diff options
Diffstat (limited to 'apt-pkg/policy.h')
-rw-r--r-- | apt-pkg/policy.h | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/apt-pkg/policy.h b/apt-pkg/policy.h new file mode 100644 index 000000000..943332bbb --- /dev/null +++ b/apt-pkg/policy.h @@ -0,0 +1,97 @@ +// -*- mode: cpp; mode: fold -*- +// Description /*{{{*/ +/* ###################################################################### + + Package Version Policy implementation + + This implements the more advanced 'Version 4' APT policy engine. The + standard 'Version 0' engine is included inside the DepCache which is + it's historical location. + + The V4 engine allows the user to completely control all aspects of + version selection. There are three primary means to choose a version + * Selection by version match + * Selection by Release file match + * Selection by origin server + + Each package may be 'pinned' with a single criteria, which will ultimately + result in the selection of a single version, or no version, for each + package. + + Furthermore, the default selection can be influenced by specifying + the ordering of package files. The order is derived by reading the + package file preferences and assigning a priority to each package + file. + + A special flag may be set to indicate if no version should be returned + if no matching versions are found, otherwise the default matching + rules are used to locate a hit. + + ##################################################################### */ + /*}}}*/ +#ifndef PKGLIB_POLICY_H +#define PKGLIB_POLICY_H + +#include <apt-pkg/depcache.h> +#include <apt-pkg/pkgcache.h> +#include <apt-pkg/cacheiterators.h> +#include <apt-pkg/versionmatch.h> + +#include <vector> +#include <string> + +#ifndef APT_8_CLEANER_HEADERS +using std::vector; +#endif + +class pkgPolicy : public pkgDepCache::Policy +{ + protected: + + struct Pin + { + pkgVersionMatch::MatchType Type; + std::string Data; + signed short Priority; + Pin() : Type(pkgVersionMatch::None), Priority(0) {}; + }; + + struct PkgPin : Pin + { + std::string Pkg; + explicit PkgPin(std::string const &Pkg) : Pin(), Pkg(Pkg) {}; + }; + + Pin *Pins; + Pin *VerPins; + signed short *PFPriority; + std::vector<Pin> Defaults; + std::vector<PkgPin> Unmatched; + pkgCache *Cache; + bool StatusOverride; + + public: + + // Things for manipulating pins + void CreatePin(pkgVersionMatch::MatchType Type,std::string Pkg, + std::string Data,signed short Priority); + pkgCache::VerIterator GetMatch(pkgCache::PkgIterator const &Pkg); + + // Things for the cache interface. + virtual pkgCache::VerIterator GetCandidateVer(pkgCache::PkgIterator const &Pkg) APT_OVERRIDE; + virtual signed short GetPriority(pkgCache::PkgIterator const &Pkg) APT_OVERRIDE; + virtual signed short GetPriority(pkgCache::VerIterator const &Ver, bool ConsiderFiles = true) APT_OVERRIDE; + virtual signed short GetPriority(pkgCache::PkgFileIterator const &File) APT_OVERRIDE; + + bool InitDefaults(); + + explicit pkgPolicy(pkgCache *Owner); + virtual ~pkgPolicy(); + private: + void * const d; +}; + +bool ReadPinFile(pkgPolicy &Plcy, std::string File = ""); +bool ReadPinDir(pkgPolicy &Plcy, std::string Dir = ""); + +#endif |