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+// -*- mode: cpp; mode: fold -*-
+// Description /*{{{*/
+/* ######################################################################
+
+ Order List - Represents and Manipulates an ordered list of packages.
+
+ A list of packages can be ordered by a number of conflicting criteria
+ each given a specific priority. Each package also has a set of flags
+ indicating some useful things about it that are derived in the
+ course of sorting. The pkgPackageManager class uses this class for
+ all of it's installation ordering needs.
+
+ This is a modified version of Manoj's Routine B. It consists of four
+ independent ordering algorithms that can be applied at for different
+ points in the ordering. By applying progressivly fewer ordering
+ operations it is possible to give each consideration it's own
+ priority and create an order that satisfies the lowest applicable
+ consideration.
+
+ The rules for unpacking ordering are:
+ 1) Unpacking ignores Depends: on all packages
+ 2) Unpacking requires Conflicts: on -ALL- packages to be satisfied
+ 3) Unpacking requires PreDepends: on this package only to be satisfied
+ 4) Removing requires that no packages depend on the package to be
+ removed.
+
+ And the rule for configuration ordering is:
+ 1) Configuring requires that the Depends: of the package be satisfied
+ Conflicts+PreDepends are ignored because unpacking says they are
+ already correct [exageration, it does check but we need not be
+ concerned]
+
+ And some features that are valuable for unpacking ordering.
+ f1) Unpacking a new package should advoid breaking dependencies of
+ configured packages
+ f2) Removal should not require a force, corrolory of f1
+ f3) Unpacking should order by depends rather than fall back to random
+ ordering.
+
+ Each of the features can be enabled in the sorting routine at an
+ arbitrary priority to give quite abit of control over the final unpacking
+ order.
+
+ The rules listed above may never be violated and are called Critical.
+ When a critical rule is violated then a loop condition is recorded
+ and will have to be delt with in the caller.
+
+ The ordering keeps two lists, the main list and the 'After List'. The
+ purpose of the after list is to allow packages to be delayed. This is done
+ by setting the after flag on the package. Any package which requires this
+ package to be ordered before will inherit the after flag and so on. This
+ is used for CD swap ordering where all packages on a second CD have the
+ after flag set. This forces them and all their dependents to be ordered
+ toward the end.
+
+ There are complications in this algorithm when presented with cycles.
+ For all known practical cases it works, all cases where it doesn't work
+ is fixable by tweaking the package descriptions. However, it should be
+ possible to improve this further to make some better choices when
+ presented with cycles.
+
+ ##################################################################### */
+ /*}}}*/
+// Include Files /*{{{*/
+#include <config.h>
+
+#include <apt-pkg/configuration.h>
+#include <apt-pkg/depcache.h>
+#include <apt-pkg/error.h>
+#include <apt-pkg/orderlist.h>
+#include <apt-pkg/pkgcache.h>
+
+#include <algorithm>
+#include <iostream>
+#include <stdlib.h>
+#include <string.h>
+ /*}}}*/
+
+using namespace std;
+
+// OrderList::pkgOrderList - Constructor /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+pkgOrderList::pkgOrderList(pkgDepCache *pCache) : d(NULL), Cache(*pCache),
+ Primary(NULL), Secondary(NULL),
+ RevDepends(NULL), Remove(NULL),
+ AfterEnd(NULL), FileList(NULL),
+ LoopCount(-1), Depth(0)
+{
+ Debug = _config->FindB("Debug::pkgOrderList",false);
+
+ /* Construct the arrays, egcs 1.0.1 bug requires the package count
+ hack */
+ auto const Size = Cache.Head().PackageCount;
+ Flags = new unsigned short[Size];
+ End = List = new Package *[Size];
+ memset(Flags,0,sizeof(*Flags)*Size);
+}
+ /*}}}*/
+// OrderList::~pkgOrderList - Destructor /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+pkgOrderList::~pkgOrderList()
+{
+ delete [] List;
+ delete [] Flags;
+}
+ /*}}}*/
+// OrderList::IsMissing - Check if a file is missing /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool pkgOrderList::IsMissing(PkgIterator Pkg)
+{
+ // Skip packages to erase
+ if (Cache[Pkg].Delete() == true)
+ return false;
+
+ // Skip Packages that need configure only.
+ if ((Pkg.State() == pkgCache::PkgIterator::NeedsConfigure ||
+ Pkg.State() == pkgCache::PkgIterator::NeedsNothing) &&
+ Cache[Pkg].Keep() == true)
+ return false;
+
+ if (FileList == 0)
+ return false;
+
+ if (FileList[Pkg->ID].empty() == false)
+ return false;
+
+ return true;
+}
+ /*}}}*/
+// OrderList::DoRun - Does an order run /*{{{*/
+// ---------------------------------------------------------------------
+/* The caller is expected to have setup the desired probe state */
+bool pkgOrderList::DoRun()
+{
+ // Temp list
+ unsigned long Size = Cache.Head().PackageCount;
+ std::unique_ptr<Package *[]> NList(new Package *[Size]);
+ std::unique_ptr<Package *[]> AfterList(new Package *[Size]);
+ AfterEnd = AfterList.get();
+
+ Depth = 0;
+ WipeFlags(Added | AddPending | Loop | InList);
+
+ for (iterator I = List; I != End; ++I)
+ Flag(*I,InList);
+
+ // Rebuild the main list into the temp list.
+ iterator OldEnd = End;
+ End = NList.get();
+ for (iterator I = List; I != OldEnd; ++I)
+ if (VisitNode(PkgIterator(Cache,*I), "DoRun") == false)
+ {
+ End = OldEnd;
+ return false;
+ }
+
+ // Copy the after list to the end of the main list
+ for (Package **I = AfterList.get(); I != AfterEnd; I++)
+ *End++ = *I;
+
+ // Swap the main list to the new list
+ delete [] List;
+ List = NList.release();
+ return true;
+}
+ /*}}}*/
+// OrderList::OrderCritical - Perform critical unpacking ordering /*{{{*/
+// ---------------------------------------------------------------------
+/* This performs predepends and immediate configuration ordering only.
+ This is termed critical unpacking ordering. Any loops that form are
+ fatal and indicate that the packages cannot be installed. */
+bool pkgOrderList::OrderCritical()
+{
+ FileList = 0;
+
+ Primary = &pkgOrderList::DepUnPackPreD;
+ Secondary = 0;
+ RevDepends = 0;
+ Remove = 0;
+ LoopCount = 0;
+
+ // Sort
+ std::sort(List,End, [this](Package *a, Package *b) { return OrderCompareB(a, b) < 0; } );
+
+ if (DoRun() == false)
+ return false;
+
+ if (LoopCount != 0)
+ return _error->Error("Fatal, predepends looping detected");
+
+ if (Debug == true)
+ {
+ clog << "** Critical Unpack ordering done" << endl;
+
+ for (iterator I = List; I != End; ++I)
+ {
+ PkgIterator P(Cache,*I);
+ if (IsNow(P) == true)
+ clog << " " << P.FullName() << ' ' << IsMissing(P) << ',' << IsFlag(P,After) << endl;
+ }
+ }
+
+ return true;
+}
+ /*}}}*/
+// OrderList::OrderUnpack - Perform complete unpacking ordering /*{{{*/
+// ---------------------------------------------------------------------
+/* This performs complete unpacking ordering and creates an order that is
+ suitable for unpacking */
+bool pkgOrderList::OrderUnpack(string *FileList)
+{
+ this->FileList = FileList;
+
+ // Setup the after flags
+ if (FileList != 0)
+ {
+ WipeFlags(After);
+
+ // Set the inlist flag
+ for (iterator I = List; I != End; ++I)
+ {
+ PkgIterator P(Cache,*I);
+ if (IsMissing(P) == true && IsNow(P) == true)
+ Flag(*I,After);
+ }
+ }
+
+ Primary = &pkgOrderList::DepUnPackCrit;
+ Secondary = &pkgOrderList::DepConfigure;
+ RevDepends = &pkgOrderList::DepUnPackDep;
+ Remove = &pkgOrderList::DepRemove;
+ LoopCount = -1;
+
+ // Sort
+ std::sort(List,End, [this](Package *a, Package *b) { return OrderCompareA(a, b) < 0; });
+
+ if (Debug == true)
+ clog << "** Pass A" << endl;
+ if (DoRun() == false)
+ return false;
+
+ if (Debug == true)
+ clog << "** Pass B" << endl;
+ Secondary = 0;
+ if (DoRun() == false)
+ return false;
+
+ if (Debug == true)
+ clog << "** Pass C" << endl;
+ LoopCount = 0;
+ RevDepends = 0;
+ Remove = 0; // Otherwise the libreadline remove problem occurs
+ if (DoRun() == false)
+ return false;
+
+ if (Debug == true)
+ clog << "** Pass D" << endl;
+ LoopCount = 0;
+ Primary = &pkgOrderList::DepUnPackPre;
+ if (DoRun() == false)
+ return false;
+
+ if (Debug == true)
+ {
+ clog << "** Unpack ordering done" << endl;
+
+ for (iterator I = List; I != End; ++I)
+ {
+ PkgIterator P(Cache,*I);
+ if (IsNow(P) == true)
+ clog << " " << P.FullName() << ' ' << IsMissing(P) << ',' << IsFlag(P,After) << endl;
+ }
+ }
+
+ return true;
+}
+ /*}}}*/
+// OrderList::OrderConfigure - Perform configuration ordering /*{{{*/
+// ---------------------------------------------------------------------
+/* This orders by depends only and produces an order which is suitable
+ for configuration */
+bool pkgOrderList::OrderConfigure()
+{
+ FileList = 0;
+ Primary = &pkgOrderList::DepConfigure;
+ Secondary = 0;
+ RevDepends = 0;
+ Remove = 0;
+ LoopCount = -1;
+ return DoRun();
+}
+ /*}}}*/
+// OrderList::Score - Score the package for sorting /*{{{*/
+// ---------------------------------------------------------------------
+/* Higher scores order earlier */
+int pkgOrderList::Score(PkgIterator Pkg)
+{
+ // Removals should be done after we dealt with essentials
+ static int const ScoreDelete = _config->FindI("OrderList::Score::Delete", 100);
+ if (Cache[Pkg].Delete() == true)
+ return ScoreDelete;
+
+ // This should never happen..
+ if (Cache[Pkg].InstVerIter(Cache).end() == true)
+ return -1;
+
+ static int const ScoreEssential = _config->FindI("OrderList::Score::Essential", 200);
+ static int const ScoreImmediate = _config->FindI("OrderList::Score::Immediate", 10);
+ static int const ScorePreDepends = _config->FindI("OrderList::Score::PreDepends", 50);
+
+ int Score = 0;
+ if ((Pkg->Flags & pkgCache::Flag::Essential) == pkgCache::Flag::Essential)
+ Score += ScoreEssential;
+
+ if (IsFlag(Pkg,Immediate) == true)
+ Score += ScoreImmediate;
+
+ for (DepIterator D = Cache[Pkg].InstVerIter(Cache).DependsList();
+ D.end() == false; ++D)
+ if (D->Type == pkgCache::Dep::PreDepends)
+ {
+ Score += ScorePreDepends;
+ break;
+ }
+
+ // Required Important Standard Optional Extra
+ if (Cache[Pkg].InstVerIter(Cache)->Priority <= 5)
+ {
+ signed short PrioMap[] = {0,5,4,3,1,0};
+ Score += PrioMap[Cache[Pkg].InstVerIter(Cache)->Priority];
+ }
+ return Score;
+}
+ /*}}}*/
+// OrderList::FileCmp - Compare by package file /*{{{*/
+// ---------------------------------------------------------------------
+/* This compares by the package file that the install version is in. */
+int pkgOrderList::FileCmp(PkgIterator A,PkgIterator B)
+{
+ if (Cache[A].Delete() == true && Cache[B].Delete() == true)
+ return 0;
+ if (Cache[A].Delete() == true)
+ return -1;
+ if (Cache[B].Delete() == true)
+ return 1;
+
+ if (Cache[A].InstVerIter(Cache).FileList().end() == true)
+ return -1;
+ if (Cache[B].InstVerIter(Cache).FileList().end() == true)
+ return 1;
+
+ pkgCache::PackageFile *FA = Cache[A].InstVerIter(Cache).FileList().File();
+ pkgCache::PackageFile *FB = Cache[B].InstVerIter(Cache).FileList().File();
+ if (FA < FB)
+ return -1;
+ if (FA > FB)
+ return 1;
+ return 0;
+}
+ /*}}}*/
+// BoolCompare - Comparison function for two booleans /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+static int BoolCompare(bool A,bool B)
+{
+ if (A == B)
+ return 0;
+ if (A == false)
+ return -1;
+ return 1;
+}
+ /*}}}*/
+// OrderList::OrderCompareA - Order the installation by op /*{{{*/
+// ---------------------------------------------------------------------
+/* This provides a first-pass sort of the list and gives a decent starting
+ point for further complete ordering. It is used by OrderUnpack only */
+int pkgOrderList::OrderCompareA(Package *a, Package *b)
+{
+ PkgIterator A(Cache,a);
+ PkgIterator B(Cache,b);
+
+ // We order packages with a set state toward the front
+ int Res;
+ if ((Res = BoolCompare(IsNow(A),IsNow(B))) != 0)
+ return -1*Res;
+
+ // We order missing files to toward the end
+/* if (FileList != 0)
+ {
+ if ((Res = BoolCompare(IsMissing(A),
+ IsMissing(B))) != 0)
+ return Res;
+ }*/
+
+ if (A.State() != pkgCache::PkgIterator::NeedsNothing &&
+ B.State() == pkgCache::PkgIterator::NeedsNothing)
+ return -1;
+
+ if (A.State() == pkgCache::PkgIterator::NeedsNothing &&
+ B.State() != pkgCache::PkgIterator::NeedsNothing)
+ return 1;
+
+ int ScoreA = Score(A);
+ int ScoreB = Score(B);
+
+ if (ScoreA > ScoreB)
+ return -1;
+
+ if (ScoreA < ScoreB)
+ return 1;
+
+ return strcmp(A.Name(),B.Name());
+}
+ /*}}}*/
+// OrderList::OrderCompareB - Order the installation by source /*{{{*/
+// ---------------------------------------------------------------------
+/* This orders by installation source. This is useful to handle
+ inter-source breaks */
+int pkgOrderList::OrderCompareB(Package *a, Package *b)
+{
+ PkgIterator A(Cache,a);
+ PkgIterator B(Cache,b);
+
+ if (A.State() != pkgCache::PkgIterator::NeedsNothing &&
+ B.State() == pkgCache::PkgIterator::NeedsNothing)
+ return -1;
+
+ if (A.State() == pkgCache::PkgIterator::NeedsNothing &&
+ B.State() != pkgCache::PkgIterator::NeedsNothing)
+ return 1;
+
+ int F = FileCmp(A,B);
+ if (F != 0)
+ {
+ if (F > 0)
+ return -1;
+ return 1;
+ }
+
+ int ScoreA = Score(A);
+ int ScoreB = Score(B);
+
+ if (ScoreA > ScoreB)
+ return -1;
+
+ if (ScoreA < ScoreB)
+ return 1;
+
+ return strcmp(A.Name(),B.Name());
+}
+ /*}}}*/
+// OrderList::VisitDeps - Visit forward install dependencies /*{{{*/
+// ---------------------------------------------------------------------
+/* This calls the dependency function for the normal forwards dependencies
+ of the package */
+bool pkgOrderList::VisitDeps(DepFunc F,PkgIterator Pkg)
+{
+ if (F == 0 || Pkg.end() == true || Cache[Pkg].InstallVer == 0)
+ return true;
+
+ return (this->*F)(Cache[Pkg].InstVerIter(Cache).DependsList());
+}
+ /*}}}*/
+// OrderList::VisitRDeps - Visit reverse dependencies /*{{{*/
+// ---------------------------------------------------------------------
+/* This calls the dependency function for all of the normal reverse depends
+ of the package */
+bool pkgOrderList::VisitRDeps(DepFunc F,PkgIterator Pkg)
+{
+ if (F == 0 || Pkg.end() == true)
+ return true;
+
+ return (this->*F)(Pkg.RevDependsList());
+}
+ /*}}}*/
+// OrderList::VisitRProvides - Visit provides reverse dependencies /*{{{*/
+// ---------------------------------------------------------------------
+/* This calls the dependency function for all reverse dependencies
+ generated by the provides line on the package. */
+bool pkgOrderList::VisitRProvides(DepFunc F,VerIterator Ver)
+{
+ if (F == 0 || Ver.end() == true)
+ return true;
+
+ bool Res = true;
+ for (PrvIterator P = Ver.ProvidesList(); P.end() == false; ++P)
+ Res &= (this->*F)(P.ParentPkg().RevDependsList());
+ return Res;
+}
+ /*}}}*/
+// OrderList::VisitProvides - Visit all of the providing packages /*{{{*/
+// ---------------------------------------------------------------------
+/* This routine calls visit on all providing packages.
+
+ If the dependency is negative it first visits packages which are
+ intended to be removed and after that all other packages.
+ It does so to avoid situations in which this package is used to
+ satisfy a (or-group/provides) dependency of another package which
+ could have been satisfied also by upgrading another package -
+ otherwise we have more broken packages dpkg needs to auto-
+ deconfigure and in very complicated situations it even decides
+ against it! */
+bool pkgOrderList::VisitProvides(DepIterator D,bool Critical)
+{
+ std::unique_ptr<Version *[]> List(D.AllTargets());
+ for (Version **I = List.get(); *I != 0; ++I)
+ {
+ VerIterator Ver(Cache,*I);
+ PkgIterator Pkg = Ver.ParentPkg();
+
+ if (D.IsNegative() == true && Cache[Pkg].Delete() == false)
+ continue;
+
+ if (Cache[Pkg].Keep() == true && Pkg.State() == PkgIterator::NeedsNothing)
+ continue;
+
+ if (D.IsNegative() == false &&
+ Cache[Pkg].InstallVer != *I)
+ continue;
+
+ if (D.IsNegative() == true &&
+ (Version *)Pkg.CurrentVer() != *I)
+ continue;
+
+ // Skip over missing files
+ if (Critical == false && IsMissing(D.ParentPkg()) == true)
+ continue;
+
+ if (VisitNode(Pkg, "Provides-1") == false)
+ return false;
+ }
+ if (D.IsNegative() == false)
+ return true;
+ for (Version **I = List.get(); *I != 0; ++I)
+ {
+ VerIterator Ver(Cache,*I);
+ PkgIterator Pkg = Ver.ParentPkg();
+
+ if (Cache[Pkg].Delete() == true)
+ continue;
+
+ if (Cache[Pkg].Keep() == true && Pkg.State() == PkgIterator::NeedsNothing)
+ continue;
+
+ if ((Version *)Pkg.CurrentVer() != *I)
+ continue;
+
+ // Skip over missing files
+ if (Critical == false && IsMissing(D.ParentPkg()) == true)
+ continue;
+
+ if (VisitNode(Pkg, "Provides-2") == false)
+ return false;
+ }
+
+ return true;
+}
+ /*}}}*/
+// OrderList::VisitNode - Recursive ordering director /*{{{*/
+// ---------------------------------------------------------------------
+/* This is the core ordering routine. It calls the set dependency
+ consideration functions which then potentially call this again. Finite
+ depth is achieved through the colouring mechinism. */
+bool pkgOrderList::VisitNode(PkgIterator Pkg, char const* from)
+{
+ // Looping or irrelevant.
+ // This should probably trancend not installed packages
+ if (Pkg.end() == true || IsFlag(Pkg,Added) == true ||
+ IsFlag(Pkg,AddPending) == true || IsFlag(Pkg,InList) == false)
+ return true;
+
+ if (Debug == true)
+ {
+ for (int j = 0; j != Depth; j++) clog << ' ';
+ clog << "Visit " << Pkg.FullName() << " from " << from << endl;
+ }
+
+ Depth++;
+
+ // Color grey
+ Flag(Pkg,AddPending);
+
+ DepFunc Old = Primary;
+
+ // Perform immediate configuration of the package if so flagged.
+ if (IsFlag(Pkg,Immediate) == true && Primary != &pkgOrderList::DepUnPackPre)
+ Primary = &pkgOrderList::DepUnPackPreD;
+
+ if (IsNow(Pkg) == true)
+ {
+ bool Res = true;
+ if (Cache[Pkg].Delete() == false)
+ {
+ // Primary
+ Res &= Res && VisitDeps(Primary,Pkg);
+ Res &= Res && VisitRDeps(Primary,Pkg);
+ Res &= Res && VisitRProvides(Primary,Pkg.CurrentVer());
+ Res &= Res && VisitRProvides(Primary,Cache[Pkg].InstVerIter(Cache));
+
+ // RevDep
+ Res &= Res && VisitRDeps(RevDepends,Pkg);
+ Res &= Res && VisitRProvides(RevDepends,Pkg.CurrentVer());
+ Res &= Res && VisitRProvides(RevDepends,Cache[Pkg].InstVerIter(Cache));
+
+ // Secondary
+ Res &= Res && VisitDeps(Secondary,Pkg);
+ Res &= Res && VisitRDeps(Secondary,Pkg);
+ Res &= Res && VisitRProvides(Secondary,Pkg.CurrentVer());
+ Res &= Res && VisitRProvides(Secondary,Cache[Pkg].InstVerIter(Cache));
+ }
+ else
+ {
+ // RevDep
+ Res &= Res && VisitRDeps(Remove,Pkg);
+ Res &= Res && VisitRProvides(Remove,Pkg.CurrentVer());
+ }
+ }
+
+ if (IsFlag(Pkg,Added) == false)
+ {
+ Flag(Pkg,Added,Added | AddPending);
+ if (IsFlag(Pkg,After) == true)
+ *AfterEnd++ = Pkg;
+ else
+ *End++ = Pkg;
+ }
+
+ Primary = Old;
+ Depth--;
+
+ if (Debug == true)
+ {
+ for (int j = 0; j != Depth; j++) clog << ' ';
+ clog << "Leave " << Pkg.FullName() << ' ' << IsFlag(Pkg,Added) << ',' << IsFlag(Pkg,AddPending) << endl;
+ }
+
+ return true;
+}
+ /*}}}*/
+// OrderList::DepUnPackCrit - Critical UnPacking ordering /*{{{*/
+// ---------------------------------------------------------------------
+/* Critical unpacking ordering strives to satisfy Conflicts: and
+ PreDepends: only. When a prdepends is encountered the Primary
+ DepFunc is changed to be DepUnPackPreD.
+
+ Loops are preprocessed and logged. */
+bool pkgOrderList::DepUnPackCrit(DepIterator D)
+{
+ for (; D.end() == false; ++D)
+ {
+ if (D.Reverse() == true)
+ {
+ /* Reverse depenanices are only interested in conflicts,
+ predepend breakage is ignored here */
+ if (D->Type != pkgCache::Dep::Conflicts &&
+ D->Type != pkgCache::Dep::Obsoletes)
+ continue;
+
+ // Duplication elimination, consider only the current version
+ if (D.ParentPkg().CurrentVer() != D.ParentVer())
+ continue;
+
+ /* For reverse dependencies we wish to check if the
+ dependency is satisfied in the install state. The
+ target package (caller) is going to be in the installed
+ state. */
+ if (CheckDep(D) == true)
+ continue;
+
+ if (VisitNode(D.ParentPkg(), "UnPackCrit") == false)
+ return false;
+ }
+ else
+ {
+ /* Forward critical dependencies MUST be correct before the
+ package can be unpacked. */
+ if (D.IsNegative() == false &&
+ D->Type != pkgCache::Dep::PreDepends)
+ continue;
+
+ /* We wish to check if the dep is okay in the now state of the
+ target package against the install state of this package. */
+ if (CheckDep(D) == true)
+ {
+ /* We want to catch predepends loops with the code below.
+ Conflicts loops that are Dep OK are ignored */
+ if (IsFlag(D.TargetPkg(),AddPending) == false ||
+ D->Type != pkgCache::Dep::PreDepends)
+ continue;
+ }
+
+ // This is the loop detection
+ if (IsFlag(D.TargetPkg(),Added) == true ||
+ IsFlag(D.TargetPkg(),AddPending) == true)
+ {
+ if (IsFlag(D.TargetPkg(),AddPending) == true)
+ AddLoop(D);
+ continue;
+ }
+
+ /* Predepends require a special ordering stage, they must have
+ all dependents installed as well */
+ DepFunc Old = Primary;
+ bool Res = false;
+ if (D->Type == pkgCache::Dep::PreDepends)
+ Primary = &pkgOrderList::DepUnPackPreD;
+ Res = VisitProvides(D,true);
+ Primary = Old;
+ if (Res == false)
+ return false;
+ }
+ }
+ return true;
+}
+ /*}}}*/
+// OrderList::DepUnPackPreD - Critical UnPacking ordering with depends /*{{{*/
+// ---------------------------------------------------------------------
+/* Critical PreDepends (also configure immediate and essential) strives to
+ ensure not only that all conflicts+predepends are met but that this
+ package will be immediately configurable when it is unpacked.
+ Loops are preprocessed and logged. */
+bool pkgOrderList::DepUnPackPreD(DepIterator D)
+{
+ if (D.Reverse() == true)
+ return DepUnPackCrit(D);
+
+ for (; D.end() == false; ++D)
+ {
+ if (D.IsCritical() == false)
+ continue;
+
+ /* We wish to check if the dep is okay in the now state of the
+ target package against the install state of this package. */
+ if (CheckDep(D) == true)
+ {
+ /* We want to catch predepends loops with the code below.
+ Conflicts loops that are Dep OK are ignored */
+ if (IsFlag(D.TargetPkg(),AddPending) == false ||
+ D->Type != pkgCache::Dep::PreDepends)
+ continue;
+ }
+
+ // This is the loop detection
+ if (IsFlag(D.TargetPkg(),Added) == true ||
+ IsFlag(D.TargetPkg(),AddPending) == true)
+ {
+ if (IsFlag(D.TargetPkg(),AddPending) == true)
+ AddLoop(D);
+ continue;
+ }
+
+ if (VisitProvides(D,true) == false)
+ return false;
+ }
+ return true;
+}
+ /*}}}*/
+// OrderList::DepUnPackPre - Critical Predepends ordering /*{{{*/
+// ---------------------------------------------------------------------
+/* Critical PreDepends (also configure immediate and essential) strives to
+ ensure not only that all conflicts+predepends are met but that this
+ package will be immediately configurable when it is unpacked.
+
+ Loops are preprocessed and logged. All loops will be fatal. */
+bool pkgOrderList::DepUnPackPre(DepIterator D)
+{
+ if (D.Reverse() == true)
+ return true;
+
+ for (; D.end() == false; ++D)
+ {
+ /* Only consider the PreDepends or Depends. Depends are only
+ considered at the lowest depth or in the case of immediate
+ configure */
+ if (D->Type != pkgCache::Dep::PreDepends)
+ {
+ if (D->Type == pkgCache::Dep::Depends)
+ {
+ if (Depth == 1 && IsFlag(D.ParentPkg(),Immediate) == false)
+ continue;
+ }
+ else
+ continue;
+ }
+
+ /* We wish to check if the dep is okay in the now state of the
+ target package against the install state of this package. */
+ if (CheckDep(D) == true)
+ {
+ /* We want to catch predepends loops with the code below.
+ Conflicts loops that are Dep OK are ignored */
+ if (IsFlag(D.TargetPkg(),AddPending) == false)
+ continue;
+ }
+
+ // This is the loop detection
+ if (IsFlag(D.TargetPkg(),Added) == true ||
+ IsFlag(D.TargetPkg(),AddPending) == true)
+ {
+ if (IsFlag(D.TargetPkg(),AddPending) == true)
+ AddLoop(D);
+ continue;
+ }
+
+ if (VisitProvides(D,true) == false)
+ return false;
+ }
+ return true;
+}
+ /*}}}*/
+// OrderList::DepUnPackDep - Reverse dependency considerations /*{{{*/
+// ---------------------------------------------------------------------
+/* Reverse dependencies are considered to determine if unpacking this
+ package will break any existing dependencies. If so then those
+ packages are ordered before this one so that they are in the
+ UnPacked state.
+
+ The forwards depends loop is designed to bring the packages dependents
+ close to the package. This helps reduce deconfigure time.
+
+ Loops are irrelevant to this. */
+bool pkgOrderList::DepUnPackDep(DepIterator D)
+{
+
+ for (; D.end() == false; ++D)
+ if (D.IsCritical() == true)
+ {
+ if (D.Reverse() == true)
+ {
+ /* Duplication prevention. We consider rev deps only on
+ the current version, a not installed package
+ cannot break */
+ if (D.ParentPkg()->CurrentVer == 0 ||
+ D.ParentPkg().CurrentVer() != D.ParentVer())
+ continue;
+
+ // The dep will not break so it is irrelevant.
+ if (CheckDep(D) == true)
+ continue;
+
+ // Skip over missing files
+ if (IsMissing(D.ParentPkg()) == true)
+ continue;
+
+ if (VisitNode(D.ParentPkg(), "UnPackDep-Parent") == false)
+ return false;
+ }
+ else
+ {
+ if (D->Type == pkgCache::Dep::Depends)
+ if (VisitProvides(D,false) == false)
+ return false;
+
+ if (D->Type == pkgCache::Dep::DpkgBreaks)
+ {
+ if (CheckDep(D) == true)
+ continue;
+
+ if (VisitNode(D.TargetPkg(), "UnPackDep-Target") == false)
+ return false;
+ }
+ }
+ }
+ return true;
+}
+ /*}}}*/
+// OrderList::DepConfigure - Configuration ordering /*{{{*/
+// ---------------------------------------------------------------------
+/* Configuration only ordering orders by the Depends: line only. It
+ orders configuration so that when a package comes to be configured it's
+ dependents are configured.
+
+ Loops are ignored. Depends loop entry points are chaotic. */
+bool pkgOrderList::DepConfigure(DepIterator D)
+{
+ // Never consider reverse configuration dependencies.
+ if (D.Reverse() == true)
+ return true;
+
+ for (; D.end() == false; ++D)
+ if (D->Type == pkgCache::Dep::Depends)
+ if (VisitProvides(D,false) == false)
+ return false;
+ return true;
+}
+ /*}}}*/
+// OrderList::DepRemove - Removal ordering /*{{{*/
+// ---------------------------------------------------------------------
+/* Checks all given dependencies if they are broken by the removal of a
+ package and if so fix it by visiting another provider or or-group
+ member to ensure that the dependee keeps working which is especially
+ important for Immediate packages like e.g. those depending on an
+ awk implementation. If the dependency can't be fixed with another
+ package this means an upgrade of the package will solve the problem. */
+bool pkgOrderList::DepRemove(DepIterator Broken)
+{
+ if (Broken.Reverse() == false)
+ return true;
+
+ for (; Broken.end() == false; ++Broken)
+ {
+ if (Broken->Type != pkgCache::Dep::Depends &&
+ Broken->Type != pkgCache::Dep::PreDepends)
+ continue;
+
+ PkgIterator BrokenPkg = Broken.ParentPkg();
+ // uninstalled packages can't break via a remove
+ if (BrokenPkg->CurrentVer == 0)
+ continue;
+
+ // if its already added, we can't do anything useful
+ if (IsFlag(BrokenPkg, AddPending) == true || IsFlag(BrokenPkg, Added) == true)
+ continue;
+
+ // if the dependee is going to be removed, visit it now
+ if (Cache[BrokenPkg].Delete() == true)
+ return VisitNode(BrokenPkg, "Remove-Dependee");
+
+ // The package stays around, so find out how this is possible
+ for (DepIterator D = BrokenPkg.CurrentVer().DependsList(); D.end() == false;)
+ {
+ // only important or-groups need fixing
+ if (D->Type != pkgCache::Dep::Depends &&
+ D->Type != pkgCache::Dep::PreDepends)
+ {
+ ++D;
+ continue;
+ }
+
+ // Start is the beginning of the or-group, D is the first one after or
+ DepIterator Start = D;
+ bool foundBroken = false;
+ for (bool LastOR = true; D.end() == false && LastOR == true; ++D)
+ {
+ LastOR = (D->CompareOp & pkgCache::Dep::Or) == pkgCache::Dep::Or;
+ if (D == Broken)
+ foundBroken = true;
+ }
+
+ // this or-group isn't the broken one: keep searching
+ if (foundBroken == false)
+ continue;
+
+ // iterate over all members of the or-group searching for a ready replacement
+ bool readyReplacement = false;
+ for (DepIterator OrMember = Start; OrMember != D && readyReplacement == false; ++OrMember)
+ {
+ Version ** Replacements = OrMember.AllTargets();
+ for (Version **R = Replacements; *R != 0; ++R)
+ {
+ VerIterator Ver(Cache,*R);
+ // only currently installed packages can be a replacement
+ PkgIterator RPkg = Ver.ParentPkg();
+ if (RPkg.CurrentVer() != Ver)
+ continue;
+
+ // packages going to be removed can't be a replacement
+ if (Cache[RPkg].Delete() == true)
+ continue;
+
+ readyReplacement = true;
+ break;
+ }
+ delete[] Replacements;
+ }
+
+ // something else is ready to take over, do nothing
+ if (readyReplacement == true)
+ continue;
+
+ // see if we can visit a replacement
+ bool visitReplacement = false;
+ for (DepIterator OrMember = Start; OrMember != D && visitReplacement == false; ++OrMember)
+ {
+ Version ** Replacements = OrMember.AllTargets();
+ for (Version **R = Replacements; *R != 0; ++R)
+ {
+ VerIterator Ver(Cache,*R);
+ // consider only versions we plan to install
+ PkgIterator RPkg = Ver.ParentPkg();
+ if (Cache[RPkg].Install() == false || Cache[RPkg].InstallVer != Ver)
+ continue;
+
+ // loops are not going to help us, so don't create them
+ if (IsFlag(RPkg, AddPending) == true)
+ continue;
+
+ if (IsMissing(RPkg) == true)
+ continue;
+
+ visitReplacement = true;
+ if (IsFlag(BrokenPkg, Immediate) == false)
+ {
+ if (VisitNode(RPkg, "Remove-Rep") == true)
+ break;
+ }
+ else
+ {
+ Flag(RPkg, Immediate);
+ if (VisitNode(RPkg, "Remove-ImmRep") == true)
+ break;
+ }
+ visitReplacement = false;
+ }
+ delete[] Replacements;
+ }
+ if (visitReplacement == true)
+ continue;
+
+ // the broken package in current version can't be fixed, so install new version
+ if (IsMissing(BrokenPkg) == true)
+ break;
+
+ if (VisitNode(BrokenPkg, "Remove-Upgrade") == false)
+ return false;
+ }
+ }
+
+ return true;
+}
+ /*}}}*/
+// OrderList::AddLoop - Add a loop to the loop list /*{{{*/
+// ---------------------------------------------------------------------
+/* We record the loops. This is a relic since loop breaking is done
+ genericaly as part of the safety routines. */
+bool pkgOrderList::AddLoop(DepIterator D)
+{
+ if (LoopCount < 0 || LoopCount >= 20)
+ return false;
+
+ // Skip dups
+ if (LoopCount != 0)
+ {
+ if (Loops[LoopCount - 1].ParentPkg() == D.ParentPkg() ||
+ Loops[LoopCount - 1].TargetPkg() == D.ParentPkg())
+ return true;
+ }
+
+ Loops[LoopCount++] = D;
+
+ // Mark the packages as being part of a loop.
+ //Flag(D.TargetPkg(),Loop);
+ //Flag(D.ParentPkg(),Loop);
+ /* This is currently disabled because the Loop flag is being used for
+ loop management in the package manager. Check the orderlist.h file for more info */
+ return true;
+}
+ /*}}}*/
+// OrderList::WipeFlags - Unset the given flags from all packages /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+void pkgOrderList::WipeFlags(unsigned long F)
+{
+ auto Size = Cache.Head().PackageCount;
+ for (decltype(Size) I = 0; I != Size; ++I)
+ Flags[I] &= ~F;
+}
+ /*}}}*/
+// OrderList::CheckDep - Check a dependency for truth /*{{{*/
+// ---------------------------------------------------------------------
+/* This performs a complete analysis of the dependency wrt to the
+ current add list. It returns true if after all events are
+ performed it is still true. This sort of routine can be approximated
+ by examining the DepCache, however in convoluted cases of provides
+ this fails to produce a suitable result. */
+bool pkgOrderList::CheckDep(DepIterator D)
+{
+ std::unique_ptr<Version *[]> List(D.AllTargets());
+ bool Hit = false;
+ for (Version **I = List.get(); *I != 0; I++)
+ {
+ VerIterator Ver(Cache,*I);
+ PkgIterator Pkg = Ver.ParentPkg();
+
+ /* The meaning of Added and AddPending is subtle. AddPending is
+ an indication that the package is looping. Because of the
+ way ordering works Added means the package will be unpacked
+ before this one and AddPending means after. It is therefore
+ correct to ignore AddPending in all cases, but that exposes
+ reverse-ordering loops which should be ignored. */
+ if (IsFlag(Pkg,Added) == true ||
+ (IsFlag(Pkg,AddPending) == true && D.Reverse() == true))
+ {
+ if (Cache[Pkg].InstallVer != *I)
+ continue;
+ }
+ else
+ if ((Version *)Pkg.CurrentVer() != *I ||
+ Pkg.State() != PkgIterator::NeedsNothing)
+ continue;
+
+ /* Conflicts requires that all versions are not present, depends
+ just needs one */
+ if (D.IsNegative() == false)
+ {
+ // ignore provides by older versions of this package
+ if (((D.Reverse() == false && Pkg == D.ParentPkg()) ||
+ (D.Reverse() == true && Pkg == D.TargetPkg())) &&
+ Cache[Pkg].InstallVer != *I)
+ continue;
+
+ /* Try to find something that does not have the after flag set
+ if at all possible */
+ if (IsFlag(Pkg,After) == true)
+ {
+ Hit = true;
+ continue;
+ }
+
+ return true;
+ }
+ else
+ {
+ if (IsFlag(Pkg,After) == true)
+ Flag(D.ParentPkg(),After);
+
+ return false;
+ }
+ }
+
+ // We found a hit, but it had the after flag set
+ if (Hit == true && D->Type == pkgCache::Dep::PreDepends)
+ {
+ Flag(D.ParentPkg(),After);
+ return true;
+ }
+
+ /* Conflicts requires that all versions are not present, depends
+ just needs one */
+ if (D->Type == pkgCache::Dep::Conflicts ||
+ D->Type == pkgCache::Dep::Obsoletes)
+ return true;
+ return false;
+}
+ /*}}}*/