* Channels. These allow you to stay current with an evolving set of

  Nix expressions.

  To subscribe to a channel (needs to be done only once):

    nix-channel --add \
      http://catamaran.labs.cs.uu.nl/dist/nix/channels/nixpkgs-unstable

  This just adds the given URL to ~/.nix-channels (which can also be
  edited manually).

  To update from all channels:

    nix-channel --update

  This fetches the latest expressions and pulls cache manifests.  The
  default Nix expression (~/.nix-defexpr) is made to point to the
  conjunction of the expressions downloaded from all channels.

  So to update all installed derivations in the current user
  environment:

    nix-channel --update
    nix-env --upgrade '*'

  If you are really courageous, you can put this in a cronjob or
  something.

  You can subscribe to multiple channels.  It is not entirely clear
  what happens when there are name clashes between derivations from
  different channels.  From nix-env/main.cc it appears that the one
  with the lowest (highest?) hash will be used, which is pretty
  meaningless.

1 files changed, 3 insertions, 1 deletions

diff --git a/scripts/nix-push.in b/scripts/nix-push.in
index 02f40f04a97d..84330016f310 100644
--- a/scripts/nix-push.in
+++ b/scripts/nix-push.in
@@ -12,7 +12,9 @@ my $manifest = "$tmpdir/MANIFEST";
 
 END { unlink $manifest; unlink $nixfile; rmdir $tmpdir; }
 
-my $curl = "@curl@ --fail --silent ${ENV{'CURL_FLAGS'}}";
+my $curl = "@curl@ --fail --silent";
+my $extraCurlFlags = ${ENV{'CURL_FLAGS'}};
+$curl = "$curl $extraCurlFlags" if defined $extraCurlFlags;
 
 
 # Parse the command line.