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From: Ludovic Courtès
Subject: [PATCH]
Date: Mon, 14 Apr 2014 15:38:01 +0200
User-agent: Gnus/5.130007 (Ma Gnus v0.7) Emacs/24.3 (gnu/linux)

The patch below allows files such as /nix/store/foo to be protected from
GC if a root refers to them.  This makes it easy for a build hook to use
such files for its temporary working files.



diff --git a/src/libstore/ b/src/libstore/
index 96e891f..299bf5f 100644
--- a/src/libstore/
+++ b/src/libstore/
@@ -287,10 +287,7 @@ static void foundRoot(StoreAPI & store,
     const Path & path, const Path & target, Roots & roots)
     Path storePath = toStorePath(target);
-    if (store.isValidPath(storePath))
     roots[path] = storePath;
-    else
-        printMsg(lvlInfo, format("skipping invalid root from `%1%' to `%2%'") 
% path % storePath);

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