From 93aefd9fc0250eda2c47d22a88922d319cde34b8 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <e.dolstra@tudelft.nl>
Date: Tue, 1 May 2007 23:16:38 +0000
Subject: * Give unpacked channels more sensible names than 0, 1, ...  They now
   get the basename of the channel URL (e.g., nixpkgs-unstable).  The  
 top-level Nix expression of the channel is now an attribute set, the  
 attributes of which are the individual channels (e.g.,   {nixpkgs_unstable =
 ...; strategoxt_unstable = ...}).  This makes   attribute paths ("nix-env
 -qaA" and "nix-env -iA") more sensible,   e.g., "nix-env -iA
 nixpkgs_unstable.subversion".

---
 scripts/nix-channel.in | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

(limited to 'scripts')

diff --git a/scripts/nix-channel.in b/scripts/nix-channel.in
index 73096a12baba..095f36d79499 100644
--- a/scripts/nix-channel.in
+++ b/scripts/nix-channel.in
@@ -89,21 +89,22 @@ sub update {
     # Create a Nix expression that fetches and unpacks the channel Nix
     # expressions.
 
-    my $nixExpr = "[";
+    my $inputs = "[";
     foreach my $url (@channels) {
+        $url =~ /\/([^\/]+)\/?$/;
+        my $channelName = $1;
+        $channelName = "unnamed" unless defined $channelName;
+        print "$channelName\n";
+
         my $fullURL = "$url/nixexprs.tar.bz2";
         print "downloading Nix expressions from `$fullURL'...\n";
         $ENV{"PRINT_PATH"} = 1;
         my ($hash, $path) = `@bindir@/nix-prefetch-url '$fullURL' 2> /dev/null`;
         die "cannot fetch `$fullURL'" if $? != 0;
         chomp $path;
-        $nixExpr .= $path . " ";
+        $inputs .= '"' . $channelName . '"' . " " . $path . " ";
     }
-    $nixExpr .= "]";
-
-    $nixExpr =
-        "(import @datadir@/nix/corepkgs/channels/unpack.nix) " .
-        "{inputs = $nixExpr; system = \"@system@\";}";
+    $inputs .= "]";
 
     # Figure out a name for the GC root.
     my $userName = getpwuid($<);
@@ -113,7 +114,7 @@ sub update {
     
     # Instantiate the Nix expression.
     print "unpacking channel Nix expressions...\n";
-    my $storeExpr = `echo '$nixExpr' | @bindir@/nix-instantiate --add-root '$rootFile'.tmp -`
+    my $storeExpr = `@bindir@/nix-instantiate --add-root '$rootFile'.tmp @datadir@/nix/corepkgs/channels/unpack.nix --argstr system @system@ --arg inputs '$inputs'`
         or die "cannot instantiate Nix expression";
     chomp $storeExpr;
 
-- 
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