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package DebPool
::DB;
###
#
# DebPool::DB - Module for managing data hashes via tied NDBM files
#
# Copyright 2003-2004 Joel Aelwyn. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# 3. Neither the name of the Author nor the names of any contributors
# may be used to endorse or promote products derived from this software
# without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# $Id: DB.pm 62 2005-02-23 18:02:38Z joel $
#
###
# We use 'our', so we must have at least Perl 5.6
require 5.006_000
;
# Always good ideas.
use strict
;
use warnings
;
# This module mostly wraps calls to tied NDBM hashes, so we need these.
use Fcntl
;
use NDBM_File
;
### Module setup
BEGIN {
use Exporter
();
our ($VERSION, @ISA, @EXPORT, @EXPORT_OK, %EXPORT_TAGS);
# Version checking
$VERSION = '0.1.5';
@ISA = qw(Exporter
);
@EXPORT = qw(
);
@EXPORT_OK = qw(
%ComponentDB
&Open_Databases
&Close_Databases
&Get_Version
&Set_Versions
);
%EXPORT_TAGS = (
'functions' => [qw(&Open_Databases &Close_Databases &Get_Version
&Set_Versions)],
'vars' => [qw(%ComponentDB)],
);
}
### Exported package globals
# I'd love to be able to do this as a hash of hashes of hashrefs, but the
# database layer can't handle it. So we have multiple DBs.
# VersionDB - hash of tied hashes, keyed on Distribution (then Source
# package). Keeps track of all versions. Prior to 0.2.2, the value pointed
# to was a scalar representing the version of the source package; as of
# 0.2.2 and later, updated records are hashrefs pointing to hashes that
# have package -> version mappings, with 'source' being the key for source
# package version.
our(%VersionDB);
# ComponentDB - hash of tied hashes, keyed on Distribution (then Source
# package). Stores the component data for the given package.
our(%ComponentDB);
### Non-exported package globals
# Thread-safe? What's that? Package global error value. We don't export
# this directly, because it would conflict with other modules.
our($Error);
### File lexicals
# None
### Constant functions
# None
### Meaningful functions
# Open_Databases()
#
# Open all tied NDBM hashes for each real distribution. Returns 0 in the
# case of errors opening hashes, 1 otherwise.
sub Open_Databases
{
use DebPool
::Config qw(:vars
);
my($db_dir) = $Options{'db_dir'};
my($db_file_mode) = $Options{'db_file_mode'};
my($dist);
foreach $dist (@{$Options{'realdists'}}) {
my(%tiedhash);
my($tie_result) = tie(%tiedhash, 'NDBM_File',
"$db_dir/${dist}_version",
O_RDWR
|O_CREAT
, $db_file_mode);
if (!defined($tie_result)) {
return 0;
};
$VersionDB{$dist} = \%tiedhash;
}
foreach $dist (@{$Options{'realdists'}}) {
my(%tiedhash);
my($tie_result) = tie(%tiedhash, 'NDBM_File',
"$db_dir/${dist}_component",
O_RDWR
|O_CREAT
, $db_file_mode);
if (!defined($tie_result)) {
return 0;
};
$ComponentDB{$dist} = \%tiedhash;
}
return 1;
}
# Close_Databases()
#
# Closes all tied NDBM hashes.
#
# NOTE: Untie doesn't return anything (?), so we can't really trap errors.
sub Close_Databases
{
my($dist);
foreach $dist (keys(%VersionDB)) {
untie(%{$VersionDB{$dist}});
}
foreach $dist (keys(%ComponentDB)) {
untie(%{$ComponentDB{$dist}});
}
return 1;
}
# Get_Version($dist, $source, $package)
#
# Retrieves the version of $package (from source package $source) in
# distribution $dist. The package name 'source' retrieves the source
# package name, or undef if no information is available.
sub Get_Version
{
my($dist, $source, $package) = @_;
my($temp) = $VersionDB{$dist}->{$source};
if (!defined($temp)) { return undef; }
# Versions prior to 0.2.2 had only one entry, which is the source
# version; since this is the same as the binary version on the vast
# majority of packages, fake an answer. This works because hash entries
# are guaranteed to be non-empty.
if ($temp !~ m/\|/) {
return $temp;
}
if ('meta' eq $package) {
$temp =~ s/\|.*//;
return $temp;
} elsif ('source' eq $package) {
return $VersionDB{$dist}->{"source_${source}"};
} else {
return $VersionDB{$dist}->{"binary_${source}_${package}"};
}
}
# Set_Versions($dist, $source, $file_arrayref
sub Set_Versions
{
my($dist, $source, $meta_version, $file_arrayref) = @_;
my($oldbinlist) = $VersionDB{$dist}->{$source};
if (defined($oldbinlist) && ($oldbinlist =~ m/\|/)) { # 0.2.2 or later
$oldbinlist =~ s/.*\|//; # Strip meta version
my(@oldbins) = split(/,/,$oldbinlist);
my($oldbin);
foreach $oldbin (@oldbins) {
$VersionDB{$dist}->{"binary_${source}_${oldbin}"} = undef;
}
$VersionDB{$dist}->{"source_${source}"} = undef;
$VersionDB{$dist}->{"${source}"} = undef;
}
# Walk through each file looking for version data. Note that only the
# .dsc file is guaranteed to be the same for source uploads (it can be
# orig.tar.gz or tar.gz, and diff.gz need not exist), and .deb files
# have binary versions, so that's all we look for.
#
# FIXME: Do udeb files have different versions from deb files?
my(@files) = @{$file_arrayref};
my(@entries) = ();
my($hashref);
foreach $hashref (@files) {
my($filename) = $hashref->{'Filename'};
if ($filename =~ m/^([^_]+)_([^_]+)_.+\.deb/) {
my($package) = $1;
my($version) = $2;
$VersionDB{$dist}->{"binary_${source}_${package}"} = $version;
push(@entries, $package);
} elsif ($filename =~ m/^[^_]+_([^_]+)\.dsc/) {
my($version) = $1;
$VersionDB{$dist}->{"source_${source}"} = $version;
push(@entries, 'source');
} # else skip
}
$VersionDB{$dist}->{$source} = "${meta_version}|" . join(',', @entries);
}
END
{}
1;
__END__
# vim:set tabstop=4 expandtab: