clang 19.0.0git
Distro.cpp
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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
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/Support/Threading.h"
17#include "llvm/TargetParser/Host.h"
18#include "llvm/TargetParser/Triple.h"
19
20using namespace clang::driver;
21using namespace clang;
22
23static 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)
30
32 File.get()->getBuffer().split(Lines, "\n");
34
35 // Obviously this can be improved a lot.
36 for (StringRef Line : Lines)
37 if (Version == Distro::UnknownDistro && Line.starts_with("ID="))
38 Version = llvm::StringSwitch<Distro::DistroType>(Line.substr(3))
39 .Case("alpine", Distro::AlpineLinux)
40 .Case("fedora", Distro::Fedora)
41 .Case("gentoo", Distro::Gentoo)
42 .Case("arch", Distro::ArchLinux)
43 // On SLES, /etc/os-release was introduced in SLES 11.
44 .Case("sles", Distro::OpenSUSE)
45 .Case("opensuse", Distro::OpenSUSE)
46 .Case("exherbo", Distro::Exherbo)
47 .Default(Distro::UnknownDistro);
48 return Version;
49}
50
51static Distro::DistroType DetectLsbRelease(llvm::vfs::FileSystem &VFS) {
52 llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> File =
53 VFS.getBufferForFile("/etc/lsb-release");
54 if (!File)
56
58 File.get()->getBuffer().split(Lines, "\n");
60
61 for (StringRef Line : Lines)
62 if (Version == Distro::UnknownDistro &&
63 Line.starts_with("DISTRIB_CODENAME="))
64 Version = llvm::StringSwitch<Distro::DistroType>(Line.substr(17))
65 .Case("hardy", Distro::UbuntuHardy)
66 .Case("intrepid", Distro::UbuntuIntrepid)
67 .Case("jaunty", Distro::UbuntuJaunty)
68 .Case("karmic", Distro::UbuntuKarmic)
69 .Case("lucid", Distro::UbuntuLucid)
70 .Case("maverick", Distro::UbuntuMaverick)
71 .Case("natty", Distro::UbuntuNatty)
72 .Case("oneiric", Distro::UbuntuOneiric)
73 .Case("precise", Distro::UbuntuPrecise)
74 .Case("quantal", Distro::UbuntuQuantal)
75 .Case("raring", Distro::UbuntuRaring)
76 .Case("saucy", Distro::UbuntuSaucy)
77 .Case("trusty", Distro::UbuntuTrusty)
78 .Case("utopic", Distro::UbuntuUtopic)
79 .Case("vivid", Distro::UbuntuVivid)
80 .Case("wily", Distro::UbuntuWily)
81 .Case("xenial", Distro::UbuntuXenial)
82 .Case("yakkety", Distro::UbuntuYakkety)
83 .Case("zesty", Distro::UbuntuZesty)
84 .Case("artful", Distro::UbuntuArtful)
85 .Case("bionic", Distro::UbuntuBionic)
86 .Case("cosmic", Distro::UbuntuCosmic)
87 .Case("disco", Distro::UbuntuDisco)
88 .Case("eoan", Distro::UbuntuEoan)
89 .Case("focal", Distro::UbuntuFocal)
90 .Case("groovy", Distro::UbuntuGroovy)
91 .Case("hirsute", Distro::UbuntuHirsute)
92 .Case("impish", Distro::UbuntuImpish)
93 .Case("jammy", Distro::UbuntuJammy)
94 .Case("kinetic", Distro::UbuntuKinetic)
95 .Case("lunar", Distro::UbuntuLunar)
96 .Case("mantic", Distro::UbuntuMantic)
97 .Case("noble", Distro::UbuntuNoble)
98 .Default(Distro::UnknownDistro);
99 return Version;
100}
101
102static Distro::DistroType DetectDistro(llvm::vfs::FileSystem &VFS) {
104
105 // Newer freedesktop.org's compilant systemd-based systems
106 // should provide /etc/os-release or /usr/lib/os-release.
107 Version = DetectOsRelease(VFS);
108 if (Version != Distro::UnknownDistro)
109 return Version;
110
111 // Older systems might provide /etc/lsb-release.
112 Version = DetectLsbRelease(VFS);
113 if (Version != Distro::UnknownDistro)
114 return Version;
115
116 // Otherwise try some distro-specific quirks for Red Hat...
117 llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> File =
118 VFS.getBufferForFile("/etc/redhat-release");
119
120 if (File) {
121 StringRef Data = File.get()->getBuffer();
122 if (Data.starts_with("Fedora release"))
123 return Distro::Fedora;
124 if (Data.starts_with("Red Hat Enterprise Linux") ||
125 Data.starts_with("CentOS") || Data.starts_with("Scientific Linux")) {
126 if (Data.contains("release 7"))
127 return Distro::RHEL7;
128 else if (Data.contains("release 6"))
129 return Distro::RHEL6;
130 else if (Data.contains("release 5"))
131 return Distro::RHEL5;
132 }
134 }
135
136 // ...for Debian
137 File = VFS.getBufferForFile("/etc/debian_version");
138 if (File) {
139 StringRef Data = File.get()->getBuffer();
140 // Contents: < major.minor > or < codename/sid >
141 int MajorVersion;
142 if (!Data.split('.').first.getAsInteger(10, MajorVersion)) {
143 switch (MajorVersion) {
144 case 5:
145 return Distro::DebianLenny;
146 case 6:
148 case 7:
150 case 8:
152 case 9:
154 case 10:
156 case 11:
158 case 12:
160 case 13:
162 default:
164 }
165 }
166 return llvm::StringSwitch<Distro::DistroType>(Data.split("\n").first)
167 .Case("squeeze/sid", Distro::DebianSqueeze)
168 .Case("wheezy/sid", Distro::DebianWheezy)
169 .Case("jessie/sid", Distro::DebianJessie)
170 .Case("stretch/sid", Distro::DebianStretch)
171 .Case("buster/sid", Distro::DebianBuster)
172 .Case("bullseye/sid", Distro::DebianBullseye)
173 .Case("bookworm/sid", Distro::DebianBookworm)
174 .Case("trixie/sid", Distro::DebianTrixie)
175 .Default(Distro::UnknownDistro);
176 }
177
178 // ...for SUSE
179 File = VFS.getBufferForFile("/etc/SuSE-release");
180 if (File) {
181 StringRef Data = File.get()->getBuffer();
183 Data.split(Lines, "\n");
184 for (const StringRef &Line : Lines) {
185 if (!Line.trim().starts_with("VERSION"))
186 continue;
187 std::pair<StringRef, StringRef> SplitLine = Line.split('=');
188 // Old versions have split VERSION and PATCHLEVEL
189 // Newer versions use VERSION = x.y
190 std::pair<StringRef, StringRef> SplitVer =
191 SplitLine.second.trim().split('.');
192 int Version;
193
194 // OpenSUSE/SLES 10 and older are not supported and not compatible
195 // with our rules, so just treat them as Distro::UnknownDistro.
196 if (!SplitVer.first.getAsInteger(10, Version) && Version > 10)
197 return Distro::OpenSUSE;
199 }
201 }
202
203 // ...and others.
204 if (VFS.exists("/etc/gentoo-release"))
205 return Distro::Gentoo;
206
208}
209
210static Distro::DistroType GetDistro(llvm::vfs::FileSystem &VFS,
211 const llvm::Triple &TargetOrHost) {
212 // If we don't target Linux, no need to check the distro. This saves a few
213 // OS calls.
214 if (!TargetOrHost.isOSLinux())
216
217 // True if we're backed by a real file system.
218 const bool onRealFS = (llvm::vfs::getRealFileSystem() == &VFS);
219
220 // If the host is not running Linux, and we're backed by a real file
221 // system, no need to check the distro. This is the case where someone
222 // is cross-compiling from BSD or Windows to Linux, and it would be
223 // meaningless to try to figure out the "distro" of the non-Linux host.
224 llvm::Triple HostTriple(llvm::sys::getProcessTriple());
225 if (!HostTriple.isOSLinux() && onRealFS)
227
228 if (onRealFS) {
229 // If we're backed by a real file system, perform
230 // the detection only once and save the result.
231 static Distro::DistroType LinuxDistro = DetectDistro(VFS);
232 return LinuxDistro;
233 }
234 // This is mostly for passing tests which uses llvm::vfs::InMemoryFileSystem,
235 // which is not "real".
236 return DetectDistro(VFS);
237}
238
239Distro::Distro(llvm::vfs::FileSystem &VFS, const llvm::Triple &TargetOrHost)
240 : DistroVal(GetDistro(VFS, TargetOrHost)) {}
static Distro::DistroType DetectOsRelease(llvm::vfs::FileSystem &VFS)
Definition: Distro.cpp:23
static Distro::DistroType DetectLsbRelease(llvm::vfs::FileSystem &VFS)
Definition: Distro.cpp:51
static Distro::DistroType DetectDistro(llvm::vfs::FileSystem &VFS)
Definition: Distro.cpp:102
static Distro::DistroType GetDistro(llvm::vfs::FileSystem &VFS, const llvm::Triple &TargetOrHost)
Definition: Distro.cpp:210
Forward-declares and imports various common LLVM datatypes that clang wants to use unqualified.
const char * Data
Distro()
Default constructor leaves the distribution unknown.
Definition: Distro.h:94
The JSON file list parser is used to communicate input to InstallAPI.