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apt/apt-pkg/orderlist.cc
Daniel Baumann 6810ba718b
Adding upstream version 3.0.2. 
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
2025-06-20 21:10:43 +02:00

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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 progressively 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 <cstdlib>
#include <cstring>
#include <iostream>
/*}}}*/
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 mechanism. */
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;
}
/*}}}*/
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