-// -*- mode: cpp; mode: fold -*-
+// -*- mode: c++; mode: fold -*-
// Description /*{{{*/
// $Id: depcache.h,v 1.14 2001/02/20 07:03:17 jgg Exp $
/* ######################################################################
#include <apt-pkg/pkgcache.h>
#include <apt-pkg/progress.h>
+#include <regex.h>
+
+#include <vector>
+
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.
+ */
+ void MarkPackage(const pkgCache::PkgIterator &pkg,
+ const pkgCache::VerIterator &ver,
+ bool follow_recommends,
+ bool follow_suggests);
+
+ /** \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 occured.
+ */
+ 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 occured.
+ */
+ bool Sweep();
+
+ public:
// These flags are used in DepState
enum DepFlags {DepNow = (1 << 0),DepInstall = (1 << 1),DepCVer = (1 << 2),
enum VersionTypes {NowVersion, InstallVersion, CandidateVersion};
enum ModeList {ModeDelete = 0, ModeKeep = 1, ModeInstall = 2};
+ /** \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
+ {
+ pkgDepCache &cache;
+
+ bool released;
+
+ /** Action groups are noncopyable. */
+ 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.
+ */
+ ActionGroup(pkgDepCache &cache);
+
+ /** \brief Clean up the action group before it is destroyed.
+ *
+ * If it is destroyed later, no second cleanup wil be run.
+ */
+ void release();
+
+ /** \brief Destroy the action group.
+ *
+ * If this is the last action group, the automatic cache
+ * cleanup operations will be undertaken.
+ */
+ ~ActionGroup();
+ };
+
+ /** \brief Returns \b true for packages matching a regular
+ * expression in APT::NeverAutoRemove.
+ */
+ class DefaultRootSetFunc : public InRootSetFunc
+ {
+ std::vector<regex_t *> rootSetRegexp;
+ bool constructedSuccessfully;
+
+ public:
+ DefaultRootSetFunc();
+ ~DefaultRootSetFunc();
+
+ /** \return \b true if the class initialized successfully, \b
+ * false otherwise. Used to avoid throwing an exception, since
+ * APT classes generally don't.
+ */
+ bool wasConstructedSuccessfully() const { return constructedSuccessfully; }
+
+ bool InRootSet(const pkgCache::PkgIterator &pkg);
+ };
+
struct StateCache
{
// Epoch stripped text versions of the two version fields
unsigned short Flags;
unsigned short iFlags; // Internal flags
- // mark and sweep 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
virtual ~Policy() {};
};
+
+ 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:
inline StateCache &operator [](PkgIterator const &I) {return PkgState[I->ID];};
inline unsigned char &operator [](DepIterator const &I) {return DepState[I->ID];};
- // Manipulators
- void MarkKeep(PkgIterator const &Pkg,bool Soft = false);
+ /** \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 #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)
+ {
+ return MarkRequired(rootFunc) && Sweep();
+ }
+
+ bool MarkAndSweep()
+ {
+ std::auto_ptr<InRootSetFunc> f(GetRootSetFunc());
+ if(f.get() != NULL)
+ return MarkAndSweep(*f.get());
+ else
+ return false;
+ }
+
+ /** \name State Manipulators
+ */
+ // @{
+ void MarkKeep(PkgIterator const &Pkg, bool Soft = false,
+ bool FromUser = true);
void MarkDelete(PkgIterator const &Pkg,bool Purge = false);
void MarkInstall(PkgIterator const &Pkg,bool AutoInst = true,
- unsigned long Depth = 0);
+ unsigned long Depth = 0, bool FromUser = true);
void SetReInstall(PkgIterator const &Pkg,bool To);
void SetCandidateVersion(VerIterator TargetVer);
+
+ /** Set the "is automatically installed" flag of Pkg. */
+ void MarkAuto(const PkgIterator &Pkg, bool Auto);
+ // @}
// This is for debuging
void Update(OpProgress *Prog = 0);
projects / apt.git / blobdiff