| 1 | // -*- mode: cpp; mode: fold -*- |
| 2 | // Description /*{{{*/ |
| 3 | // $Id: policy.h,v 1.4 2001/05/07 04:24:08 jgg Exp $ |
| 4 | /* ###################################################################### |
| 5 | |
| 6 | Package Version Policy implementation |
| 7 | |
| 8 | This implements the more advanced 'Version 4' APT policy engine. The |
| 9 | standard 'Version 0' engine is included inside the DepCache which is |
| 10 | it's historical location. |
| 11 | |
| 12 | The V4 engine allows the user to completly control all aspects of |
| 13 | version selection. There are three primary means to choose a version |
| 14 | * Selection by version match |
| 15 | * Selection by Release file match |
| 16 | * Selection by origin server |
| 17 | |
| 18 | Each package may be 'pinned' with a single criteria, which will ultimately |
| 19 | result in the selection of a single version, or no version, for each |
| 20 | package. |
| 21 | |
| 22 | Furthermore, the default selection can be influenced by specifying |
| 23 | the ordering of package files. The order is derived by reading the |
| 24 | package file preferences and assigning a priority to each package |
| 25 | file. |
| 26 | |
| 27 | A special flag may be set to indicate if no version should be returned |
| 28 | if no matching versions are found, otherwise the default matching |
| 29 | rules are used to locate a hit. |
| 30 | |
| 31 | ##################################################################### */ |
| 32 | /*}}}*/ |
| 33 | #ifndef PKGLIB_POLICY_H |
| 34 | #define PKGLIB_POLICY_H |
| 35 | |
| 36 | #include <apt-pkg/depcache.h> |
| 37 | #include <apt-pkg/pkgcache.h> |
| 38 | #include <apt-pkg/cacheiterators.h> |
| 39 | #include <apt-pkg/versionmatch.h> |
| 40 | |
| 41 | #include <vector> |
| 42 | #include <string> |
| 43 | |
| 44 | #ifndef APT_8_CLEANER_HEADERS |
| 45 | using std::vector; |
| 46 | #endif |
| 47 | |
| 48 | class pkgPolicy : public pkgDepCache::Policy |
| 49 | { |
| 50 | protected: |
| 51 | |
| 52 | struct Pin |
| 53 | { |
| 54 | pkgVersionMatch::MatchType Type; |
| 55 | std::string Data; |
| 56 | signed short Priority; |
| 57 | Pin() : Type(pkgVersionMatch::None), Priority(0) {}; |
| 58 | }; |
| 59 | |
| 60 | struct PkgPin : Pin |
| 61 | { |
| 62 | std::string Pkg; |
| 63 | PkgPin(std::string const &Pkg) : Pin(), Pkg(Pkg) {}; |
| 64 | }; |
| 65 | |
| 66 | Pin *Pins; |
| 67 | signed short *PFPriority; |
| 68 | std::vector<Pin> Defaults; |
| 69 | std::vector<PkgPin> Unmatched; |
| 70 | pkgCache *Cache; |
| 71 | bool StatusOverride; |
| 72 | |
| 73 | public: |
| 74 | |
| 75 | // Things for manipulating pins |
| 76 | void CreatePin(pkgVersionMatch::MatchType Type,std::string Pkg, |
| 77 | std::string Data,signed short Priority); |
| 78 | pkgCache::VerIterator GetMatch(pkgCache::PkgIterator const &Pkg); |
| 79 | |
| 80 | // Things for the cache interface. |
| 81 | virtual pkgCache::VerIterator GetCandidateVer(pkgCache::PkgIterator const &Pkg); |
| 82 | virtual signed short GetPriority(pkgCache::PkgIterator const &Pkg); |
| 83 | virtual signed short GetPriority(pkgCache::PkgFileIterator const &File); |
| 84 | |
| 85 | bool InitDefaults(); |
| 86 | |
| 87 | pkgPolicy(pkgCache *Owner); |
| 88 | virtual ~pkgPolicy() {delete [] PFPriority; delete [] Pins;}; |
| 89 | }; |
| 90 | |
| 91 | bool ReadPinFile(pkgPolicy &Plcy, std::string File = ""); |
| 92 | bool ReadPinDir(pkgPolicy &Plcy, std::string Dir = ""); |
| 93 | |
| 94 | #endif |