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* nix-channel: fail if we don't have write permission to the manifests

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directory.  Previously in this situation we did add the Nix
  expressions from the channel to allow installation from source, but
  this doesn't work for binary-only channels and leads to confusing
  error messages.
This commit is contained in:
Eelco Dolstra 2012-02-02 12:25:56 +00:00
parent baa0501cc1
commit ce86a9a0ae
1 changed files with 7 additions and 13 deletions
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20
scripts/nix-channel.in
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@ -79,20 +79,14 @@ sub update {
# Create the manifests directory if it doesn't exist.
mkdir $manifestDir, 0755 unless -e $manifestDir;
# Do we have write permission to the manifests directory? If not,
# then just skip pulling the manifest and just download the Nix
# expressions. If the user is a non-privileged user in a
# multi-user Nix installation, he at least gets installation from
# source.
if (-W $manifestDir) {
# Pull cache manifests.
foreach my $url (@channels) {
#print "pulling cache manifest from `$url'\n";
system("$Nix::Config::binDir/nix-pull", "--skip-wrong-store", "$url/MANIFEST") == 0
or die "cannot pull cache manifest from `$url'";
}
# Do we have write permission to the manifests directory?
die "$0: you do not have write permission to `$manifestDir'!\n" unless -W $manifestDir;
# Pull cache manifests.
foreach my $url (@channels) {
#print "pulling cache manifest from `$url'\n";
system("$Nix::Config::binDir/nix-pull", "--skip-wrong-store", "$url/MANIFEST") == 0
or die "cannot pull cache manifest from `$url'";
}
# Create a Nix expression that fetches and unpacks the channel Nix