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* nix-channel: supports users who don't have write permission to the

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manifests directory.  In that case, we don't do a nix-pull, so the
  user gets pure source deployment.

  The directory /nix/var/nix/gcroots/per-user/$USER should be
  writable.  (It's created automatically if
  /nix/var/nix/gcroots/per-user is writable, e.g. if it has 1777
  permission.)
This commit is contained in:
Eelco Dolstra 2007-08-22 14:52:22 +00:00
parent 2629998e91
commit 7d5836b34d
1 changed files with 21 additions and 12 deletions
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33
scripts/nix-channel.in
View file

@ -2,7 +2,7 @@
use strict;
my $rootsDir = "@localstatedir@/nix/gcroots/channels";
my $rootsDir = "@localstatedir@/nix/gcroots";
my $stateDir = $ENV{"NIX_STATE_DIR"};
$stateDir = "@localstatedir@/nix" unless defined $stateDir;
@ -10,8 +10,8 @@ $stateDir = "@localstatedir@/nix" unless defined $stateDir;
# Turn on caching in nix-prefetch-url.
my $channelCache = "$stateDir/channel-cache";
$ENV{'NIX_DOWNLOAD_CACHE'} = $channelCache;
mkdir $channelCache, 0755 unless -e $channelCache;
$ENV{'NIX_DOWNLOAD_CACHE'} = $channelCache if -W $channelCache;
# Figure out the name of the `.nix-channels' file to use.
@ -76,16 +76,25 @@ sub removeChannel {
sub update {
readChannels;
# Remove all the old manifests.
for my $manifest (glob "$stateDir/manifests/*.nixmanifest") {
unlink $manifest or die "cannot remove `$manifest': $!";
}
# Do we have write permission to the manifests directory? If not,
# then just skip pulling the manifest and just download the Nix
# expressions. If the user is a non-privileged user in a
# multi-user Nix installation, he at least gets installation from
# source.
if (-W "$stateDir/manifests") {
# Remove all the old manifests.
for my $manifest (glob "$stateDir/manifests/*.nixmanifest") {
unlink $manifest or die "cannot remove `$manifest': $!";
}
# Pull cache manifests.
foreach my $url (@channels) {
#print "pulling cache manifest from `$url'\n";
system("@bindir@/nix-pull", "--skip-wrong-store", "$url/MANIFEST") == 0
or die "cannot pull cache manifest from `$url'";
}
# Pull cache manifests.
foreach my $url (@channels) {
#print "pulling cache manifest from `$url'\n";
system("@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
@ -112,7 +121,7 @@ sub update {
my $userName = getpwuid($<);
die "who ARE you? go away" unless defined $userName;
my $rootFile = "$rootsDir/$userName";
my $rootFile = "$rootsDir/per-user/$userName/channels";
# Instantiate the Nix expression.
print "unpacking channel Nix expressions...\n";