File: clean.cc

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// -*- mode: cpp; mode: fold -*-
// Description								/*{{{*/
/* ######################################################################

   Clean - Clean out downloaded directories
   
   ##################################################################### */
									/*}}}*/
// Includes								/*{{{*/
#include <config.h>

#include <apt-pkg/aptconfiguration.h>
#include <apt-pkg/clean.h>
#include <apt-pkg/configuration.h>
#include <apt-pkg/error.h>
#include <apt-pkg/fileutl.h>
#include <apt-pkg/pkgcache.h>
#include <apt-pkg/strutl.h>

#include <string>
#include <dirent.h>
#include <fcntl.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>

#include <apti18n.h>
									/*}}}*/
// ArchiveCleaner::Go - Perform smart cleanup of the archive		/*{{{*/
// ---------------------------------------------------------------------
/* Scan the directory for files to erase, we check the version information
   against our database to see if it is interesting */
bool pkgArchiveCleaner::Go(std::string Dir,pkgCache &Cache)
{
   bool CleanInstalled = _config->FindB("APT::Clean-Installed",true);

   if(Dir == "/")
      return _error->Error(_("Clean of %s is not supported"), Dir.c_str());

   // non-existing directories are always clean
   // we do not check for a directory explicitly to support symlinks
   if (FileExists(Dir) == false)
      return true;

   auto const withoutChangingDir = dynamic_cast<pkgArchiveCleaner2*>(this);
   int const dirfd = open(Dir.c_str(), O_RDONLY | O_DIRECTORY | O_CLOEXEC);
   if (dirfd == -1)
      return _error->Errno("open",_("Unable to read %s"),Dir.c_str());
   std::string CWD;
   if (withoutChangingDir == nullptr)
   {
      CWD = SafeGetCWD();
      if (fchdir(dirfd) != 0)
	 return _error->Errno("fchdir",_("Unable to change to %s"),Dir.c_str());
   }
   DIR * const D = fdopendir(dirfd);
   if (D == nullptr)
      return _error->Errno("opendir",_("Unable to read %s"),Dir.c_str());

   for (struct dirent *Dir = readdir(D); Dir != 0; Dir = readdir(D))
   {
      // Skip some files..
      if (strcmp(Dir->d_name, "lock") == 0 ||
	  strcmp(Dir->d_name, "partial") == 0 ||
	  strcmp(Dir->d_name, "auxfiles") == 0 ||
	  strcmp(Dir->d_name, "lost+found") == 0 ||
	  strcmp(Dir->d_name, ".") == 0 ||
	  strcmp(Dir->d_name, "..") == 0)
	 continue;

      struct stat St;
      if (fstatat(dirfd, Dir->d_name,&St, 0) != 0)
      {
	 _error->Errno("stat",_("Unable to stat %s."),Dir->d_name);
	 closedir(D);
	 return false;
      }

      // Grab the package name
      const char *I = Dir->d_name;
      for (; *I != 0 && *I != '_';I++);
      if (*I != '_')
	 continue;
      std::string Pkg = DeQuoteString(std::string(Dir->d_name,I-Dir->d_name));

      // Grab the version
      const char *Start = I + 1;
      for (I = Start; *I != 0 && *I != '_';I++);
      if (*I != '_')
	 continue;
      std::string Ver = DeQuoteString(std::string(Start,I-Start));

      // Grab the arch
      Start = I + 1;
      for (I = Start; *I != 0 && *I != '.' ;I++);
      if (*I != '.')
	 continue;
      std::string const Arch = DeQuoteString(std::string(Start,I-Start));

      // ignore packages of unconfigured architectures
      if (APT::Configuration::checkArchitecture(Arch) == false)
	 continue;

      // Lookup the package
      pkgCache::PkgIterator P = Cache.FindPkg(Pkg, Arch);
      if (P.end() != true)
      {
	 pkgCache::VerIterator V = P.VersionList();
	 for (; V.end() == false; ++V)
	 {
	    // See if we can fetch this version at all
	    bool IsFetchable = false;
	    for (pkgCache::VerFileIterator J = V.FileList(); 
		 J.end() == false; ++J)
	    {
	       if (CleanInstalled == true &&
		   J.File().Flagged(pkgCache::Flag::NotSource))
		  continue;
	       IsFetchable = true;
	       break;
	    }

	    // See if this version matches the file
	    if (IsFetchable == true && Ver == V.VerStr())
	       break;
	 }

	 // We found a match, keep the file
	 if (V.end() == false)
	    continue;
      }

      if (withoutChangingDir == nullptr)
      {
	 APT_IGNORE_DEPRECATED_PUSH
	 Erase(Dir->d_name, Pkg, Ver, St);
	 APT_IGNORE_DEPRECATED_POP
      }
      else
	 withoutChangingDir->Erase(dirfd, Dir->d_name, Pkg, Ver, St);
   }
   closedir(D);
   if (withoutChangingDir == nullptr && chdir(CWD.c_str()) != 0)
      return _error->Errno("chdir", _("Unable to change to %s"),Dir.c_str());
   return true;
}
									/*}}}*/

pkgArchiveCleaner::pkgArchiveCleaner() : d(NULL) {}
pkgArchiveCleaner::~pkgArchiveCleaner() {}