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* nix-prefetch-url: support caching. If the environment variable

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NIX_DOWNLOAD_CACHE is set, then nix-prefetch-url will store the hash
  and timestamp of downloaded files in the directory
  $NIX_DOWNLOAD_CACHE.  This allows it to figure out if the file is
  still in the Nix store.
This commit is contained in:
Eelco Dolstra 2007-08-09 23:16:44 +00:00
parent ef240bc0d5
commit f881f7a017
3 changed files with 58 additions and 13 deletions
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3
scripts/nix-channel.in
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@ -98,7 +98,8 @@ sub update {
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`;
$ENV{"QUIET"} = 1;
my ($hash, $path) = `@bindir@/nix-prefetch-url '$fullURL'`;
die "cannot fetch `$fullURL'" if $? != 0;
chomp $path;
$inputs .= '"' . $channelName . '"' . " " . $path . " ";