From afa7b8a479e48c5642a796563a615314c0261a1a Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Mon, 7 May 2012 17:55:56 -0400
Subject: nix-channel --update: allow updating only the specified channels

---
 scripts/nix-channel.in | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

(limited to 'scripts')

diff --git a/scripts/nix-channel.in b/scripts/nix-channel.in
index 8f0fbbaa5097..6883ffd18db2 100755
--- a/scripts/nix-channel.in
+++ b/scripts/nix-channel.in
@@ -76,6 +76,8 @@ sub removeChannel {
 # Fetch Nix expressions and pull manifests from the subscribed
 # channels.
 sub update {
+    my @channelNames = @_;
+        
     readChannels;
 
     # Create the manifests directory if it doesn't exist.
@@ -87,6 +89,8 @@ sub update {
     # Download each channel.
     my $exprs = "";
     foreach my $name (keys %channels) {
+        next if scalar @channelNames > 0 && ! grep { $_ eq $name } @{channelNames};
+        
         my $url = $channels{$name};
         my $origUrl = "$url/MANIFEST";
 
@@ -141,7 +145,7 @@ Usage:
   nix-channel --add URL [CHANNEL-NAME]
   nix-channel --remove CHANNEL-NAME
   nix-channel --list
-  nix-channel --update
+  nix-channel --update [CHANNEL-NAME...]
 EOF
     exit 1;
 }
@@ -182,8 +186,7 @@ while (scalar @ARGV) {
     }
 
     elsif ($arg eq "--update") {
-        usageError if scalar @ARGV != 0;
-        update;
+        update(@ARGV);
         last;
     }
     
-- 
cgit 1.4.1