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fix lzma-support detection via xz binary
[apt.git] / apt-pkg / aptconfiguration.cc
1 // -*- mode: cpp; mode: fold -*-
2 // Description /*{{{*/
3 /* ######################################################################
4
5 Provide access methods to various configuration settings,
6 setup defaults and returns validate settings.
7
8 ##################################################################### */
9 /*}}}*/
10 // Include Files /*{{{*/
11 #include <config.h>
12
13 #include <apt-pkg/aptconfiguration.h>
14 #include <apt-pkg/configuration.h>
15 #include <apt-pkg/error.h>
16 #include <apt-pkg/fileutl.h>
17 #include <apt-pkg/macros.h>
18 #include <apt-pkg/strutl.h>
19
20 #include <sys/types.h>
21 #include <dirent.h>
22 #include <stdio.h>
23 #include <fcntl.h>
24
25 #include <algorithm>
26 #include <string>
27 #include <vector>
28 /*}}}*/
29 namespace APT {
30 // getCompressionTypes - Return Vector of usbale compressiontypes /*{{{*/
31 // ---------------------------------------------------------------------
32 /* return a vector of compression types in the prefered order. */
33 std::vector<std::string>
34 const Configuration::getCompressionTypes(bool const &Cached) {
35 static std::vector<std::string> types;
36 if (types.empty() == false) {
37 if (Cached == true)
38 return types;
39 else
40 types.clear();
41 }
42
43 // setup the defaults for the compressiontypes => method mapping
44 _config->CndSet("Acquire::CompressionTypes::bz2","bzip2");
45 _config->CndSet("Acquire::CompressionTypes::xz","xz");
46 _config->CndSet("Acquire::CompressionTypes::lzma","lzma");
47 _config->CndSet("Acquire::CompressionTypes::gz","gzip");
48
49 setDefaultConfigurationForCompressors();
50 std::vector<APT::Configuration::Compressor> const compressors = getCompressors();
51
52 // accept non-list order as override setting for config settings on commandline
53 std::string const overrideOrder = _config->Find("Acquire::CompressionTypes::Order","");
54 if (overrideOrder.empty() == false)
55 types.push_back(overrideOrder);
56
57 // load the order setting into our vector
58 std::vector<std::string> const order = _config->FindVector("Acquire::CompressionTypes::Order");
59 for (std::vector<std::string>::const_iterator o = order.begin();
60 o != order.end(); ++o) {
61 if ((*o).empty() == true)
62 continue;
63 // ignore types we have no method ready to use
64 std::string const method = std::string("Acquire::CompressionTypes::").append(*o);
65 if (_config->Exists(method) == false)
66 continue;
67 // ignore types we have no app ready to use
68 std::string const app = _config->Find(method);
69 std::vector<APT::Configuration::Compressor>::const_iterator c = compressors.begin();
70 for (; c != compressors.end(); ++c)
71 if (c->Name == app)
72 break;
73 if (c == compressors.end())
74 continue;
75 types.push_back(*o);
76 }
77
78 // move again over the option tree to add all missing compression types
79 ::Configuration::Item const *Types = _config->Tree("Acquire::CompressionTypes");
80 if (Types != 0)
81 Types = Types->Child;
82
83 for (; Types != 0; Types = Types->Next) {
84 if (Types->Tag == "Order" || Types->Tag.empty() == true)
85 continue;
86 // ignore types we already have in the vector
87 if (std::find(types.begin(),types.end(),Types->Tag) != types.end())
88 continue;
89 // ignore types we have no app ready to use
90 std::vector<APT::Configuration::Compressor>::const_iterator c = compressors.begin();
91 for (; c != compressors.end(); ++c)
92 if (c->Name == Types->Value)
93 break;
94 if (c == compressors.end())
95 continue;
96 types.push_back(Types->Tag);
97 }
98
99 // add the special "uncompressed" type
100 if (std::find(types.begin(), types.end(), "uncompressed") == types.end())
101 {
102 std::string const uncompr = _config->FindFile("Dir::Bin::uncompressed", "");
103 if (uncompr.empty() == true || FileExists(uncompr) == true)
104 types.push_back("uncompressed");
105 }
106
107 return types;
108 }
109 /*}}}*/
110 // GetLanguages - Return Vector of Language Codes /*{{{*/
111 // ---------------------------------------------------------------------
112 /* return a vector of language codes in the prefered order.
113 the special word "environment" will be replaced with the long and the short
114 code of the local settings and it will be insured that this will not add
115 duplicates. So in an german local the setting "environment, de_DE, en, de"
116 will result in "de_DE, de, en".
117 The special word "none" is the stopcode for the not-All code vector */
118 std::vector<std::string> const Configuration::getLanguages(bool const &All,
119 bool const &Cached, char const ** const Locale) {
120 using std::string;
121
122 // The detection is boring and has a lot of cornercases,
123 // so we cache the results to calculated it only once.
124 std::vector<string> static allCodes;
125 std::vector<string> static codes;
126
127 // we have something in the cache
128 if (codes.empty() == false || allCodes.empty() == false) {
129 if (Cached == true) {
130 if(All == true && allCodes.empty() == false)
131 return allCodes;
132 else
133 return codes;
134 } else {
135 allCodes.clear();
136 codes.clear();
137 }
138 }
139
140 // Include all Language codes we have a Translation file for in /var/lib/apt/lists
141 // so they will be all included in the Cache.
142 std::vector<string> builtin;
143 DIR *D = opendir(_config->FindDir("Dir::State::lists").c_str());
144 if (D != 0) {
145 builtin.push_back("none");
146 for (struct dirent *Ent = readdir(D); Ent != 0; Ent = readdir(D)) {
147 string const name = SubstVar(Ent->d_name, "%5f", "_");
148 size_t const foundDash = name.rfind("-");
149 size_t const foundUnderscore = name.rfind("_", foundDash);
150 if (foundDash == string::npos || foundUnderscore == string::npos ||
151 foundDash <= foundUnderscore ||
152 name.substr(foundUnderscore+1, foundDash-(foundUnderscore+1)) != "Translation")
153 continue;
154 string const c = name.substr(foundDash+1);
155 if (unlikely(c.empty() == true) || c == "en")
156 continue;
157 // Skip unusual files, like backups or that alike
158 string::const_iterator s = c.begin();
159 for (;s != c.end(); ++s) {
160 if (isalpha(*s) == 0 && *s != '_')
161 break;
162 }
163 if (s != c.end())
164 continue;
165 if (std::find(builtin.begin(), builtin.end(), c) != builtin.end())
166 continue;
167 builtin.push_back(c);
168 }
169 }
170 closedir(D);
171
172 // FIXME: Remove support for the old APT::Acquire::Translation
173 // it was undocumented and so it should be not very widthly used
174 string const oldAcquire = _config->Find("APT::Acquire::Translation","");
175 if (oldAcquire.empty() == false && oldAcquire != "environment") {
176 // TRANSLATORS: the two %s are APT configuration options
177 _error->Notice("Option '%s' is deprecated. Please use '%s' instead, see 'man 5 apt.conf' for details.",
178 "APT::Acquire::Translation", "Acquire::Languages");
179 if (oldAcquire != "none")
180 codes.push_back(oldAcquire);
181 codes.push_back("en");
182 allCodes = codes;
183 for (std::vector<string>::const_iterator b = builtin.begin();
184 b != builtin.end(); ++b)
185 if (std::find(allCodes.begin(), allCodes.end(), *b) == allCodes.end())
186 allCodes.push_back(*b);
187 if (All == true)
188 return allCodes;
189 else
190 return codes;
191 }
192
193 // get the environment language codes: LC_MESSAGES (and later LANGUAGE)
194 // we extract both, a long and a short code and then we will
195 // check if we actually need both (rare) or if the short is enough
196 string const envMsg = string(Locale == 0 ? std::setlocale(LC_MESSAGES, NULL) : *Locale);
197 size_t const lenShort = (envMsg.find('_') != string::npos) ? envMsg.find('_') : 2;
198 size_t const lenLong = (envMsg.find_first_of(".@") != string::npos) ? envMsg.find_first_of(".@") : (lenShort + 3);
199
200 string const envLong = envMsg.substr(0,lenLong);
201 string const envShort = envLong.substr(0,lenShort);
202
203 // It is very likely we will need the environment codes later,
204 // so let us generate them now from LC_MESSAGES and LANGUAGE
205 std::vector<string> environment;
206 if (envShort != "C") {
207 // take care of LC_MESSAGES
208 if (envLong != envShort)
209 environment.push_back(envLong);
210 environment.push_back(envShort);
211 // take care of LANGUAGE
212 const char *language_env = getenv("LANGUAGE") == 0 ? "" : getenv("LANGUAGE");
213 string envLang = Locale == 0 ? language_env : *(Locale+1);
214 if (envLang.empty() == false) {
215 std::vector<string> env = VectorizeString(envLang,':');
216 short addedLangs = 0; // add a maximum of 3 fallbacks from the environment
217 for (std::vector<string>::const_iterator e = env.begin();
218 e != env.end() && addedLangs < 3; ++e) {
219 if (unlikely(e->empty() == true) || *e == "en")
220 continue;
221 if (*e == envLong || *e == envShort)
222 continue;
223 if (std::find(environment.begin(), environment.end(), *e) != environment.end())
224 continue;
225 ++addedLangs;
226 environment.push_back(*e);
227 }
228 }
229 } else {
230 environment.push_back("en");
231 }
232
233 // Support settings like Acquire::Languages=none on the command line to
234 // override the configuration settings vector of languages.
235 string const forceLang = _config->Find("Acquire::Languages","");
236 if (forceLang.empty() == false) {
237 if (forceLang == "none") {
238 codes.clear();
239 allCodes.clear();
240 allCodes.push_back("none");
241 } else {
242 if (forceLang == "environment")
243 codes = environment;
244 else
245 codes.push_back(forceLang);
246 allCodes = codes;
247 for (std::vector<string>::const_iterator b = builtin.begin();
248 b != builtin.end(); ++b)
249 if (std::find(allCodes.begin(), allCodes.end(), *b) == allCodes.end())
250 allCodes.push_back(*b);
251 }
252 if (All == true)
253 return allCodes;
254 else
255 return codes;
256 }
257
258 // cornercase: LANG=C, so we use only "en" Translation
259 if (envShort == "C") {
260 allCodes = codes = environment;
261 allCodes.insert(allCodes.end(), builtin.begin(), builtin.end());
262 if (All == true)
263 return allCodes;
264 else
265 return codes;
266 }
267
268 std::vector<string> const lang = _config->FindVector("Acquire::Languages");
269 // the default setting -> "environment, en"
270 if (lang.empty() == true) {
271 codes = environment;
272 if (envShort != "en")
273 codes.push_back("en");
274 allCodes = codes;
275 for (std::vector<string>::const_iterator b = builtin.begin();
276 b != builtin.end(); ++b)
277 if (std::find(allCodes.begin(), allCodes.end(), *b) == allCodes.end())
278 allCodes.push_back(*b);
279 if (All == true)
280 return allCodes;
281 else
282 return codes;
283 }
284
285 // the configs define the order, so add the environment
286 // then needed and ensure the codes are not listed twice.
287 bool noneSeen = false;
288 for (std::vector<string>::const_iterator l = lang.begin();
289 l != lang.end(); ++l) {
290 if (*l == "environment") {
291 for (std::vector<string>::const_iterator e = environment.begin();
292 e != environment.end(); ++e) {
293 if (std::find(allCodes.begin(), allCodes.end(), *e) != allCodes.end())
294 continue;
295 if (noneSeen == false)
296 codes.push_back(*e);
297 allCodes.push_back(*e);
298 }
299 continue;
300 } else if (*l == "none") {
301 noneSeen = true;
302 continue;
303 } else if (std::find(allCodes.begin(), allCodes.end(), *l) != allCodes.end())
304 continue;
305
306 if (noneSeen == false)
307 codes.push_back(*l);
308 allCodes.push_back(*l);
309 }
310
311 for (std::vector<string>::const_iterator b = builtin.begin();
312 b != builtin.end(); ++b)
313 if (std::find(allCodes.begin(), allCodes.end(), *b) == allCodes.end())
314 allCodes.push_back(*b);
315
316 if (All == true)
317 return allCodes;
318 else
319 return codes;
320 }
321 /*}}}*/
322 // checkLanguage - are we interested in the given Language? /*{{{*/
323 bool const Configuration::checkLanguage(std::string Lang, bool const All) {
324 // the empty Language is always interesting as it is the original
325 if (Lang.empty() == true)
326 return true;
327 // filenames are encoded, so undo this
328 Lang = SubstVar(Lang, "%5f", "_");
329 std::vector<std::string> const langs = getLanguages(All, true);
330 return (std::find(langs.begin(), langs.end(), Lang) != langs.end());
331 }
332 /*}}}*/
333 // getArchitectures - Return Vector of prefered Architectures /*{{{*/
334 std::vector<std::string> const Configuration::getArchitectures(bool const &Cached) {
335 using std::string;
336
337 std::vector<string> static archs;
338 if (likely(Cached == true) && archs.empty() == false)
339 return archs;
340
341 string const arch = _config->Find("APT::Architecture");
342 archs = _config->FindVector("APT::Architectures");
343
344 if (unlikely(arch.empty() == true))
345 return archs;
346
347 // FIXME: It is a bit unclean to have debian specific code here…
348 if (archs.empty() == true) {
349 archs.push_back(arch);
350
351 // Generate the base argument list for dpkg
352 std::vector<const char *> Args;
353 string Tmp = _config->Find("Dir::Bin::dpkg","dpkg");
354 {
355 string const dpkgChrootDir = _config->FindDir("DPkg::Chroot-Directory", "/");
356 size_t dpkgChrootLen = dpkgChrootDir.length();
357 if (dpkgChrootDir != "/" && Tmp.find(dpkgChrootDir) == 0) {
358 if (dpkgChrootDir[dpkgChrootLen - 1] == '/')
359 --dpkgChrootLen;
360 Tmp = Tmp.substr(dpkgChrootLen);
361 }
362 }
363 Args.push_back(Tmp.c_str());
364
365 // Stick in any custom dpkg options
366 ::Configuration::Item const *Opts = _config->Tree("DPkg::Options");
367 if (Opts != 0) {
368 Opts = Opts->Child;
369 for (; Opts != 0; Opts = Opts->Next)
370 {
371 if (Opts->Value.empty() == true)
372 continue;
373 Args.push_back(Opts->Value.c_str());
374 }
375 }
376
377 Args.push_back("--print-foreign-architectures");
378 Args.push_back(NULL);
379
380 int external[2] = {-1, -1};
381 if (pipe(external) != 0)
382 {
383 _error->WarningE("getArchitecture", "Can't create IPC pipe for dpkg --print-foreign-architectures");
384 return archs;
385 }
386
387 pid_t dpkgMultiArch = ExecFork();
388 if (dpkgMultiArch == 0) {
389 close(external[0]);
390 std::string const chrootDir = _config->FindDir("DPkg::Chroot-Directory");
391 int const nullfd = open("/dev/null", O_RDONLY);
392 dup2(nullfd, STDIN_FILENO);
393 dup2(external[1], STDOUT_FILENO);
394 dup2(nullfd, STDERR_FILENO);
395 if (chrootDir != "/" && chroot(chrootDir.c_str()) != 0 && chdir("/") != 0)
396 _error->WarningE("getArchitecture", "Couldn't chroot into %s for dpkg --print-foreign-architectures", chrootDir.c_str());
397 execvp(Args[0], (char**) &Args[0]);
398 _error->WarningE("getArchitecture", "Can't detect foreign architectures supported by dpkg!");
399 _exit(100);
400 }
401 close(external[1]);
402
403 FILE *dpkg = fdopen(external[0], "r");
404 if(dpkg != NULL) {
405 char buf[1024];
406 while (fgets(buf, sizeof(buf), dpkg) != NULL) {
407 char* arch = strtok(buf, " ");
408 while (arch != NULL) {
409 for (; isspace(*arch) != 0; ++arch);
410 if (arch[0] != '\0') {
411 char const* archend = arch;
412 for (; isspace(*archend) == 0 && *archend != '\0'; ++archend);
413 string a(arch, (archend - arch));
414 if (std::find(archs.begin(), archs.end(), a) == archs.end())
415 archs.push_back(a);
416 }
417 arch = strtok(NULL, " ");
418 }
419 }
420 fclose(dpkg);
421 }
422 ExecWait(dpkgMultiArch, "dpkg --print-foreign-architectures", true);
423 return archs;
424 }
425
426 if (archs.empty() == true ||
427 std::find(archs.begin(), archs.end(), arch) == archs.end())
428 archs.insert(archs.begin(), arch);
429
430 // erase duplicates and empty strings
431 for (std::vector<string>::reverse_iterator a = archs.rbegin();
432 a != archs.rend(); ++a) {
433 if (a->empty() == true || std::find(a + 1, archs.rend(), *a) != archs.rend())
434 archs.erase(a.base()-1);
435 if (a == archs.rend())
436 break;
437 }
438
439 return archs;
440 }
441 /*}}}*/
442 // checkArchitecture - are we interested in the given Architecture? /*{{{*/
443 bool const Configuration::checkArchitecture(std::string const &Arch) {
444 if (Arch == "all")
445 return true;
446 std::vector<std::string> const archs = getArchitectures(true);
447 return (std::find(archs.begin(), archs.end(), Arch) != archs.end());
448 }
449 /*}}}*/
450 // setDefaultConfigurationForCompressors /*{{{*/
451 void Configuration::setDefaultConfigurationForCompressors() {
452 // Set default application paths to check for optional compression types
453 _config->CndSet("Dir::Bin::bzip2", "/bin/bzip2");
454 _config->CndSet("Dir::Bin::xz", "/usr/bin/xz");
455 if (FileExists(_config->FindFile("Dir::Bin::xz")) == true) {
456 _config->Set("Dir::Bin::lzma", _config->FindFile("Dir::Bin::xz"));
457 _config->Set("APT::Compressor::lzma::Binary", "xz");
458 if (_config->Exists("APT::Compressor::lzma::CompressArg") == false) {
459 _config->Set("APT::Compressor::lzma::CompressArg::", "--format=lzma");
460 _config->Set("APT::Compressor::lzma::CompressArg::", "-9");
461 }
462 if (_config->Exists("APT::Compressor::lzma::UncompressArg") == false) {
463 _config->Set("APT::Compressor::lzma::UncompressArg::", "--format=lzma");
464 _config->Set("APT::Compressor::lzma::UncompressArg::", "-d");
465 }
466 } else {
467 _config->CndSet("Dir::Bin::lzma", "/usr/bin/lzma");
468 if (_config->Exists("APT::Compressor::lzma::CompressArg") == false) {
469 _config->Set("APT::Compressor::lzma::CompressArg::", "--suffix=");
470 _config->Set("APT::Compressor::lzma::CompressArg::", "-9");
471 }
472 if (_config->Exists("APT::Compressor::lzma::UncompressArg") == false) {
473 _config->Set("APT::Compressor::lzma::UncompressArg::", "--suffix=");
474 _config->Set("APT::Compressor::lzma::UncompressArg::", "-d");
475 }
476 }
477 }
478 /*}}}*/
479 // getCompressors - Return Vector of usbale compressors /*{{{*/
480 // ---------------------------------------------------------------------
481 /* return a vector of compressors used by apt-ftparchive in the
482 multicompress functionality or to detect data.tar files */
483 std::vector<APT::Configuration::Compressor>
484 const Configuration::getCompressors(bool const Cached) {
485 static std::vector<APT::Configuration::Compressor> compressors;
486 if (compressors.empty() == false) {
487 if (Cached == true)
488 return compressors;
489 else
490 compressors.clear();
491 }
492
493 setDefaultConfigurationForCompressors();
494
495 compressors.push_back(Compressor(".", "", "", NULL, NULL, 1));
496 if (_config->Exists("Dir::Bin::gzip") == false || FileExists(_config->FindFile("Dir::Bin::gzip")) == true)
497 compressors.push_back(Compressor("gzip",".gz","gzip","-9n","-d",2));
498 #ifdef HAVE_ZLIB
499 else
500 compressors.push_back(Compressor("gzip",".gz","false", NULL, NULL, 2));
501 #endif
502 if (_config->Exists("Dir::Bin::bzip2") == false || FileExists(_config->FindFile("Dir::Bin::bzip2")) == true)
503 compressors.push_back(Compressor("bzip2",".bz2","bzip2","-9","-d",3));
504 #ifdef HAVE_BZ2
505 else
506 compressors.push_back(Compressor("bzip2",".bz2","false", NULL, NULL, 3));
507 #endif
508 if (_config->Exists("Dir::Bin::xz") == false || FileExists(_config->FindFile("Dir::Bin::xz")) == true)
509 compressors.push_back(Compressor("xz",".xz","xz","-6","-d",4));
510 if (_config->Exists("Dir::Bin::lzma") == false || FileExists(_config->FindFile("Dir::Bin::lzma")) == true)
511 compressors.push_back(Compressor("lzma",".lzma","lzma","-9","-d",5));
512
513 std::vector<std::string> const comp = _config->FindVector("APT::Compressor");
514 for (std::vector<std::string>::const_iterator c = comp.begin();
515 c != comp.end(); ++c) {
516 if (*c == "." || *c == "gzip" || *c == "bzip2" || *c == "lzma" || *c == "xz")
517 continue;
518 compressors.push_back(Compressor(c->c_str(), std::string(".").append(*c).c_str(), c->c_str(), "-9", "-d", 100));
519 }
520
521 return compressors;
522 }
523 /*}}}*/
524 // getCompressorExtensions - supported data.tar extensions /*{{{*/
525 // ---------------------------------------------------------------------
526 /* */
527 std::vector<std::string> const Configuration::getCompressorExtensions() {
528 std::vector<APT::Configuration::Compressor> const compressors = getCompressors();
529 std::vector<std::string> ext;
530 for (std::vector<APT::Configuration::Compressor>::const_iterator c = compressors.begin();
531 c != compressors.end(); ++c)
532 if (c->Extension.empty() == false && c->Extension != ".")
533 ext.push_back(c->Extension);
534 return ext;
535 }
536 /*}}}*/
537 // Compressor constructor /*{{{*/
538 // ---------------------------------------------------------------------
539 /* */
540 Configuration::Compressor::Compressor(char const *name, char const *extension,
541 char const *binary,
542 char const *compressArg, char const *uncompressArg,
543 unsigned short const cost) {
544 std::string const config = std::string("APT::Compressor::").append(name).append("::");
545 Name = _config->Find(std::string(config).append("Name"), name);
546 Extension = _config->Find(std::string(config).append("Extension"), extension);
547 Binary = _config->Find(std::string(config).append("Binary"), binary);
548 Cost = _config->FindI(std::string(config).append("Cost"), cost);
549 std::string const compConf = std::string(config).append("CompressArg");
550 if (_config->Exists(compConf) == true)
551 CompressArgs = _config->FindVector(compConf);
552 else if (compressArg != NULL)
553 CompressArgs.push_back(compressArg);
554 std::string const uncompConf = std::string(config).append("UncompressArg");
555 if (_config->Exists(uncompConf) == true)
556 UncompressArgs = _config->FindVector(uncompConf);
557 else if (uncompressArg != NULL)
558 UncompressArgs.push_back(uncompressArg);
559 }
560 /*}}}*/
561 }
APT (for Cydia)