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1 // -*- mode: cpp; mode: fold -*-
2 // Description /*{{{*/
3 // $Id: mirror.cc,v 1.59 2004/05/08 19:42:35 mdz Exp $
4 /* ######################################################################
5
6 Mirror Aquire Method - This is the Mirror aquire method for APT.
7
8 ##################################################################### */
9 /*}}}*/
10 // Include Files /*{{{*/
11 #include <config.h>
12
13 #include <apt-pkg/aptconfiguration.h>
14 #include <apt-pkg/fileutl.h>
15 #include <apt-pkg/acquire-method.h>
16 #include <apt-pkg/acquire-item.h>
17 #include <apt-pkg/acquire.h>
18 #include <apt-pkg/error.h>
19 #include <apt-pkg/hashes.h>
20 #include <apt-pkg/sourcelist.h>
21 #include <apt-pkg/configuration.h>
22 #include <apt-pkg/metaindex.h>
23
24 #include <algorithm>
25 #include <fstream>
26 #include <iostream>
27
28 #include <stdarg.h>
29 #include <sys/stat.h>
30 #include <sys/types.h>
31 #include <sys/utsname.h>
32 #include <dirent.h>
33
34 using namespace std;
35
36 #include<sstream>
37
38 #include "mirror.h"
39 #include "http.h"
40 #include <apti18n.h>
41 /*}}}*/
42
43 /* Done:
44 * - works with http (only!)
45 * - always picks the first mirror from the list
46 * - call out to problem reporting script
47 * - supports "deb mirror://host/path/to/mirror-list/// dist component"
48 * - uses pkgAcqMethod::FailReason() to have a string representation
49 * of the failure that is also send to LP
50 *
51 * TODO:
52 * - deal with runing as non-root because we can't write to the lists
53 dir then -> use the cached mirror file
54 * - better method to download than having a pkgAcquire interface here
55 * and better error handling there!
56 * - support more than http
57 * - testing :)
58 */
59
60 MirrorMethod::MirrorMethod()
61 : HttpMethod(), DownloadedMirrorFile(false), Debug(false)
62 {
63 };
64
65 // HttpMethod::Configuration - Handle a configuration message /*{{{*/
66 // ---------------------------------------------------------------------
67 /* We stash the desired pipeline depth */
68 bool MirrorMethod::Configuration(string Message)
69 {
70 if (pkgAcqMethod::Configuration(Message) == false)
71 return false;
72 Debug = _config->FindB("Debug::Acquire::mirror",false);
73
74 return true;
75 }
76 /*}}}*/
77
78 // clean the mirrors dir based on ttl information
79 bool MirrorMethod::Clean(string Dir)
80 {
81 vector<metaIndex *>::const_iterator I;
82
83 if(Debug)
84 clog << "MirrorMethod::Clean(): " << Dir << endl;
85
86 if(Dir == "/")
87 return _error->Error("will not clean: '/'");
88
89 // read sources.list
90 pkgSourceList list;
91 list.ReadMainList();
92
93 DIR *D = opendir(Dir.c_str());
94 if (D == 0)
95 return _error->Errno("opendir",_("Unable to read %s"),Dir.c_str());
96
97 string StartDir = SafeGetCWD();
98 if (chdir(Dir.c_str()) != 0)
99 {
100 closedir(D);
101 return _error->Errno("chdir",_("Unable to change to %s"),Dir.c_str());
102 }
103
104 for (struct dirent *Dir = readdir(D); Dir != 0; Dir = readdir(D))
105 {
106 // Skip some files..
107 if (strcmp(Dir->d_name,"lock") == 0 ||
108 strcmp(Dir->d_name,"partial") == 0 ||
109 strcmp(Dir->d_name,".") == 0 ||
110 strcmp(Dir->d_name,"..") == 0)
111 continue;
112
113 // see if we have that uri
114 for(I=list.begin(); I != list.end(); ++I)
115 {
116 string uri = (*I)->GetURI();
117 if(uri.find("mirror://") != 0)
118 continue;
119 string BaseUri = uri.substr(0,uri.size()-1);
120 if (URItoFileName(BaseUri) == Dir->d_name)
121 break;
122 }
123 // nothing found, nuke it
124 if (I == list.end())
125 unlink(Dir->d_name);
126 };
127
128 chdir(StartDir.c_str());
129 closedir(D);
130 return true;
131 }
132
133
134 bool MirrorMethod::DownloadMirrorFile(string mirror_uri_str)
135 {
136 // not that great to use pkgAcquire here, but we do not have
137 // any other way right now
138 string fetch = BaseUri;
139 fetch.replace(0,strlen("mirror://"),"http://");
140
141 #if 0 // no need for this, the getArchitectures() will also include the main
142 // arch
143 // append main architecture
144 fetch += "?arch=" + _config->Find("Apt::Architecture");
145 #endif
146
147 // append all architectures
148 std::vector<std::string> vec = APT::Configuration::getArchitectures();
149 for (std::vector<std::string>::const_iterator I = vec.begin();
150 I != vec.end(); I++)
151 if (I == vec.begin())
152 fetch += "?arch" + (*I);
153 else
154 fetch += "&arch=" + (*I);
155
156 // append the dist as a query string
157 if (Dist != "")
158 fetch += "&dist=" + Dist;
159
160 if(Debug)
161 clog << "MirrorMethod::DownloadMirrorFile(): '" << fetch << "'"
162 << " to " << MirrorFile << endl;
163
164 pkgAcquire Fetcher;
165 new pkgAcqFile(&Fetcher, fetch, "", 0, "", "", "", MirrorFile);
166 bool res = (Fetcher.Run() == pkgAcquire::Continue);
167 if(res) {
168 DownloadedMirrorFile = true;
169 chmod(MirrorFile.c_str(), 0644);
170 }
171 Fetcher.Shutdown();
172
173 if(Debug)
174 clog << "MirrorMethod::DownloadMirrorFile() success: " << res << endl;
175
176 return res;
177 }
178
179 // Randomizes the lines in the mirror file, this is used so that
180 // we spread the load on the mirrors evenly
181 bool MirrorMethod::RandomizeMirrorFile(string mirror_file)
182 {
183 vector<string> content;
184 string line;
185
186 if (!FileExists(mirror_file))
187 return false;
188
189 // read
190 ifstream in(mirror_file.c_str());
191 while ( !in.eof() ) {
192 getline(in, line);
193 content.push_back(line);
194 }
195
196 // we want the file to be random for each different machine, but also
197 // "stable" on the same machine. this is to avoid running into out-of-sync
198 // issues (i.e. Release/Release.gpg different on each mirror)
199 struct utsname buf;
200 int seed=1, i;
201 if(uname(&buf) == 0) {
202 for(i=0,seed=1; buf.nodename[i] != 0; i++) {
203 seed = seed * 31 + buf.nodename[i];
204 }
205 }
206 srand( seed );
207 random_shuffle(content.begin(), content.end());
208
209 // write
210 ofstream out(mirror_file.c_str());
211 while ( !content.empty()) {
212 line = content.back();
213 content.pop_back();
214 out << line << "\n";
215 }
216
217 return true;
218 }
219
220 /* convert a the Queue->Uri back to the mirror base uri and look
221 * at all mirrors we have for this, this is needed as queue->uri
222 * may point to different mirrors (if TryNextMirror() was run)
223 */
224 void MirrorMethod::CurrentQueueUriToMirror()
225 {
226 // already in mirror:// style so nothing to do
227 if(Queue->Uri.find("mirror://") == 0)
228 return;
229
230 // find current mirror and select next one
231 for (vector<string>::const_iterator mirror = AllMirrors.begin();
232 mirror != AllMirrors.end(); ++mirror)
233 {
234 if (Queue->Uri.find(*mirror) == 0)
235 {
236 Queue->Uri.replace(0, mirror->length(), BaseUri);
237 return;
238 }
239 }
240 _error->Error("Internal error: Failed to convert %s back to %s",
241 Queue->Uri.c_str(), BaseUri.c_str());
242 }
243
244 bool MirrorMethod::TryNextMirror()
245 {
246 // find current mirror and select next one
247 for (vector<string>::const_iterator mirror = AllMirrors.begin();
248 mirror != AllMirrors.end(); ++mirror)
249 {
250 if (Queue->Uri.find(*mirror) != 0)
251 continue;
252
253 vector<string>::const_iterator nextmirror = mirror + 1;
254 if (nextmirror == AllMirrors.end())
255 break;
256 Queue->Uri.replace(0, mirror->length(), *nextmirror);
257 if (Debug)
258 clog << "TryNextMirror: " << Queue->Uri << endl;
259
260 // inform parent
261 UsedMirror = *nextmirror;
262 Log("Switching mirror");
263 return true;
264 }
265
266 if (Debug)
267 clog << "TryNextMirror could not find another mirror to try" << endl;
268
269 return false;
270 }
271
272 bool MirrorMethod::InitMirrors()
273 {
274 // if we do not have a MirrorFile, fallback
275 if(!FileExists(MirrorFile))
276 {
277 // FIXME: fallback to a default mirror here instead
278 // and provide a config option to define that default
279 return _error->Error(_("No mirror file '%s' found "), MirrorFile.c_str());
280 }
281
282 if (access(MirrorFile.c_str(), R_OK) != 0)
283 {
284 // FIXME: fallback to a default mirror here instead
285 // and provide a config option to define that default
286 return _error->Error(_("Can not read mirror file '%s'"), MirrorFile.c_str());
287 }
288
289 // FIXME: make the mirror selection more clever, do not
290 // just use the first one!
291 // BUT: we can not make this random, the mirror has to be
292 // stable accross session, because otherwise we can
293 // get into sync issues (got indexfiles from mirror A,
294 // but packages from mirror B - one might be out of date etc)
295 ifstream in(MirrorFile.c_str());
296 string s;
297 while (!in.eof())
298 {
299 getline(in, s);
300
301 // ignore lines that start with #
302 if (s.find("#") == 0)
303 continue;
304 // ignore empty lines
305 if (s.size() == 0)
306 continue;
307 // ignore non http lines
308 if (s.find("http://") != 0)
309 continue;
310
311 AllMirrors.push_back(s);
312 }
313 Mirror = AllMirrors[0];
314 UsedMirror = Mirror;
315 return true;
316 }
317
318 string MirrorMethod::GetMirrorFileName(string mirror_uri_str)
319 {
320 /*
321 - a mirror_uri_str looks like this:
322 mirror://people.ubuntu.com/~mvo/apt/mirror/mirrors/dists/feisty/Release.gpg
323
324 - the matching source.list entry
325 deb mirror://people.ubuntu.com/~mvo/apt/mirror/mirrors feisty main
326
327 - we actually want to go after:
328 http://people.ubuntu.com/~mvo/apt/mirror/mirrors
329
330 And we need to save the BaseUri for later:
331 - mirror://people.ubuntu.com/~mvo/apt/mirror/mirrors
332
333 FIXME: what if we have two similar prefixes?
334 mirror://people.ubuntu.com/~mvo/mirror
335 mirror://people.ubuntu.com/~mvo/mirror2
336 then mirror_uri_str looks like:
337 mirror://people.ubuntu.com/~mvo/apt/mirror/dists/feisty/Release.gpg
338 mirror://people.ubuntu.com/~mvo/apt/mirror2/dists/feisty/Release.gpg
339 we search sources.list and find:
340 mirror://people.ubuntu.com/~mvo/apt/mirror
341 in both cases! So we need to apply some domain knowledge here :( and
342 check for /dists/ or /Release.gpg as suffixes
343 */
344 string name;
345 if(Debug)
346 std::cerr << "GetMirrorFileName: " << mirror_uri_str << std::endl;
347
348 // read sources.list and find match
349 vector<metaIndex *>::const_iterator I;
350 pkgSourceList list;
351 list.ReadMainList();
352 for(I=list.begin(); I != list.end(); ++I)
353 {
354 string uristr = (*I)->GetURI();
355 if(Debug)
356 std::cerr << "Checking: " << uristr << std::endl;
357 if(uristr.substr(0,strlen("mirror://")) != string("mirror://"))
358 continue;
359 // find matching uri in sources.list
360 if(mirror_uri_str.substr(0,uristr.size()) == uristr)
361 {
362 if(Debug)
363 std::cerr << "found BaseURI: " << uristr << std::endl;
364 BaseUri = uristr.substr(0,uristr.size()-1);
365 Dist = (*I)->GetDist();
366 }
367 }
368 // get new file
369 name = _config->FindDir("Dir::State::mirrors") + URItoFileName(BaseUri);
370
371 if(Debug)
372 {
373 cerr << "base-uri: " << BaseUri << endl;
374 cerr << "mirror-file: " << name << endl;
375 }
376 return name;
377 }
378
379 // MirrorMethod::Fetch - Fetch an item /*{{{*/
380 // ---------------------------------------------------------------------
381 /* This adds an item to the pipeline. We keep the pipeline at a fixed
382 depth. */
383 bool MirrorMethod::Fetch(FetchItem *Itm)
384 {
385 if(Debug)
386 clog << "MirrorMethod::Fetch()" << endl;
387
388 // the http method uses Fetch(0) as a way to update the pipeline,
389 // just let it do its work in this case - Fetch() with a valid
390 // Itm will always run before the first Fetch(0)
391 if(Itm == NULL)
392 return HttpMethod::Fetch(Itm);
393
394 // if we don't have the name of the mirror file on disk yet,
395 // calculate it now (can be derived from the uri)
396 if(MirrorFile.empty())
397 MirrorFile = GetMirrorFileName(Itm->Uri);
398
399 // download mirror file once (if we are after index files)
400 if(Itm->IndexFile && !DownloadedMirrorFile)
401 {
402 Clean(_config->FindDir("Dir::State::mirrors"));
403 if (DownloadMirrorFile(Itm->Uri))
404 RandomizeMirrorFile(MirrorFile);
405 }
406
407 if(AllMirrors.empty()) {
408 if(!InitMirrors()) {
409 // no valid mirror selected, something went wrong downloading
410 // from the master mirror site most likely and there is
411 // no old mirror file availalbe
412 return false;
413 }
414 }
415
416 if(Itm->Uri.find("mirror://") != string::npos)
417 Itm->Uri.replace(0,BaseUri.size(), Mirror);
418
419 if(Debug)
420 clog << "Fetch: " << Itm->Uri << endl << endl;
421
422 // now run the real fetcher
423 return HttpMethod::Fetch(Itm);
424 };
425
426 void MirrorMethod::Fail(string Err,bool Transient)
427 {
428 // FIXME: TryNextMirror is not ideal for indexfile as we may
429 // run into auth issues
430
431 if (Debug)
432 clog << "Failure to get " << Queue->Uri << endl;
433
434 // try the next mirror on fail (if its not a expected failure,
435 // e.g. translations are ok to ignore)
436 if (!Queue->FailIgnore && TryNextMirror())
437 return;
438
439 // all mirrors failed, so bail out
440 string s;
441 strprintf(s, _("[Mirror: %s]"), Mirror.c_str());
442 SetIP(s);
443
444 CurrentQueueUriToMirror();
445 pkgAcqMethod::Fail(Err, Transient);
446 }
447
448 void MirrorMethod::URIStart(FetchResult &Res)
449 {
450 CurrentQueueUriToMirror();
451 pkgAcqMethod::URIStart(Res);
452 }
453
454 void MirrorMethod::URIDone(FetchResult &Res,FetchResult *Alt)
455 {
456 CurrentQueueUriToMirror();
457 pkgAcqMethod::URIDone(Res, Alt);
458 }
459
460
461 int main()
462 {
463 setlocale(LC_ALL, "");
464
465 MirrorMethod Mth;
466
467 return Mth.Loop();
468 }
469
470