X-Git-Url: https://git.saurik.com/apt.git/blobdiff_plain/1aa9b2974d33015102224ffb738b2e8e0a4bcb42..4e9ccfb2ff599b7a65ecec3c2f1383636f068f0c:/apt-pkg/cacheset.cc

diff --git a/apt-pkg/cacheset.cc b/apt-pkg/cacheset.cc
index 43ade4b4e..a1de613e2 100644
--- a/apt-pkg/cacheset.cc
+++ b/apt-pkg/cacheset.cc
@@ -10,8 +10,9 @@
 									/*}}}*/
 // Include Files							/*{{{*/
 #include <apt-pkg/aptconfiguration.h>
-#include <apt-pkg/error.h>
+#include <apt-pkg/cachefilter.h>
 #include <apt-pkg/cacheset.h>
+#include <apt-pkg/error.h>
 #include <apt-pkg/strutl.h>
 #include <apt-pkg/versionmatch.h>
 
@@ -22,16 +23,72 @@
 #include <regex.h>
 									/*}}}*/
 namespace APT {
-// FromRegEx - Return all packages in the cache matching a pattern	/*{{{*/
-PackageSet PackageSet::FromRegEx(pkgCacheFile &Cache, std::string pattern, std::ostream &out) {
-	PackageSet pkgset;
+// FromTask - Return all packages in the cache from a specific task	/*{{{*/
+PackageSet PackageSet::FromTask(pkgCacheFile &Cache, std::string pattern, CacheSetHelper &helper) {
+	size_t const archfound = pattern.find_last_of(':');
 	std::string arch = "native";
-	static const char * const isregex = ".?+*|[^$";
+	if (archfound != std::string::npos) {
+		arch = pattern.substr(archfound+1);
+		pattern.erase(archfound);
+	}
 
-	if (pattern.find_first_of(isregex) == std::string::npos)
+	if (pattern[pattern.length() -1] != '^')
+		return APT::PackageSet(TASK);
+	pattern.erase(pattern.length()-1);
+
+	if (unlikely(Cache.GetPkgCache() == 0 || Cache.GetDepCache() == 0))
+		return APT::PackageSet(TASK);
+
+	PackageSet pkgset(TASK);
+	// get the records
+	pkgRecords Recs(Cache);
+
+	// build regexp for the task
+	regex_t Pattern;
+	char S[300];
+	snprintf(S, sizeof(S), "^Task:.*[, ]%s([, ]|$)", pattern.c_str());
+	if(regcomp(&Pattern,S, REG_EXTENDED | REG_NOSUB | REG_NEWLINE) != 0) {
+		_error->Error("Failed to compile task regexp");
 		return pkgset;
+	}
+
+	for (pkgCache::GrpIterator Grp = Cache->GrpBegin(); Grp.end() == false; ++Grp) {
+		pkgCache::PkgIterator Pkg = Grp.FindPkg(arch);
+		if (Pkg.end() == true)
+			continue;
+		pkgCache::VerIterator ver = Cache[Pkg].CandidateVerIter(Cache);
+		if(ver.end() == true)
+			continue;
+
+		pkgRecords::Parser &parser = Recs.Lookup(ver.FileList());
+		const char *start, *end;
+		parser.GetRec(start,end);
+		unsigned int const length = end - start;
+		char buf[length];
+		strncpy(buf, start, length);
+		buf[length-1] = '\0';
+		if (regexec(&Pattern, buf, 0, 0, 0) != 0)
+			continue;
+
+		pkgset.insert(Pkg);
+	}
+	regfree(&Pattern);
+
+	if (pkgset.empty() == true)
+		return helper.canNotFindTask(Cache, pattern);
+
+	helper.showTaskSelection(pkgset, pattern);
+	return pkgset;
+}
+									/*}}}*/
+// FromRegEx - Return all packages in the cache matching a pattern	/*{{{*/
+PackageSet PackageSet::FromRegEx(pkgCacheFile &Cache, std::string pattern, CacheSetHelper &helper) {
+	static const char * const isregex = ".?+*|[^$";
+	if (pattern.find_first_of(isregex) == std::string::npos)
+		return PackageSet(REGEX);
 
 	size_t archfound = pattern.find_last_of(':');
+	std::string arch = "native";
 	if (archfound != std::string::npos) {
 		arch = pattern.substr(archfound+1);
 		if (arch.find_first_of(isregex) == std::string::npos)
@@ -40,18 +97,14 @@ PackageSet PackageSet::FromRegEx(pkgCacheFile &Cache, std::string pattern, std::
 			arch = "native";
 	}
 
-	regex_t Pattern;
-	int Res;
-	if ((Res = regcomp(&Pattern, pattern.c_str() , REG_EXTENDED | REG_ICASE | REG_NOSUB)) != 0) {
-		char Error[300];
-		regerror(Res, &Pattern, Error, sizeof(Error));
-		_error->Error(_("Regex compilation error - %s"), Error);
-		return pkgset;
-	}
+	if (unlikely(Cache.GetPkgCache() == 0))
+		return PackageSet(REGEX);
 
-	for (pkgCache::GrpIterator Grp = Cache.GetPkgCache()->GrpBegin(); Grp.end() == false; ++Grp)
-	{
-		if (regexec(&Pattern, Grp.Name(), 0, 0, 0) != 0)
+	APT::CacheFilter::PackageNameMatchesRegEx regexfilter(pattern);
+
+	PackageSet pkgset(REGEX);
+	for (pkgCache::GrpIterator Grp = Cache.GetPkgCache()->GrpBegin(); Grp.end() == false; ++Grp) {
+		if (regexfilter(Grp) == false)
 			continue;
 		pkgCache::PkgIterator Pkg = Grp.FindPkg(arch);
 		if (Pkg.end() == true) {
@@ -65,33 +118,60 @@ PackageSet PackageSet::FromRegEx(pkgCacheFile &Cache, std::string pattern, std::
 				continue;
 		}
 
-		ioprintf(out, _("Note, selecting %s for regex '%s'\n"),
-			 Pkg.FullName(true).c_str(), pattern.c_str());
-
 		pkgset.insert(Pkg);
 	}
 
-	regfree(&Pattern);
+	if (pkgset.empty() == true)
+		return helper.canNotFindRegEx(Cache, pattern);
 
+	helper.showRegExSelection(pkgset, pattern);
 	return pkgset;
 }
 									/*}}}*/
+// FromName - Returns the package defined  by this string		/*{{{*/
+pkgCache::PkgIterator PackageSet::FromName(pkgCacheFile &Cache,
+			std::string const &str, CacheSetHelper &helper) {
+	std::string pkg = str;
+	size_t archfound = pkg.find_last_of(':');
+	std::string arch;
+	if (archfound != std::string::npos) {
+		arch = pkg.substr(archfound+1);
+		pkg.erase(archfound);
+	}
+
+	if (Cache.GetPkgCache() == 0)
+		return pkgCache::PkgIterator(Cache, 0);
+
+	pkgCache::PkgIterator Pkg(Cache, 0);
+	if (arch.empty() == true) {
+		pkgCache::GrpIterator Grp = Cache.GetPkgCache()->FindGrp(pkg);
+		if (Grp.end() == false)
+			Pkg = Grp.FindPreferredPkg();
+	} else
+		Pkg = Cache.GetPkgCache()->FindPkg(pkg, arch);
+
+	if (Pkg.end() == true)
+		return helper.canNotFindPkgName(Cache, str);
+	return Pkg;
+}
+									/*}}}*/
 // GroupedFromCommandLine - Return all versions specified on commandline/*{{{*/
 std::map<unsigned short, PackageSet> PackageSet::GroupedFromCommandLine(
 		pkgCacheFile &Cache, const char **cmdline,
 		std::list<PackageSet::Modifier> const &mods,
-		unsigned short const &fallback, std::ostream &out) {
+		unsigned short const &fallback, CacheSetHelper &helper) {
 	std::map<unsigned short, PackageSet> pkgsets;
 	for (const char **I = cmdline; *I != 0; ++I) {
 		unsigned short modID = fallback;
 		std::string str = *I;
+		bool modifierPresent = false;
 		for (std::list<PackageSet::Modifier>::const_iterator mod = mods.begin();
 		     mod != mods.end(); ++mod) {
 			size_t const alength = strlen(mod->Alias);
 			switch(mod->Pos) {
 			case PackageSet::Modifier::POSTFIX:
 				if (str.compare(str.length() - alength, alength,
-				    mod->Alias, 0, alength) != 0)
+						mod->Alias, 0, alength) != 0)
 					continue;
 				str.erase(str.length() - alength);
 				modID = mod->ID;
@@ -101,180 +181,331 @@ std::map<unsigned short, PackageSet> PackageSet::GroupedFromCommandLine(
 			case PackageSet::Modifier::NONE:
 				continue;
 			}
+			modifierPresent = true;
 			break;
 		}
-		PackageSet pset = PackageSet::FromString(Cache, str, out);
-		pkgsets[modID].insert(pset.begin(), pset.end());
+		if (modifierPresent == true) {
+			bool const errors = helper.showErrors(false);
+			pkgCache::PkgIterator Pkg = FromName(Cache, *I, helper);
+			helper.showErrors(errors);
+			if (Pkg.end() == false) {
+				pkgsets[fallback].insert(Pkg);
+				continue;
+			}
+		}
+		pkgsets[modID].insert(PackageSet::FromString(Cache, str, helper));
 	}
 	return pkgsets;
 }
 									/*}}}*/
 // FromCommandLine - Return all packages specified on commandline	/*{{{*/
-PackageSet PackageSet::FromCommandLine(pkgCacheFile &Cache, const char **cmdline, std::ostream &out) {
+PackageSet PackageSet::FromCommandLine(pkgCacheFile &Cache, const char **cmdline, CacheSetHelper &helper) {
 	PackageSet pkgset;
 	for (const char **I = cmdline; *I != 0; ++I) {
-		PackageSet pset = FromString(Cache, *I, out);
+		PackageSet pset = FromString(Cache, *I, helper);
 		pkgset.insert(pset.begin(), pset.end());
 	}
 	return pkgset;
 }
 									/*}}}*/
 // FromString - Return all packages matching a specific string		/*{{{*/
-PackageSet PackageSet::FromString(pkgCacheFile &Cache, std::string const &str, std::ostream &out) {
-	std::string pkg = str;
-	size_t archfound = pkg.find_last_of(':');
-	std::string arch;
-	if (archfound != std::string::npos) {
-		arch = pkg.substr(archfound+1);
-		pkg.erase(archfound);
+PackageSet PackageSet::FromString(pkgCacheFile &Cache, std::string const &str, CacheSetHelper &helper) {
+	_error->PushToStack();
+
+	PackageSet pkgset;
+	pkgCache::PkgIterator Pkg = FromName(Cache, str, helper);
+	if (Pkg.end() == false)
+		pkgset.insert(Pkg);
+	else {
+		pkgset = FromTask(Cache, str, helper);
+		if (pkgset.empty() == true) {
+			pkgset = FromRegEx(Cache, str, helper);
+			if (pkgset.empty() == true)
+				pkgset = helper.canNotFindPackage(Cache, str);
+		}
 	}
 
-	pkgCache::PkgIterator Pkg;
-	if (arch.empty() == true) {
-		pkgCache::GrpIterator Grp = Cache.GetPkgCache()->FindGrp(pkg);
-		if (Grp.end() == false)
-			Pkg = Grp.FindPreferredPkg();
-	} else
-		Pkg = Cache.GetPkgCache()->FindPkg(pkg, arch);
+	if (pkgset.empty() == false)
+		_error->RevertToStack();
+	else
+		_error->MergeWithStack();
+	return pkgset;
+}
+									/*}}}*/
+// GroupedFromCommandLine - Return all versions specified on commandline/*{{{*/
+std::map<unsigned short, VersionSet> VersionSet::GroupedFromCommandLine(
+		pkgCacheFile &Cache, const char **cmdline,
+		std::list<VersionSet::Modifier> const &mods,
+		unsigned short const &fallback, CacheSetHelper &helper) {
+	std::map<unsigned short, VersionSet> versets;
+	for (const char **I = cmdline; *I != 0; ++I) {
+		unsigned short modID = fallback;
+		VersionSet::Version select = VersionSet::NEWEST;
+		std::string str = *I;
+		bool modifierPresent = false;
+		for (std::list<VersionSet::Modifier>::const_iterator mod = mods.begin();
+		     mod != mods.end(); ++mod) {
+			if (modID == fallback && mod->ID == fallback)
+				select = mod->SelectVersion;
+			size_t const alength = strlen(mod->Alias);
+			switch(mod->Pos) {
+			case VersionSet::Modifier::POSTFIX:
+				if (str.compare(str.length() - alength, alength,
+						mod->Alias, 0, alength) != 0)
+					continue;
+				str.erase(str.length() - alength);
+				modID = mod->ID;
+				select = mod->SelectVersion;
+				break;
+			case VersionSet::Modifier::PREFIX:
+				continue;
+			case VersionSet::Modifier::NONE:
+				continue;
+			}
+			modifierPresent = true;
+			break;
+		}
 
-	if (Pkg.end() == false) {
-		PackageSet pkgset;
-		pkgset.insert(Pkg);
-		return pkgset;
+		if (modifierPresent == true) {
+			bool const errors = helper.showErrors(false);
+			VersionSet const vset = VersionSet::FromString(Cache, std::string(*I), select, helper, true);
+			helper.showErrors(errors);
+			if (vset.empty() == false) {
+				versets[fallback].insert(vset);
+				continue;
+			}
+		}
+		versets[modID].insert(VersionSet::FromString(Cache, str, select , helper));
 	}
-	PackageSet regex = FromRegEx(Cache, str, out);
-	if (regex.empty() == true)
-		_error->Warning(_("Unable to locate package %s"), str.c_str());
-	return regex;
+	return versets;
 }
 									/*}}}*/
 // FromCommandLine - Return all versions specified on commandline	/*{{{*/
 APT::VersionSet VersionSet::FromCommandLine(pkgCacheFile &Cache, const char **cmdline,
-		APT::VersionSet::Version const &fallback, std::ostream &out) {
+		APT::VersionSet::Version const &fallback, CacheSetHelper &helper) {
 	VersionSet verset;
-	for (const char **I = cmdline; *I != 0; ++I) {
-		std::string pkg = *I;
-		std::string ver;
-		bool verIsRel = false;
-		size_t const vertag = pkg.find_last_of("/=");
-		if (vertag != string::npos) {
-			ver = pkg.substr(vertag+1);
-			verIsRel = (pkg[vertag] == '/');
-			pkg.erase(vertag);
+	for (const char **I = cmdline; *I != 0; ++I)
+		verset.insert(VersionSet::FromString(Cache, *I, fallback, helper));
+	return verset;
+}
+									/*}}}*/
+// FromString - Returns all versions spedcified by a string		/*{{{*/
+APT::VersionSet VersionSet::FromString(pkgCacheFile &Cache, std::string pkg,
+		APT::VersionSet::Version const &fallback, CacheSetHelper &helper,
+		bool const &onlyFromName) {
+	std::string ver;
+	bool verIsRel = false;
+	size_t const vertag = pkg.find_last_of("/=");
+	if (vertag != string::npos) {
+		ver = pkg.substr(vertag+1);
+		verIsRel = (pkg[vertag] == '/');
+		pkg.erase(vertag);
+	}
+	PackageSet pkgset;
+	if (onlyFromName == false)
+		pkgset = PackageSet::FromString(Cache, pkg, helper);
+	else {
+		pkgset.insert(PackageSet::FromName(Cache, pkg, helper));
+	}
+
+	VersionSet verset;
+	bool errors = true;
+	if (pkgset.getConstructor() != PackageSet::UNKNOWN)
+		errors = helper.showErrors(false);
+	for (PackageSet::const_iterator P = pkgset.begin();
+	     P != pkgset.end(); ++P) {
+		if (vertag == string::npos) {
+			verset.insert(VersionSet::FromPackage(Cache, P, fallback, helper));
+			continue;
 		}
-		PackageSet pkgset = PackageSet::FromString(Cache, pkg.c_str(), out);
-		for (PackageSet::const_iterator P = pkgset.begin();
-		     P != pkgset.end(); ++P) {
-			if (vertag == string::npos) {
-				AddSelectedVersion(Cache, verset, P, fallback);
+		pkgCache::VerIterator V;
+		if (ver == "installed")
+			V = getInstalledVer(Cache, P, helper);
+		else if (ver == "candidate")
+			V = getCandidateVer(Cache, P, helper);
+		else if (ver == "newest") {
+			if (P->VersionList != 0)
+				V = P.VersionList();
+			else
+				V = helper.canNotFindNewestVer(Cache, P);
+		} else {
+			pkgVersionMatch Match(ver, (verIsRel == true ? pkgVersionMatch::Release :
+					pkgVersionMatch::Version));
+			V = Match.Find(P);
+			if (V.end() == true) {
+				if (verIsRel == true)
+					_error->Error(_("Release '%s' for '%s' was not found"),
+							ver.c_str(), P.FullName(true).c_str());
+				else
+					_error->Error(_("Version '%s' for '%s' was not found"),
+							ver.c_str(), P.FullName(true).c_str());
 				continue;
 			}
-			pkgCache::VerIterator V;
-			if (ver == "installed")
-				V = getInstalledVer(Cache, P);
-			else if (ver == "candidate")
-				V = getCandidateVer(Cache, P);
-			else {
-				pkgVersionMatch Match(ver, (verIsRel == true ? pkgVersionMatch::Release :
-						pkgVersionMatch::Version));
-				V = Match.Find(P);
-				if (V.end() == true) {
-					if (verIsRel == true)
-						_error->Error(_("Release '%s' for '%s' was not found"),
-								ver.c_str(), P.FullName(true).c_str());
-					else
-						_error->Error(_("Version '%s' for '%s' was not found"),
-								ver.c_str(), P.FullName(true).c_str());
-					continue;
-				}
-			}
-			if (V.end() == true)
-				continue;
-			if (ver == V.VerStr())
-				ioprintf(out, _("Selected version '%s' (%s) for '%s'\n"),
-					 V.VerStr(), V.RelStr().c_str(), P.FullName(true).c_str());
-			verset.insert(V);
 		}
+		if (V.end() == true)
+			continue;
+		helper.showSelectedVersion(P, V, ver, verIsRel);
+		verset.insert(V);
 	}
+	if (pkgset.getConstructor() != PackageSet::UNKNOWN)
+		helper.showErrors(errors);
 	return verset;
 }
 									/*}}}*/
-// AddSelectedVersion - add version from package based on fallback	/*{{{*/
-bool VersionSet::AddSelectedVersion(pkgCacheFile &Cache, VersionSet &verset,
-		pkgCache::PkgIterator const &P, VersionSet::Version const &fallback,
-		bool const &AllowError) {
+// FromPackage - versions from package based on fallback		/*{{{*/
+VersionSet VersionSet::FromPackage(pkgCacheFile &Cache, pkgCache::PkgIterator const &P,
+		VersionSet::Version const &fallback, CacheSetHelper &helper) {
+	VersionSet verset;
 	pkgCache::VerIterator V;
+	bool showErrors;
 	switch(fallback) {
 	case VersionSet::ALL:
 		if (P->VersionList != 0)
 			for (V = P.VersionList(); V.end() != true; ++V)
 				verset.insert(V);
-		else if (AllowError == false)
-			return _error->Error(_("Can't select versions from package '%s' as it purely virtual"), P.FullName(true).c_str());
 		else
-			return false;
+			verset.insert(helper.canNotFindAllVer(Cache, P));
 		break;
 	case VersionSet::CANDANDINST:
-		verset.insert(getInstalledVer(Cache, P, AllowError));
-		verset.insert(getCandidateVer(Cache, P, AllowError));
+		verset.insert(getInstalledVer(Cache, P, helper));
+		verset.insert(getCandidateVer(Cache, P, helper));
 		break;
 	case VersionSet::CANDIDATE:
-		verset.insert(getCandidateVer(Cache, P, AllowError));
+		verset.insert(getCandidateVer(Cache, P, helper));
 		break;
 	case VersionSet::INSTALLED:
-		verset.insert(getInstalledVer(Cache, P, AllowError));
+		verset.insert(getInstalledVer(Cache, P, helper));
 		break;
 	case VersionSet::CANDINST:
-		V = getCandidateVer(Cache, P, true);
+		showErrors = helper.showErrors(false);
+		V = getCandidateVer(Cache, P, helper);
 		if (V.end() == true)
-			V = getInstalledVer(Cache, P, true);
+			V = getInstalledVer(Cache, P, helper);
+		helper.showErrors(showErrors);
 		if (V.end() == false)
 			verset.insert(V);
-		else if (AllowError == false)
-			return _error->Error(_("Can't select installed nor candidate version from package '%s' as it has neither of them"), P.FullName(true).c_str());
 		else
-			return false;
+			verset.insert(helper.canNotFindInstCandVer(Cache, P));
 		break;
 	case VersionSet::INSTCAND:
-		V = getInstalledVer(Cache, P, true);
+		showErrors = helper.showErrors(false);
+		V = getInstalledVer(Cache, P, helper);
 		if (V.end() == true)
-			V = getCandidateVer(Cache, P, true);
+			V = getCandidateVer(Cache, P, helper);
+		helper.showErrors(showErrors);
 		if (V.end() == false)
 			verset.insert(V);
-		else if (AllowError == false)
-			return _error->Error(_("Can't select installed nor candidate version from package '%s' as it has neither of them"), P.FullName(true).c_str());
 		else
-			return false;
+			verset.insert(helper.canNotFindInstCandVer(Cache, P));
 		break;
 	case VersionSet::NEWEST:
 		if (P->VersionList != 0)
 			verset.insert(P.VersionList());
-		else if (AllowError == false)
-			return _error->Error(_("Can't select newest version from package '%s' as it is purely virtual"), P.FullName(true).c_str());
 		else
-			return false;
+			verset.insert(helper.canNotFindNewestVer(Cache, P));
 		break;
 	}
-	return true;
+	return verset;
 }
 									/*}}}*/
 // getCandidateVer - Returns the candidate version of the given package	/*{{{*/
 pkgCache::VerIterator VersionSet::getCandidateVer(pkgCacheFile &Cache,
-		pkgCache::PkgIterator const &Pkg, bool const &AllowError) {
-	if (unlikely(Cache.BuildDepCache() == false))
-		return pkgCache::VerIterator(*Cache);
-	pkgCache::VerIterator Cand = Cache[Pkg].CandidateVerIter(Cache);
-	if (AllowError == false && Cand.end() == true)
-		_error->Error(_("Can't select candidate version from package %s as it has no candidate"), Pkg.FullName(true).c_str());
+		pkgCache::PkgIterator const &Pkg, CacheSetHelper &helper) {
+	pkgCache::VerIterator Cand;
+	if (Cache.IsPolicyBuilt() == true || Cache.IsDepCacheBuilt() == false)
+	{
+		if (unlikely(Cache.GetPolicy() == 0))
+			return pkgCache::VerIterator(Cache);
+		Cand = Cache.GetPolicy()->GetCandidateVer(Pkg);
+	} else {
+		Cand = Cache[Pkg].CandidateVerIter(Cache);
+	}
+	if (Cand.end() == true)
+		return helper.canNotFindCandidateVer(Cache, Pkg);
 	return Cand;
 }
 									/*}}}*/
 // getInstalledVer - Returns the installed version of the given package	/*{{{*/
 pkgCache::VerIterator VersionSet::getInstalledVer(pkgCacheFile &Cache,
-		pkgCache::PkgIterator const &Pkg, bool const &AllowError) {
-	if (AllowError == false && Pkg->CurrentVer == 0)
-		_error->Error(_("Can't select installed version from package %s as it is not installed"), Pkg.FullName(true).c_str());
+		pkgCache::PkgIterator const &Pkg, CacheSetHelper &helper) {
+	if (Pkg->CurrentVer == 0)
+		return helper.canNotFindInstalledVer(Cache, Pkg);
 	return Pkg.CurrentVer();
 }
 									/*}}}*/
+// canNotFindPkgName - handle the case no package has this name		/*{{{*/
+pkgCache::PkgIterator CacheSetHelper::canNotFindPkgName(pkgCacheFile &Cache,
+			std::string const &str) {
+	if (ShowError == true)
+		_error->Insert(ErrorType, _("Unable to locate package %s"), str.c_str());
+	return pkgCache::PkgIterator(Cache, 0);
+}
+									/*}}}*/
+// canNotFindTask - handle the case no package is found for a task	/*{{{*/
+PackageSet CacheSetHelper::canNotFindTask(pkgCacheFile &Cache, std::string pattern) {
+	if (ShowError == true)
+		_error->Insert(ErrorType, _("Couldn't find task '%s'"), pattern.c_str());
+	return PackageSet();
+}
+									/*}}}*/
+// canNotFindRegEx - handle the case no package is found by a regex	/*{{{*/
+PackageSet CacheSetHelper::canNotFindRegEx(pkgCacheFile &Cache, std::string pattern) {
+	if (ShowError == true)
+		_error->Insert(ErrorType, _("Couldn't find any package by regex '%s'"), pattern.c_str());
+	return PackageSet();
+}
+									/*}}}*/
+// canNotFindPackage - handle the case no package is found from a string/*{{{*/
+PackageSet CacheSetHelper::canNotFindPackage(pkgCacheFile &Cache, std::string const &str) {
+	return PackageSet();
+}
+									/*}}}*/
+// canNotFindAllVer							/*{{{*/
+VersionSet CacheSetHelper::canNotFindAllVer(pkgCacheFile &Cache,
+		pkgCache::PkgIterator const &Pkg) {
+	if (ShowError == true)
+		_error->Insert(ErrorType, _("Can't select versions from package '%s' as it is purely virtual"), Pkg.FullName(true).c_str());
+	return VersionSet();
+}
+									/*}}}*/
+// canNotFindInstCandVer						/*{{{*/
+VersionSet CacheSetHelper::canNotFindInstCandVer(pkgCacheFile &Cache,
+		pkgCache::PkgIterator const &Pkg) {
+	if (ShowError == true)
+		_error->Insert(ErrorType, _("Can't select installed nor candidate version from package '%s' as it has neither of them"), Pkg.FullName(true).c_str());
+	return VersionSet();
+}
+									/*}}}*/
+// canNotFindInstCandVer						/*{{{*/
+VersionSet CacheSetHelper::canNotFindCandInstVer(pkgCacheFile &Cache,
+		pkgCache::PkgIterator const &Pkg) {
+	if (ShowError == true)
+		_error->Insert(ErrorType, _("Can't select installed nor candidate version from package '%s' as it has neither of them"), Pkg.FullName(true).c_str());
+	return VersionSet();
+}
+									/*}}}*/
+// canNotFindNewestVer							/*{{{*/
+pkgCache::VerIterator CacheSetHelper::canNotFindNewestVer(pkgCacheFile &Cache,
+		pkgCache::PkgIterator const &Pkg) {
+	if (ShowError == true)
+		_error->Insert(ErrorType, _("Can't select newest version from package '%s' as it is purely virtual"), Pkg.FullName(true).c_str());
+	return pkgCache::VerIterator(Cache, 0);
+}
+									/*}}}*/
+// canNotFindCandidateVer						/*{{{*/
+pkgCache::VerIterator CacheSetHelper::canNotFindCandidateVer(pkgCacheFile &Cache,
+		pkgCache::PkgIterator const &Pkg) {
+	if (ShowError == true)
+		_error->Insert(ErrorType, _("Can't select candidate version from package %s as it has no candidate"), Pkg.FullName(true).c_str());
+	return pkgCache::VerIterator(Cache, 0);
+}
+									/*}}}*/
+// canNotFindInstalledVer						/*{{{*/
+pkgCache::VerIterator CacheSetHelper::canNotFindInstalledVer(pkgCacheFile &Cache,
+		pkgCache::PkgIterator const &Pkg) {
+	if (ShowError == true)
+		_error->Insert(ErrorType, _("Can't select installed version from package %s as it is not installed"), Pkg.FullName(true).c_str());
+	return pkgCache::VerIterator(Cache, 0);
+}
+									/*}}}*/
 }