nix-channel improvements

"nix-channel --add" now accepts a second argument: the channel name.
This allows channels to have a nicer name than (say) nixpkgs_unstable.
If no name is given, it defaults to the last component of the URL
(with "-unstable" or "-stable" removed).

Also, channels are now stored in a profile
(/nix/var/nix/profiles/per-user/$USER/channels).  One advantage of
this is that it allows rollbacks (e.g. if "nix-channel --update" gives
an undesirable update).

1 files changed, 3 insertions, 3 deletions

diff --git a/corepkgs/unpack-channel.nix b/corepkgs/unpack-channel.nix
index 5e6ccf23fd47..eba957dff4e7 100644
--- a/corepkgs/unpack-channel.nix
+++ b/corepkgs/unpack-channel.nix
@@ -1,11 +1,11 @@
 with import <nix/config.nix>;
 
-{ system, inputs }:
+{ name, src }:
 
 derivation {
-  name = "channels";
+  system = builtins.currentSystem;
   builder = shell;
   args = [ "-e" ./unpack-channel.sh ];
-  inherit system inputs bzip2 tar tr;
+  inherit name src bzip2 tar tr;
   PATH = "${nixBinDir}:${coreutils}";
 }