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// infer_reason.cc
//
// Copyright 2004 Daniel Burrows
#include "infer_reason.h"
#include "apt.h"
#include "config_signal.h"
#include "rev_dep_iterator.h"
#include <apt-pkg/pkgsystem.h>
#include <apt-pkg/version.h>
#include <set>
using namespace std;
bool operator<(const reason &a, const reason &b)
{
// This function uses the *reverse* order of get_deptype_order.
const int i = get_deptype_order((pkgCache::Dep::DepType) a.dep->Type);
const int j = get_deptype_order((pkgCache::Dep::DepType) b.dep->Type);
if(i > j)
return true;
else if(j > i)
return false;
else
return strcmp(a.pkg.Name(), b.pkg.Name()) < 0;
}
static bool relevant_dep(pkgCache::VerIterator ver, pkgCache::DepIterator d)
{
// Check whether the package doing the depending is going
// to be installed.
pkgCache::PkgIterator depender=d.ParentPkg();
pkgDepCache::StateCache &depstate=(*apt_cache_file)[depender];
pkgCache::VerIterator depinstver=depstate.InstVerIter(*apt_cache_file);
if(!depinstver.end() &&
_system->VS->CheckDep(ver.VerStr(),
d->CompareOp, d.TargetVer()))
{
if(d.ParentVer()==depinstver)
return true;
}
return false;
}
/** Returns \b true if the given dependency is an indirect
* self-conflict on a pure virtual package that is not provided by
* any other package which is to be installed. (the last condition is
* because packages which will not be installed are uninteresting for
* a Conflicts/Breaks)
*
* \param dep the dependency to test.
*/
static bool is_simple_self_conflict(pkgCache::DepIterator dep) {
pkgCache::PkgIterator target=dep.TargetPkg();
pkgDepCache::StateCache depstate=(*apt_cache_file)[target];
if(!((target.CurrentVer().end() && depstate.Keep()) ||
depstate.Delete()))
return false;
if(dep.TargetPkg().ProvidesList().end())
return false;
else
for(pkgCache::PrvIterator P=dep.TargetPkg().ProvidesList();
!P.end(); ++P)
{
// Ignore provides that don't impact the dep.
if(!_system->VS->CheckDep(P.ProvideVersion(),
dep->CompareOp, dep.TargetVer()))
continue;
pkgCache::PkgIterator pkg=P.OwnerPkg();
pkgDepCache::StateCache state=(*apt_cache_file)[pkg];
if(P.OwnerPkg()!=dep.ParentPkg() &&
!((pkg.CurrentVer().end() && state.Keep()) ||
state.Delete()))
return false;
}
return true;
}
void infer_reason(pkgCache::PkgIterator pkg, set<reason> &reasons)
{
pkg_action_state actionstate=find_pkg_state(pkg, *apt_cache_file);
pkgDepCache::StateCache &state=(*apt_cache_file)[pkg];
pkgCache::VerIterator instver=state.InstVerIter(*apt_cache_file);
pkgCache::VerIterator candver=state.CandidateVerIter(*apt_cache_file);
if(actionstate==pkg_auto_install)
{
for(rev_dep_iterator d(instver); !d.end(); ++d)
if(!is_conflict((*d)->Type) &&
relevant_dep(instver, *d))
reasons.insert(reason((*d).ParentPkg(), *d));
}
else if(actionstate==pkg_unchanged && pkg.CurrentVer().end())
// Add notes about packages that Recommend or Suggest this.
{
for(rev_dep_iterator d(pkg); !d.end(); ++d)
if((*d)->Type==pkgCache::Dep::Suggests ||
(*d)->Type==pkgCache::Dep::Recommends)
if(!candver.end() && relevant_dep(candver, *d))
reasons.insert(reason((*d).ParentPkg(), *d));
}
// Non-unused removed packages: was one of their dependents
// removed? Maybe a conflicting package.
//
// FIXME: version numbers?
else if(actionstate==pkg_auto_remove)
{
// Look for *other* packages that conflict with this one.
for(rev_dep_iterator d(pkg.CurrentVer()); !d.end(); ++d)
if(is_conflict((*d)->Type) &&
relevant_dep(pkg.CurrentVer(), *d) &&
!is_simple_self_conflict(*d))
reasons.insert(reason((*d).ParentPkg(), *d));
for(pkgCache::DepIterator d=pkg.CurrentVer().DependsList(); !d.end(); ++d)
{
// FIXME: O(n^2) -- store the whole or list and iterate
// over it at the end.
pkgCache::DepIterator or_end=d;
while(or_end->CompareOp & pkgCache::Dep::Or)
++or_end;
if((or_end.IsCritical() ||
or_end->Type==pkgCache::Dep::Recommends ||
or_end->Type==pkgCache::Dep::Suggests) &&
((*apt_cache_file)[or_end]&pkgDepCache::DepGNow) &&
!((*apt_cache_file)[or_end]&pkgDepCache::DepGInstall))
reasons.insert(reason(d.TargetPkg(), d));
}
}
else if(actionstate==pkg_unused_remove)
{
// Who used to depend on this package and is now being removed?
//
// FIXME: should I walk backwards up the dependency chain until
// finding something manually installed?
for(pkgCache::DepIterator d=pkg.RevDependsList(); !d.end(); ++d)
if(d.ParentVer()==d.ParentPkg().CurrentVer() &&
((*apt_cache_file)[d.ParentPkg()].Delete() ||
(*apt_cache_file)[d.ParentPkg()].InstVerIter(*apt_cache_file)!=d.ParentVer()) &&
(d->Type==pkgCache::Dep::Depends ||
(aptcfg->FindB("Apt::Install-Recommends", true) &&
d->Type==pkgCache::Dep::Recommends)))
reasons.insert(reason(d.ParentPkg(), d));
}
else if(actionstate==pkg_auto_hold)
{
// hm, I doubt this is sufficient, but test cases are hard to
// come by :(
for(pkgCache::DepIterator d=instver.DependsList();
!d.end(); ++d)
// if(d.IsCritical())
{
pkgCache::DepIterator or_end=d;
while(or_end->CompareOp & pkgCache::Dep::Or)
++or_end;
if(!((*apt_cache_file)[or_end]&pkgDepCache::DepGInstall))
reasons.insert(reason(d.TargetPkg(), d));
}
}
else if(actionstate==pkg_broken)
{
if(state.InstBroken())
for(pkgCache::DepIterator d=state.InstVerIter(*apt_cache_file).DependsList();
!d.end(); ++d)
if(d.IsCritical())
{
pkgCache::DepIterator or_end=d;
while(or_end->CompareOp & pkgCache::Dep::Or)
++or_end;
if(!((*apt_cache_file)[or_end]&pkgDepCache::DepGInstall))
reasons.insert(reason(d.TargetPkg(), d));
}
}
}
/** Infer reverse breakage information based on the given dependency. */
void infer_reverse_breakage(pkgCache::PkgIterator &pkg,
pkgCache::DepIterator &dep,
set<reason> &reasons)
{
// Only look at dependencies whose source is installed.
pkgCache::VerIterator parentinstver=(*apt_cache_file)[dep.ParentPkg()].InstVerIter(*apt_cache_file);
if(parentinstver.end() || parentinstver!=dep.ParentVer())
return;
if(dep->Type==pkgCache::Dep::Depends || dep->Type==pkgCache::Dep::PreDepends)
{
// Find a forward dependency and move to the last element
// of the OR group.
pkgCache::DepIterator f(*apt_cache_file, &*dep);
while(f->CompareOp & pkgCache::Dep::Or)
++f;
// If the dependency is broken, then this package is a
// potential resolver (by definition)
if(!((*apt_cache_file)[f]&pkgDepCache::DepGInstall))
reasons.insert(reason(dep.ParentPkg(), dep));
}
// Look at any conflict that's not an immediate self-conflict
else if(is_conflict(dep->Type) &&
(dep.TargetPkg()!=pkg || dep.ParentPkg()!=pkg))
{
pkgCache::VerIterator instver=(*apt_cache_file)[pkg].InstVerIter(*apt_cache_file);
if(!instver.end() &&
_system->VS->CheckDep(instver.VerStr(),
dep->CompareOp,
dep.TargetVer()))
{
// exclude self-conflicts through reverse provides.
if(dep.ParentPkg()==pkg && !dep.TargetVer() && is_simple_self_conflict(dep))
return;
reasons.insert(reason(dep.ParentPkg(), dep));
}
}
}
void infer_reverse_breakage(pkgCache::PkgIterator pkg,
set<reason> &reasons)
{
for(pkgCache::DepIterator D=pkg.RevDependsList(); !D.end(); ++D)
infer_reverse_breakage(pkg, D, reasons);
set<pkgCache::PkgIterator, pkg_ptr_lt> seen;
// Look at the list of stuff provided by any version.
for(pkgCache::VerIterator V=pkg.VersionList(); !V.end(); ++V)
for(pkgCache::PrvIterator P=V.ProvidesList(); !P.end(); ++P)
{
pkgCache::PkgIterator prv_pkg=P.ParentPkg();
if(seen.find(prv_pkg)==seen.end())
{
seen.insert(prv_pkg);
for(pkgCache::DepIterator D=prv_pkg.RevDependsList(); !D.end(); ++D)
{
if(_system->VS->CheckDep(P.ProvideVersion(),
D->CompareOp,
D.TargetVer()))
infer_reverse_breakage(prv_pkg, D, reasons);
}
}
}
}
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