1 files changed, 91 insertions, 0 deletions
diff --git a/src/libstore/machines.cc b/src/libstore/machines.cc
new file mode 100644
index 000000000000..7491037b2d79
--- /dev/null
+++ b/src/libstore/machines.cc
@@ -0,0 +1,91 @@
+#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,
+    decltype(sshPublicHostKey) sshPublicHostKey) :
+    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),
+    sshPublicHostKey(sshPublicHostKey)
+{}
+
+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);
+
+        auto isSet = [&](size_t n) {
+            return tokens.size() > n && tokens[n] != "" && tokens[n] != "-";
+        };
+
+        machines.emplace_back(tokens[0],
+            isSet(1) ? tokenizeString<std::vector<string>>(tokens[1], ",") : std::vector<string>{settings.thisSystem},
+            isSet(2) ? tokens[2] : "",
+            isSet(3) ? std::stoull(tokens[3]) : 1LL,
+            isSet(4) ? std::stoull(tokens[4]) : 1LL,
+            isSet(5) ? tokenizeString<std::set<string>>(tokens[5], ",") : std::set<string>{},
+            isSet(6) ? tokenizeString<std::set<string>>(tokens[6], ",") : std::set<string>{},
+            isSet(7) ? tokens[7] : "");
+    }
+}
+
+Machines getMachines()
+{
+    Machines machines;
+
+    for (auto & file : settings.builderFiles.get()) {
+        try {
+            parseMachines(readFile(file), machines);
+        } catch (const SysError & e) {
+            if (e.errNo != ENOENT)
+                throw;
+        }
+    }
+
+    parseMachines(settings.builders, machines);
+
+    return machines;
+}
+
+}