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* Give unpacked channels more sensible names than 0, 1, ... They now

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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".
This commit is contained in:
Eelco Dolstra 2007-05-01 23:16:38 +00:00
parent a9d15d4f43
commit 93aefd9fc0
5 changed files with 43 additions and 20 deletions
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17
scripts/nix-channel.in
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@ -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;