)) {} 237