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Revision df716c98d203ab64cdf05f9c17fdae565b7daa1c authored by Eelco Dolstra on 23 June 2012, 04:28:35 UTC, committed by Eelco Dolstra on 23 June 2012, 04:28:35 UTC
In chroot builds, use a private network namespace
On Linux it's possible to run a process in its own network namespace,
meaning that it gets its own set of network interfaces, disjunct from
the rest of the system.  We use this to completely remove network
access to chroot builds, except that they get a private loopback
interface.  This means that:

- Builders cannot connect to the outside network or to other processes
  on the same machine, except processes within the same build.

- Vice versa, other processes cannot connect to processes in a chroot
  build, and open ports/connections do not show up in "netstat".

- If two concurrent builders try to listen on the same port (e.g. as
  part of a test), they no longer conflict with each other.

This was inspired by the "PrivateNetwork" flag in systemd.
1 parent 2f3f413
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nix-generate-patches.in 
#! @perl@ -w @perlFlags@

use strict;
use File::Temp qw(tempdir);
use Nix::Manifest;
use Nix::GeneratePatches;

if (scalar @ARGV != 5) {
    print STDERR <<EOF;
Usage: nix-generate-patches NAR-DIR PATCH-DIR PATCH-URI OLD-MANIFEST NEW-MANIFEST

This command generates binary patches between NAR files listed in
OLD-MANIFEST and NEW-MANIFEST.  The patches are written to the
directory PATCH-DIR, and the prefix PATCH-URI is used to generate URIs
for the patches.  The patches are added to NEW-MANIFEST.  All NARs are
required to exist in NAR-DIR.  Patches are generated between
succeeding versions of packages with the same name.
EOF
    exit 1;
}

my $narPath = $ARGV[0];
my $patchesPath = $ARGV[1];
my $patchesURL = $ARGV[2];
my $srcManifest = $ARGV[3];
my $dstManifest = $ARGV[4];

my (%srcNarFiles, %srcLocalPaths, %srcPatches);
readManifest $srcManifest, \%srcNarFiles, \%srcPatches;

my (%dstNarFiles, %dstLocalPaths, %dstPatches);
readManifest $dstManifest, \%dstNarFiles, \%dstPatches;

my $tmpDir = tempdir("nix-generate-patches.XXXXXX", CLEANUP => 1, TMPDIR => 1)
    or die "cannot create a temporary directory";

generatePatches \%srcNarFiles, \%dstNarFiles, \%srcPatches, \%dstPatches,
    $narPath, $patchesPath, $patchesURL, $tmpDir;

propagatePatches \%srcPatches, \%dstNarFiles, \%dstPatches;

# Optionally add all new patches to the manifest in $NIX_ALL_PATCHES.
my $allPatchesFile = $ENV{"NIX_ALL_PATCHES"};
if (defined $allPatchesFile) {
    my (%dummy, %allPatches);
    readManifest("$patchesPath/all-patches", \%dummy, \%allPatches)
        if -f $allPatchesFile;
    copyPatches \%dstPatches, \%allPatches;
    writeManifest($allPatchesFile, {}, \%allPatches, 0);
}

writeManifest $dstManifest, \%dstNarFiles, \%dstPatches;