about summary refs log tree commit diff
path: root/src/libstore/legacy-ssh-store.cc
blob: a6479a450e345db3d90ed52212b7c326ea2b402c (plain) (blame)
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
#include "archive.hh"
#include "pool.hh"
#include "remote-store.hh"
#include "serve-protocol.hh"
#include "store-api.hh"
#include "worker-protocol.hh"
#include "ssh.hh"
#include "derivations.hh"

namespace nix {

static std::string uriScheme = "ssh://";

struct LegacySSHStore : public Store
{
    const Setting<int> maxConnections{this, 1, "max-connections", "maximum number of concurrent SSH connections"};
    const Setting<Path> sshKey{this, "", "ssh-key", "path to an SSH private key"};
    const Setting<bool> compress{this, false, "compress", "whether to compress the connection"};

    // Hack for getting remote build log output.
    const Setting<int> logFD{this, -1, "log-fd", "file descriptor to which SSH's stderr is connected"};

    struct Connection
    {
        std::unique_ptr<SSHMaster::Connection> sshConn;
        FdSink to;
        FdSource from;
        int remoteVersion;
    };

    std::string host;

    ref<Pool<Connection>> connections;

    SSHMaster master;

    LegacySSHStore(const string & host, const Params & params)
        : Store(params)
        , host(host)
        , connections(make_ref<Pool<Connection>>(
            std::max(1, (int) maxConnections),
            [this]() { return openConnection(); },
            [](const ref<Connection> & r) { return true; }
            ))
        , master(
            host,
            sshKey,
            // Use SSH master only if using more than 1 connection.
            connections->capacity() > 1,
            compress,
            logFD)
    {
    }

    ref<Connection> openConnection()
    {
        auto conn = make_ref<Connection>();
        conn->sshConn = master.startCommand("nix-store --serve --write");
        conn->to = FdSink(conn->sshConn->in.get());
        conn->from = FdSource(conn->sshConn->out.get());

        try {
            conn->to << SERVE_MAGIC_1 << SERVE_PROTOCOL_VERSION;
            conn->to.flush();

            unsigned int magic = readInt(conn->from);
            if (magic != SERVE_MAGIC_2)
                throw Error("protocol mismatch with ‘nix-store --serve’ on ‘%s’", host);
            conn->remoteVersion = readInt(conn->from);
            if (GET_PROTOCOL_MAJOR(conn->remoteVersion) != 0x200)
                throw Error("unsupported ‘nix-store --serve’ protocol version on ‘%s’", host);

        } catch (EndOfFile & e) {
            throw Error("cannot connect to ‘%1%’", host);
        }

        return conn;
    };

    string getUri() override
    {
        return uriScheme + host;
    }

    void queryPathInfoUncached(const Path & path,
        std::function<void(std::shared_ptr<ValidPathInfo>)> success,
        std::function<void(std::exception_ptr exc)> failure) override
    {
        sync2async<std::shared_ptr<ValidPathInfo>>(success, failure, [&]() -> std::shared_ptr<ValidPathInfo> {
            auto conn(connections->get());

            debug("querying remote host ‘%s’ for info on ‘%s’", host, path);

            conn->to << cmdQueryPathInfos << PathSet{path};
            conn->to.flush();

            auto info = std::make_shared<ValidPathInfo>();
            conn->from >> info->path;
            if (info->path.empty()) return nullptr;
            assert(path == info->path);

            PathSet references;
            conn->from >> info->deriver;
            info->references = readStorePaths<PathSet>(*this, conn->from);
            readLongLong(conn->from); // download size
            info->narSize = readLongLong(conn->from);

            auto s = readString(conn->from);
            assert(s == "");

            return info;
        });
    }

    void addToStore(const ValidPathInfo & info, const ref<std::string> & nar,
        bool repair, bool dontCheckSigs,
        std::shared_ptr<FSAccessor> accessor) override
    {
        debug("adding path ‘%s’ to remote host ‘%s’", info.path, host);

        auto conn(connections->get());

        conn->to
            << cmdImportPaths
            << 1;
        conn->to(*nar);
        conn->to
            << exportMagic
            << info.path
            << info.references
            << info.deriver
            << 0
            << 0;
        conn->to.flush();

        if (readInt(conn->from) != 1)
            throw Error("failed to add path ‘%s’ to remote host ‘%s’, info.path, host");

    }

    void narFromPath(const Path & path, Sink & sink) override
    {
        auto conn(connections->get());

        conn->to << cmdDumpStorePath << path;
        conn->to.flush();

        /* FIXME: inefficient. */
        ParseSink parseSink; /* null sink; just parse the NAR */
        TeeSource savedNAR(conn->from);
        parseDump(parseSink, savedNAR);
        sink(*savedNAR.data);
    }

    PathSet queryAllValidPaths() override { unsupported(); }

    void queryReferrers(const Path & path, PathSet & referrers) override
    { unsupported(); }

    PathSet queryDerivationOutputs(const Path & path) override
    { unsupported(); }

    StringSet queryDerivationOutputNames(const Path & path) override
    { unsupported(); }

    Path queryPathFromHashPart(const string & hashPart) override
    { unsupported(); }

    Path addToStore(const string & name, const Path & srcPath,
        bool recursive, HashType hashAlgo,
        PathFilter & filter, bool repair) override
    { unsupported(); }

    Path addTextToStore(const string & name, const string & s,
        const PathSet & references, bool repair) override
    { unsupported(); }

    BuildResult buildDerivation(const Path & drvPath, const BasicDerivation & drv,
        BuildMode buildMode) override
    {
        auto conn(connections->get());

        conn->to
            << cmdBuildDerivation
            << drvPath
            << drv
            << settings.maxSilentTime
            << settings.buildTimeout;
        if (GET_PROTOCOL_MINOR(conn->remoteVersion) >= 2)
            conn->to
                << settings.maxLogSize;
        if (GET_PROTOCOL_MINOR(conn->remoteVersion) >= 3)
            conn->to
                << settings.buildRepeat
                << settings.enforceDeterminism;

        conn->to.flush();

        BuildResult status;
        status.status = (BuildResult::Status) readInt(conn->from);
        conn->from >> status.errorMsg;

        if (GET_PROTOCOL_MINOR(conn->remoteVersion) >= 3)
            conn->from >> status.timesBuilt >> status.isNonDeterministic >> status.startTime >> status.stopTime;

        return status;
    }

    void ensurePath(const Path & path) override
    { unsupported(); }

    void addTempRoot(const Path & path) override
    { unsupported(); }

    void addIndirectRoot(const Path & path) override
    { unsupported(); }

    Roots findRoots() override
    { unsupported(); }

    void collectGarbage(const GCOptions & options, GCResults & results) override
    { unsupported(); }

    ref<FSAccessor> getFSAccessor() override
    { unsupported(); }

    void addSignatures(const Path & storePath, const StringSet & sigs) override
    { unsupported(); }

    void computeFSClosure(const PathSet & paths,
        PathSet & out, bool flipDirection = false,
        bool includeOutputs = false, bool includeDerivers = false) override
    {
        if (flipDirection || includeDerivers) {
            Store::computeFSClosure(paths, out, flipDirection, includeOutputs, includeDerivers);
            return;
        }

        auto conn(connections->get());

        conn->to
            << cmdQueryClosure
            << includeOutputs
            << paths;
        conn->to.flush();

        auto res = readStorePaths<PathSet>(*this, conn->from);

        out.insert(res.begin(), res.end());
    }

    PathSet queryValidPaths(const PathSet & paths, bool maybeSubstitute = false) override
    {
        auto conn(connections->get());

        conn->to
            << cmdQueryValidPaths
            << false // lock
            << maybeSubstitute
            << paths;
        conn->to.flush();

        return readStorePaths<PathSet>(*this, conn->from);
    }
};

static RegisterStoreImplementation regStore([](
    const std::string & uri, const Store::Params & params)
    -> std::shared_ptr<Store>
{
    if (std::string(uri, 0, uriScheme.size()) != uriScheme) return 0;
    return std::make_shared<LegacySSHStore>(std::string(uri, uriScheme.size()), params);
});

}