From 1c208f2b7ef8ffb5e6d435d703dad83223a67bd6 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Fri, 1 Aug 2014 16:46:01 +0200
Subject: [PATCH] Allow regular files as GC roots

If a root is a regular file, then its name must denote a store
path. For instance, the existence of the file

  /nix/var/nix/gcroots/per-user/eelco/hydra-roots/wzc3cy1wwwd6d0dgxpa77ijr1yp50s6v-libxml2-2.7.7

would cause

  /nix/store/wzc3cy1wwwd6d0dgxpa77ijr1yp50s6v-libxml2-2.7.7

to be a root.

This is useful because it involves less I/O (no need for a readlink()
call) and takes up less disk space (the symlink target typically takes
up a full disk block, while directory entries are packed more
efficiently). This is particularly important for hydra.nixos.org,
which has hundreds of thousands of roots, and where reading the roots
can take 25 minutes.
---
 src/libstore/gc.cc | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/libstore/gc.cc b/src/libstore/gc.cc
index 96e891f87..2e2e8507b 100644
--- a/src/libstore/gc.cc
+++ b/src/libstore/gc.cc
@@ -328,6 +328,12 @@ static void findRoots(StoreAPI & store, const Path & path, Roots & roots)
             }
         }
 
+        else if (S_ISREG(st.st_mode)) {
+            Path storePath = settings.nixStore + "/" + baseNameOf(path);
+            if (store.isValidPath(storePath))
+                roots[path] = storePath;
+        }
+
     }
 
     catch (SysError & e) {