From 8906eda2f90f6b8b7bb7b6a3dccaac8a109ff767 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Tue, 12 Jan 2016 17:27:40 +0100
Subject: [PATCH] Canonicalize gids to 0

Previously files in the Nix store were owned by root or by nixbld,
depending on whether they were created by a substituter or by a
builder. This doesn't matter much, but causes spurious diffoscope
differences. So use root everywhere.
---
 src/libstore/local-store.cc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/libstore/local-store.cc b/src/libstore/local-store.cc
index d7cd0b088..9199b1206 100644
--- a/src/libstore/local-store.cc
+++ b/src/libstore/local-store.cc
@@ -602,10 +602,10 @@ static void canonicalisePathMetaData_(const Path & path, uid_t fromUid, InodesSe
        users group); we check for this case below. */
     if (st.st_uid != geteuid()) {
 #if HAVE_LCHOWN
-        if (lchown(path.c_str(), geteuid(), (gid_t) -1) == -1)
+        if (lchown(path.c_str(), geteuid(), getegid()) == -1)
 #else
         if (!S_ISLNK(st.st_mode) &&
-            chown(path.c_str(), geteuid(), (gid_t) -1) == -1)
+            chown(path.c_str(), geteuid(), getegid()) == -1)
 #endif
             throw SysError(format("changing owner of ‘%1%’ to %2%")
                 % path % geteuid());