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Support arbitrary store URIs in nix.machines

Browse Source 
For backwards compatibility, if the URI is just a hostname, ssh://
(i.e. LegacySSHStore) is prepended automatically.

Also, all fields except the URI are now optional. For example, this is
a valid nix.machines file:

  local?root=/tmp/nix

This is useful for testing the remote build machinery since you don't
have to mess around with ssh.
This commit is contained in:
Eelco Dolstra 2017-05-01 17:35:30 +02:00
parent 3e4bdfedee
commit 031d70e500
No known key found for this signature in database
GPG Key ID: 8170B4726D7198DE
4 changed files with 66 additions and 46 deletions
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77
src/build-remote/build-remote.cc
View File

@ -27,12 +27,12 @@ class Machine {
const std::set<string> mandatoryFeatures;
public:
const string hostName;
const string storeUri;
const std::vector<string> systemTypes;
const string sshKey;
const unsigned int maxJobs;
const unsigned int speedFactor;
bool enabled;
bool enabled = true;
bool allSupported(const std::set<string> & features) const {
return std::all_of(features.begin(), features.end(),
@ -49,7 +49,7 @@ public:
});
}
Machine(decltype(hostName) hostName,
Machine(decltype(storeUri) storeUri,
decltype(systemTypes) systemTypes,
decltype(sshKey) sshKey,
decltype(maxJobs) maxJobs,
@ -58,14 +58,18 @@ public:
decltype(mandatoryFeatures) mandatoryFeatures) :
supportedFeatures(supportedFeatures),
mandatoryFeatures(mandatoryFeatures),
hostName(hostName),
storeUri(
// Backwards compatibility: if the URI is a hostname,
// prepend ssh://.
storeUri.find("://") != std::string::npos || hasPrefix(storeUri, "local") || hasPrefix(storeUri, "remote") || hasPrefix(storeUri, "auto")
? storeUri
: "ssh://" + storeUri),
systemTypes(systemTypes),
sshKey(sshKey),
maxJobs(maxJobs),
speedFactor(std::max(1U, speedFactor)),
enabled(true)
{};
};;
speedFactor(std::max(1U, speedFactor))
{}
};
static std::vector<Machine> readConf()
{
@ -87,13 +91,13 @@ static std::vector<Machine> readConf()
}
auto tokens = tokenizeString<std::vector<string>>(line);
auto sz = tokens.size();
if (sz < 4)
if (sz < 1)
throw FormatError("bad machines.conf file ‘%1%’", conf);
machines.emplace_back(tokens[0],
tokenizeString<std::vector<string>>(tokens[1], ","),
tokens[2],
stoull(tokens[3]),
sz >= 5 ? stoull(tokens[4]) : 1LL,
sz >= 2 ? tokenizeString<std::vector<string>>(tokens[1], ",") : std::vector<string>{settings.thisSystem},
sz >= 3 ? tokens[2] : "",
sz >= 4 ? std::stoull(tokens[3]) : 1LL,
sz >= 5 ? std::stoull(tokens[4]) : 1LL,
sz >= 6 ?
tokenizeString<std::set<string>>(tokens[5], ",") :
std::set<string>{},
@ -104,31 +108,27 @@ static std::vector<Machine> readConf()
return machines;
}
std::string escapeUri(std::string uri)
{
std::replace(uri.begin(), uri.end(), '/', '_');
return uri;
}
static string currentLoad;
static AutoCloseFD openSlotLock(const Machine & m, unsigned long long slot)
{
std::ostringstream fn_stream(currentLoad, std::ios_base::ate | std::ios_base::out);
fn_stream << "/";
for (auto t : m.systemTypes) {
fn_stream << t << "-";
}
fn_stream << m.hostName << "-" << slot;
return openLockFile(fn_stream.str(), true);
return openLockFile(fmt("%s/%s-%d", currentLoad, escapeUri(m.storeUri), slot), true);
}
static char display_env[] = "DISPLAY=";
static char ssh_env[] = "SSH_ASKPASS=";
int main (int argc, char * * argv)
{
return handleExceptions(argv[0], [&]() {
initNix();
/* Ensure we don't get any SSH passphrase or host key popups. */
if (putenv(display_env) == -1 ||
putenv(ssh_env) == -1)
throw SysError("setting SSH env vars");
unsetenv("DISPLAY");
unsetenv("SSH_ASKPASS");
if (argc != 5)
throw UsageError("called without required arguments");
@ -151,7 +151,7 @@ int main (int argc, char * * argv)
debug("got %d remote builders", machines.size());
string drvPath;
string hostName;
string storeUri;
for (string line; getline(cin, line);) {
auto tokens = tokenizeString<std::vector<string>>(line);
auto sz = tokens.size();
@ -178,6 +178,8 @@ int main (int argc, char * * argv)
Machine * bestMachine = nullptr;
unsigned long long bestLoad = 0;
for (auto & m : machines) {
debug("considering building on ‘%s’", m.storeUri);
if (m.enabled && std::find(m.systemTypes.begin(),
m.systemTypes.end(),
neededSystem) != m.systemTypes.end() &&
@ -238,16 +240,21 @@ int main (int argc, char * * argv)
lock = -1;
try {
sshStore = openStore("ssh-ng://" + bestMachine->hostName,
{ {"ssh-key", bestMachine->sshKey },
{"max-connections", "1" } });
hostName = bestMachine->hostName;
Store::Params storeParams{{"max-connections", "1"}};
if (bestMachine->sshKey != "")
storeParams["ssh-key"] = bestMachine->sshKey;
sshStore = openStore(bestMachine->storeUri, storeParams);
storeUri = bestMachine->storeUri;
} catch (std::exception & e) {
printError("unable to open SSH connection to ‘%s’: %s; trying other available machines...",
bestMachine->hostName, e.what());
bestMachine->storeUri, e.what());
bestMachine->enabled = false;
continue;
}
goto connected;
}
}
@ -257,11 +264,15 @@ connected:
string line;
if (!getline(cin, line))
throw Error("hook caller didn't send inputs");
auto inputs = tokenizeString<PathSet>(line);
if (!getline(cin, line))
throw Error("hook caller didn't send outputs");
auto outputs = tokenizeString<PathSet>(line);
AutoCloseFD uploadLock = openLockFile(currentLoad + "/" + hostName + ".upload-lock", true);
AutoCloseFD uploadLock = openLockFile(currentLoad + "/" + escapeUri(storeUri) + ".upload-lock", true);
auto old = signal(SIGALRM, handleAlarm);
alarm(15 * 60);
if (!lockFile(uploadLock.get(), ltWrite, true))

1
src/libstore/build.cc
View File

@ -1862,6 +1862,7 @@ void DerivationGoal::startBuilder()
dirsInChroot[i] = r;
else {
Path p = chrootRootDir + i;
debug("linking ‘%1%’ to ‘%2%’", p, r);
if (link(r.c_str(), p.c_str()) == -1) {
/* Hard-linking fails if we exceed the maximum
link count on a file (e.g. 32000 of ext3),

11
src/libstore/store-api.cc
View File

@ -709,10 +709,11 @@ namespace nix {
RegisterStoreImplementation::Implementations * RegisterStoreImplementation::implementations = 0;
ref<Store> openStore(const std::string & uri_)
ref<Store> openStore(const std::string & uri_,
const Store::Params & extraParams)
{
auto uri(uri_);
Store::Params params;
Store::Params params(extraParams);
auto q = uri.find('?');
if (q != std::string::npos) {
for (auto s : tokenizeString<Strings>(uri.substr(q + 1), "&")) {
@ -722,11 +723,7 @@ ref<Store> openStore(const std::string & uri_)
}
uri = uri_.substr(0, q);
}
return openStore(uri, params);
}
ref<Store> openStore(const std::string & uri, const Store::Params & params)
{
for (auto fun : *RegisterStoreImplementation::implementations) {
auto store = fun(uri, params);
if (store) {
@ -735,7 +732,7 @@ ref<Store> openStore(const std::string & uri, const Store::Params & params)
}
}
throw Error(format("don't know how to open Nix store ‘%s’") % uri);
throw Error("don't know how to open Nix store ‘%s’", uri);
}

23
src/libstore/store-api.hh
View File

@ -668,20 +668,31 @@ void removeTempRoots();
/* Return a Store object to access the Nix store denoted by
‘uri’ (slight misnomer...). Supported values are:
* ‘direct’: The Nix store in /nix/store and database in
* ‘local’: The Nix store in /nix/store and database in
/nix/var/nix/db, accessed directly.
* ‘daemon’: The Nix store accessed via a Unix domain socket
connection to nix-daemon.
* ‘auto’ or ‘’: Equivalent to ‘local’ or ‘daemon’ depending on
whether the user has write access to the local Nix
store/database.
* ‘file://<path>’: A binary cache stored in <path>.
If ‘uri’ is empty, it defaults to ‘direct’ or ‘daemon’ depending on
whether the user has write access to the local Nix store/database.
set to true *unless* you're going to collect garbage. */
ref<Store> openStore(const std::string & uri = getEnv("NIX_REMOTE"));
* ‘https://<path>’: A binary cache accessed via HTTP.
ref<Store> openStore(const std::string & uri, const Store::Params & params);
* ‘s3://<path>’: A writable binary cache stored on Amazon's Simple
Storage Service.
* ‘ssh://[user@]<host>’: A remote Nix store accessed by running
‘nix-store --serve’ via SSH.
You can pass parameters to the store implementation by appending
‘?key=value&key=value&...’ to the URI.
*/
ref<Store> openStore(const std::string & uri = getEnv("NIX_REMOTE"),
const Store::Params & extraParams = Store::Params());
void copyPaths(ref<Store> from, ref<Store> to, const PathSet & storePaths, bool substitute = false);