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-rw-r--r--src/libstore/build.cc4
-rw-r--r--src/libstore/download.cc4
-rw-r--r--src/libstore/local-store.cc4
3 files changed, 6 insertions, 6 deletions
diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index 9c408e29c06c..59abae9b90db 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -3129,8 +3129,8 @@ void DerivationGoal::registerOutputs()
                 /* Throw an error after registering the path as
                    valid. */
                 delayedException = std::make_exception_ptr(
-                    BuildError("fixed-output derivation produced path '%s' with %s hash '%s' instead of the expected hash '%s'",
-                        dest, printHashType(h.type), printHash16or32(h2), printHash16or32(h)));
+                    BuildError("hash mismatch in fixed-output derivation '%s':\n  wanted: %s\n  got:    %s",
+                        dest, h.to_string(), h2.to_string()));
 
                 Path actualDest = worker.store.toRealPath(dest);
 
diff --git a/src/libstore/download.cc b/src/libstore/download.cc
index fef2cf7a388a..467f570bbf05 100644
--- a/src/libstore/download.cc
+++ b/src/libstore/download.cc
@@ -881,8 +881,8 @@ Path Downloader::downloadCached(ref<Store> store, const string & url_, bool unpa
         Hash gotHash = unpack
             ? hashPath(expectedHash.type, store->toRealPath(storePath)).first
             : hashFile(expectedHash.type, store->toRealPath(storePath));
-        throw nix::Error("hash mismatch in file downloaded from '%s': got hash '%s' instead of the expected hash '%s'",
-            url, gotHash.to_string(), expectedHash.to_string());
+        throw nix::Error("hash mismatch in file downloaded from '%s':\n  wanted: %s\n  got:    %s",
+            url, expectedHash.to_string(), gotHash.to_string());
     }
 
     return store->toRealPath(storePath);
diff --git a/src/libstore/local-store.cc b/src/libstore/local-store.cc
index e1cb423d151f..5b4e7ca4ca99 100644
--- a/src/libstore/local-store.cc
+++ b/src/libstore/local-store.cc
@@ -1022,11 +1022,11 @@ void LocalStore::addToStore(const ValidPathInfo & info, Source & source,
             auto hashResult = hashSink.finish();
 
             if (hashResult.first != info.narHash)
-                throw Error("hash mismatch importing path '%s'; expected hash '%s', got '%s'",
+                throw Error("hash mismatch importing path '%s';\n  wanted: %s\n  got:    %s",
                     info.path, info.narHash.to_string(), hashResult.first.to_string());
 
             if (hashResult.second != info.narSize)
-                throw Error("size mismatch importing path '%s'; expected %s, got %s",
+                throw Error("size mismatch importing path '%s';\n  wanted: %s\n  got:   %s",
                     info.path, info.narSize, hashResult.second);
 
             autoGC();