3 files changed, 13 insertions, 2 deletions
diff --git a/src/libstore/daemon.cc b/src/libstore/daemon.cc
index 4cf67064a..2ff53c964 100644
--- a/src/libstore/daemon.cc
+++ b/src/libstore/daemon.cc
@@ -474,7 +474,7 @@ static void performOp(TunnelLogger * logger, ref<Store> store,
     case wopBuildDerivation: {
         auto drvPath = store->parseStorePath(readString(from));
         BasicDerivation drv;
-        readDerivation(from, *store, drv, std::string(drvPath.name()));
+        readDerivation(from, *store, drv, Derivation::nameFromPath(drvPath));
         BuildMode buildMode = (BuildMode) readInt(from);
         logger->startWork();
         if (!trusted)
diff --git a/src/libstore/derivations.cc b/src/libstore/derivations.cc
index 97fd21885..a85a70c0a 100644
--- a/src/libstore/derivations.cc
+++ b/src/libstore/derivations.cc
@@ -218,7 +218,7 @@ Derivation Store::readDerivation(const StorePath & drvPath)
 {
     auto accessor = getFSAccessor();
     try {
-        return parseDerivation(*this, accessor->readFile(printStorePath(drvPath)), std::string(drvPath.name()));
+        return parseDerivation(*this, accessor->readFile(printStorePath(drvPath)), Derivation::nameFromPath(drvPath));
     } catch (FormatError & e) {
         throw Error("error parsing derivation '%s': %s", printStorePath(drvPath), e.msg());
     }
@@ -465,6 +465,15 @@ StringSet BasicDerivation::outputNames() const
 }
 
 
+std::string_view BasicDerivation::nameFromPath(const StorePath & drvPath) {
+    auto nameWithSuffix = drvPath.name();
+    constexpr std::string_view extension = ".drv";
+    assert(hasSuffix(nameWithSuffix, extension));
+    nameWithSuffix.remove_suffix(extension.size());
+    return nameWithSuffix;
+}
+
+
 Source & readDerivation(Source & in, const Store & store, BasicDerivation & drv, std::string_view name)
 {
     drv.name = name;
diff --git a/src/libstore/derivations.hh b/src/libstore/derivations.hh
index 81c196ff7..6d3b54d3f 100644
--- a/src/libstore/derivations.hh
+++ b/src/libstore/derivations.hh
@@ -64,6 +64,8 @@ struct BasicDerivation
 
     /* Return the output names of a derivation. */
     StringSet outputNames() const;
+
+    static std::string_view nameFromPath(const StorePath & storePath);
 };
 
 struct Derivation : BasicDerivation