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| -rw-r--r-- | apt-pkg/depcache.h | 528 |
1 files changed, 528 insertions, 0 deletions
diff --git a/apt-pkg/depcache.h b/apt-pkg/depcache.h new file mode 100644 index 0000000..724bf56 --- /dev/null +++ b/apt-pkg/depcache.h @@ -0,0 +1,528 @@ +// -*- mode: c++; mode: fold -*- +// Description /*{{{*/ +/* ###################################################################### + + DepCache - Dependency Extension data for the cache + + This class stores the cache data and a set of extension structures for + monitoring the current state of all the packages. It also generates and + caches the 'install' state of many things. This refers to the state of the + package after an install has been run. + + The StateCache::State field can be -1,0,1,2 which is <,=,>,no current. + StateCache::Mode is which of the 3 fields is active. + + This structure is important to support the readonly status of the cache + file. When the data is saved the cache will be refereshed from our + internal rep and written to disk. Then the actual persistent data + files will be put on the disk. + + Each dependency is compared against 3 target versions to produce to + 3 dependency results. + Now - Compared using the Currently install version + Install - Compared using the install version (final state) + CVer - (Candidate Version) Compared using the Candidate Version + The candidate and now results are used to decide whether a package + should be automatically installed or if it should be left alone. + + Remember, the Candidate Version is selected based on the distribution + settings for the Package. The Install Version is selected based on the + state (Delete, Keep, Install) field and can be either the Current Version + or the Candidate version. + + The Candidate version is what is shown the 'Install Version' field. + + ##################################################################### */ + /*}}}*/ +#ifndef PKGLIB_DEPCACHE_H +#define PKGLIB_DEPCACHE_H + +#include <apt-pkg/configuration.h> +#include <apt-pkg/macros.h> +#include <apt-pkg/pkgcache.h> + +#include <stddef.h> + +#include <list> +#include <memory> +#include <string> +#include <utility> + +#ifndef APT_8_CLEANER_HEADERS +#include <apt-pkg/error.h> +#include <apt-pkg/progress.h> +#endif +#ifndef APT_10_CLEANER_HEADERS +#include <set> +#include <vector> +#endif + +class OpProgress; +class pkgVersioningSystem; + +class pkgDepCache : protected pkgCache::Namespace +{ + public: + + /** \brief An arbitrary predicate on packages. */ + class InRootSetFunc + { + public: + virtual bool InRootSet(const pkgCache::PkgIterator &/*pkg*/) {return false;}; + virtual ~InRootSetFunc() {}; + }; + + private: + /** \brief Mark a single package and all its unmarked important + * dependencies during mark-and-sweep. + * + * Recursively invokes itself to mark all dependencies of the + * package. + * + * \param pkg The package to mark. + * + * \param ver The version of the package that is to be marked. + * + * \param follow_recommends If \b true, recommendations of the + * package will be recursively marked. + * + * \param follow_suggests If \b true, suggestions of the package + * will be recursively marked. + * + * \param reason The reason why the package is being marked. + * (Used in logging when Debug::pkgAutoRemove is set.) + */ + APT_HIDDEN void MarkPackage(const pkgCache::PkgIterator &pkg, + const pkgCache::VerIterator &ver, + bool const &follow_recommends, + bool const &follow_suggests, + const char *reason); + + /** \brief Update the Marked field of all packages. + * + * Each package's StateCache::Marked field will be set to \b true + * if and only if it can be reached from the root set. By + * default, the root set consists of the set of manually installed + * or essential packages, but it can be extended using the + * parameter #rootFunc. + * + * \param rootFunc A callback that can be used to add extra + * packages to the root set. + * + * \return \b false if an error occurred. + */ + bool MarkRequired(InRootSetFunc &rootFunc); + + /** \brief Set the StateCache::Garbage flag on all packages that + * should be removed. + * + * Packages that were not marked by the last call to #MarkRequired + * are tested to see whether they are actually garbage. If so, + * they are marked as such. + * + * \return \b false if an error occurred. + */ + bool Sweep(); + + public: + + // These flags are used in DepState + enum DepFlags {DepNow = (1 << 0),DepInstall = (1 << 1),DepCVer = (1 << 2), + DepGNow = (1 << 3),DepGInstall = (1 << 4),DepGCVer = (1 << 5)}; + + // These flags are used in StateCache::DepState + enum DepStateFlags {DepNowPolicy = (1 << 0), DepNowMin = (1 << 1), + DepInstPolicy = (1 << 2), DepInstMin = (1 << 3), + DepCandPolicy = (1 << 4), DepCandMin = (1 << 5)}; + + // These flags are used in StateCache::iFlags + enum InternalFlags {AutoKept = (1 << 0), Purge = (1 << 1), ReInstall = (1 << 2), Protected = (1 << 3)}; + + enum VersionTypes {NowVersion, InstallVersion, CandidateVersion}; + enum ModeList {ModeDelete = 0, ModeKeep = 1, ModeInstall = 2, ModeGarbage = 3}; + + /** \brief Represents an active action group. + * + * An action group is a group of actions that are currently being + * performed. While an active group is active, certain routine + * clean-up actions that would normally be performed after every + * cache operation are delayed until the action group is + * completed. This is necessary primarily to avoid inefficiencies + * when modifying a large number of packages at once. + * + * This class represents an active action group. Creating an + * instance will create an action group; destroying one will + * destroy the corresponding action group. + * + * The following operations are suppressed by this class: + * + * - Keeping the Marked and Garbage flags up to date. + * + * \note This can be used in the future to easily accumulate + * atomic actions for undo or to display "what apt did anyway"; + * e.g., change the counter of how many action groups are active + * to a std::set of pointers to them and use those to store + * information about what happened in a group in the group. + */ + class ActionGroup + { + void * const d; + pkgDepCache &cache; + + bool released; + + /** Action groups are noncopyable. */ + APT_HIDDEN ActionGroup(const ActionGroup &other); + public: + /** \brief Create a new ActionGroup. + * + * \param cache The cache that this ActionGroup should + * manipulate. + * + * As long as this object exists, no automatic cleanup + * operations will be undertaken. + */ + explicit ActionGroup(pkgDepCache &cache); + + /** \brief Clean up the action group before it is destroyed. + * + * If it is destroyed later, no second cleanup will be run. + */ + void release(); + + /** \brief Destroy the action group. + * + * If this is the last action group, the automatic cache + * cleanup operations will be undertaken. + */ + virtual ~ActionGroup(); + }; + + /** \brief Returns \b true for packages matching a regular + * expression in APT::NeverAutoRemove. + */ + class DefaultRootSetFunc : public InRootSetFunc, public Configuration::MatchAgainstConfig + { + public: + DefaultRootSetFunc() : Configuration::MatchAgainstConfig("APT::NeverAutoRemove") {}; + virtual ~DefaultRootSetFunc() {}; + + bool InRootSet(const pkgCache::PkgIterator &pkg) APT_OVERRIDE { return pkg.end() == false && Match(pkg.Name()); }; + }; + + struct StateCache + { + // text versions of the two version fields + const char *CandVersion; + const char *CurVersion; + + // Pointer to the candidate install version. + Version *CandidateVer; + + // Pointer to the install version. + Version *InstallVer; + + // Copy of Package::Flags + unsigned short Flags; + unsigned short iFlags; // Internal flags + + /** \brief \b true if this package can be reached from the root set. */ + bool Marked; + + /** \brief \b true if this package is unused and should be removed. + * + * This differs from !#Marked, because it is possible that some + * unreachable packages will be protected from becoming + * garbage. + */ + bool Garbage; + + // Various tree indicators + signed char Status; // -1,0,1,2 + unsigned char Mode; // ModeList + unsigned char DepState; // DepState Flags + + // Update of candidate version + APT_DEPRECATED_MSG("Use the method of the same name in contrib/strutl.h instead if you must") const char *StripEpoch(const char *Ver) APT_PURE; + void Update(PkgIterator Pkg,pkgCache &Cache); + + // Various test members for the current status of the package + inline bool NewInstall() const {return Status == 2 && Mode == ModeInstall;}; + inline bool Delete() const {return Mode == ModeDelete;}; + inline bool Purge() const {return Delete() == true && (iFlags & pkgDepCache::Purge) == pkgDepCache::Purge; }; + inline bool Keep() const {return Mode == ModeKeep;}; + inline bool Protect() const {return (iFlags & Protected) == Protected;}; + inline bool Upgrade() const {return Status > 0 && Mode == ModeInstall;}; + inline bool Upgradable() const {return Status >= 1 && CandidateVer != NULL;}; + inline bool Downgrade() const {return Status < 0 && Mode == ModeInstall;}; + inline bool Held() const {return Status != 0 && Keep();}; + inline bool NowBroken() const {return (DepState & DepNowMin) != DepNowMin;}; + inline bool NowPolicyBroken() const {return (DepState & DepNowPolicy) != DepNowPolicy;}; + inline bool InstBroken() const {return (DepState & DepInstMin) != DepInstMin;}; + inline bool InstPolicyBroken() const {return (DepState & DepInstPolicy) != DepInstPolicy;}; + inline bool Install() const {return Mode == ModeInstall;}; + inline bool ReInstall() const {return Delete() == false && (iFlags & pkgDepCache::ReInstall) == pkgDepCache::ReInstall;}; + inline VerIterator InstVerIter(pkgCache &Cache) + {return VerIterator(Cache,InstallVer);}; + inline VerIterator CandidateVerIter(pkgCache &Cache) + {return VerIterator(Cache,CandidateVer);}; + }; + + // Helper functions + void BuildGroupOrs(VerIterator const &V); + void UpdateVerState(PkgIterator const &Pkg); + + // User Policy control + class Policy + { + public: + Policy() { + InstallRecommends = _config->FindB("APT::Install-Recommends", false); + InstallSuggests = _config->FindB("APT::Install-Suggests", false); + } + + virtual VerIterator GetCandidateVer(PkgIterator const &Pkg); + virtual bool IsImportantDep(DepIterator const &Dep) const; + virtual signed short GetPriority(PkgIterator const &Pkg); + virtual signed short GetPriority(VerIterator const &Ver, bool ConsiderFiles=true); + virtual signed short GetPriority(PkgFileIterator const &File); + + virtual ~Policy() {}; + + private: + bool InstallRecommends; + bool InstallSuggests; + }; + + private: + /** The number of open "action groups"; certain post-action + * operations are suppressed if this number is > 0. + */ + int group_level; + + friend class ActionGroup; + + protected: + + // State information + pkgCache *Cache; + StateCache *PkgState; + unsigned char *DepState; + + /** Stores the space changes after installation */ + signed long long iUsrSize; + /** Stores how much we need to download to get the packages */ + unsigned long long iDownloadSize; + unsigned long iInstCount; + unsigned long iDelCount; + unsigned long iKeepCount; + unsigned long iBrokenCount; + unsigned long iPolicyBrokenCount; + unsigned long iBadCount; + + bool DebugMarker; + bool DebugAutoInstall; + + Policy *delLocalPolicy; // For memory clean up.. + Policy *LocalPolicy; + + // Check for a matching provides + bool CheckDep(DepIterator const &Dep,int const Type,PkgIterator &Res); + inline bool CheckDep(DepIterator const &Dep,int const Type) + { + PkgIterator Res(*this,0); + return CheckDep(Dep,Type,Res); + } + + // Computes state information for deps and versions (w/o storing) + unsigned char DependencyState(DepIterator const &D); + unsigned char VersionState(DepIterator D,unsigned char const Check, + unsigned char const SetMin, + unsigned char const SetPolicy) const; + + // Recalculates various portions of the cache, call after changing something + void Update(DepIterator Dep); // Mostly internal + void Update(PkgIterator const &P); + + // Count manipulators + void AddSizes(const PkgIterator &Pkg, bool const Invert = false); + inline void RemoveSizes(const PkgIterator &Pkg) {AddSizes(Pkg, true);}; + void AddStates(const PkgIterator &Pkg, bool const Invert = false); + inline void RemoveStates(const PkgIterator &Pkg) {AddStates(Pkg,true);}; + + public: + + // Legacy.. We look like a pkgCache + inline operator pkgCache &() {return *Cache;}; + inline Header &Head() {return *Cache->HeaderP;}; + inline GrpIterator GrpBegin() {return Cache->GrpBegin();}; + inline PkgIterator PkgBegin() {return Cache->PkgBegin();}; + inline GrpIterator FindGrp(std::string const &Name) {return Cache->FindGrp(Name);}; + inline PkgIterator FindPkg(std::string const &Name) {return Cache->FindPkg(Name);}; + inline PkgIterator FindPkg(std::string const &Name, std::string const &Arch) {return Cache->FindPkg(Name, Arch);}; + + inline pkgCache &GetCache() {return *Cache;}; + inline pkgVersioningSystem &VS() {return *Cache->VS;}; + + // Policy implementation + APT_DEPRECATED_MSG("Confusingly named method which returns the candidate as chosen by policy (NOT as chosen via .SetCandidateVersion!). You probably want to use .GetCandidateVersion instead.") inline VerIterator GetCandidateVer(PkgIterator const &Pkg) {return /* GetCandidateVersion(Pkg); but for API compat: */ LocalPolicy->GetCandidateVer(Pkg);}; + + inline bool IsImportantDep(DepIterator Dep) const {return LocalPolicy->IsImportantDep(Dep);}; + inline Policy &GetPolicy() {return *LocalPolicy;}; + + // Accessors + inline StateCache &operator [](PkgIterator const &I) {return PkgState[I->ID];}; + inline StateCache &operator [](PkgIterator const &I) const {return PkgState[I->ID];}; + inline unsigned char &operator [](DepIterator const &I) {return DepState[I->ID];}; + + /** \return A function identifying packages in the root set other + * than manually installed packages and essential packages, or \b + * NULL if an error occurs. + * + * \todo Is this the best place for this function? Perhaps the + * settings for mark-and-sweep should be stored in a single + * external class? + */ + virtual InRootSetFunc *GetRootSetFunc(); + + /** \return \b true if the garbage collector should follow recommendations. + */ + virtual bool MarkFollowsRecommends(); + + /** \return \b true if the garbage collector should follow suggestions. + */ + virtual bool MarkFollowsSuggests(); + + /** \brief Update the Marked and Garbage fields of all packages. + * + * This routine is implicitly invoked after all state manipulators + * and when an ActionGroup is destroyed. It invokes the private + * MarkRequired() and Sweep() to do its dirty work. + * + * \param rootFunc A predicate that returns \b true for packages + * that should be added to the root set. + */ + bool MarkAndSweep(InRootSetFunc &rootFunc); + bool MarkAndSweep(); + + /** \name State Manipulators + */ + // @{ + bool MarkKeep(PkgIterator const &Pkg, bool Soft = false, + bool FromUser = true, unsigned long Depth = 0); + bool MarkDelete(PkgIterator const &Pkg, bool MarkPurge = false, + unsigned long Depth = 0, bool FromUser = true); + bool MarkInstall(PkgIterator const &Pkg,bool AutoInst = true, + unsigned long Depth = 0, bool FromUser = true, + bool ForceImportantDeps = false); + void MarkProtected(PkgIterator const &Pkg) { PkgState[Pkg->ID].iFlags |= Protected; }; + + void SetReInstall(PkgIterator const &Pkg,bool To); + + /** @return 'the' candidate version of a package + * + * The version returned is the version previously set explicitly via + * SetCandidate* methods like #SetCandidateVersion or if there wasn't one + * set the version as chosen via #Policy. + * + * @param Pkg is the package to return the candidate for + */ + pkgCache::VerIterator GetCandidateVersion(pkgCache::PkgIterator const &Pkg); + void SetCandidateVersion(VerIterator TargetVer); + bool SetCandidateRelease(pkgCache::VerIterator TargetVer, + std::string const &TargetRel); + /** Set the candidate version for dependencies too if needed. + * + * Sets not only the candidate version as SetCandidateVersion does, + * but walks also down the dependency tree and checks if it is required + * to set the candidate of the dependency to a version from the given + * release, too. + * + * \param TargetVer new candidate version of the package + * \param TargetRel try to switch to this release if needed + * \param[out] Changed a list of pairs consisting of the \b old + * version of the changed package and the version which + * required the switch of this dependency + * \return \b true if the switch was successful, \b false otherwise + */ + bool SetCandidateRelease(pkgCache::VerIterator TargetVer, + std::string const &TargetRel, + std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> > &Changed); + + /** Set the "is automatically installed" flag of Pkg. */ + void MarkAuto(const PkgIterator &Pkg, bool Auto); + // @} + + /** \return \b true if it's OK for MarkInstall to install + * the given package. + * + * The default implementation simply calls all IsInstallOk* + * method mentioned below. + * + * Overriding implementations should use the hold-state-flag to + * cache results from previous checks of this package - if possible. + * + * The parameters are the same as in the calling MarkInstall: + * \param Pkg the package that MarkInstall wants to install. + * \param AutoInst install this and all its dependencies + * \param Depth recursive deep of this Marker call + * \param FromUser was the install requested by the user? + */ + virtual bool IsInstallOk(const PkgIterator &Pkg,bool AutoInst = true, + unsigned long Depth = 0, bool FromUser = true); + + /** \return \b true if it's OK for MarkDelete to remove + * the given package. + * + * The default implementation simply calls all IsDeleteOk* + * method mentioned below, see also #IsInstallOk. + * + * The parameters are the same as in the calling MarkDelete: + * \param Pkg the package that MarkDelete wants to remove. + * \param MarkPurge should we purge instead of "only" remove? + * \param Depth recursive deep of this Marker call + * \param FromUser was the remove requested by the user? + */ + virtual bool IsDeleteOk(const PkgIterator &Pkg,bool MarkPurge = false, + unsigned long Depth = 0, bool FromUser = true); + + // read persistent states + bool readStateFile(OpProgress * const prog); + bool writeStateFile(OpProgress * const prog, bool const InstalledOnly=true); + + // Size queries + inline signed long long UsrSize() {return iUsrSize;}; + inline unsigned long long DebSize() {return iDownloadSize;}; + inline unsigned long DelCount() {return iDelCount;}; + inline unsigned long KeepCount() {return iKeepCount;}; + inline unsigned long InstCount() {return iInstCount;}; + inline unsigned long BrokenCount() {return iBrokenCount;}; + inline unsigned long PolicyBrokenCount() {return iPolicyBrokenCount;}; + inline unsigned long BadCount() {return iBadCount;}; + + bool Init(OpProgress * const Prog); + // Generate all state information + void Update(OpProgress * const Prog = 0); + + pkgDepCache(pkgCache * const Cache,Policy * const Plcy = 0); + virtual ~pkgDepCache(); + + protected: + // methods call by IsInstallOk + bool IsInstallOkMultiArchSameVersionSynced(PkgIterator const &Pkg, + bool const AutoInst, unsigned long const Depth, bool const FromUser); + bool IsInstallOkDependenciesSatisfiableByCandidates(PkgIterator const &Pkg, + bool const AutoInst, unsigned long const Depth, bool const FromUser); + + // methods call by IsDeleteOk + bool IsDeleteOkProtectInstallRequests(PkgIterator const &Pkg, + bool const rPurge, unsigned long const Depth, bool const FromUser); + + private: + void * const d; + + APT_HIDDEN bool IsModeChangeOk(ModeList const mode, PkgIterator const &Pkg, + unsigned long const Depth, bool const FromUser); +}; + +#endif |