aboutsummaryrefslogtreecommitdiff
path: root/src/libstore/build/drv-output-substitution-goal.cc
blob: aea055624b0e2ff3b0b8d9b6f49a586922ee733a (plain)
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
#include "drv-output-substitution-goal.hh"
#include "finally.hh"
#include "worker.hh"
#include "substitution-goal.hh"
#include "signals.hh"

namespace nix {

DrvOutputSubstitutionGoal::DrvOutputSubstitutionGoal(
    const DrvOutput & id,
    Worker & worker,
    RepairFlag repair,
    std::optional<ContentAddress> ca)
    : Goal(worker, DerivedPath::Opaque { StorePath::dummy })
    , id(id)
{
    state = &DrvOutputSubstitutionGoal::init;
    name = fmt("substitution of '%s'", id.to_string());
    trace("created");
}


Goal::WorkResult DrvOutputSubstitutionGoal::init(bool inBuildSlot)
{
    trace("init");

    /* If the derivation already exists, we’re done */
    if (worker.store.queryRealisation(id)) {
        return Finished{ecSuccess};
    }

    subs = settings.useSubstitutes ? getDefaultSubstituters() : std::list<ref<Store>>();
    return tryNext(inBuildSlot);
}

Goal::WorkResult DrvOutputSubstitutionGoal::tryNext(bool inBuildSlot)
{
    trace("trying next substituter");

    if (!inBuildSlot) {
        return WaitForSlot{};
    }

    maintainRunningSubstitutions =
        std::make_unique<MaintainCount<uint64_t>>(worker.runningSubstitutions);

    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. */
        return Finished{substituterFailed ? ecFailed : ecNoSubstituters};
    }

    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>();
    downloadState->outPipe.create();

    downloadState->result =
        std::async(std::launch::async, [downloadState{downloadState}, id{id}, sub{sub}] {
            ReceiveInterrupts receiveInterrupts;
            Finally updateStats([&]() { downloadState->outPipe.writeSide.close(); });
            return sub->queryRealisation(id);
        });

    worker.childStarted(shared_from_this(), {downloadState->outPipe.readSide.get()}, true);

    state = &DrvOutputSubstitutionGoal::realisationFetched;
    return StillAlive{};
}

Goal::WorkResult DrvOutputSubstitutionGoal::realisationFetched(bool inBuildSlot)
{
    worker.childTerminated(this);
    maintainRunningSubstitutions.reset();

    try {
        outputInfo = downloadState->result.get();
    } catch (std::exception & e) {
        printError(e.what());
        substituterFailed = true;
    }

    if (!outputInfo) {
        return tryNext(inBuildSlot);
    }

    WaitForGoals result;
    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)
                );
                return tryNext(inBuildSlot);
            }
            result.goals.insert(worker.makeDrvOutputSubstitutionGoal(depId));
        }
    }

    result.goals.insert(worker.makePathSubstitutionGoal(outputInfo->outPath));

    if (result.goals.empty()) {
        return outPathValid(inBuildSlot);
    } else {
        state = &DrvOutputSubstitutionGoal::outPathValid;
        return result;
    }
}

Goal::WorkResult DrvOutputSubstitutionGoal::outPathValid(bool inBuildSlot)
{
    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 Finished{
            nrNoSubstituters > 0 || nrIncompleteClosure > 0 ? ecIncompleteClosure : ecFailed
        };
    }

    worker.store.registerDrvOutput(*outputInfo);
    return finished();
}

Goal::WorkResult DrvOutputSubstitutionGoal::finished()
{
    trace("finished");
    return Finished{ecSuccess};
}

std::string DrvOutputSubstitutionGoal::key()
{
    /* "a$" ensures substitution goals happen before derivation
       goals. */
    return "a$" + std::string(id.to_string());
}

Goal::WorkResult DrvOutputSubstitutionGoal::work(bool inBuildSlot)
{
    return (this->*state)(inBuildSlot);
}


}