Support netrc in <nix/fetchurl.nix>

This allows <nix/fetchurl.nix> to fetch private Git/Mercurial
repositories, e.g.

  import <nix/fetchurl.nix> {
    url = https://edolstra@bitbucket.org/edolstra/my-private-repo/get/80a14018daed.tar.bz2;
    sha256 = "1mgqzn7biqkq3hf2697b0jc4wabkqhmzq2srdymjfa6sb9zb6qs7";
  }

where /etc/nix/netrc contains:

  machine bitbucket.org
  login edolstra
  password blabla...

This works even when sandboxing is enabled.

To do: add unpacking support (i.e. fetchzip functionality).

1 files changed, 2 insertions, 2 deletions

diff --git a/src/libutil/util.cc b/src/libutil/util.cc
index 3365993680..0a5f796e4e 100644
--- a/src/libutil/util.cc
+++ b/src/libutil/util.cc
@@ -288,9 +288,9 @@ string readFile(const Path & path, bool drain)
 }
 
 
-void writeFile(const Path & path, const string & s)
+void writeFile(const Path & path, const string & s, mode_t mode)
 {
-    AutoCloseFD fd = open(path.c_str(), O_WRONLY | O_TRUNC | O_CREAT | O_CLOEXEC, 0666);
+    AutoCloseFD fd = open(path.c_str(), O_WRONLY | O_TRUNC | O_CREAT | O_CLOEXEC, mode);
     if (!fd)
         throw SysError(format("opening file ‘%1%’") % path);
     writeFull(fd.get(), s);