pkgCache::VerIterator AptCacheFile::findVer(const pkgCache::PkgIterator &pkg)
{
// if the package is installed return the current version
if (!pkg.CurrentVer().end()) {
return pkg.CurrentVer();
}
// Else get the candidate version iterator
const pkgCache::VerIterator &candidateVer = findCandidateVer(pkg);
if (!candidateVer.end()) {
return candidateVer;
}
// return the version list as a last resource
return pkg.VersionList();
}
static void fancy_reverse_deps(const pkgCache::PkgIterator pkg, const pkgCache::VerIterator ver, callback_t callback) {
for (pkgCache::DepIterator dep = pkg.RevDependsList(); !dep.end(); ++dep) {
if (dep.IsSatisfied(ver)) callback(dep);
}
for (pkgCache::PrvIterator prv = ver.ProvidesList(); !prv.end(); ++prv) {
for (pkgCache::DepIterator dep = prv.ParentPkg().RevDependsList(); !dep.end(); ++dep) {
if (dep.IsSatisfied(prv)) callback(dep);
}
}
}
bool notable_remove(pkgCacheFile &Cache, const std::vector<scan_info> &info, const pkgCache::PkgIterator pkg) {
// removing as requested
if (info[pkg->ID].in_no) return true;
bool notable = true;
fancy_reverse_deps(pkg, pkg.CurrentVer(), [&](const pkgCache::DepIterator dep) {
if (dep.IsNegative()) return;
if (!Cache->IsImportantDep(dep)) return;
if (!Cache[dep.ParentPkg()].Delete()) return;
if (dep.ParentVer() != dep.ParentPkg().CurrentVer()) return;
// something else being removed depends on it
notable = false;
});
return notable;
}