1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
|
#include "worker.hh"
#include "substitution-goal.hh"
#include "nar-info.hh"
#include "signals.hh"
#include "finally.hh"
#include <kj/array.h>
#include <kj/vector.h>
namespace nix {
PathSubstitutionGoal::PathSubstitutionGoal(
const StorePath & storePath,
Worker & worker,
bool isDependency,
RepairFlag repair,
std::optional<ContentAddress> ca
)
: Goal(worker, isDependency)
, storePath(storePath)
, repair(repair)
, ca(ca)
{
name = fmt("substitution of '%s'", worker.store.printStorePath(this->storePath));
trace("created");
maintainExpectedSubstitutions = worker.expectedSubstitutions.addTemporarily(1);
}
PathSubstitutionGoal::~PathSubstitutionGoal()
{
cleanup();
}
Goal::WorkResult PathSubstitutionGoal::done(
ExitCode result,
BuildResult::Status status,
std::optional<std::string> errorMsg)
{
buildResult.status = status;
if (errorMsg) {
debug(*errorMsg);
buildResult.errorMsg = *errorMsg;
}
return WorkResult{result, std::move(buildResult)};
}
kj::Promise<Result<Goal::WorkResult>> PathSubstitutionGoal::work() noexcept
try {
trace("init");
worker.store.addTempRoot(storePath);
/* If the path already exists we're done. */
if (!repair && worker.store.isValidPath(storePath)) {
return {done(ecSuccess, BuildResult::AlreadyValid)};
}
if (settings.readOnlyMode)
throw Error("cannot substitute path '%s' - no write access to the Nix store", worker.store.printStorePath(storePath));
subs = settings.useSubstitutes ? getDefaultSubstituters() : std::list<ref<Store>>();
return tryNext();
} catch (...) {
return {std::current_exception()};
}
kj::Promise<Result<Goal::WorkResult>> PathSubstitutionGoal::tryNext() noexcept
try {
trace("trying next substituter");
cleanup();
if (subs.size() == 0) {
/* None left. Terminate this goal and let someone else deal
with it. */
if (substituterFailed) {
worker.failedSubstitutions++;
}
/* Hack: don't indicate failure if there were no substituters.
In that case the calling derivation should just do a
build. */
co_return done(
substituterFailed ? ecFailed : ecNoSubstituters,
BuildResult::NoSubstituters,
fmt("path '%s' is required, but there is no substituter that can build it", worker.store.printStorePath(storePath)));
}
sub = subs.front();
subs.pop_front();
if (ca) {
subPath = sub->makeFixedOutputPathFromCA(
std::string { storePath.name() },
ContentAddressWithReferences::withoutRefs(*ca));
if (sub->storeDir == worker.store.storeDir)
assert(subPath == storePath);
} else if (sub->storeDir != worker.store.storeDir) {
co_return co_await tryNext();
}
do {
try {
// FIXME: make async
info = sub->queryPathInfo(subPath ? *subPath : storePath);
break;
} catch (InvalidPath &) {
} catch (SubstituterDisabled &) {
if (!settings.tryFallback) {
throw;
}
} catch (Error & e) {
if (settings.tryFallback) {
logError(e.info());
} else {
throw;
}
}
co_return co_await tryNext();
} while (false);
if (info->path != storePath) {
if (info->isContentAddressed(*sub) && info->references.empty()) {
auto info2 = std::make_shared<ValidPathInfo>(*info);
info2->path = storePath;
info = info2;
} else {
printError("asked '%s' for '%s' but got '%s'",
sub->getUri(), worker.store.printStorePath(storePath), sub->printStorePath(info->path));
co_return co_await tryNext();
}
}
/* Update the total expected download size. */
auto narInfo = std::dynamic_pointer_cast<const NarInfo>(info);
maintainExpectedNar = worker.expectedNarSize.addTemporarily(info->narSize);
maintainExpectedDownload =
narInfo && narInfo->fileSize
? worker.expectedDownloadSize.addTemporarily(narInfo->fileSize)
: nullptr;
/* Bail out early if this substituter lacks a valid
signature. LocalStore::addToStore() also checks for this, but
only after we've downloaded the path. */
if (!sub->isTrusted && worker.store.pathInfoIsUntrusted(*info))
{
warn("ignoring substitute for '%s' from '%s', as it's not signed by any of the keys in 'trusted-public-keys'",
worker.store.printStorePath(storePath), sub->getUri());
co_return co_await tryNext();
}
/* To maintain the closure invariant, we first have to realise the
paths referenced by this one. */
kj::Vector<std::pair<GoalPtr, kj::Promise<void>>> dependencies;
for (auto & i : info->references)
if (i != storePath) /* ignore self-references */
dependencies.add(worker.goalFactory().makePathSubstitutionGoal(i));
if (!dependencies.empty()) {/* to prevent hang (no wake-up event) */
(co_await waitForGoals(dependencies.releaseAsArray())).value();
}
co_return co_await referencesValid();
} catch (...) {
co_return result::failure(std::current_exception());
}
kj::Promise<Result<Goal::WorkResult>> PathSubstitutionGoal::referencesValid() noexcept
try {
trace("all references realised");
if (nrFailed > 0) {
return {done(
nrNoSubstituters > 0 || nrIncompleteClosure > 0 ? ecIncompleteClosure : ecFailed,
BuildResult::DependencyFailed,
fmt("some references of path '%s' could not be realised", worker.store.printStorePath(storePath)))};
}
for (auto & i : info->references)
if (i != storePath) /* ignore self-references */
assert(worker.store.isValidPath(i));
return tryToRun();
} catch (...) {
return {std::current_exception()};
}
kj::Promise<Result<Goal::WorkResult>> PathSubstitutionGoal::tryToRun() noexcept
try {
trace("trying to run");
if (!slotToken.valid()) {
slotToken = co_await worker.substitutions.acquire();
}
maintainRunningSubstitutions = worker.runningSubstitutions.addTemporarily(1);
auto pipe = kj::newPromiseAndCrossThreadFulfiller<void>();
outPipe = kj::mv(pipe.fulfiller);
thr = std::async(std::launch::async, [this]() {
/* Wake up the worker loop when we're done. */
Finally updateStats([this]() { outPipe->fulfill(); });
auto & fetchPath = subPath ? *subPath : storePath;
try {
ReceiveInterrupts receiveInterrupts;
Activity act(*logger, actSubstitute, Logger::Fields{worker.store.printStorePath(storePath), sub->getUri()});
PushActivity pact(act.id);
copyStorePath(
*sub, worker.store, fetchPath, repair, sub->isTrusted ? NoCheckSigs : CheckSigs
);
} catch (const EndOfFile &) {
throw EndOfFile(
"NAR for '%s' fetched from '%s' is incomplete",
sub->printStorePath(fetchPath),
sub->getUri()
);
}
});
co_await pipe.promise;
co_return co_await finished();
} catch (...) {
co_return result::failure(std::current_exception());
}
kj::Promise<Result<Goal::WorkResult>> PathSubstitutionGoal::finished() noexcept
try {
trace("substitute finished");
do {
try {
slotToken = {};
thr.get();
break;
} catch (std::exception & e) {
printError(e.what());
/* Cause the parent build to fail unless --fallback is given,
or the substitute has disappeared. The latter case behaves
the same as the substitute never having existed in the
first place. */
try {
throw;
} catch (SubstituteGone &) {
} catch (...) {
substituterFailed = true;
}
}
/* Try the next substitute. */
co_return co_await tryNext();
} while (false);
worker.markContentsGood(storePath);
printMsg(lvlChatty, "substitution of path '%s' succeeded", worker.store.printStorePath(storePath));
maintainRunningSubstitutions.reset();
maintainExpectedSubstitutions.reset();
worker.doneSubstitutions++;
worker.doneDownloadSize += maintainExpectedDownload.delta();
maintainExpectedDownload.reset();
worker.doneNarSize += maintainExpectedNar.delta();
maintainExpectedNar.reset();
co_return done(ecSuccess, BuildResult::Substituted);
} catch (...) {
co_return result::failure(std::current_exception());
}
void PathSubstitutionGoal::cleanup()
{
try {
if (thr.valid()) {
// FIXME: signal worker thread to quit.
thr.get();
}
} catch (...) {
ignoreExceptionInDestructor();
}
}
}
|