2 files changed, 81 insertions, 0 deletions

diff --git a/tests/build.sh b/tests/build.sh
index fc6825e25..c7db039b4 100644
--- a/tests/build.sh
+++ b/tests/build.sh
@@ -70,3 +70,54 @@ testNormalization () {
 }
 
 testNormalization
+
+# https://github.com/NixOS/nix/issues/6572
+issue_6572_independent_outputs() {
+    nix build -f multiple-outputs.nix --json independent --no-link > $TEST_ROOT/independent.json
+
+    # Make sure that 'nix build' can build a derivation that depends on both outputs of another derivation.
+    p=$(nix build -f multiple-outputs.nix use-independent --no-link --print-out-paths)
+    nix-store --delete "$p" # Clean up for next test
+
+    # Make sure that 'nix build' tracks input-outputs correctly when a single output is already present.
+    nix-store --delete "$(jq -r <$TEST_ROOT/independent.json .[0].outputs.first)"
+    p=$(nix build -f multiple-outputs.nix use-independent --no-link --print-out-paths)
+    cmp $p <<EOF
+first
+second
+EOF
+    nix-store --delete "$p" # Clean up for next test
+
+    # Make sure that 'nix build' tracks input-outputs correctly when a single output is already present.
+    nix-store --delete "$(jq -r <$TEST_ROOT/independent.json .[0].outputs.second)"
+    p=$(nix build -f multiple-outputs.nix use-independent --no-link --print-out-paths)
+    cmp $p <<EOF
+first
+second
+EOF
+    nix-store --delete "$p" # Clean up for next test
+}
+issue_6572_independent_outputs
+
+
+# https://github.com/NixOS/nix/issues/6572
+issue_6572_dependent_outputs() {
+
+    nix build -f multiple-outputs.nix --json a --no-link > $TEST_ROOT/a.json
+
+    # # Make sure that 'nix build' can build a derivation that depends on both outputs of another derivation.
+    p=$(nix build -f multiple-outputs.nix use-a --no-link --print-out-paths)
+    nix-store --delete "$p" # Clean up for next test
+
+    # Make sure that 'nix build' tracks input-outputs correctly when a single output is already present.
+    nix-store --delete "$(jq -r <$TEST_ROOT/a.json .[0].outputs.second)"
+    p=$(nix build -f multiple-outputs.nix use-a --no-link --print-out-paths)
+    cmp $p <<EOF
+first
+second
+EOF
+    nix-store --delete "$p" # Clean up for next test
+}
+if isDaemonNewer "2.12pre0"; then
+    issue_6572_dependent_outputs
+fi
diff --git a/tests/multiple-outputs.nix b/tests/multiple-outputs.nix
index 624a5dade..1429bc648 100644
--- a/tests/multiple-outputs.nix
+++ b/tests/multiple-outputs.nix
@@ -31,6 +31,15 @@ rec {
     helloString = "Hello, world!";
   };
 
+  use-a = mkDerivation {
+    name = "use-a";
+    inherit (a) first second;
+    builder = builtins.toFile "builder.sh"
+      ''
+        cat $first/file $second/file >$out
+      '';
+  };
+
   b = mkDerivation {
     defaultOutput = assert a.second.helloString == "Hello, world!"; a;
     firstOutput = assert a.outputName == "first"; a.first.first;
@@ -87,4 +96,25 @@ rec {
     buildCommand = "mkdir $a $b $c";
   };
 
+  independent = mkDerivation {
+    name = "multiple-outputs-independent";
+    outputs = [ "first" "second" ];
+    builder = builtins.toFile "builder.sh"
+      ''
+        mkdir $first $second
+        test -z $all
+        echo "first" > $first/file
+        echo "second" > $second/file
+      '';
+  };
+
+  use-independent = mkDerivation {
+    name = "use-independent";
+    inherit (a) first second;
+    builder = builtins.toFile "builder.sh"
+      ''
+        cat $first/file $second/file >$out
+      '';
+  };
+
 }