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-rw-r--r--src/build-remote/build-remote.cc7
-rw-r--r--src/libstore/build.cc17
2 files changed, 8 insertions, 16 deletions
diff --git a/src/build-remote/build-remote.cc b/src/build-remote/build-remote.cc
index f3195f6317d9..1ee8a625b6bc 100644
--- a/src/build-remote/build-remote.cc
+++ b/src/build-remote/build-remote.cc
@@ -269,8 +269,11 @@ connected:
         copyPaths(store, ref<Store>(sshStore), inputs);
         uploadLock = -1;
 
-        printError("building ‘%s’ on ‘%s’", drvPath, hostName);
-        sshStore->buildDerivation(drvPath, readDerivation(drvPath));
+        BasicDerivation drv(readDerivation(drvPath));
+        drv.inputSrcs = inputs;
+
+        printError("building ‘%s’ on ‘%s’", drvPath, storeUri);
+        sshStore->buildDerivation(drvPath, drv);
 
         PathSet missing;
         for (auto & path : outputs)
diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index 8b869063d5e1..a0efd880400c 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -1622,23 +1622,12 @@ HookReply DerivationGoal::tryBuildHook()
     hook = std::move(worker.hook);
 
     /* Tell the hook all the inputs that have to be copied to the
-       remote system.  This unfortunately has to contain the entire
-       derivation closure to ensure that the validity invariant holds
-       on the remote system.  (I.e., it's unfortunate that we have to
-       list it since the remote system *probably* already has it.) */
-    PathSet allInputs;
-    allInputs.insert(inputPaths.begin(), inputPaths.end());
-    worker.store.computeFSClosure(drvPath, allInputs);
-
-    string s;
-    for (auto & i : allInputs) { s += i; s += ' '; }
-    writeLine(hook->toHook.writeSide.get(), s);
+       remote system. */
+    writeLine(hook->toHook.writeSide.get(), concatStringsSep(" ", inputPaths));
 
     /* Tell the hooks the missing outputs that have to be copied back
        from the remote system. */
-    s = "";
-    for (auto & i : missingPaths) { s += i; s += ' '; }
-    writeLine(hook->toHook.writeSide.get(), s);
+    writeLine(hook->toHook.writeSide.get(), concatStringsSep(" ", missingPaths));
 
     hook->toHook.writeSide = -1;