mirror of https://gitee.com/openkylin/apt.git
94 lines
2.9 KiB
C++
94 lines
2.9 KiB
C++
// -*- mode: cpp; mode: fold -*-
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// Description /*{{{*/
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/* ######################################################################
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Package Version Policy implementation
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This implements the more advanced 'Version 4' APT policy engine. The
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standard 'Version 0' engine is included inside the DepCache which is
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it's historical location.
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The V4 engine allows the user to completely control all aspects of
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version selection. There are three primary means to choose a version
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* Selection by version match
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* Selection by Release file match
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* Selection by origin server
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Each package may be 'pinned' with a single criteria, which will ultimately
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result in the selection of a single version, or no version, for each
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package.
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Furthermore, the default selection can be influenced by specifying
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the ordering of package files. The order is derived by reading the
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package file preferences and assigning a priority to each package
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file.
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A special flag may be set to indicate if no version should be returned
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if no matching versions are found, otherwise the default matching
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rules are used to locate a hit.
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##################################################################### */
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/*}}}*/
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#ifndef PKGLIB_POLICY_H
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#define PKGLIB_POLICY_H
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#include <apt-pkg/depcache.h>
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#include <apt-pkg/pkgcache.h>
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#include <apt-pkg/versionmatch.h>
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#include <string>
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#include <vector>
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class APT_PUBLIC pkgPolicy : public pkgDepCache::Policy
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{
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protected:
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struct Pin
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{
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pkgVersionMatch::MatchType Type;
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std::string Data;
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signed short Priority;
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Pin() : Type(pkgVersionMatch::None), Priority(0) {};
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};
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struct PkgPin : Pin
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{
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std::string Pkg;
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explicit PkgPin(std::string const &Pkg) : Pin(), Pkg(Pkg) {};
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};
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Pin *VerPins;
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signed short *PFPriority;
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std::vector<Pin> Defaults;
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std::vector<PkgPin> Unmatched;
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pkgCache *Cache;
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bool StatusOverride;
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public:
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// Things for manipulating pins
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void CreatePin(pkgVersionMatch::MatchType Type,std::string Pkg,
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std::string Data,signed short Priority);
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// Things for the cache interface.
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virtual pkgCache::VerIterator GetCandidateVer(pkgCache::PkgIterator const &Pkg) APT_OVERRIDE;
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virtual signed short GetPriority(pkgCache::VerIterator const &Ver, bool ConsiderFiles = true) APT_OVERRIDE;
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virtual signed short GetPriority(pkgCache::PkgFileIterator const &File) APT_OVERRIDE;
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void SetPriority(pkgCache::VerIterator const &Ver, signed short Priority);
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void SetPriority(pkgCache::PkgFileIterator const &File, signed short Priority);
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bool InitDefaults();
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explicit pkgPolicy(pkgCache *Owner);
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virtual ~pkgPolicy();
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private:
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struct Private;
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Private *const d;
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};
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APT_PUBLIC bool ReadPinFile(pkgPolicy &Plcy, std::string File = "");
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APT_PUBLIC bool ReadPinDir(pkgPolicy &Plcy, std::string Dir = "");
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#endif
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