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
|
#include "drv-output-substitution-goal.hh"
#include "build-result.hh"
#include "finally.hh"
#include "worker.hh"
#include "substitution-goal.hh"
#include "signals.hh"
#include <kj/array.h>
#include <kj/async.h>
#include <kj/vector.h>
namespace nix {
DrvOutputSubstitutionGoal::DrvOutputSubstitutionGoal(
const DrvOutput & id,
Worker & worker,
bool isDependency,
RepairFlag repair,
std::optional<ContentAddress> ca)
: Goal(worker, isDependency)
, id(id)
{
name = fmt("substitution of '%s'", id.to_string());
trace("created");
}
kj::Promise<Result<Goal::WorkResult>> DrvOutputSubstitutionGoal::workImpl() noexcept
try {
trace("init");
/* If the derivation already exists, we’re done */
if (worker.store.queryRealisation(id)) {
co_return WorkResult{ecSuccess, std::move(buildResult)};
}
subs = settings.useSubstitutes ? getDefaultSubstituters() : std::list<ref<Store>>();
co_return co_await tryNext();
} catch (...) {
co_return result::failure(std::current_exception());
}
kj::Promise<Result<Goal::WorkResult>> DrvOutputSubstitutionGoal::tryNext() noexcept
try {
trace("trying next substituter");
if (!slotToken.valid()) {
slotToken = co_await worker.substitutions.acquire();
}
maintainRunningSubstitutions = worker.runningSubstitutions.addTemporarily(1);
if (subs.size() == 0) {
/* None left. Terminate this goal and let someone else deal
with it. */
debug("derivation output '%s' is required, but there is no substituter that can provide it", id.to_string());
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 WorkResult{substituterFailed ? ecFailed : ecNoSubstituters, std::move(buildResult)};
}
sub = subs.front();
subs.pop_front();
/* The async call to a curl download below can outlive `this` (if
some other error occurs), so it must not touch `this`. So put
the shared state in a separate refcounted object. */
downloadState = std::make_shared<DownloadState>();
auto pipe = kj::newPromiseAndCrossThreadFulfiller<void>();
downloadState->outPipe = kj::mv(pipe.fulfiller);
downloadState->result =
std::async(std::launch::async, [downloadState{downloadState}, id{id}, sub{sub}] {
Finally updateStats([&]() { downloadState->outPipe->fulfill(); });
ReceiveInterrupts receiveInterrupts;
return sub->queryRealisation(id);
});
co_await pipe.promise;
co_return co_await realisationFetched();
} catch (...) {
co_return result::failure(std::current_exception());
}
kj::Promise<Result<Goal::WorkResult>> DrvOutputSubstitutionGoal::realisationFetched() noexcept
try {
maintainRunningSubstitutions.reset();
slotToken = {};
try {
outputInfo = downloadState->result.get();
} catch (std::exception & e) {
printError(e.what());
substituterFailed = true;
}
if (!outputInfo) {
co_return co_await tryNext();
}
kj::Vector<std::pair<GoalPtr, kj::Promise<Result<WorkResult>>>> dependencies;
for (const auto & [depId, depPath] : outputInfo->dependentRealisations) {
if (depId != id) {
if (auto localOutputInfo = worker.store.queryRealisation(depId);
localOutputInfo && localOutputInfo->outPath != depPath) {
warn(
"substituter '%s' has an incompatible realisation for '%s', ignoring.\n"
"Local: %s\n"
"Remote: %s",
sub->getUri(),
depId.to_string(),
worker.store.printStorePath(localOutputInfo->outPath),
worker.store.printStorePath(depPath)
);
co_return co_await tryNext();
}
dependencies.add(worker.goalFactory().makeDrvOutputSubstitutionGoal(depId));
}
}
dependencies.add(worker.goalFactory().makePathSubstitutionGoal(outputInfo->outPath));
if (!dependencies.empty()) {
(co_await waitForGoals(dependencies.releaseAsArray())).value();
}
co_return co_await outPathValid();
} catch (...) {
co_return result::failure(std::current_exception());
}
kj::Promise<Result<Goal::WorkResult>> DrvOutputSubstitutionGoal::outPathValid() noexcept
try {
assert(outputInfo);
trace("output path substituted");
if (nrFailed > 0) {
debug("The output path of the derivation output '%s' could not be substituted", id.to_string());
return {WorkResult{
nrNoSubstituters > 0 || nrIncompleteClosure > 0 ? ecIncompleteClosure : ecFailed,
std::move(buildResult),
}};
}
worker.store.registerDrvOutput(*outputInfo);
return finished();
} catch (...) {
return {std::current_exception()};
}
kj::Promise<Result<Goal::WorkResult>> DrvOutputSubstitutionGoal::finished() noexcept
try {
trace("finished");
return {WorkResult{ecSuccess, std::move(buildResult)}};
} catch (...) {
return {std::current_exception()};
}
}
|
