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* Speed up the initialisation of /etc in the activation script a lot
by doing it in Perl instead of in Bash. Forking a zillion times is slow. svn path=/nixos/trunk/; revision=23766
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Original file line number | Diff line number | Diff line change |
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use strict; | ||
use File::Find; | ||
use File::Copy; | ||
use File::Path; | ||
use File::Basename; | ||
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my $etc = $ARGV[0] or die; | ||
my $static = "/etc/static"; | ||
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sub atomicSymlink { | ||
my ($source, $target) = @_; | ||
my $tmp = "$target.tmp"; | ||
unlink $tmp; | ||
symlink $source, $tmp or return 1; | ||
rename $tmp, $target or return 1; | ||
return 1; | ||
} | ||
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# Atomically update /etc/static to point at the etc files of the | ||
# current configuration. | ||
atomicSymlink $etc, $static or die; | ||
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# For every file in the etc tree, create a corresponding symlink in | ||
# /etc to /etc/static. The indirection through /etc/static is to make | ||
# switching to a new configuration somewhat more atomic. | ||
sub link { | ||
my $fn = substr $File::Find::name, length($etc) + 1 or next; | ||
my $target = "/etc/$fn"; | ||
File::Path::make_path(dirname $target); | ||
if (-e "$_.mode") { | ||
open MODE, "<$_.mode"; | ||
my $mode = <MODE>; chomp $mode; | ||
close MODE; | ||
copy "$static/$fn", "$target.tmp" or warn; | ||
chmod oct($mode), "$target.tmp" or warn; | ||
rename "$target.tmp", $target or warn; | ||
} elsif (-l "$_") { | ||
atomicSymlink "$static/$fn", $target or warn; | ||
} | ||
} | ||
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find(\&link, $etc); | ||
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# Remove dangling symlinks that point to /etc/static. These are | ||
# configuration files that existed in a previous configuration but not | ||
# in the current one. For efficiency, don't look under /etc/nixos | ||
# (where all the NixOS sources live). | ||
sub cleanup { | ||
if ($File::Find::name eq "/etc/nixos") { | ||
$File::Find::prune = 1; | ||
return; | ||
} | ||
if (-l $_) { | ||
my $target = readlink $_; | ||
if (substr($target, 0, length $static) eq $static) { | ||
my $x = "/etc/static/" . substr($File::Find::name, length "/etc/"); | ||
unlink "$_" unless -e "$x"; | ||
} | ||
} | ||
} | ||
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find(\&cleanup, "/etc"); |