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// -*- mode: cpp; mode: fold -*-
// Description /*{{{*/
// $Id: cachedb.cc,v 1.2 2001/02/20 07:03:18 jgg Exp $
/* ######################################################################
CacheDB
Simple uniform interface to a cache database.
##################################################################### */
/*}}}*/
// Include Files /*{{{*/
#ifdef __GNUG__
#pragma implementation "cachedb.h"
#endif
#include "cachedb.h"
#include <apt-pkg/error.h>
#include <apt-pkg/md5.h>
#include <apt-pkg/strutl.h>
#include <apt-pkg/configuration.h>
#include <netinet/in.h> // htonl, etc
/*}}}*/
// CacheDB::ReadyDB - Ready the DB2 /*{{{*/
// ---------------------------------------------------------------------
/* This opens the DB2 file for caching package information */
bool CacheDB::ReadyDB(string DB)
{
ReadOnly = _config->FindB("APT::FTPArchive::ReadOnlyDB",false);
// Close the old DB
if (Dbp != 0)
Dbp->close(Dbp,0);
/* Check if the DB was disabled while running and deal with a
corrupted DB */
if (DBFailed() == true)
{
_error->Warning("DB was corrupted, file renamed to %s.old",DBFile.c_str());
rename(DBFile.c_str(),(DBFile+".old").c_str());
}
DBLoaded = false;
Dbp = 0;
DBFile = string();
if (DB.empty())
return true;
if ((errno = db_open(DB.c_str(),DB_HASH,
(ReadOnly?DB_RDONLY:DB_CREATE),
0644,0,0,&Dbp)) != 0)
{
Dbp = 0;
return _error->Errno("db_open","Unable to open DB2 file %s",DB.c_str());
}
DBFile = DB;
DBLoaded = true;
return true;
}
/*}}}*/
// CacheDB::SetFile - Select a file to be working with /*{{{*/
// ---------------------------------------------------------------------
/* All future actions will be performed against this file */
bool CacheDB::SetFile(string FileName,struct stat St,FileFd *Fd)
{
delete DebFile;
DebFile = 0;
this->FileName = FileName;
this->Fd = Fd;
this->FileStat = St;
FileStat = St;
memset(&CurStat,0,sizeof(CurStat));
Stats.Bytes += St.st_size;
Stats.Packages++;
if (DBLoaded == false)
return true;
InitQuery("st");
// Ensure alignment of the returned structure
Data.data = &CurStat;
Data.ulen = sizeof(CurStat);
Data.flags = DB_DBT_USERMEM;
// Lookup the stat info and confirm the file is unchanged
if (Get() == true)
{
if (CurStat.st_mtime != htonl(St.st_mtime))
{
CurStat.st_mtime = htonl(St.st_mtime);
CurStat.Flags = 0;
_error->Warning("File date has changed %s",FileName.c_str());
}
}
else
{
CurStat.st_mtime = htonl(St.st_mtime);
CurStat.Flags = 0;
}
CurStat.Flags = ntohl(CurStat.Flags);
OldStat = CurStat;
return true;
}
/*}}}*/
// CacheDB::LoadControl - Load Control information /*{{{*/
// ---------------------------------------------------------------------
/* */
bool CacheDB::LoadControl()
{
// Try to read the control information out of the DB.
if ((CurStat.Flags & FlControl) == FlControl)
{
// Lookup the control information
InitQuery("cl");
if (Get() == true && Control.TakeControl(Data.data,Data.size) == true)
return true;
CurStat.Flags &= ~FlControl;
}
// Create a deb instance to read the archive
if (DebFile == 0)
{
DebFile = new debDebFile(*Fd);
if (_error->PendingError() == true)
return false;
}
Stats.Misses++;
if (Control.Read(*DebFile) == false)
return false;
if (Control.Control == 0)
return _error->Error("Archive has no control record");
// Write back the control information
InitQuery("cl");
if (Put(Control.Control,Control.Length) == true)
CurStat.Flags |= FlControl;
return true;
}
/*}}}*/
// CacheDB::LoadContents - Load the File Listing /*{{{*/
// ---------------------------------------------------------------------
/* */
bool CacheDB::LoadContents(bool GenOnly)
{
// Try to read the control information out of the DB.
if ((CurStat.Flags & FlContents) == FlContents)
{
if (GenOnly == true)
return true;
// Lookup the contents information
InitQuery("cn");
if (Get() == true)
{
if (Contents.TakeContents(Data.data,Data.size) == true)
return true;
}
CurStat.Flags &= ~FlContents;
}
// Create a deb instance to read the archive
if (DebFile == 0)
{
DebFile = new debDebFile(*Fd);
if (_error->PendingError() == true)
return false;
}
if (Contents.Read(*DebFile) == false)
return false;
// Write back the control information
InitQuery("cn");
if (Put(Contents.Data,Contents.CurSize) == true)
CurStat.Flags |= FlContents;
return true;
}
/*}}}*/
// CacheDB::GetMD5 - Get the MD5 hash /*{{{*/
// ---------------------------------------------------------------------
/* */
bool CacheDB::GetMD5(string &MD5Res,bool GenOnly)
{
// Try to read the control information out of the DB.
if ((CurStat.Flags & FlMD5) == FlMD5)
{
if (GenOnly == true)
return true;
InitQuery("m5");
if (Get() == true)
{
MD5Res = string((char *)Data.data,Data.size);
return true;
}
CurStat.Flags &= ~FlMD5;
}
Stats.MD5Bytes += FileStat.st_size;
MD5Summation MD5;
if (Fd->Seek(0) == false || MD5.AddFD(Fd->Fd(),FileStat.st_size) == false)
return false;
MD5Res = MD5.Result();
InitQuery("m5");
if (Put(MD5Res.begin(),MD5Res.length()) == true)
CurStat.Flags |= FlMD5;
return true;
}
/*}}}*/
// CacheDB::Finish - Write back the cache structure /*{{{*/
// ---------------------------------------------------------------------
/* */
bool CacheDB::Finish()
{
// Optimize away some writes.
if (CurStat.Flags == OldStat.Flags &&
CurStat.st_mtime == OldStat.st_mtime)
return true;
// Write the stat information
CurStat.Flags = htonl(CurStat.Flags);
InitQuery("st");
Put(&CurStat,sizeof(CurStat));
CurStat.Flags = ntohl(CurStat.Flags);
return true;
}
/*}}}*/
// CacheDB::Clean - Clean the Database /*{{{*/
// ---------------------------------------------------------------------
/* Tidy the database by removing files that no longer exist at all. */
bool CacheDB::Clean()
{
if (DBLoaded == false)
return true;
/* I'm not sure what VERSION_MINOR should be here.. 2.4.14 certainly
needs the lower one and 2.7.7 needs the upper.. */
#if DB_VERSION_MAJOR >= 2 && DB_VERSION_MINOR >= 7
DBC *Cursor;
if ((errno = Dbp->cursor(Dbp,0,&Cursor,0)) != 0)
return _error->Error("Unable to get a cursor");
#else
DBC *Cursor;
if ((errno = Dbp->cursor(Dbp,0,&Cursor)) != 0)
return _error->Error("Unable to get a cursor");
#endif
DBT Key;
DBT Data;
memset(&Key,0,sizeof(Key));
memset(&Data,0,sizeof(Data));
while ((errno = Cursor->c_get(Cursor,&Key,&Data,DB_NEXT)) == 0)
{
const char *Colon = (char *)Key.data;
for (; Colon != (char *)Key.data+Key.size && *Colon != ':'; Colon++);
if ((char *)Key.data+Key.size - Colon > 2)
{
if (stringcmp((char *)Key.data,Colon,"st") == 0 ||
stringcmp((char *)Key.data,Colon,"cn") == 0 ||
stringcmp((char *)Key.data,Colon,"m5") == 0 ||
stringcmp((char *)Key.data,Colon,"cl") == 0)
{
if (FileExists(string(Colon+1,(const char *)Key.data+Key.size)) == true)
continue;
}
}
Cursor->c_del(Cursor,0);
}
return true;
}
/*}}}*/
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