add nix-store --query --valid-derivers command

notably useful when nix-store --query --deriver returns a non-existing
path.

Co-authored-by: Felix Uhl <iFreilicht@users.noreply.github.com>

1 files changed, 17 insertions, 1 deletions

diff --git a/src/nix-store/nix-store.cc b/src/nix-store/nix-store.cc
index 94956df66..96c3f7d7e 100644
--- a/src/nix-store/nix-store.cc
+++ b/src/nix-store/nix-store.cc
@@ -283,7 +283,7 @@ static void opQuery(Strings opFlags, Strings opArgs)
 {
     enum QueryType
         { qOutputs, qRequisites, qReferences, qReferrers
-        , qReferrersClosure, qDeriver, qBinding, qHash, qSize
+        , qReferrersClosure, qDeriver, qValidDerivers, qBinding, qHash, qSize
         , qTree, qGraph, qGraphML, qResolve, qRoots };
     std::optional<QueryType> query;
     bool useOutput = false;
@@ -299,6 +299,7 @@ static void opQuery(Strings opFlags, Strings opArgs)
         else if (i == "--referrers" || i == "--referers") query = qReferrers;
         else if (i == "--referrers-closure" || i == "--referers-closure") query = qReferrersClosure;
         else if (i == "--deriver" || i == "-d") query = qDeriver;
+        else if (i == "--valid-derivers") query = qValidDerivers;
         else if (i == "--binding" || i == "-b") {
             if (opArgs.size() == 0)
                 throw UsageError("expected binding name");
@@ -372,6 +373,21 @@ static void opQuery(Strings opFlags, Strings opArgs)
             }
             break;
 
+        case qValidDerivers: {
+            StorePathSet result;
+            for (auto & i : opArgs) {
+                auto derivers = store->queryValidDerivers(store->followLinksToStorePath(i));
+                for (const auto &i: derivers) {
+                    result.insert(i);
+                }
+            }
+            auto sorted = store->topoSortPaths(result);
+            for (StorePaths::reverse_iterator i = sorted.rbegin();
+                 i != sorted.rend(); ++i)
+                cout << fmt("%s\n", store->printStorePath(*i));
+            break;
+        }
+
         case qBinding:
             for (auto & i : opArgs) {
                 auto path = useDeriver(store->followLinksToStorePath(i));