/usr/share/perl5/Debconf/DbDriver/File.pm is in debconf 1.5.66.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 | #!/usr/bin/perl -w
# This file was preprocessed, do not edit!
package Debconf::DbDriver::File;
use strict;
use Debconf::Log qw(:all);
use Cwd 'abs_path';
use POSIX ();
use Fcntl qw(:DEFAULT :flock);
use IO::Handle;
use base 'Debconf::DbDriver::Cache';
use fields qw(filename mode format _fh);
sub init {
my $this=shift;
if (exists $this->{mode}) {
$this->{mode} = oct($this->{mode});
}
else {
$this->{mode} = 0600;
}
$this->{format} = "822" unless exists $this->{format};
$this->{backup} = 1 unless exists $this->{backup};
$this->error("No format specified") unless $this->{format};
eval "use Debconf::Format::$this->{format}";
if ($@) {
$this->error("Error setting up format object $this->{format}: $@");
}
$this->{format}="Debconf::Format::$this->{format}"->new;
if (not ref $this->{format}) {
$this->error("Unable to make format object");
}
$this->error("No filename specified") unless $this->{filename};
my ($directory)=$this->{filename}=~m!^(.*)/[^/]+!;
if (length $directory and ! -d $directory) {
mkdir $directory || $this->error("mkdir $directory:$!");
}
$this->{filename} = abs_path($this->{filename});
debug "db $this->{name}" => "started; filename is $this->{filename}";
if (! -e $this->{filename}) {
$this->{backup}=0;
sysopen(my $fh, $this->{filename},
O_WRONLY|O_TRUNC|O_CREAT,$this->{mode}) or
$this->error("could not open $this->{filename}");
close $fh;
}
my $implicit_readonly=0;
if (! $this->{readonly}) {
if (open ($this->{_fh}, "+<", $this->{filename})) {
while (! flock($this->{_fh}, LOCK_EX | LOCK_NB)) {
next if $! == &POSIX::EINTR;
$this->error("$this->{filename} is locked by another process: $!");
last;
}
}
else {
$implicit_readonly=1;
}
}
if ($this->{readonly} || $implicit_readonly) {
if (! open ($this->{_fh}, "<", $this->{filename})) {
$this->error("could not open $this->{filename}: $!");
return; # always abort, even if not throwing fatal error
}
}
$this->SUPER::init(@_);
debug "db $this->{name}" => "loading database";
while (! eof $this->{_fh}) {
my ($item, $cache)=$this->{format}->read($this->{_fh});
$this->{cache}->{$item}=$cache;
}
if ($this->{readonly} || $implicit_readonly) {
close $this->{_fh};
}
}
sub shutdown {
my $this=shift;
return if $this->{readonly};
if (grep $this->{dirty}->{$_}, keys %{$this->{cache}}) {
debug "db $this->{name}" => "saving database";
}
else {
debug "db $this->{name}" => "no database changes, not saving";
delete $this->{_fh};
return 1;
}
sysopen(my $fh, $this->{filename}."-new",
O_WRONLY|O_TRUNC|O_CREAT,$this->{mode}) or
$this->error("could not write $this->{filename}-new: $!");
while (! flock($fh, LOCK_EX | LOCK_NB)) {
next if $! == &POSIX::EINTR;
$this->error("$this->{filename}-new is locked by another process: $!");
last;
}
$this->{format}->beginfile;
foreach my $item (sort keys %{$this->{cache}}) {
next unless defined $this->{cache}->{$item}; # skip deleted
$this->{format}->write($fh, $this->{cache}->{$item}, $item)
or $this->error("could not write $this->{filename}-new: $!");
}
$this->{format}->endfile;
$fh->flush or $this->error("could not flush $this->{filename}-new: $!");
$fh->sync or $this->error("could not sync $this->{filename}-new: $!");
if (-e $this->{filename} && $this->{backup}) {
rename($this->{filename}, $this->{filename}."-old") or
debug "db $this->{name}" => "rename failed: $!";
}
rename($this->{filename}."-new", $this->{filename}) or
$this->error("rename failed: $!");
delete $this->{_fh};
return 1;
}
sub load {
return undef;
}
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