1 files changed, 46 insertions, 0 deletions
diff --git a/src/nix/app.cc b/src/nix/app.cc
new file mode 100644
index 000000000..3935297cf
--- /dev/null
+++ b/src/nix/app.cc
@@ -0,0 +1,46 @@
+#include "installables.hh"
+#include "store-api.hh"
+#include "eval-inline.hh"
+#include "eval-cache.hh"
+#include "names.hh"
+
+namespace nix {
+
+App Installable::toApp(EvalState & state)
+{
+    auto [cursor, attrPath] = getCursor(state, true);
+
+    auto type = cursor->getAttr("type")->getString();
+
+    if (type == "app") {
+        auto [program, context] = cursor->getAttr("program")->getStringWithContext();
+
+        if (!state.store->isInStore(program))
+            throw Error("app program '%s' is not in the Nix store", program);
+
+        std::vector<StorePathWithOutputs> context2;
+        for (auto & [path, name] : context)
+            context2.push_back({state.store->parseStorePath(path), {name}});
+
+        return App {
+            .context = std::move(context2),
+            .program = program,
+        };
+    }
+
+    else if (type == "derivation") {
+        auto drvPath = cursor->forceDerivation();
+        auto outPath = cursor->getAttr(state.sOutPath)->getString();
+        auto outputName = cursor->getAttr(state.sOutputName)->getString();
+        auto name = cursor->getAttr(state.sName)->getString();
+        return App {
+            .context = { { drvPath, {outputName} } },
+            .program = outPath + "/bin/" + DrvName(name).name,
+        };
+    }
+
+    else
+        throw Error("attribute '%s' has unsupported type '%s'", attrPath, type);
+}
+
+}