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authorArch Librarian <arch@canonical.com>2004-09-20 16:56:32 +0000
committerArch Librarian <arch@canonical.com>2004-09-20 16:56:32 +0000
commitb2e465d6d32d2dc884f58b94acb7e35f671a87fe (patch)
tree5928383b9bde7b0ba9812e6526ad746466e558f7 /apt-inst/deb/debfile.cc
parent00b47c98ca4a4349686a082eba6d77decbb03a4d (diff)
Join with aliencode
Author: jgg Date: 2001-02-20 07:03:16 GMT Join with aliencode
Diffstat (limited to 'apt-inst/deb/debfile.cc')
-rw-r--r--apt-inst/deb/debfile.cc262
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+// -*- mode: cpp; mode: fold -*-
+// Description /*{{{*/
+// $Id: debfile.cc,v 1.2 2001/02/20 07:03:17 jgg Exp $
+/* ######################################################################
+
+ Debian Archive File (.deb)
+
+ .DEB archives are AR files containing two tars and an empty marker
+ member called 'debian-binary'. The two tars contain the meta data and
+ the actual archive contents. Thus this class is a very simple wrapper
+ around ar/tar to simply extract the right tar files.
+
+ It also uses the deb package list parser to parse the control file
+ into the cache.
+
+ ##################################################################### */
+ /*}}}*/
+// Include Files /*{{{*/
+#ifdef __GNUG__
+#pragma implementation "apt-pkg/debfile.h"
+#endif
+
+#include <apt-pkg/debfile.h>
+#include <apt-pkg/extracttar.h>
+#include <apt-pkg/error.h>
+#include <apt-pkg/deblistparser.h>
+
+#include <sys/stat.h>
+#include <unistd.h>
+ /*}}}*/
+
+// DebFile::debDebFile - Constructor /*{{{*/
+// ---------------------------------------------------------------------
+/* Open the AR file and check for consistency */
+debDebFile::debDebFile(FileFd &File) : File(File), AR(File)
+{
+ if (_error->PendingError() == true)
+ return;
+
+ // Check the members for validity
+ if (CheckMember("debian-binary") == false ||
+ CheckMember("control.tar.gz") == false ||
+ CheckMember("data.tar.gz") == false)
+ return;
+}
+ /*}}}*/
+// DebFile::CheckMember - Check if a named member is in the archive /*{{{*/
+// ---------------------------------------------------------------------
+/* This is used to check for a correct deb and to give nicer error messages
+ for people playing around. */
+bool debDebFile::CheckMember(const char *Name)
+{
+ if (AR.FindMember(Name) == 0)
+ return _error->Error("This is not a valid DEB archive, missing '%s' member",Name);
+ return true;
+}
+ /*}}}*/
+// DebFile::GotoMember - Jump to a Member /*{{{*/
+// ---------------------------------------------------------------------
+/* Jump in the file to the start of a named member and return the information
+ about that member. The caller can then read from the file up to the
+ returned size. Note, since this relies on the file position this is
+ a destructive operation, it also changes the last returned Member
+ structure - so don't nest them! */
+const ARArchive::Member *debDebFile::GotoMember(const char *Name)
+{
+ // Get the archive member and positition the file
+ const ARArchive::Member *Member = AR.FindMember(Name);
+ if (Member == 0)
+ {
+ _error->Error("Internal Error, could not locate member %s",Name);
+ return 0;
+ }
+ if (File.Seek(Member->Start) == false)
+ return 0;
+
+ return Member;
+}
+ /*}}}*/
+// DebFile::ExtractControl - Extract Control information /*{{{*/
+// ---------------------------------------------------------------------
+/* Extract the control information into the Database's temporary
+ directory. */
+bool debDebFile::ExtractControl(pkgDataBase &DB)
+{
+ // Get the archive member and positition the file
+ const ARArchive::Member *Member = GotoMember("control.tar.gz");
+ if (Member == 0)
+ return false;
+
+ // Prepare Tar
+ ControlExtract Extract;
+ ExtractTar Tar(File,Member->Size);
+ if (_error->PendingError() == true)
+ return false;
+
+ // Get into the temporary directory
+ string Cwd = SafeGetCWD();
+ string Tmp;
+ if (DB.GetMetaTmp(Tmp) == false)
+ return false;
+ if (chdir(Tmp.c_str()) != 0)
+ return _error->Errno("chdir","Couldn't change to %s",Tmp.c_str());
+
+ // Do extraction
+ if (Tar.Go(Extract) == false)
+ return false;
+
+ // Switch out of the tmp directory.
+ if (chdir(Cwd.c_str()) != 0)
+ chdir("/");
+
+ return true;
+}
+ /*}}}*/
+// DebFile::ExtractArchive - Extract the archive data itself /*{{{*/
+// ---------------------------------------------------------------------
+/* Simple wrapper around tar.. */
+bool debDebFile::ExtractArchive(pkgDirStream &Stream)
+{
+ // Get the archive member and positition the file
+ const ARArchive::Member *Member = AR.FindMember("data.tar.gz");
+ if (Member == 0)
+ return _error->Error("Internal Error, could not locate member");
+ if (File.Seek(Member->Start) == false)
+ return false;
+
+ // Prepare Tar
+ ExtractTar Tar(File,Member->Size);
+ if (_error->PendingError() == true)
+ return false;
+ return Tar.Go(Stream);
+}
+ /*}}}*/
+// DebFile::MergeControl - Merge the control information /*{{{*/
+// ---------------------------------------------------------------------
+/* This reads the extracted control file into the cache and returns the
+ version that was parsed. All this really does is select the correct
+ parser and correct file to parse. */
+pkgCache::VerIterator debDebFile::MergeControl(pkgDataBase &DB)
+{
+ // Open the control file
+ string Tmp;
+ if (DB.GetMetaTmp(Tmp) == false)
+ return pkgCache::VerIterator(DB.GetCache());
+ FileFd Fd(Tmp + "control",FileFd::ReadOnly);
+ if (_error->PendingError() == true)
+ return pkgCache::VerIterator(DB.GetCache());
+
+ // Parse it
+ debListParser Parse(&Fd);
+ pkgCache::VerIterator Ver(DB.GetCache());
+ if (DB.GetGenerator().MergeList(Parse,&Ver) == false)
+ return pkgCache::VerIterator(DB.GetCache());
+
+ if (Ver.end() == true)
+ _error->Error("Failed to locate a valid control file");
+ return Ver;
+}
+ /*}}}*/
+
+// DebFile::ControlExtract::DoItem - Control Tar Extraction /*{{{*/
+// ---------------------------------------------------------------------
+/* This directory stream handler for the control tar handles extracting
+ it into the temporary meta directory. It only extracts files, it does
+ not create directories, links or anything else. */
+bool debDebFile::ControlExtract::DoItem(Item &Itm,int &Fd)
+{
+ if (Itm.Type != Item::File)
+ return true;
+
+ /* Cleanse the file name, prevent people from trying to unpack into
+ absolute paths, .., etc */
+ for (char *I = Itm.Name; *I != 0; I++)
+ if (*I == '/')
+ *I = '_';
+
+ /* Force the ownership to be root and ensure correct permissions,
+ go-w, the rest are left untouched */
+ Itm.UID = 0;
+ Itm.GID = 0;
+ Itm.Mode &= ~(S_IWGRP | S_IWOTH);
+
+ return pkgDirStream::DoItem(Itm,Fd);
+}
+ /*}}}*/
+
+// MemControlExtract::DoItem - Check if it is the control file /*{{{*/
+// ---------------------------------------------------------------------
+/* This sets up to extract the control block member file into a memory
+ block of just the right size. All other files go into the bit bucket. */
+bool debDebFile::MemControlExtract::DoItem(Item &Itm,int &Fd)
+{
+ // At the control file, allocate buffer memory.
+ if (Member == Itm.Name)
+ {
+ delete [] Control;
+ Control = new char[Itm.Size+2];
+ IsControl = true;
+ Fd = -2; // Signal to pass to Process
+ Length = Itm.Size;
+ }
+ else
+ IsControl = false;
+
+ return true;
+}
+ /*}}}*/
+// MemControlExtract::Process - Process extracting the control file /*{{{*/
+// ---------------------------------------------------------------------
+/* Just memcopy the block from the tar extractor and put it in the right
+ place in the pre-allocated memory block. */
+bool debDebFile::MemControlExtract::Process(Item &Itm,const unsigned char *Data,
+ unsigned long Size,unsigned long Pos)
+{
+ memcpy(Control + Pos, Data,Size);
+ return true;
+}
+ /*}}}*/
+// MemControlExtract::Read - Read the control information from the deb /*{{{*/
+// ---------------------------------------------------------------------
+/* This uses the internal tar extractor to fetch the control file, and then
+ it parses it into a tag section parser. */
+bool debDebFile::MemControlExtract::Read(debDebFile &Deb)
+{
+ // Get the archive member and positition the file
+ const ARArchive::Member *Member = Deb.GotoMember("control.tar.gz");
+ if (Member == 0)
+ return false;
+
+ // Extract it.
+ ExtractTar Tar(Deb.GetFile(),Member->Size);
+ if (Tar.Go(*this) == false)
+ return false;
+
+ if (Control == 0)
+ return true;
+
+ Control[Length] = '\n';
+ Control[Length+1] = '\n';
+ if (Section.Scan(Control,Length+2) == false)
+ return _error->Error("Unparsible control file");
+ return true;
+}
+ /*}}}*/
+// MemControlExtract::TakeControl - Parse a memory block /*{{{*/
+// ---------------------------------------------------------------------
+/* The given memory block is loaded into the parser and parsed as a control
+ record. */
+bool debDebFile::MemControlExtract::TakeControl(const void *Data,unsigned long Size)
+{
+ delete [] Control;
+ Control = new char[Size+2];
+ Length = Size;
+ memcpy(Control,Data,Size);
+
+ Control[Length] = '\n';
+ Control[Length+1] = '\n';
+ return Section.Scan(Control,Length+2);
+}
+ /*}}}*/
+