Factor out machines.conf parsing

This allows hydra-queue-runner to use it.

2 files changed, 100 insertions, 0 deletions

diff --git a/src/libstore/machines.cc b/src/libstore/machines.cc
new file mode 100644
index 000000000..471ce8efb
--- /dev/null
+++ b/src/libstore/machines.cc
@@ -0,0 +1,65 @@
+#include "machines.hh"
+#include "util.hh"
+#include "globals.hh"
+
+#include <algorithm>
+
+namespace nix {
+
+Machine::Machine(decltype(storeUri) storeUri,
+    decltype(systemTypes) systemTypes,
+    decltype(sshKey) sshKey,
+    decltype(maxJobs) maxJobs,
+    decltype(speedFactor) speedFactor,
+    decltype(supportedFeatures) supportedFeatures,
+    decltype(mandatoryFeatures) mandatoryFeatures) :
+    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)),
+    supportedFeatures(supportedFeatures),
+    mandatoryFeatures(mandatoryFeatures)
+{}
+
+bool Machine::allSupported(const std::set<string> & features) const {
+    return std::all_of(features.begin(), features.end(),
+        [&](const string & feature) {
+            return supportedFeatures.count(feature) ||
+                mandatoryFeatures.count(feature);
+        });
+}
+
+bool Machine::mandatoryMet(const std::set<string> & features) const {
+    return std::all_of(mandatoryFeatures.begin(), mandatoryFeatures.end(),
+        [&](const string & feature) {
+            return features.count(feature);
+        });
+}
+
+void parseMachines(const std::string & s, Machines & machines)
+{
+    for (auto line : tokenizeString<std::vector<string>>(s, "\n")) {
+        chomp(line);
+        line.erase(std::find(line.begin(), line.end(), '#'), line.end());
+        if (line.empty()) continue;
+        auto tokens = tokenizeString<std::vector<string>>(line);
+        auto sz = tokens.size();
+        if (sz < 1)
+            throw FormatError("bad machine specification ‘%s’", line);
+        machines.emplace_back(tokens[0],
+            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>{},
+            sz >= 7 ? tokenizeString<std::set<string>>(tokens[6], ",") : std::set<string>{});
+    }
+}
+
+}
diff --git a/src/libstore/machines.hh b/src/libstore/machines.hh
new file mode 100644
index 000000000..96c4bd81a
--- /dev/null
+++ b/src/libstore/machines.hh
@@ -0,0 +1,35 @@
+#pragma once
+
+#include "types.hh"
+
+namespace nix {
+
+struct Machine {
+
+    const string storeUri;
+    const std::vector<string> systemTypes;
+    const string sshKey;
+    const unsigned int maxJobs;
+    const unsigned int speedFactor;
+    const std::set<string> supportedFeatures;
+    const std::set<string> mandatoryFeatures;
+    bool enabled = true;
+
+    bool allSupported(const std::set<string> & features) const;
+
+    bool mandatoryMet(const std::set<string> & features) const;
+
+    Machine(decltype(storeUri) storeUri,
+        decltype(systemTypes) systemTypes,
+        decltype(sshKey) sshKey,
+        decltype(maxJobs) maxJobs,
+        decltype(speedFactor) speedFactor,
+        decltype(supportedFeatures) supportedFeatures,
+        decltype(mandatoryFeatures) mandatoryFeatures);
+};
+
+typedef std::vector<Machine> Machines;
+
+void parseMachines(const std::string & s, Machines & machines);
+
+}