/usr/include/apt-pkg/pkgsystem.h is in libapt-pkg-dev 1.0.1ubuntu2.19.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// Description /*{{{*/
// $Id: pkgsystem.h,v 1.6 2002/11/11 06:55:50 doogie Exp $
/* ######################################################################
System - Abstraction for running on different systems.
Instances of this class can be thought of as factories or meta-classes
for a variety of more specialized classes. Together this class and
it's specialized offspring completely define the environment and how
to access resources for a specific system. There are several sub
areas that are all orthogonal - each system has a unique combination of
these sub areas:
- Versioning. Different systems have different ideas on versions.
Within a system all sub classes must follow the same versioning
rules.
- Local tool locking to prevent multiple tools from accessing the
same database.
- Candidate Version selection policy - this is probably almost always
managed using a standard APT class
- Actual Package installation
* Indication of what kind of binary formats are supported
- Selection of local 'status' indexes that make up the pkgCache.
It is important to note that the handling of index files is not a
function of the system. Index files are handled through a separate
abstraction - the only requirement is that the index files have the
same idea of versioning as the target system.
Upon startup each supported system instantiates an instance of the
pkgSystem class (using a global constructor) which will make itself
available to the main APT init routine. That routine will select the
proper system and make it the global default.
##################################################################### */
/*}}}*/
#ifndef PKGLIB_PKGSYSTEM_H
#define PKGLIB_PKGSYSTEM_H
#include <apt-pkg/pkgcache.h>
#include <apt-pkg/cacheiterators.h>
#include <vector>
#ifndef APT_8_CLEANER_HEADERS
#include <apt-pkg/depcache.h>
#endif
class pkgDepCache;
class pkgPackageManager;
class pkgVersioningSystem;
class Configuration;
class pkgIndexFile;
class pkgSystem
{
public:
// Global list of supported systems
static pkgSystem **GlobalList;
static unsigned long GlobalListLen;
static pkgSystem *GetSystem(const char *Label);
const char *Label;
pkgVersioningSystem *VS;
/* Prevent other programs from touching shared data not covered by
other locks (cache or state locks) */
virtual bool Lock() = 0;
virtual bool UnLock(bool NoErrors = false) = 0;
/* Various helper classes to interface with specific bits of this
environment */
virtual pkgPackageManager *CreatePM(pkgDepCache *Cache) const = 0;
/* Load environment specific configuration and perform any other setup
necessary */
virtual bool Initialize(Configuration &/*Cnf*/) {return true;};
/* Type is some kind of Globally Unique way of differentiating
archive file types.. */
virtual bool ArchiveSupported(const char *Type) = 0;
// Return a list of system index files..
virtual bool AddStatusFiles(std::vector<pkgIndexFile *> &List) = 0;
virtual bool FindIndex(pkgCache::PkgFileIterator File,
pkgIndexFile *&Found) const = 0;
/* Evauluate how 'right' we are for this system based on the filesystem
etc.. */
virtual signed Score(Configuration const &/*Cnf*/) {return 0;};
pkgSystem();
virtual ~pkgSystem() {};
};
// The environment we are operating in.
extern pkgSystem *_system;
#endif
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