24/27: Chroot builds: Provide world-readable /nix/store

[Ludovic Courtès]

civodul pushed a commit to branch nix
in repository guix.

commit 44f1b1851ccf836411ca09f5ebc50fc08d92e7e8
Author: Eelco Dolstra <address@hidden>
Date:   Thu Apr 2 16:59:40 2015 +0200

    Chroot builds: Provide world-readable /nix/store
    
    This was causing NixOS VM tests to fail mysteriously since
    5ce50cd99e740d0d0f18c30327ae687be9356553. Nscd could (sometimes) no
    longer read /etc/hosts:
    
    open("/etc/hosts", O_RDONLY|O_CLOEXEC) = -1 EACCES (Permission denied)
    
    Probably there was some wacky interaction between the guest kernel and
    the 9pfs implementation in QEMU.
---
 nix/libstore/build.cc |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/nix/libstore/build.cc b/nix/libstore/build.cc
index 9a69a79..f3a4a45 100644
--- a/nix/libstore/build.cc
+++ b/nix/libstore/build.cc
@@ -1826,7 +1826,7 @@ void DerivationGoal::startBuilder()
            build user. */
         Path chrootStoreDir = chrootRootDir + settings.nixStore;
         createDirs(chrootStoreDir);
-        chmod_(chrootStoreDir, 0730);
+        chmod_(chrootStoreDir, 0735);
 
         if (chown(chrootStoreDir.c_str(), 0, buildUser.getGID()) == -1)
             throw SysError(format("cannot change ownership of ‘%1%’") % 
chrootStoreDir);