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Merge pull request #1189 from NixOS/fix-hang

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openConnection(): Don't throw exceptions in forked child
This commit is contained in:
Graham Christensen 2022-03-30 17:16:02 -04:00 committed by GitHub
commit 84f54cb011
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 23 additions and 25 deletions
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48
src/hydra-queue-runner/build-remote.cc
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@ -55,8 +55,30 @@ static void openConnection(Machine::ptr machine, Path tmpDir, int stderrFD, Chil
to.create();
from.create();
child.pid = startProcess([&]() {
Strings argv;
if (machine->isLocalhost()) {
pgmName = "nix-store";
argv = {"nix-store", "--builders", "", "--serve", "--write"};
} else {
pgmName = "ssh";
auto sshName = machine->sshName;
Strings extraArgs = extraStoreArgs(sshName);
argv = {"ssh", sshName};
if (machine->sshKey != "") append(argv, {"-i", machine->sshKey});
if (machine->sshPublicHostKey != "") {
Path fileName = tmpDir + "/host-key";
auto p = machine->sshName.find("@");
std::string host = p != std::string::npos ? std::string(machine->sshName, p + 1) : machine->sshName;
writeFile(fileName, host + " " + machine->sshPublicHostKey + "\n");
append(argv, {"-oUserKnownHostsFile=" + fileName});
}
append(argv,
{ "-x", "-a", "-oBatchMode=yes", "-oConnectTimeout=60", "-oTCPKeepAlive=yes"
, "--", "nix-store", "--serve", "--write" });
append(argv, extraArgs);
}
child.pid = startProcess([&]() {
restoreProcessContext();
if (dup2(to.readSide.get(), STDIN_FILENO) == -1)
@ -68,30 +90,6 @@ static void openConnection(Machine::ptr machine, Path tmpDir, int stderrFD, Chil
if (dup2(stderrFD, STDERR_FILENO) == -1)
throw SysError("cannot dup stderr");
Strings argv;
if (machine->isLocalhost()) {
pgmName = "nix-store";
argv = {"nix-store", "--builders", "", "--serve", "--write"};
}
else {
pgmName = "ssh";
auto sshName = machine->sshName;
Strings extraArgs = extraStoreArgs(sshName);
argv = {"ssh", sshName};
if (machine->sshKey != "") append(argv, {"-i", machine->sshKey});
if (machine->sshPublicHostKey != "") {
Path fileName = tmpDir + "/host-key";
auto p = machine->sshName.find("@");
std::string host = p != std::string::npos ? std::string(machine->sshName, p + 1) : machine->sshName;
writeFile(fileName, host + " " + machine->sshPublicHostKey + "\n");
append(argv, {"-oUserKnownHostsFile=" + fileName});
}
append(argv,
{ "-x", "-a", "-oBatchMode=yes", "-oConnectTimeout=60", "-oTCPKeepAlive=yes"
, "--", "nix-store", "--serve", "--write" });
append(argv, extraArgs);
}
execvp(argv.front().c_str(), (char * *) stringsToCharPtrs(argv).data()); // FIXME: remove cast
throw SysError("cannot start %s", pgmName);