diff --git a/lix/libfetchers/path.cc b/lix/libfetchers/path.cc
index a6d717528..e46f32ec1 100644
--- a/lix/libfetchers/path.cc
+++ b/lix/libfetchers/path.cc
@@ -133,7 +133,7 @@ struct PathInputScheme : InputScheme
         if (!storePath || storePath->name() != "source" || !store->isValidPath(*storePath)) {
             // FIXME: try to substitute storePath.
             auto src = GeneratorSource{dumpPathAndGetMtime(absPath, mtime, defaultPathFilter)};
-            storePath = store->addToStoreFromDump(src, "source");
+            storePath = TRY_AWAIT(store->addToStoreFromDump(src, "source"));
         }
         input.attrs.insert_or_assign("lastModified", uint64_t(mtime));
 
diff --git a/lix/libstore/binary-cache-store.cc b/lix/libstore/binary-cache-store.cc
index ccdd28cd0..01385b2a4 100644
--- a/lix/libstore/binary-cache-store.cc
+++ b/lix/libstore/binary-cache-store.cc
@@ -277,12 +277,12 @@ try {
     co_return result::current_exception();
 }
 
-StorePath BinaryCacheStore::addToStoreFromDump(Source & dump, std::string_view name,
+kj::Promise<Result<StorePath>> BinaryCacheStore::addToStoreFromDump(Source & dump, std::string_view name,
     FileIngestionMethod method, HashType hashAlgo, RepairFlag repair, const StorePathSet & references)
-{
+try {
     if (method != FileIngestionMethod::Recursive || hashAlgo != HashType::SHA256)
         unsupported("addToStoreFromDump");
-    return addToStoreCommon(dump, repair, CheckSigs, [&](HashResult nar) {
+    co_return addToStoreCommon(dump, repair, CheckSigs, [&](HashResult nar) {
         ValidPathInfo info {
             *this,
             name,
@@ -300,6 +300,8 @@ StorePath BinaryCacheStore::addToStoreFromDump(Source & dump, std::string_view n
         info.narSize = nar.second;
         return info;
     })->path;
+} catch (...) {
+    co_return result::current_exception();
 }
 
 bool BinaryCacheStore::isValidPathUncached(const StorePath & storePath)
diff --git a/lix/libstore/binary-cache-store.hh b/lix/libstore/binary-cache-store.hh
index 8381e24e1..daa923143 100644
--- a/lix/libstore/binary-cache-store.hh
+++ b/lix/libstore/binary-cache-store.hh
@@ -116,7 +116,7 @@ public:
     kj::Promise<Result<void>> addToStore(const ValidPathInfo & info, Source & narSource,
         RepairFlag repair, CheckSigsFlag checkSigs) override;
 
-    StorePath addToStoreFromDump(Source & dump, std::string_view name,
+    kj::Promise<Result<StorePath>> addToStoreFromDump(Source & dump, std::string_view name,
         FileIngestionMethod method, HashType hashAlgo, RepairFlag repair, const StorePathSet & references) override;
 
     kj::Promise<Result<StorePath>> addToStore(
diff --git a/lix/libstore/build/local-derivation-goal.cc b/lix/libstore/build/local-derivation-goal.cc
index 964667ca7..3e08c102a 100644
--- a/lix/libstore/build/local-derivation-goal.cc
+++ b/lix/libstore/build/local-derivation-goal.cc
@@ -1080,17 +1080,19 @@ struct RestrictedStore : public virtual IndirectRootStore, public virtual GcStor
         return path;
     }
 
-    StorePath addToStoreFromDump(
+    kj::Promise<Result<StorePath>> addToStoreFromDump(
         Source & dump,
         std::string_view name,
         FileIngestionMethod method,
         HashType hashAlgo,
         RepairFlag repair,
         const StorePathSet & references) override
-    {
-        auto path = next->addToStoreFromDump(dump, name, method, hashAlgo, repair, references);
+    try {
+        auto path = TRY_AWAIT(next->addToStoreFromDump(dump, name, method, hashAlgo, repair, references));
         goal.addDependency(path);
-        return path;
+        co_return path;
+    } catch (...) {
+        co_return result::current_exception();
     }
 
     box_ptr<Source> narFromPath(const StorePath & path) override
diff --git a/lix/libstore/daemon.cc b/lix/libstore/daemon.cc
index ef779a630..491d38550 100644
--- a/lix/libstore/daemon.cc
+++ b/lix/libstore/daemon.cc
@@ -427,7 +427,7 @@ static void performOp(AsyncIoRoot & aio, TunnelLogger * logger, ref<Store> store
                         return store->queryPathInfo(path);
                     },
                     [&](const FileIngestionMethod & fim) {
-                        auto path = store->addToStoreFromDump(source, name, fim, hashType, repair, refs);
+                        auto path = aio.blockOn(store->addToStoreFromDump(source, name, fim, hashType, repair, refs));
                         return store->queryPathInfo(path);
                     },
                 }, contentAddressMethod.raw);
@@ -498,7 +498,7 @@ static void performOp(AsyncIoRoot & aio, TunnelLogger * logger, ref<Store> store
             };
             GeneratorSource dumpSource{g()};
             logger->startWork();
-            auto path = store->addToStoreFromDump(dumpSource, baseName, method, hashAlgo);
+            auto path = aio.blockOn(store->addToStoreFromDump(dumpSource, baseName, method, hashAlgo));
             logger->stopWork();
 
             to << store->printStorePath(path);
diff --git a/lix/libstore/local-store.cc b/lix/libstore/local-store.cc
index 95f5f986a..919efbfc7 100644
--- a/lix/libstore/local-store.cc
+++ b/lix/libstore/local-store.cc
@@ -1281,9 +1281,9 @@ try {
 }
 
 
-StorePath LocalStore::addToStoreFromDump(Source & source0, std::string_view name,
+kj::Promise<Result<StorePath>> LocalStore::addToStoreFromDump(Source & source0, std::string_view name,
     FileIngestionMethod method, HashType hashAlgo, RepairFlag repair, const StorePathSet & references)
-{
+try {
     /* For computing the store path. */
     auto hashSink = std::make_unique<HashSink>(hashAlgo);
     TeeSource source { source0, *hashSink };
@@ -1419,7 +1419,9 @@ StorePath LocalStore::addToStoreFromDump(Source & source0, std::string_view name
         }
     }
 
-    return dstPath;
+    co_return dstPath;
+} catch (...) {
+    co_return result::current_exception();
 }
 
 
diff --git a/lix/libstore/local-store.hh b/lix/libstore/local-store.hh
index bab56600e..e3c185715 100644
--- a/lix/libstore/local-store.hh
+++ b/lix/libstore/local-store.hh
@@ -207,7 +207,7 @@ public:
     kj::Promise<Result<void>> addToStore(const ValidPathInfo & info, Source & source,
         RepairFlag repair, CheckSigsFlag checkSigs) override;
 
-    StorePath addToStoreFromDump(Source & dump, std::string_view name,
+    kj::Promise<Result<StorePath>> addToStoreFromDump(Source & dump, std::string_view name,
         FileIngestionMethod method, HashType hashAlgo, RepairFlag repair, const StorePathSet & references) override;
 
     StorePath addTextToStore(
diff --git a/lix/libstore/remote-store.cc b/lix/libstore/remote-store.cc
index 057b13c58..4e6909762 100644
--- a/lix/libstore/remote-store.cc
+++ b/lix/libstore/remote-store.cc
@@ -458,10 +458,12 @@ ref<const ValidPathInfo> RemoteStore::addCAToStore(
 }
 
 
-StorePath RemoteStore::addToStoreFromDump(Source & dump, std::string_view name,
+kj::Promise<Result<StorePath>> RemoteStore::addToStoreFromDump(Source & dump, std::string_view name,
       FileIngestionMethod method, HashType hashType, RepairFlag repair, const StorePathSet & references)
-{
-    return addCAToStore(dump, name, method, hashType, references, repair)->path;
+try {
+    co_return addCAToStore(dump, name, method, hashType, references, repair)->path;
+} catch (...) {
+    co_return result::current_exception();
 }
 
 
diff --git a/lix/libstore/remote-store.hh b/lix/libstore/remote-store.hh
index 2faa29b11..af3fa82bb 100644
--- a/lix/libstore/remote-store.hh
+++ b/lix/libstore/remote-store.hh
@@ -85,7 +85,7 @@ public:
     /**
      * Add a content-addressable store path. Does not support references. `dump` will be drained.
      */
-    StorePath addToStoreFromDump(Source & dump, std::string_view name,
+    kj::Promise<Result<StorePath>> addToStoreFromDump(Source & dump, std::string_view name,
         FileIngestionMethod method = FileIngestionMethod::Recursive, HashType hashAlgo = HashType::SHA256, RepairFlag repair = NoRepair, const StorePathSet & references = StorePathSet()) override;
 
     kj::Promise<Result<void>> addToStore(const ValidPathInfo & info, Source & nar,
diff --git a/lix/libstore/store-api.cc b/lix/libstore/store-api.cc
index b130ff26d..c36a94e8f 100644
--- a/lix/libstore/store-api.cc
+++ b/lix/libstore/store-api.cc
@@ -283,7 +283,7 @@ try {
         method == FileIngestionMethod::Recursive ? dumpPath(srcPath, filter).decay()
                                                  : readFileSource(srcPath)
     };
-    co_return addToStoreFromDump(source, name, method, hashAlgo, repair, references);
+    co_return TRY_AWAIT(addToStoreFromDump(source, name, method, hashAlgo, repair, references));
 } catch (...) {
     co_return result::current_exception();
 }
diff --git a/lix/libstore/store-api.hh b/lix/libstore/store-api.hh
index 5175d0de8..f5399c2d8 100644
--- a/lix/libstore/store-api.hh
+++ b/lix/libstore/store-api.hh
@@ -554,10 +554,10 @@ public:
      *
      * \todo remove?
      */
-    virtual StorePath addToStoreFromDump(Source & dump, std::string_view name,
+    virtual kj::Promise<Result<StorePath>> addToStoreFromDump(Source & dump, std::string_view name,
         FileIngestionMethod method = FileIngestionMethod::Recursive, HashType hashAlgo = HashType::SHA256, RepairFlag repair = NoRepair,
         const StorePathSet & references = StorePathSet())
-    { unsupported("addToStoreFromDump"); }
+    try { unsupported("addToStoreFromDump"); } catch (...) { return {result::current_exception()}; }
 
     /**
      * Like addToStore, but the contents written to the output path is a