summaryrefslogtreecommitdiff
path: root/apt-pkg/edsp.cc
blob: d72370358a5d858676839e4dc6abbae1ac291360 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
// -*- mode: cpp; mode: fold -*-
// Description								/*{{{*/
/* ######################################################################
   Set of methods to help writing and reading everything needed for EDSP
   ##################################################################### */
									/*}}}*/
// Include Files							/*{{{*/
#include <apt-pkg/edsp.h>
#include <apt-pkg/error.h>
#include <apt-pkg/configuration.h>
#include <apt-pkg/version.h>
#include <apt-pkg/policy.h>
#include <apt-pkg/tagfile.h>

#include <apti18n.h>
#include <limits>

#include <stdio.h>
									/*}}}*/

// we could use pkgCache::DepType and ::Priority, but these would be localized strings…
const char * const EDSP::PrioMap[] = {0, "important", "required", "standard",
				      "optional", "extra"};
const char * const EDSP::DepMap[] = {"", "Depends", "PreDepends", "Suggests",
				     "Recommends" , "Conflicts", "Replaces",
				     "Obsoletes", "Breaks", "Enhances"};

// EDSP::WriteScenario - to the given file descriptor			/*{{{*/
bool EDSP::WriteScenario(pkgDepCache &Cache, FILE* output)
{
   for (pkgCache::PkgIterator Pkg = Cache.PkgBegin(); Pkg.end() == false; ++Pkg)
      for (pkgCache::VerIterator Ver = Pkg.VersionList(); Ver.end() == false; ++Ver)
      {
	 WriteScenarioVersion(Cache, output, Pkg, Ver);
	 WriteScenarioDependency(Cache, output, Pkg, Ver);
	 fprintf(output, "\n");
      }
   return true;
}
									/*}}}*/
// EDSP::WriteLimitedScenario - to the given file descriptor		/*{{{*/
bool EDSP::WriteLimitedScenario(pkgDepCache &Cache, FILE* output,
				APT::PackageSet const &pkgset)
{
   for (APT::PackageSet::const_iterator Pkg = pkgset.begin(); Pkg != pkgset.end(); ++Pkg)
      for (pkgCache::VerIterator Ver = Pkg.VersionList(); Ver.end() == false; ++Ver)
      {
	 WriteScenarioVersion(Cache, output, Pkg, Ver);
	 WriteScenarioLimitedDependency(Cache, output, Pkg, Ver, pkgset);
	 fprintf(output, "\n");
      }
   return true;
}
									/*}}}*/
// EDSP::WriteScenarioVersion						/*{{{*/
void EDSP::WriteScenarioVersion(pkgDepCache &Cache, FILE* output, pkgCache::PkgIterator const &Pkg,
				pkgCache::VerIterator const &Ver)
{
   fprintf(output, "Package: %s\n", Pkg.Name());
   fprintf(output, "Architecture: %s\n", Ver.Arch());
   fprintf(output, "Version: %s\n", Ver.VerStr());
   if (Pkg.CurrentVer() == Ver)
      fprintf(output, "Installed: yes\n");
   if (Pkg->SelectedState == pkgCache::State::Hold)
      fprintf(output, "Hold: yes\n");
   fprintf(output, "APT-ID: %d\n", Ver->ID);
   fprintf(output, "Priority: %s\n", PrioMap[Ver->Priority]);
   if ((Pkg->Flags & pkgCache::Flag::Essential) == pkgCache::Flag::Essential)
      fprintf(output, "Essential: yes\n");
   fprintf(output, "Section: %s\n", Ver.Section());
   if (Ver->MultiArch == pkgCache::Version::Allowed || Ver->MultiArch == pkgCache::Version::AllAllowed)
      fprintf(output, "Multi-Arch: allowed\n");
   else if (Ver->MultiArch == pkgCache::Version::Foreign || Ver->MultiArch == pkgCache::Version::AllForeign)
      fprintf(output, "Multi-Arch: foreign\n");
   else if (Ver->MultiArch == pkgCache::Version::Same)
      fprintf(output, "Multi-Arch: same\n");
   signed short Pin = std::numeric_limits<signed short>::min();
   for (pkgCache::VerFileIterator File = Ver.FileList(); File.end() == false; ++File) {
      signed short const p = Cache.GetPolicy().GetPriority(File.File());
      if (Pin < p)
	 Pin = p;
   }
   fprintf(output, "APT-Pin: %d\n", Pin);
   if (Cache.GetCandidateVer(Pkg) == Ver)
      fprintf(output, "APT-Candidate: yes\n");
   if ((Cache[Pkg].Flags & pkgCache::Flag::Auto) == pkgCache::Flag::Auto)
      fprintf(output, "APT-Automatic: yes\n");
}
									/*}}}*/
// EDSP::WriteScenarioDependency					/*{{{*/
void EDSP::WriteScenarioDependency(pkgDepCache &Cache, FILE* output, pkgCache::PkgIterator const &Pkg,
				pkgCache::VerIterator const &Ver)
{
   std::string dependencies[pkgCache::Dep::Enhances + 1];
   bool orGroup = false;
   for (pkgCache::DepIterator Dep = Ver.DependsList(); Dep.end() == false; ++Dep)
   {
      // Ignore implicit dependencies for multiarch here
      if (strcmp(Pkg.Arch(), Dep.TargetPkg().Arch()) != 0)
	 continue;
      if (orGroup == false)
	 dependencies[Dep->Type].append(", ");
      dependencies[Dep->Type].append(Dep.TargetPkg().Name());
      if (Dep->Version != 0)
	 dependencies[Dep->Type].append(" (").append(pkgCache::CompTypeDeb(Dep->CompareOp)).append(" ").append(Dep.TargetVer()).append(")");
      if ((Dep->CompareOp & pkgCache::Dep::Or) == pkgCache::Dep::Or)
      {
	 dependencies[Dep->Type].append(" | ");
	 orGroup = true;
      }
      else
	 orGroup = false;
   }
   for (int i = 1; i < pkgCache::Dep::Enhances + 1; ++i)
      if (dependencies[i].empty() == false)
	 fprintf(output, "%s: %s\n", DepMap[i], dependencies[i].c_str()+2);
   string provides;
   for (pkgCache::PrvIterator Prv = Ver.ProvidesList(); Prv.end() == false; ++Prv)
   {
      // Ignore implicit provides for multiarch here
      if (strcmp(Pkg.Arch(), Prv.ParentPkg().Arch()) != 0 || strcmp(Pkg.Name(),Prv.Name()) == 0)
	 continue;
      provides.append(", ").append(Prv.Name());
   }
   if (provides.empty() == false)
      fprintf(output, "Provides: %s\n", provides.c_str()+2);
}
									/*}}}*/
// EDSP::WriteScenarioLimitedDependency					/*{{{*/
void EDSP::WriteScenarioLimitedDependency(pkgDepCache &Cache, FILE* output,
					  pkgCache::PkgIterator const &Pkg,
					  pkgCache::VerIterator const &Ver,
					  APT::PackageSet const &pkgset)
{
   std::string dependencies[pkgCache::Dep::Enhances + 1];
   bool orGroup = false;
   for (pkgCache::DepIterator Dep = Ver.DependsList(); Dep.end() == false; ++Dep)
   {
      // Ignore implicit dependencies for multiarch here
      if (strcmp(Pkg.Arch(), Dep.TargetPkg().Arch()) != 0)
	 continue;
      if (orGroup == false)
      {
	 if (pkgset.find(Dep.TargetPkg()) == pkgset.end())
	    continue;
	 dependencies[Dep->Type].append(", ");
      }
      else if (pkgset.find(Dep.TargetPkg()) == pkgset.end())
      {
	 if ((Dep->CompareOp & pkgCache::Dep::Or) == pkgCache::Dep::Or)
	    continue;
	 dependencies[Dep->Type].erase(dependencies[Dep->Type].end()-3, dependencies[Dep->Type].end());
	 orGroup = false;
	 continue;
      }
      dependencies[Dep->Type].append(Dep.TargetPkg().Name());
      if (Dep->Version != 0)
	 dependencies[Dep->Type].append(" (").append(pkgCache::CompTypeDeb(Dep->CompareOp)).append(" ").append(Dep.TargetVer()).append(")");
      if ((Dep->CompareOp & pkgCache::Dep::Or) == pkgCache::Dep::Or)
      {
	 dependencies[Dep->Type].append(" | ");
	 orGroup = true;
      }
      else
	 orGroup = false;
   }
   for (int i = 1; i < pkgCache::Dep::Enhances + 1; ++i)
      if (dependencies[i].empty() == false)
	 fprintf(output, "%s: %s\n", DepMap[i], dependencies[i].c_str()+2);
   string provides;
   for (pkgCache::PrvIterator Prv = Ver.ProvidesList(); Prv.end() == false; ++Prv)
   {
      // Ignore implicit provides for multiarch here
      if (strcmp(Pkg.Arch(), Prv.ParentPkg().Arch()) != 0 || strcmp(Pkg.Name(),Prv.Name()) == 0)
	 continue;
      if (pkgset.find(Prv.ParentPkg()) == pkgset.end())
	 continue;
      provides.append(", ").append(Prv.Name());
   }
   if (provides.empty() == false)
      fprintf(output, "Provides: %s\n", provides.c_str()+2);
}
									/*}}}*/
// EDSP::WriteRequest - to the given file descriptor			/*{{{*/
bool EDSP::WriteRequest(pkgDepCache &Cache, FILE* output, bool const Upgrade,
			bool const DistUpgrade, bool const AutoRemove)
{
   string del, inst;
   for (pkgCache::PkgIterator Pkg = Cache.PkgBegin(); Pkg.end() == false; ++Pkg)
   {
      string* req;
      if (Cache[Pkg].Delete() == true)
	 req = &del;
      else if (Cache[Pkg].NewInstall() == true || Cache[Pkg].Upgrade() == true)
	 req = &inst;
      else
	 continue;
      req->append(" ").append(Pkg.FullName());
   }
   fprintf(output, "Request: EDSP 0.4\n");
   if (del.empty() == false)
      fprintf(output, "Remove: %s\n", del.c_str()+1);
   if (inst.empty() == false)
      fprintf(output, "Install: %s\n", inst.c_str()+1);
   if (Upgrade == true)
      fprintf(output, "Upgrade: yes\n");
   if (DistUpgrade == true)
      fprintf(output, "Dist-Upgrade: yes\n");
   if (AutoRemove == true)
      fprintf(output, "Autoremove: yes\n");
   if (_config->FindB("APT::Solver::Strict-Pinning", true) == false)
      fprintf(output, "Strict-Pinning: no\n");
   string solverpref("APT::Solver::");
   solverpref.append(_config->Find("APT::Solver::Name", "internal")).append("::Preferences");
   if (_config->Exists(solverpref) == true)
      fprintf(output, "Preferences: %s\n", _config->Find(solverpref,"").c_str());
   fprintf(output, "\n");

   return true;
}
									/*}}}*/
// EDSP::ReadResponse - from the given file descriptor			/*{{{*/
bool EDSP::ReadResponse(int const input, pkgDepCache &Cache) {
	/* We build an map id to mmap offset here
	   In theory we could use the offset as ID, but then VersionCount
	   couldn't be used to create other versionmappings anymore and it
	   would be too easy for a (buggy) solver to segfault APT… */
	unsigned long long const VersionCount = Cache.Head().VersionCount;
	unsigned long VerIdx[VersionCount];
	for (pkgCache::PkgIterator P = Cache.PkgBegin(); P.end() == false; ++P) {
		for (pkgCache::VerIterator V = P.VersionList(); V.end() == false; ++V)
			VerIdx[V->ID] = V.Index();
		Cache[P].Marked = true;
		Cache[P].Garbage = false;
	}

	FileFd in;
	in.OpenDescriptor(input, FileFd::ReadOnly);
	pkgTagFile response(&in, 100);
	pkgTagSection section;

	while (response.Step(section) == true) {
		std::string type;
		if (section.Exists("Install") == true)
			type = "Install";
		else if (section.Exists("Remove") == true)
			type = "Remove";
		else if (section.Exists("Progress") == true) {
			std::clog << TimeRFC1123(time(NULL)) << " ";
			ioprintf(std::clog, "[ %3d%% ] ", section.FindI("Percentage", 0));
			std::clog << section.FindS("Progress") << " - ";
			string const msg = section.FindS("Message");
			if (msg.empty() == true)
				std::clog << "Solver is still working on the solution" << std::endl;
			else
				std::clog << msg << std::endl;
			continue;
		} else if (section.Exists("Autoremove") == true)
			type = "Autoremove";
		else
			continue;

		size_t const id = section.FindULL(type.c_str(), VersionCount);
		if (id == VersionCount) {
			_error->Warning("Unable to parse %s request with id value '%s'!", type.c_str(), section.FindS(type.c_str()).c_str());
			continue;
		} else if (id > Cache.Head().VersionCount) {
			_error->Warning("ID value '%s' in %s request stanza is to high to refer to a known version!", section.FindS(type.c_str()).c_str(), type.c_str());
			continue;
		}

		pkgCache::VerIterator Ver(Cache.GetCache(), Cache.GetCache().VerP + VerIdx[id]);
		Cache.SetCandidateVersion(Ver);
		if (type == "Install")
			Cache.MarkInstall(Ver.ParentPkg(), false, false);
		else if (type == "Remove")
			Cache.MarkDelete(Ver.ParentPkg(), false);
		else if (type == "Autoremove") {
			Cache[Ver.ParentPkg()].Marked = false;
			Cache[Ver.ParentPkg()].Garbage = true;
		}
	}
	return true;
}
									/*}}}*/
// EDSP::ReadLine - first line from the given file descriptor		/*{{{*/
// ---------------------------------------------------------------------
/* Little helper method to read a complete line into a string. Similar to
   fgets but we need to use the low-level read() here as otherwise the
   listparser will be confused later on as mixing of fgets and read isn't
   a supported action according to the manpages and results are undefined */
bool EDSP::ReadLine(int const input, std::string &line) {
	char one;
	ssize_t data = 0;
	line.erase();
	line.reserve(100);
	while ((data = read(input, &one, sizeof(one))) != -1) {
		if (data != 1)
			continue;
		if (one == '\n')
			return true;
		if (one == '\r')
			continue;
		if (line.empty() == true && isblank(one) != 0)
			continue;
		line += one;
	}
	return false;
}
									/*}}}*/
// EDSP::StringToBool - convert yes/no to bool				/*{{{*/
// ---------------------------------------------------------------------
/* we are not as lazy as we are in the global StringToBool as we really
   only accept yes/no here - but we will ignore leading spaces */
bool EDSP::StringToBool(char const *answer, bool const defValue) {
   for (; isspace(*answer) != 0; ++answer);
   if (strncasecmp(answer, "yes", 3) == 0)
      return true;
   else if (strncasecmp(answer, "no", 2) == 0)
      return false;
   else
      _error->Warning("Value '%s' is not a boolean 'yes' or 'no'!", answer);
   return defValue;
}
									/*}}}*/
// EDSP::ReadRequest - first stanza from the given file descriptor	/*{{{*/
bool EDSP::ReadRequest(int const input, std::list<std::string> &install,
			std::list<std::string> &remove, bool &upgrade,
			bool &distUpgrade, bool &autoRemove)
{
   install.clear();
   remove.clear();
   upgrade = false;
   distUpgrade = false;
   autoRemove = false;
   std::string line;
   while (ReadLine(input, line) == true)
   {
      // Skip empty lines before request
      if (line.empty() == true)
	 continue;
      // The first Tag must be a request, so search for it
      if (line.compare(0, 8, "Request:") != 0)
	 continue;

      while (ReadLine(input, line) == true)
      {
	 // empty lines are the end of the request
	 if (line.empty() == true)
	    return true;

	 std::list<std::string> *request = NULL;
	 if (line.compare(0, 8, "Install:") == 0)
	 {
	    line.erase(0, 8);
	    request = &install;
	 }
	 else if (line.compare(0, 7, "Remove:") == 0)
	 {
	    line.erase(0, 7);
	    request = &remove;
	 }
	 else if (line.compare(0, 8, "Upgrade:") == 0)
	    upgrade = EDSP::StringToBool(line.c_str() + 9, false);
	 else if (line.compare(0, 13, "Dist-Upgrade:") == 0)
	    distUpgrade = EDSP::StringToBool(line.c_str() + 14, false);
	 else if (line.compare(0, 11, "Autoremove:") == 0)
	    autoRemove = EDSP::StringToBool(line.c_str() + 12, false);
	 else
	    _error->Warning("Unknown line in EDSP Request stanza: %s", line.c_str());

	 if (request == NULL)
	    continue;
	 size_t end = line.length();
	 do {
	    size_t begin = line.rfind(' ');
	    if (begin == std::string::npos)
	    {
	       request->push_back(line.substr(0, end));
	       break;
	    }
	    else if (begin < end)
	       request->push_back(line.substr(begin + 1, end));
	    line.erase(begin);
	    end = line.find_last_not_of(' ');
	 } while (end != std::string::npos);
      }
   }
   return false;
}
									/*}}}*/
// EDSP::ApplyRequest - first stanza from the given file descriptor	/*{{{*/
bool EDSP::ApplyRequest(std::list<std::string> const &install,
			 std::list<std::string> const &remove,
			 pkgDepCache &Cache)
{
	for (std::list<std::string>::const_iterator i = install.begin();
	     i != install.end(); ++i) {
		pkgCache::PkgIterator P = Cache.FindPkg(*i);
		if (P.end() == true)
			_error->Warning("Package %s is not known, so can't be installed", i->c_str());
		else
			Cache.MarkInstall(P, false);
	}

	for (std::list<std::string>::const_iterator i = remove.begin();
	     i != remove.end(); ++i) {
		pkgCache::PkgIterator P = Cache.FindPkg(*i);
		if (P.end() == true)
			_error->Warning("Package %s is not known, so can't be installed", i->c_str());
		else
			Cache.MarkDelete(P);
	}
	return true;
}
									/*}}}*/
// EDSP::WriteSolution - to the given file descriptor			/*{{{*/
bool EDSP::WriteSolution(pkgDepCache &Cache, FILE* output)
{
   bool const Debug = _config->FindB("Debug::EDSP::WriteSolution", false);
   for (pkgCache::PkgIterator Pkg = Cache.PkgBegin(); Pkg.end() == false; ++Pkg)
   {
      if (Cache[Pkg].Delete() == true)
      {
	 fprintf(output, "Remove: %d\n", Pkg.CurrentVer()->ID);
	 if (Debug == true)
	    fprintf(output, "Package: %s\nVersion: %s\n", Pkg.FullName().c_str(), Pkg.CurrentVer().VerStr());
      }
      else if (Cache[Pkg].NewInstall() == true || Cache[Pkg].Upgrade() == true)
      {
	 fprintf(output, "Install: %d\n", Cache.GetCandidateVer(Pkg)->ID);
	 if (Debug == true)
	    fprintf(output, "Package: %s\nVersion: %s\n", Pkg.FullName().c_str(), Cache.GetCandidateVer(Pkg).VerStr());
      }
      else if (Cache[Pkg].Garbage == true)
      {
	 fprintf(output, "Autoremove: %d\n", Pkg.CurrentVer()->ID);
	 if (Debug == true)
	    fprintf(output, "Package: %s\nVersion: %s\n", Pkg.FullName().c_str(), Pkg.CurrentVer().VerStr());
	    fprintf(stderr, "Autoremove: %s\nVersion: %s\n", Pkg.FullName().c_str(), Pkg.CurrentVer().VerStr());
      }
      else
	 continue;
      fprintf(output, "\n");
   }

   return true;
}
									/*}}}*/
// EDSP::WriteProgess - pulse to the given file descriptor		/*{{{*/
bool EDSP::WriteProgress(unsigned short const percent, const char* const message, FILE* output) {
	fprintf(output, "Progress: %s\n", TimeRFC1123(time(NULL)).c_str());
	fprintf(output, "Percentage: %d\n", percent);
	fprintf(output, "Message: %s\n\n", message);
	fflush(output);
	return true;
}
									/*}}}*/
bool EDSP::WriteError(std::string const &message, FILE* output) { return false; }

// EDSP::ExecuteSolver - fork requested solver and setup ipc pipes	{{{*/
bool EDSP::ExecuteSolver(const char* const solver, int *solver_in, int *solver_out) {
	std::vector<std::string> const solverDirs = _config->FindVector("Dir::Bin::Solvers");
	std::string file;
	for (std::vector<std::string>::const_iterator dir = solverDirs.begin();
	     dir != solverDirs.end(); ++dir) {
		file = flCombine(*dir, solver);
		if (RealFileExists(file.c_str()) == true)
			break;
		file.clear();
	}

	if (file.empty() == true)
		return _error->Error("Can't call external solver '%s' as it is not in a configured directory!", solver);
	int external[4] = {-1, -1, -1, -1};
	if (pipe(external) != 0 || pipe(external + 2) != 0)
		return _error->Errno("Resolve", "Can't create needed IPC pipes for EDSP");
	for (int i = 0; i < 4; ++i)
		SetCloseExec(external[i], true);

	pid_t Solver = ExecFork();
	if (Solver == 0) {
		dup2(external[0], STDIN_FILENO);
		dup2(external[3], STDOUT_FILENO);
		const char* calling[2] = { file.c_str(), 0 };
		execv(calling[0], (char**) calling);
		std::cerr << "Failed to execute solver '" << solver << "'!" << std::endl;
		_exit(100);
	}
	close(external[0]);
	close(external[3]);

	if (WaitFd(external[1], true, 5) == false)
		return _error->Errno("Resolve", "Timed out while Waiting on availability of solver stdin");

	*solver_in = external[1];
	*solver_out = external[2];
	return true;
}
									/*}}}*/
// EDSP::ResolveExternal - resolve problems by asking external for help	{{{*/
bool EDSP::ResolveExternal(const char* const solver, pkgDepCache &Cache,
			 bool const upgrade, bool const distUpgrade,
			 bool const autoRemove) {
	int solver_in, solver_out;
	if (EDSP::ExecuteSolver(solver, &solver_in, &solver_out) == false)
		return false;

	FILE* output = fdopen(solver_in, "w");
	if (output == NULL)
		return _error->Errno("Resolve", "fdopen on solver stdin failed");
	EDSP::WriteRequest(Cache, output, upgrade, distUpgrade, autoRemove);
	EDSP::WriteScenario(Cache, output);
	fclose(output);

	if (EDSP::ReadResponse(solver_out, Cache) == false)
		return _error->Error("Reading solver response failed");

	return true;
}
									/*}}}*/