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/* pkg_acqfile.cpp
 *
 * Copyright (c) 2002, 2005 Daniel Burrows
 * Copyright (c) 2009 Daniel Nicoletti <dantti85-pk@yahoo.com.br>
 *               2012 Matthias Klumpp <matthias@tenstral.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

// (based on pkg_changelog)

#include "pkg_acqfile.h"

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>

#include <apt-pkg/error.h>
#include <apt-pkg/configuration.h>
#include <apt-pkg/acquire-item.h>
#include <apt-pkg/sourcelist.h>
#include <apt-pkg/strutl.h>

// Let's all sing a song about apt-pkg's brokenness..

pkgAcqFileSane::pkgAcqFileSane(pkgAcquire *Owner, string URI,
                               string Description, string ShortDesc,
                               string filename) :
    Item(Owner)
{
    Retries=_config->FindI("Acquire::Retries",0);
    DestFile=filename;

    Desc.URI=URI;
    Desc.Description=Description;
    Desc.Owner=this;
    Desc.ShortDesc=ShortDesc;

    QueueURI(Desc);
}

// Straight from acquire-item.cc
/* Here we try other sources */
void pkgAcqFileSane::Failed(string Message,pkgAcquire::MethodConfig *Cnf)
{
    ErrorText = LookupTag(Message,"Message");

    // This is the retry counter
    if (Retries != 0 &&
            Cnf->LocalOnly == false &&
            StringToBool(LookupTag(Message,"Transient-Failure"),false) == true) {
        Retries--;
        QueueURI(Desc);
        return;
    }

    Item::Failed(Message,Cnf);
}

// Mostly copied from pkgAcqArchive.
bool get_archive(pkgAcquire *Owner, pkgSourceList *Sources,
                 pkgRecords *Recs, pkgCache::VerIterator const &Version,
                 string directory, string &StoreFilename)
{
    pkgCache::VerFileIterator Vf=Version.FileList();

    if (Version.Arch() == 0) {
        return _error->Error("I wasn't able to locate a file for the %s package. "
                             "This might mean you need to manually fix this package. (due to missing arch)",
                             Version.ParentPkg().Name());
    }

    /* We need to find a filename to determine the extension. We make the
        assumption here that all the available sources for this version share
        the same extension.. */
    // Skip not source sources, they do not have file fields.
    for (; Vf.end() == false; Vf++) {
        if ((Vf.File()->Flags & pkgCache::Flag::NotSource) != 0) {
            continue;
        }
        break;
    }

    // Does not really matter here.. we are going to fail out below
    if (Vf.end() != true) {
        // If this fails to get a file name we will bomb out below.
        pkgRecords::Parser &Parse = Recs->Lookup(Vf);
        if (_error->PendingError() == true) {
            return false;
        }

        // Generate the final file name as: package_version_arch.foo
        StoreFilename = QuoteString(Version.ParentPkg().Name(),"_:") + '_' +
                QuoteString(Version.VerStr(),"_:") + '_' +
                QuoteString(Version.Arch(),"_:.") +
                "." + flExtension(Parse.FileName());
    }

    for (; Vf.end() == false; Vf++) {
        // Ignore not source sources
        if ((Vf.File()->Flags & pkgCache::Flag::NotSource) != 0) {
            continue;
        }

        // Try to cross match against the source list
        pkgIndexFile *Index;
        if (Sources->FindIndex(Vf.File(),Index) == false) {
            continue;
        }

        // Grab the text package record
        pkgRecords::Parser &Parse = Recs->Lookup(Vf);
        if (_error->PendingError() == true) {
            return false;
        }

        const string PkgFile = Parse.FileName();
        const string MD5     = Parse.MD5Hash();
        if (PkgFile.empty() == true) {
            return _error->Error("The package index files are corrupted. No Filename: "
                                 "field for package %s.",
                                 Version.ParentPkg().Name());
        }

        string DestFile = directory + "/" + flNotDir(StoreFilename);

        // Create the item
        new pkgAcqFile(Owner,
                       Index->ArchiveURI(PkgFile),
                       MD5,
                       Version->Size,
                       Index->ArchiveInfo(Version),
                       Version.ParentPkg().Name(),
                       "",
                       DestFile);

        Vf++;
        return true;
    }
    return false;
}