wroclaw-git-backups/nix
1
0
Fork 0
mirror of https://github.com/NixOS/nix synced 2025-06-26 20:01:15 +02:00
Code Activity

* We no longer use nix-populate standalone, rather we use it as a

Browse source 
build action for `system' packages (like system.fix) that have
  dependencies on all packages we want to activate.

  So the command sequence to switch to a new activation configuration
  of the system would be:

    $ fix -i .../fixdescriptors/system.fix
    ...
    system.fix -> 89cf4713b37cc66989304abeb9ea189f

    $ nix-switch 89cf4713b37cc66989304abeb9ea189f

* A nix-profile.sh script that can be included in .bashrc.
This commit is contained in:
Eelco Dolstra 2003-04-09 12:26:48 +00:00
parent f56b7312b2
commit aa8fda4b54
8 changed files with 85 additions and 42 deletions
Download patch file Download diff file Expand all files Collapse all files

49
scripts/nix-populate
View file

@ -1,23 +1,16 @@
#! /usr/bin/perl -w
use strict;
use Cwd;
my $selfdir = cwd;
my $pkglist = $ENV{"NIX_ACTIVATIONS"};
$pkglist or die "NIX_ACTIVATIONS not set";
my $linkdir = $ENV{"NIX_LINKS"};
$linkdir or die "NIX_LINKS not set";
my @dirs = ("bin", "sbin", "lib", "include");
# Figure out a generation number.
my $nr = 1;
while (-e "$linkdir/$nr") { $nr++; }
my $gendir = "$linkdir/$nr";
print "populating $gendir\n";
# Create the subdirectories.
mkdir $gendir;
mkdir $selfdir;
foreach my $dir (@dirs) {
mkdir "$gendir/$dir";
mkdir "$selfdir/$dir";
}
# For each activated package, create symlinks.
@ -51,39 +44,15 @@ sub createLinks {
}
}
foreach my $name (keys %ENV) {
open PKGS, "< $pkglist";
next unless ($name =~ /^act.*$/);
while (<PKGS>) {
chomp;
my $hash = $_;
my $pkgdir = `nix getpkg $hash`;
if ($?) { die "`nix getpkg' failed"; }
chomp $pkgdir;
my $pkgdir = $ENV{$name};
print "merging $pkgdir\n";
foreach my $dir (@dirs) {
createLinks("$pkgdir/$dir", "$gendir/$dir");
createLinks("$pkgdir/$dir", "$selfdir/$dir");
}
}
close PKGS;
# Make $gendir the current generation by pointing $linkdir/current to
# it. The rename() system call is supposed to be essentially atomic
# on Unix. That is, if we have links `current -> X' and `new_current
# -> Y', and we rename new_current to current, a process accessing
# current will see X or Y, but never a file-not-found or other error
# condition. This is sufficient to atomically switch the current link
# tree.
my $current = "$linkdir/current";
print "switching $current to $gendir\n";
my $tmplink = "$linkdir/new_current";
symlink($gendir, $tmplink) or die "cannot create $tmplink";
rename($tmplink, $current) or die "cannot rename $tmplink";