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build-remote: Ugly hackery to get build logs to work

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The build hook mechanism expects build log output to go to file
descriptor 4, so do that.
This commit is contained in:
Eelco Dolstra 2017-05-02 12:01:46 +02:00
parent 3a5f04f48c
commit feefcb3a98
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GPG key ID: 8170B4726D7198DE
4 changed files with 11 additions and 3 deletions
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2
src/build-remote/build-remote.cc
View file

@ -241,7 +241,7 @@ int main (int argc, char * * argv)
try { try {
Store::Params storeParams{{"max-connections", "1"}}; Store::Params storeParams{{"max-connections", "1"}, {"log-fd", "4"}};
if (bestMachine->sshKey != "") if (bestMachine->sshKey != "")
storeParams["ssh-key"] = bestMachine->sshKey; storeParams["ssh-key"] = bestMachine->sshKey;

6
src/libstore/legacy-ssh-store.cc
View file

@ -17,6 +17,9 @@ struct LegacySSHStore : public Store
const Setting<Path> sshKey{this, "", "ssh-key", "path to an SSH private key"}; 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"}; 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 struct Connection
{ {
std::unique_ptr<SSHMaster::Connection> sshConn; std::unique_ptr<SSHMaster::Connection> sshConn;
@ -44,7 +47,8 @@ struct LegacySSHStore : public Store
sshKey, sshKey,
// Use SSH master only if using more than 1 connection. // Use SSH master only if using more than 1 connection.
connections->capacity() > 1, connections->capacity() > 1,
compress) compress,
logFD)
{ {
} }

2
src/libstore/ssh.cc
View file

@ -31,6 +31,8 @@ std::unique_ptr<SSHMaster::Connection> SSHMaster::startCommand(const std::string
throw SysError("duping over stdin"); throw SysError("duping over stdin");
if (dup2(out.writeSide.get(), STDOUT_FILENO) == -1) if (dup2(out.writeSide.get(), STDOUT_FILENO) == -1)
throw SysError("duping over stdout"); throw SysError("duping over stdout");
if (logFD != -1 && dup2(logFD, STDERR_FILENO) == -1)
throw SysError("duping over stderr");
Strings args = { "ssh", host.c_str(), "-x", "-a" }; Strings args = { "ssh", host.c_str(), "-x", "-a" };
addCommonSSHOpts(args); addCommonSSHOpts(args);

4
src/libstore/ssh.hh
View file

@ -13,6 +13,7 @@ private:
const std::string keyFile; const std::string keyFile;
const bool useMaster; const bool useMaster;
const bool compress; const bool compress;
const int logFD;
struct State struct State
{ {
@ -27,11 +28,12 @@ private:
public: public:
SSHMaster(const std::string & host, const std::string & keyFile, bool useMaster, bool compress) SSHMaster(const std::string & host, const std::string & keyFile, bool useMaster, bool compress, int logFD = -1)
: host(host) : host(host)
, keyFile(keyFile) , keyFile(keyFile)
, useMaster(useMaster) , useMaster(useMaster)
, compress(compress) , compress(compress)
, logFD(logFD)
{ {
} }