From e3c2b0023774eed05657ca1dbb469a85bd294d23 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Wed, 15 Jul 2020 19:50:32 +0200
Subject: [PATCH] Make InstallableStorePath behave consistently with
 InstallableValue

That is, the commands 'nix path-info nixpkgs#hello' and 'nix path-info
/nix/store/00ls0qi49qkqpqblmvz5s1ajl3gc63lr-hello-2.10.drv' now do the
same thing (i.e. build the derivation and operate on the output store
path, rather than the .drv path).
---
 src/nix/installables.cc | 27 ++++++++++++++++++---------
 1 file changed, 18 insertions(+), 9 deletions(-)

diff --git a/src/nix/installables.cc b/src/nix/installables.cc
index c97a0bdcf..415358970 100644
--- a/src/nix/installables.cc
+++ b/src/nix/installables.cc
@@ -296,15 +296,24 @@ struct InstallableStorePath : Installable
 
     Buildables toBuildables() override
     {
-        std::map<std::string, StorePath> outputs;
-        outputs.insert_or_assign("out", storePath);
-        Buildable b{
-            .drvPath = storePath.isDerivation() ? storePath : std::optional<StorePath>(),
-            .outputs = std::move(outputs)
-        };
-        Buildables bs;
-        bs.push_back(std::move(b));
-        return bs;
+        if (storePath.isDerivation()) {
+            std::map<std::string, StorePath> outputs;
+            for (auto & [name, output] : store->readDerivation(storePath).outputs)
+                outputs.emplace(name, output.path);
+            return {
+                Buildable {
+                    .drvPath = storePath,
+                    .outputs = std::move(outputs)
+                }
+            };
+        } else {
+            return {
+                Buildable {
+                    .drvPath = {},
+                    .outputs = {{"out", storePath}}
+                }
+            };
+        }
     }
 
     std::optional<StorePath> getStorePath() override