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-rw-r--r--src/libstore/build.cc7
-rw-r--r--src/libstore/store-api.hh2
2 files changed, 7 insertions, 2 deletions
diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index 5540d57a8670..5be7ce60dab9 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -3684,7 +3684,10 @@ void SubstitutionGoal::tryNext()
     /* Bail out early if this substituter lacks a valid
        signature. LocalStore::addToStore() also checks for this, but
        only after we've downloaded the path. */
-    if (worker.store.requireSigs && !info->checkSignatures(worker.store, worker.store.publicKeys)) {
+    if (worker.store.requireSigs
+        && !sub->isTrusted
+        && !info->checkSignatures(worker.store, worker.store.publicKeys))
+    {
         printInfo(format("warning: substituter '%s' does not have a valid signature for path '%s'")
             % sub->getUri() % storePath);
         tryNext();
@@ -3752,7 +3755,7 @@ void SubstitutionGoal::tryToRun()
             PushActivity pact(act.id);
 
             copyStorePath(ref<Store>(sub), ref<Store>(worker.store.shared_from_this()),
-                storePath, repair);
+                storePath, repair, sub->isTrusted ? NoCheckSigs : CheckSigs);
 
             promise.set_value();
         } catch (...) {
diff --git a/src/libstore/store-api.hh b/src/libstore/store-api.hh
index 70f23e1fcaf4..aa83c2ded8c8 100644
--- a/src/libstore/store-api.hh
+++ b/src/libstore/store-api.hh
@@ -248,6 +248,8 @@ public:
 
     const Setting<int> pathInfoCacheSize{this, 65536, "path-info-cache-size", "size of the in-memory store path information cache"};
 
+    const Setting<bool> isTrusted{this, false, "trusted", "whether paths from this store can be used as substitutes even when they lack trusted signatures"};
+
 protected:
 
     struct State