1//===-- llvm/Debuginfod/Debuginfod.cpp - Debuginfod client library --------===//
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/// \file
10///
11/// This file contains several definitions for the debuginfod client and server.
12/// For the client, this file defines the fetchInfo function. For the server,
13/// this file defines the DebuginfodLogEntry and DebuginfodServer structs, as
14/// well as the DebuginfodLog, DebuginfodCollection classes. The fetchInfo
15/// function retrieves any of the three supported artifact types: (executable,
16/// debuginfo, source file) associated with a build-id from debuginfod servers.
17/// If a source file is to be fetched, its absolute path must be specified in
18/// the Description argument to fetchInfo. The DebuginfodLogEntry,
19/// DebuginfodLog, and DebuginfodCollection are used by the DebuginfodServer to
20/// scan the local filesystem for binaries and serve the debuginfod protocol.
21///
22//===----------------------------------------------------------------------===//
23
24#include "llvm/Debuginfod/Debuginfod.h"
25#include "llvm/ADT/StringExtras.h"
26#include "llvm/ADT/StringRef.h"
27#include "llvm/BinaryFormat/Magic.h"
28#include "llvm/DebugInfo/DWARF/DWARFContext.h"
29#include "llvm/DebugInfo/Symbolize/Symbolize.h"
30#include "llvm/Debuginfod/HTTPClient.h"
31#include "llvm/Object/BuildID.h"
32#include "llvm/Object/ELFObjectFile.h"
33#include "llvm/Support/CachePruning.h"
34#include "llvm/Support/Caching.h"
35#include "llvm/Support/Errc.h"
36#include "llvm/Support/Error.h"
37#include "llvm/Support/FileUtilities.h"
38#include "llvm/Support/MemoryBuffer.h"
39#include "llvm/Support/Path.h"
40#include "llvm/Support/ThreadPool.h"
41#include "llvm/Support/xxhash.h"
42
43#include <atomic>
44#include <optional>
45#include <thread>
46
47namespace llvm {
48
49using llvm::object::BuildIDRef;
50
51namespace {
52std::optional<SmallVector<StringRef>> DebuginfodUrls;
53// Many Readers/Single Writer lock protecting the global debuginfod URL list.
54llvm::sys::RWMutex UrlsMutex;
55} // namespace
56
57std::string getDebuginfodCacheKey(llvm::StringRef S) {
58 return utostr(X: xxh3_64bits(data: S));
59}
60
61// Returns a binary BuildID as a normalized hex string.
62// Uses lowercase for compatibility with common debuginfod servers.
63static std::string buildIDToString(BuildIDRef ID) {
64 return llvm::toHex(Input: ID, /*LowerCase=*/true);
65}
66
67bool canUseDebuginfod() {
68 return HTTPClient::isAvailable() && !getDefaultDebuginfodUrls().empty();
69}
70
71SmallVector<StringRef> getDefaultDebuginfodUrls() {
72 std::shared_lock<llvm::sys::RWMutex> ReadGuard(UrlsMutex);
73 if (!DebuginfodUrls) {
74 // Only read from the environment variable if the user hasn't already
75 // set the value.
76 ReadGuard.unlock();
77 std::unique_lock<llvm::sys::RWMutex> WriteGuard(UrlsMutex);
78 DebuginfodUrls = SmallVector<StringRef>();
79 if (const char *DebuginfodUrlsEnv = std::getenv(name: "DEBUGINFOD_URLS")) {
80 StringRef(DebuginfodUrlsEnv)
81 .split(A&: DebuginfodUrls.value(), Separator: " ", MaxSplit: -1, KeepEmpty: false);
82 }
83 WriteGuard.unlock();
84 ReadGuard.lock();
85 }
86 return DebuginfodUrls.value();
87}
88
89// Set the default debuginfod URL list, override the environment variable.
90void setDefaultDebuginfodUrls(const SmallVector<StringRef> &URLs) {
91 std::unique_lock<llvm::sys::RWMutex> WriteGuard(UrlsMutex);
92 DebuginfodUrls = URLs;
93}
94
95/// Finds a default local file caching directory for the debuginfod client,
96/// first checking DEBUGINFOD_CACHE_PATH.
97Expected<std::string> getDefaultDebuginfodCacheDirectory() {
98 if (const char *CacheDirectoryEnv = std::getenv(name: "DEBUGINFOD_CACHE_PATH"))
99 return CacheDirectoryEnv;
100
101 SmallString<64> CacheDirectory;
102 if (!sys::path::cache_directory(result&: CacheDirectory))
103 return createStringError(
104 EC: errc::io_error, S: "Unable to determine appropriate cache directory.");
105 sys::path::append(path&: CacheDirectory, a: "llvm-debuginfod", b: "client");
106 return std::string(CacheDirectory);
107}
108
109std::chrono::milliseconds getDefaultDebuginfodTimeout() {
110 long Timeout;
111 const char *DebuginfodTimeoutEnv = std::getenv(name: "DEBUGINFOD_TIMEOUT");
112 if (DebuginfodTimeoutEnv &&
113 to_integer(S: StringRef(DebuginfodTimeoutEnv).trim(), Num&: Timeout, Base: 10))
114 return std::chrono::milliseconds(Timeout * 1000);
115
116 return std::chrono::milliseconds(90 * 1000);
117}
118
119/// The following functions fetch a debuginfod artifact to a file in a local
120/// cache and return the cached file path. They first search the local cache,
121/// followed by the debuginfod servers.
122
123std::string getDebuginfodSourceUrlPath(BuildIDRef ID,
124 StringRef SourceFilePath) {
125 SmallString<64> UrlPath;
126 sys::path::append(path&: UrlPath, style: sys::path::Style::posix, a: "buildid",
127 b: buildIDToString(ID), c: "source",
128 d: sys::path::convert_to_slash(path: SourceFilePath));
129 return std::string(UrlPath);
130}
131
132Expected<std::string> getCachedOrDownloadSource(BuildIDRef ID,
133 StringRef SourceFilePath) {
134 std::string UrlPath = getDebuginfodSourceUrlPath(ID, SourceFilePath);
135 return getCachedOrDownloadArtifact(UniqueKey: getDebuginfodCacheKey(S: UrlPath), UrlPath);
136}
137
138std::string getDebuginfodExecutableUrlPath(BuildIDRef ID) {
139 SmallString<64> UrlPath;
140 sys::path::append(path&: UrlPath, style: sys::path::Style::posix, a: "buildid",
141 b: buildIDToString(ID), c: "executable");
142 return std::string(UrlPath);
143}
144
145Expected<std::string> getCachedOrDownloadExecutable(BuildIDRef ID) {
146 std::string UrlPath = getDebuginfodExecutableUrlPath(ID);
147 return getCachedOrDownloadArtifact(UniqueKey: getDebuginfodCacheKey(S: UrlPath), UrlPath);
148}
149
150std::string getDebuginfodDebuginfoUrlPath(BuildIDRef ID) {
151 SmallString<64> UrlPath;
152 sys::path::append(path&: UrlPath, style: sys::path::Style::posix, a: "buildid",
153 b: buildIDToString(ID), c: "debuginfo");
154 return std::string(UrlPath);
155}
156
157Expected<std::string> getCachedOrDownloadDebuginfo(BuildIDRef ID) {
158 std::string UrlPath = getDebuginfodDebuginfoUrlPath(ID);
159 return getCachedOrDownloadArtifact(UniqueKey: getDebuginfodCacheKey(S: UrlPath), UrlPath);
160}
161
162// General fetching function.
163Expected<std::string> getCachedOrDownloadArtifact(StringRef UniqueKey,
164 StringRef UrlPath) {
165 SmallString<10> CacheDir;
166
167 Expected<std::string> CacheDirOrErr = getDefaultDebuginfodCacheDirectory();
168 if (!CacheDirOrErr)
169 return CacheDirOrErr.takeError();
170 CacheDir = *CacheDirOrErr;
171
172 return getCachedOrDownloadArtifact(UniqueKey, UrlPath, CacheDirectoryPath: CacheDir,
173 DebuginfodUrls: getDefaultDebuginfodUrls(),
174 Timeout: getDefaultDebuginfodTimeout());
175}
176
177namespace {
178
179/// A simple handler which streams the returned data to a cache file. The cache
180/// file is only created if a 200 OK status is observed.
181class StreamedHTTPResponseHandler : public HTTPResponseHandler {
182 using CreateStreamFn =
183 std::function<Expected<std::unique_ptr<CachedFileStream>>()>;
184 CreateStreamFn CreateStream;
185 HTTPClient &Client;
186 std::unique_ptr<CachedFileStream> FileStream;
187
188public:
189 StreamedHTTPResponseHandler(CreateStreamFn CreateStream, HTTPClient &Client)
190 : CreateStream(CreateStream), Client(Client) {}
191 virtual ~StreamedHTTPResponseHandler() = default;
192
193 Error handleBodyChunk(StringRef BodyChunk) override;
194};
195
196} // namespace
197
198Error StreamedHTTPResponseHandler::handleBodyChunk(StringRef BodyChunk) {
199 if (!FileStream) {
200 unsigned Code = Client.responseCode();
201 if (Code && Code != 200)
202 return Error::success();
203 Expected<std::unique_ptr<CachedFileStream>> FileStreamOrError =
204 CreateStream();
205 if (!FileStreamOrError)
206 return FileStreamOrError.takeError();
207 FileStream = std::move(*FileStreamOrError);
208 }
209 *FileStream->OS << BodyChunk;
210 return Error::success();
211}
212
213// An over-accepting simplification of the HTTP RFC 7230 spec.
214static bool isHeader(StringRef S) {
215 StringRef Name;
216 StringRef Value;
217 std::tie(args&: Name, args&: Value) = S.split(Separator: ':');
218 if (Name.empty() || Value.empty())
219 return false;
220 return all_of(Range&: Name, P: [](char C) { return llvm::isPrint(C) && C != ' '; }) &&
221 all_of(Range&: Value, P: [](char C) { return llvm::isPrint(C) || C == '\t'; });
222}
223
224static SmallVector<std::string, 0> getHeaders() {
225 const char *Filename = getenv(name: "DEBUGINFOD_HEADERS_FILE");
226 if (!Filename)
227 return {};
228 ErrorOr<std::unique_ptr<MemoryBuffer>> HeadersFile =
229 MemoryBuffer::getFile(Filename, /*IsText=*/true);
230 if (!HeadersFile)
231 return {};
232
233 SmallVector<std::string, 0> Headers;
234 uint64_t LineNumber = 0;
235 for (StringRef Line : llvm::split(Str: (*HeadersFile)->getBuffer(), Separator: '\n')) {
236 LineNumber++;
237 if (!Line.empty() && Line.back() == '\r')
238 Line = Line.drop_back();
239 if (!isHeader(S: Line)) {
240 if (!all_of(Range&: Line, P: llvm::isSpace))
241 WithColor::warning()
242 << "could not parse debuginfod header: " << Filename << ':'
243 << LineNumber << '\n';
244 continue;
245 }
246 Headers.emplace_back(Args&: Line);
247 }
248 return Headers;
249}
250
251Expected<std::string> getCachedOrDownloadArtifact(
252 StringRef UniqueKey, StringRef UrlPath, StringRef CacheDirectoryPath,
253 ArrayRef<StringRef> DebuginfodUrls, std::chrono::milliseconds Timeout) {
254 SmallString<64> AbsCachedArtifactPath;
255 sys::path::append(path&: AbsCachedArtifactPath, a: CacheDirectoryPath,
256 b: "llvmcache-" + UniqueKey);
257
258 Expected<FileCache> CacheOrErr =
259 localCache(CacheNameRef: "Debuginfod-client", TempFilePrefixRef: ".debuginfod-client", CacheDirectoryPathRef: CacheDirectoryPath);
260 if (!CacheOrErr)
261 return CacheOrErr.takeError();
262
263 FileCache Cache = *CacheOrErr;
264 // We choose an arbitrary Task parameter as we do not make use of it.
265 unsigned Task = 0;
266 Expected<AddStreamFn> CacheAddStreamOrErr = Cache(Task, UniqueKey, "");
267 if (!CacheAddStreamOrErr)
268 return CacheAddStreamOrErr.takeError();
269 AddStreamFn &CacheAddStream = *CacheAddStreamOrErr;
270 if (!CacheAddStream)
271 return std::string(AbsCachedArtifactPath);
272 // The artifact was not found in the local cache, query the debuginfod
273 // servers.
274 if (!HTTPClient::isAvailable())
275 return createStringError(EC: errc::io_error,
276 S: "No working HTTP client is available.");
277
278 if (!HTTPClient::IsInitialized)
279 return createStringError(
280 EC: errc::io_error,
281 S: "A working HTTP client is available, but it is not initialized. To "
282 "allow Debuginfod to make HTTP requests, call HTTPClient::initialize() "
283 "at the beginning of main.");
284
285 HTTPClient Client;
286 Client.setTimeout(Timeout);
287 for (StringRef ServerUrl : DebuginfodUrls) {
288 SmallString<64> ArtifactUrl;
289 sys::path::append(path&: ArtifactUrl, style: sys::path::Style::posix, a: ServerUrl, b: UrlPath);
290
291 // Perform the HTTP request and if successful, write the response body to
292 // the cache.
293 {
294 StreamedHTTPResponseHandler Handler(
295 [&]() { return CacheAddStream(Task, ""); }, Client);
296 HTTPRequest Request(ArtifactUrl);
297 Request.Headers = getHeaders();
298 Error Err = Client.perform(Request, Handler);
299 if (Err)
300 return std::move(Err);
301
302 unsigned Code = Client.responseCode();
303 if (Code && Code != 200)
304 continue;
305 }
306
307 Expected<CachePruningPolicy> PruningPolicyOrErr =
308 parseCachePruningPolicy(PolicyStr: std::getenv(name: "DEBUGINFOD_CACHE_POLICY"));
309 if (!PruningPolicyOrErr)
310 return PruningPolicyOrErr.takeError();
311 pruneCache(Path: CacheDirectoryPath, Policy: *PruningPolicyOrErr);
312
313 // Return the path to the artifact on disk.
314 return std::string(AbsCachedArtifactPath);
315 }
316
317 return createStringError(EC: errc::argument_out_of_domain, S: "build id not found");
318}
319
320DebuginfodLogEntry::DebuginfodLogEntry(const Twine &Message)
321 : Message(Message.str()) {}
322
323void DebuginfodLog::push(const Twine &Message) {
324 push(Entry: DebuginfodLogEntry(Message));
325}
326
327void DebuginfodLog::push(DebuginfodLogEntry Entry) {
328 {
329 std::lock_guard<std::mutex> Guard(QueueMutex);
330 LogEntryQueue.push(x: Entry);
331 }
332 QueueCondition.notify_one();
333}
334
335DebuginfodLogEntry DebuginfodLog::pop() {
336 {
337 std::unique_lock<std::mutex> Guard(QueueMutex);
338 // Wait for messages to be pushed into the queue.
339 QueueCondition.wait(lock&: Guard, p: [&] { return !LogEntryQueue.empty(); });
340 }
341 std::lock_guard<std::mutex> Guard(QueueMutex);
342 if (!LogEntryQueue.size())
343 llvm_unreachable("Expected message in the queue.");
344
345 DebuginfodLogEntry Entry = LogEntryQueue.front();
346 LogEntryQueue.pop();
347 return Entry;
348}
349
350DebuginfodCollection::DebuginfodCollection(ArrayRef<StringRef> PathsRef,
351 DebuginfodLog &Log,
352 ThreadPoolInterface &Pool,
353 double MinInterval)
354 : Log(Log), Pool(Pool), MinInterval(MinInterval) {
355 for (StringRef Path : PathsRef)
356 Paths.push_back(Elt: Path.str());
357}
358
359Error DebuginfodCollection::update() {
360 std::lock_guard<sys::Mutex> Guard(UpdateMutex);
361 if (UpdateTimer.isRunning())
362 UpdateTimer.stopTimer();
363 UpdateTimer.clear();
364 for (const std::string &Path : Paths) {
365 Log.push(Message: "Updating binaries at path " + Path);
366 if (Error Err = findBinaries(Path))
367 return Err;
368 }
369 Log.push(Message: "Updated collection");
370 UpdateTimer.startTimer();
371 return Error::success();
372}
373
374Expected<bool> DebuginfodCollection::updateIfStale() {
375 if (!UpdateTimer.isRunning())
376 return false;
377 UpdateTimer.stopTimer();
378 double Time = UpdateTimer.getTotalTime().getWallTime();
379 UpdateTimer.startTimer();
380 if (Time < MinInterval)
381 return false;
382 if (Error Err = update())
383 return std::move(Err);
384 return true;
385}
386
387Error DebuginfodCollection::updateForever(std::chrono::milliseconds Interval) {
388 while (true) {
389 if (Error Err = update())
390 return Err;
391 std::this_thread::sleep_for(rtime: Interval);
392 }
393 llvm_unreachable("updateForever loop should never end");
394}
395
396static bool hasELFMagic(StringRef FilePath) {
397 file_magic Type;
398 std::error_code EC = identify_magic(path: FilePath, result&: Type);
399 if (EC)
400 return false;
401 switch (Type) {
402 case file_magic::elf:
403 case file_magic::elf_relocatable:
404 case file_magic::elf_executable:
405 case file_magic::elf_shared_object:
406 case file_magic::elf_core:
407 return true;
408 default:
409 return false;
410 }
411}
412
413Error DebuginfodCollection::findBinaries(StringRef Path) {
414 std::error_code EC;
415 sys::fs::recursive_directory_iterator I(Twine(Path), EC), E;
416 std::mutex IteratorMutex;
417 ThreadPoolTaskGroup IteratorGroup(Pool);
418 for (unsigned WorkerIndex = 0; WorkerIndex < Pool.getMaxConcurrency();
419 WorkerIndex++) {
420 IteratorGroup.async(F: [&, this]() -> void {
421 std::string FilePath;
422 while (true) {
423 {
424 // Check if iteration is over or there is an error during iteration
425 std::lock_guard<std::mutex> Guard(IteratorMutex);
426 if (I == E || EC)
427 return;
428 // Grab a file path from the directory iterator and advance the
429 // iterator.
430 FilePath = I->path();
431 I.increment(ec&: EC);
432 }
433
434 // Inspect the file at this path to determine if it is debuginfo.
435 if (!hasELFMagic(FilePath))
436 continue;
437
438 Expected<object::OwningBinary<object::Binary>> BinOrErr =
439 object::createBinary(Path: FilePath);
440
441 if (!BinOrErr) {
442 consumeError(Err: BinOrErr.takeError());
443 continue;
444 }
445 object::Binary *Bin = std::move(BinOrErr.get().getBinary());
446 if (!Bin->isObject())
447 continue;
448
449 // TODO: Support non-ELF binaries
450 object::ELFObjectFileBase *Object =
451 dyn_cast<object::ELFObjectFileBase>(Val: Bin);
452 if (!Object)
453 continue;
454
455 BuildIDRef ID = getBuildID(Obj: Object);
456 if (ID.empty())
457 continue;
458
459 std::string IDString = buildIDToString(ID);
460 if (Object->hasDebugInfo()) {
461 std::lock_guard<sys::RWMutex> DebugBinariesGuard(DebugBinariesMutex);
462 (void)DebugBinaries.try_emplace(Key: IDString, Args: std::move(FilePath));
463 } else {
464 std::lock_guard<sys::RWMutex> BinariesGuard(BinariesMutex);
465 (void)Binaries.try_emplace(Key: IDString, Args: std::move(FilePath));
466 }
467 }
468 });
469 }
470 IteratorGroup.wait();
471 std::unique_lock<std::mutex> Guard(IteratorMutex);
472 if (EC)
473 return errorCodeToError(EC);
474 return Error::success();
475}
476
477Expected<std::optional<std::string>>
478DebuginfodCollection::getBinaryPath(BuildIDRef ID) {
479 Log.push(Message: "getting binary path of ID " + buildIDToString(ID));
480 std::shared_lock<sys::RWMutex> Guard(BinariesMutex);
481 auto Loc = Binaries.find(Key: buildIDToString(ID));
482 if (Loc != Binaries.end()) {
483 std::string Path = Loc->getValue();
484 return Path;
485 }
486 return std::nullopt;
487}
488
489Expected<std::optional<std::string>>
490DebuginfodCollection::getDebugBinaryPath(BuildIDRef ID) {
491 Log.push(Message: "getting debug binary path of ID " + buildIDToString(ID));
492 std::shared_lock<sys::RWMutex> Guard(DebugBinariesMutex);
493 auto Loc = DebugBinaries.find(Key: buildIDToString(ID));
494 if (Loc != DebugBinaries.end()) {
495 std::string Path = Loc->getValue();
496 return Path;
497 }
498 return std::nullopt;
499}
500
501Expected<std::string> DebuginfodCollection::findBinaryPath(BuildIDRef ID) {
502 {
503 // Check collection; perform on-demand update if stale.
504 Expected<std::optional<std::string>> PathOrErr = getBinaryPath(ID);
505 if (!PathOrErr)
506 return PathOrErr.takeError();
507 std::optional<std::string> Path = *PathOrErr;
508 if (!Path) {
509 Expected<bool> UpdatedOrErr = updateIfStale();
510 if (!UpdatedOrErr)
511 return UpdatedOrErr.takeError();
512 if (*UpdatedOrErr) {
513 // Try once more.
514 PathOrErr = getBinaryPath(ID);
515 if (!PathOrErr)
516 return PathOrErr.takeError();
517 Path = *PathOrErr;
518 }
519 }
520 if (Path)
521 return *Path;
522 }
523
524 // Try federation.
525 Expected<std::string> PathOrErr = getCachedOrDownloadExecutable(ID);
526 if (!PathOrErr)
527 consumeError(Err: PathOrErr.takeError());
528
529 // Fall back to debug binary.
530 return findDebugBinaryPath(ID);
531}
532
533Expected<std::string> DebuginfodCollection::findDebugBinaryPath(BuildIDRef ID) {
534 // Check collection; perform on-demand update if stale.
535 Expected<std::optional<std::string>> PathOrErr = getDebugBinaryPath(ID);
536 if (!PathOrErr)
537 return PathOrErr.takeError();
538 std::optional<std::string> Path = *PathOrErr;
539 if (!Path) {
540 Expected<bool> UpdatedOrErr = updateIfStale();
541 if (!UpdatedOrErr)
542 return UpdatedOrErr.takeError();
543 if (*UpdatedOrErr) {
544 // Try once more.
545 PathOrErr = getBinaryPath(ID);
546 if (!PathOrErr)
547 return PathOrErr.takeError();
548 Path = *PathOrErr;
549 }
550 }
551 if (Path)
552 return *Path;
553
554 // Try federation.
555 return getCachedOrDownloadDebuginfo(ID);
556}
557
558DebuginfodServer::DebuginfodServer(DebuginfodLog &Log,
559 DebuginfodCollection &Collection)
560 : Log(Log), Collection(Collection) {
561 cantFail(
562 Err: Server.get(UrlPathPattern: R"(/buildid/(.*)/debuginfo)", Handler: [&](HTTPServerRequest Request) {
563 Log.push(Message: "GET " + Request.UrlPath);
564 std::string IDString;
565 if (!tryGetFromHex(Input: Request.UrlPathMatches[0], Output&: IDString)) {
566 Request.setResponse(
567 {.Code: 404, .ContentType: "text/plain", .Body: "Build ID is not a hex string\n"});
568 return;
569 }
570 object::BuildID ID(IDString.begin(), IDString.end());
571 Expected<std::string> PathOrErr = Collection.findDebugBinaryPath(ID);
572 if (Error Err = PathOrErr.takeError()) {
573 consumeError(Err: std::move(Err));
574 Request.setResponse({.Code: 404, .ContentType: "text/plain", .Body: "Build ID not found\n"});
575 return;
576 }
577 streamFile(Request, FilePath: *PathOrErr);
578 }));
579 cantFail(
580 Err: Server.get(UrlPathPattern: R"(/buildid/(.*)/executable)", Handler: [&](HTTPServerRequest Request) {
581 Log.push(Message: "GET " + Request.UrlPath);
582 std::string IDString;
583 if (!tryGetFromHex(Input: Request.UrlPathMatches[0], Output&: IDString)) {
584 Request.setResponse(
585 {.Code: 404, .ContentType: "text/plain", .Body: "Build ID is not a hex string\n"});
586 return;
587 }
588 object::BuildID ID(IDString.begin(), IDString.end());
589 Expected<std::string> PathOrErr = Collection.findBinaryPath(ID);
590 if (Error Err = PathOrErr.takeError()) {
591 consumeError(Err: std::move(Err));
592 Request.setResponse({.Code: 404, .ContentType: "text/plain", .Body: "Build ID not found\n"});
593 return;
594 }
595 streamFile(Request, FilePath: *PathOrErr);
596 }));
597}
598
599} // namespace llvm
600