eldritch horrorsandRaito Bezarius
8e4b4c62f5
explicit stderr redirection makes mergeStderrToStdout unnecessary also. Change-Id: I63de929e6dc53f6c5ceb2d43c2ce288bfc04d872
108 lines
3.2 KiB
C++
108 lines
3.2 KiB
C++
#include "lix/libutil/current-process.hh"
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#include "lix/libutil/environment-variables.hh"
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#include "lix/libstore/ssh.hh"
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#include "lix/libutil/finally.hh"
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#include "lix/libutil/logging.hh"
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#include "lix/libutil/strings.hh"
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#include "lix/libstore/temporary-dir.hh"
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#include <unistd.h>
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namespace nix {
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SSH::SSH(const std::string & host, const std::optional<uint16_t> port, const std::string & keyFile, const std::string & sshPublicHostKey, bool compress, int logFD)
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: host(host)
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, port(port)
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, fakeSSH(host == "localhost")
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, keyFile(keyFile)
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, sshPublicHostKey(sshPublicHostKey)
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, compress(compress)
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, logFD(logFD)
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{
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if (host == "" || host.starts_with("-"))
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throw Error("invalid SSH host name '%s'", host);
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auto state(state_.lock());
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state->tmpDir = std::make_unique<AutoDelete>(createTempDir("", "nix", true, true, 0700));
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}
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void SSH::addCommonSSHOpts(Strings & args)
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{
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auto state(state_.lock());
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if (port.has_value())
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args.insert(args.end(), {"-p", std::to_string(*port)});
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for (auto & i : tokenizeString<Strings>(getEnv("NIX_SSHOPTS").value_or("")))
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args.push_back(i);
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if (!keyFile.empty())
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args.insert(args.end(), {"-i", keyFile});
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if (!sshPublicHostKey.empty()) {
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Path fileName = (Path) *state->tmpDir + "/host-key";
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auto p = host.rfind("@");
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std::string thost = p != std::string::npos ? std::string(host, p + 1) : host;
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writeFile(fileName, thost + " " + base64Decode(sshPublicHostKey) + "\n");
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args.insert(args.end(), {"-oUserKnownHostsFile=" + fileName});
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}
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if (compress)
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args.push_back("-C");
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}
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std::unique_ptr<SSH::Connection> SSH::startCommand(const std::string & command)
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{
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Pipe in, out;
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in.create();
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out.create();
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auto conn = std::make_unique<Connection>();
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ProcessOptions options;
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options.dieWithParent = false;
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std::optional<Finally<std::function<void()>>> resumeLoggerDefer;
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if (!fakeSSH) {
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logger->pause();
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resumeLoggerDefer.emplace([&]() { logger->resume(); });
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}
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conn->sshPid = startProcess([&]() {
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restoreProcessContext();
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close(in.writeSide.get());
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close(out.readSide.get());
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if (dup2(in.readSide.get(), STDIN_FILENO) == -1)
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throw SysError("duping over stdin");
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if (dup2(out.writeSide.get(), STDOUT_FILENO) == -1)
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throw SysError("duping over stdout");
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if (logFD != -1 && dup2(logFD, STDERR_FILENO) == -1)
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throw SysError("duping over stderr");
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Strings args;
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// We specifically spawn bash here, to (hopefully) get
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// reasonably POSIX-y semantics for the things we're about
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// to do next.
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if (fakeSSH) {
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args = { "bash", "-c", command };
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} else {
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args = { "ssh", host.c_str(), "-x", "-T" };
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addCommonSSHOpts(args);
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args.push_back(command);
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}
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execvp(args.begin()->c_str(), stringsToCharPtrs(args).data());
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// could not exec ssh/bash
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throw SysError("unable to execute '%s'", args.front());
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}, options);
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in.readSide.reset();
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out.writeSide.reset();
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conn->out = std::move(out.readSide);
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conn->in = std::move(in.writeSide);
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return conn;
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}
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}
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