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distributed builds: load remote builder host key from the machines file

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This is already used by Hydra, and is very useful when materializing
a remote builder list from service discovery. This allows the service
discovery tool to only sync one file instead of two.
This commit is contained in:
Graham Christensen 2021-02-24 20:52:22 -05:00
parent 199081ad00
commit 1130b28824
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GPG key ID: FE918C3A98C1030F
6 changed files with 33 additions and 6 deletions
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16
src/libstore/ssh.cc
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@ -2,24 +2,37 @@
namespace nix {
SSHMaster::SSHMaster(const std::string & host, const std::string & keyFile, bool useMaster, bool compress, int logFD)
SSHMaster::SSHMaster(const std::string & host, const std::string & keyFile, const std::string & sshPublicHostKey, bool useMaster, bool compress, int logFD)
: host(host)
, fakeSSH(host == "localhost")
, keyFile(keyFile)
, sshPublicHostKey(sshPublicHostKey)
, useMaster(useMaster && !fakeSSH)
, compress(compress)
, logFD(logFD)
{
if (host == "" || hasPrefix(host, "-"))
throw Error("invalid SSH host name '%s'", host);
auto state(state_.lock());
state->tmpDir = std::make_unique<AutoDelete>(createTempDir("", "nix", true, true, 0700));
}
void SSHMaster::addCommonSSHOpts(Strings & args)
{
auto state(state_.lock());
for (auto & i : tokenizeString<Strings>(getEnv("NIX_SSHOPTS").value_or("")))
args.push_back(i);
if (!keyFile.empty())
args.insert(args.end(), {"-i", keyFile});
if (!sshPublicHostKey.empty()) {
Path fileName = (Path) *state->tmpDir + "/host-key";
auto p = host.rfind("@");
string thost = p != string::npos ? string(host, p + 1) : host;
writeFile(fileName, thost + " " + base64Decode(sshPublicHostKey) + "\n");
args.insert(args.end(), {"-oUserKnownHostsFile=" + fileName});
}
if (compress)
args.push_back("-C");
}
@ -87,7 +100,6 @@ Path SSHMaster::startMaster()
if (state->sshMaster != -1) return state->socketPath;
state->tmpDir = std::make_unique<AutoDelete>(createTempDir("", "nix", true, true, 0700));
state->socketPath = (Path) *state->tmpDir + "/ssh.sock";