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>

tests/check-refs.nix

@@ -2,7 +2,7 @@ with import ./config.nix;
 
 rec {
 
-  dep = import ./dependencies.nix;
+  dep = import ./dependencies.nix {};
 
   makeTest = nr: args: mkDerivation ({
     name = "check-refs-" + toString nr;

tests/dependencies.nix

@@ -1,3 +1,4 @@
+{ hashInvalidator ? "" }:
 with import ./config.nix;
 
 let {
@@ -21,6 +22,17 @@ let {
     '';
   };
 
+  fod_input = mkDerivation {
+    name = "fod-input";
+    buildCommand = ''
+      echo ${hashInvalidator}
+      echo FOD > $out
+    '';
+    outputHashMode = "flat";
+    outputHashAlgo = "sha256";
+    outputHash = "1dq9p0hnm1y75q2x40fws5887bq1r840hzdxak0a9djbwvx0b16d";
+  };
+
   body = mkDerivation {
     name = "dependencies-top";
     builder = ./dependencies.builder0.sh + "/FOOBAR/../.";
@@ -29,6 +41,7 @@ let {
     input1_drv = input1;
     input2_drv = input2;
     input0_drv = input0;
+    fod_input_drv = fod_input;
     meta.description = "Random test package";
   };
 

tests/dependencies.sh

@@ -53,3 +53,20 @@ nix-store -q --referrers-closure "$input2OutPath" | grep "$outPath"
 # Check that the derivers are set properly.
 test $(nix-store -q --deriver "$outPath") = "$drvPath"
 nix-store -q --deriver "$input2OutPath" | grepQuiet -- "-input-2.drv"
+
+# --valid-derivers returns the currently single valid .drv file
+test "$(nix-store -q --valid-derivers "$outPath")" = "$drvPath"
+
+# instantiate a different drv with the same output
+drvPath2=$(nix-instantiate dependencies.nix --argstr hashInvalidator yay)
+
+# now --valid-derivers returns both
+test "$(nix-store -q --valid-derivers "$outPath" | sort)" = "$(sort <<< "$drvPath"$'\n'"$drvPath2")"
+
+# check that nix-store --valid-derivers only returns existing drv
+nix-store --delete "$drvPath"
+test "$(nix-store -q --valid-derivers "$outPath")" = "$drvPath2"
+
+# check that --valid-derivers returns nothing when there are no valid derivers
+nix-store --delete "$drvPath2"
+test -z "$(nix-store -q --valid-derivers "$outPath")"

tests/dyn-drv/eval-outputOf.sh

@@ -13,14 +13,14 @@ nix --experimental-features 'nix-command' eval --impure  --expr \
 # the future so it does work, but there are some design questions to
 # resolve first. Adding a test so we don't liberalise it by accident.
 expectStderr 1 nix --experimental-features 'nix-command dynamic-derivations' eval --impure --expr \
-    'builtins.outputOf (import ../dependencies.nix) "out"' \
+    'builtins.outputOf (import ../dependencies.nix {}) "out"' \
     | grepQuiet "value is a set while a string was expected"
 
 # Test that "DrvDeep" string contexts are not supported at this time
 #
 # Like the above, this is a restriction we could relax later.
 expectStderr 1 nix --experimental-features 'nix-command dynamic-derivations' eval --impure --expr \
-    'builtins.outputOf (import ../dependencies.nix).drvPath "out"' \
+    'builtins.outputOf (import ../dependencies.nix {}).drvPath "out"' \
     | grepQuiet "has a context which refers to a complete source and binary closure. This is not supported at this time"
 
 # Test using `builtins.outputOf` with static derivations

tests/export-graph.nix

@@ -17,13 +17,13 @@ rec {
   foo."bar.runtimeGraph" = mkDerivation {
     name = "dependencies";
     builder = builtins.toFile "build-graph-builder" "${printRefs}";
-    exportReferencesGraph = ["refs" (import ./dependencies.nix)];
+    exportReferencesGraph = ["refs" (import ./dependencies.nix {})];
   };
 
   foo."bar.buildGraph" = mkDerivation {
     name = "dependencies";
     builder = builtins.toFile "build-graph-builder" "${printRefs}";
-    exportReferencesGraph = ["refs" (import ./dependencies.nix).drvPath];
+    exportReferencesGraph = ["refs" (import ./dependencies.nix {}).drvPath];
   };
 
 }

tests/remote-store.sh

@@ -24,7 +24,7 @@ fi
   import (
     mkDerivation {
       name = "foo";
-      bla = import ./dependencies.nix;
+      bla = import ./dependencies.nix {};
       buildCommand = "
         echo \\\"hi\\\" > $out
       ";