6 * Written by Keith Marshall <keithmarshall@users.sourceforge.net>
7 * Copyright (C) 2009, 2010, MinGW Project
10 * Implementation of the package download machinery for mingw-get.
13 * This is free software. Permission is granted to copy, modify and
14 * redistribute this software, under the provisions of the GNU General
15 * Public License, Version 3, (or, at your option, any later version),
16 * as published by the Free Software Foundation; see the file COPYING
17 * for licensing details.
19 * Note, in particular, that this software is provided "as is", in the
20 * hope that it may prove useful, but WITHOUT WARRANTY OF ANY KIND; not
21 * even an implied WARRANTY OF MERCHANTABILITY, nor of FITNESS FOR ANY
22 * PARTICULAR PURPOSE. Under no circumstances will the author, or the
23 * MinGW Project, accept liability for any damages, however caused,
24 * arising from the use of this software.
27 #define WIN32_LEAN_AND_MEAN
42 class pkgInternetAgent
44 /* A minimal, locally implemented class, instantiated ONCE as a
45 * global object, to ensure that wininet's global initialisation is
46 * completed at the proper time, without us doing it explicitly.
49 HINTERNET SessionHandle;
52 inline pkgInternetAgent():SessionHandle( NULL )
56 if( InternetAttemptConnect( 0 ) == ERROR_SUCCESS )
57 SessionHandle = InternetOpen
58 ( "MinGW Installer", INTERNET_OPEN_TYPE_PRECONFIG,
62 inline ~pkgInternetAgent()
66 if( SessionHandle != NULL )
67 Close( SessionHandle );
70 /* Remaining methods are simple inline wrappers for the
71 * wininet functions we plan to use...
73 inline HINTERNET OpenURL( const char *URL )
75 return InternetOpenUrl( SessionHandle, URL, NULL, 0, 0, 0 );
77 inline DWORD QueryStatus( HINTERNET id )
79 DWORD ok, idx = 0, len = sizeof( ok );
80 if( HttpQueryInfo( id, HTTP_QUERY_FLAG_NUMBER | HTTP_QUERY_STATUS_CODE, &ok, &len, &idx ) )
84 inline int Read( HINTERNET dl, char *buf, size_t max, DWORD *count )
86 return InternetReadFile( dl, buf, max, count );
88 inline int Close( HINTERNET id )
90 return InternetCloseHandle( id );
94 /* This is the one and only instantiation of an object of this class.
96 static pkgInternetAgent pkgDownloadAgent;
98 class pkgInternetStreamingAgent
100 /* Another locally implemented class; each individual file download
101 * gets its own instance of this, either as-is for basic data transfer,
102 * or as a specialised derivative of this base class.
105 const char *filename;
106 const char *dest_template;
113 virtual int TransferData( int );
116 pkgInternetStreamingAgent( const char*, const char* );
117 virtual ~pkgInternetStreamingAgent();
119 virtual int Get( const char* );
120 inline const char *DestFile(){ return dest_file; }
123 pkgInternetStreamingAgent::pkgInternetStreamingAgent
124 ( const char *local_name, const char *dest_specification )
126 /* Constructor for the pkgInternetStreamingAgent class.
128 filename = local_name;
129 dest_template = dest_specification;
130 dest_file = (char *)(malloc( mkpath( NULL, dest_template, filename, NULL ) ));
131 if( dest_file != NULL )
132 mkpath( dest_file, dest_template, filename, NULL );
135 pkgInternetStreamingAgent::~pkgInternetStreamingAgent()
137 /* Destructor needs to free the heap memory allocated by the
138 * constructor, for storage of "dest_file" name.
140 free( (void *)(dest_file) );
143 int pkgInternetStreamingAgent::TransferData( int fd )
145 /* In the case of this base class implementation,
146 * we simply read the file's data from the Internet source,
147 * and write a verbatim copy to the destination file.
149 char buf[8192]; DWORD count, tally = 0;
150 do { dl_status = pkgDownloadAgent.Read( dl_host, buf, sizeof( buf ), &count );
151 dmh_printf( "\rdownloading: %s: %I32d b", filename, tally += count );
152 write( fd, buf, count );
153 } while( dl_status && (count > 0) );
154 dmh_printf( "\rdownloading: %s: %I32d b\n", filename, tally );
158 static const char *get_host_info
159 ( pkgXmlNode *ref, const char *property, const char *fallback = NULL )
161 /* Helper function to retrieve host information from the XML catalogue.
163 * Call with property = "url", to retrieve the URL template to pass as
164 * "fmt" argument to mkpath(), or with property = "mirror", to retrieve
165 * the substitution text for the "modifier" argument.
167 const char *uri = NULL;
170 /* Starting from the "ref" package entry in the catalogue...
172 pkgXmlNode *host = ref->FindFirstAssociate( download_host_key );
173 while( host != NULL )
175 /* Examine its associate tags; if we find one of type
176 * "download-host", with the requisite property, then we
177 * immediately return that property value...
179 if( (uri = host->GetPropVal( property, NULL )) != NULL )
182 /* Otherwise, we look for any other candidate tags
183 * associated with the same catalogue entry...
185 host = host->FindNextAssociate( download_host_key );
187 /* Failing an immediate match, extend the search to the
188 * ancestors of the initial reference entry...
190 ref = ref->GetParent();
192 /* ...and ultimately, if no match is found, we return the
193 * specified "fallback" property value.
199 int set_transit_path( const char *path, const char *file, char *buf = NULL )
201 /* Helper to define the transitional path name for downloaded files,
202 * used to save the file data while the download is in progress.
204 static const char *transit_dir = "/.in-transit";
205 return mkpath( buf, path, file, transit_dir );
208 int pkgInternetStreamingAgent::Get( const char *from_url )
210 /* Download a file from the specified internet URL.
212 * Before download commences, we accept that this may fail...
216 /* Set up a "transit-file" to receive the downloaded content.
218 char transit_file[set_transit_path( dest_template, filename )];
219 int fd; set_transit_path( dest_template, filename, transit_file );
221 if( (fd = set_output_stream( transit_file, 0644 )) >= 0 )
223 /* The "transit-file" is ready to receive incoming data...
224 * Configure and invoke the download handler to copy the data
225 * from the appropriate host URL, to this "transit-file".
227 if( (dl_host = pkgDownloadAgent.OpenURL( from_url )) != NULL )
229 if( pkgDownloadAgent.QueryStatus( dl_host ) == HTTP_STATUS_OK )
231 /* With the download transaction fully specified, we may
232 * request processing of the file transfer...
234 dl_status = TransferData( fd );
237 /* We are done with the URL handle; close it.
239 pkgDownloadAgent.Close( dl_host );
242 /* Always close the "transit-file", whether the download
243 * was successful, or not...
248 * When successful, we move the "transit-file" to its
249 * final downloaded location...
251 rename( transit_file, dest_file );
253 /* ...otherwise, we discard the incomplete "transit-file",
254 * leaving the caller to diagnose the failure.
256 unlink( transit_file );
259 /* Report success or failure to the caller...
264 void pkgActionItem::DownloadArchiveFiles( pkgActionItem *current )
266 /* Update the local package cache, to ensure that all packages needed
267 * to complete the current set of scheduled actions are present; if any
268 * are missing, invoke an Internet download agent to fetch them. This
269 * requires us to walk the action list...
271 while( current != NULL )
273 /* ...while we haven't run off the end...
275 if( (current->flags & ACTION_INSTALL) == ACTION_INSTALL )
277 /* For all packages specified in the current action list,
278 * for which an "install" action is scheduled, and for which
279 * no associated archive file is present in the local archive
280 * cache, place an Internet download agent on standby to fetch
281 * the required archive from a suitable internet mirror host.
283 const char *package_name = current->Selection()->ArchiveName();
284 pkgInternetStreamingAgent download( package_name, pkgArchivePath() );
286 /* Check if the required archive is already available locally...
288 if( (access( download.DestFile(), R_OK ) != 0) && (errno == ENOENT) )
290 /* ...if not, ask the download agent to fetch it...
292 const char *url_template = get_host_info( current->Selection(), uri_key );
293 if( url_template != NULL )
295 /* ...from the URL constructed from the template specified in
296 * the package repository catalogue (configuration database)...
298 const char *mirror = get_host_info( current->Selection(), mirror_key );
299 char package_url[mkpath( NULL, url_template, package_name, mirror )];
300 mkpath( package_url, url_template, package_name, mirror );
301 if( ! (download.Get( package_url ) > 0) )
302 dmh_notify( DMH_ERROR,
303 "Get package: %s: download failed\n", package_url
307 /* Cannot download; the repository catalogue didn't specify a
308 * template, from which to construct a download URL...
310 dmh_notify( DMH_ERROR,
311 "Get package: %s: no URL specified for download\n", package_name
315 /* Repeat download action, for any additional packages specified
316 * in the current "actions" list.
318 current = current->next;
322 #define DATA_CACHE_PATH "%R" "var/cache/mingw-get/data"
323 #define WORKING_DATA_PATH "%R" "var/lib/mingw-get/data"
325 /* Internet servers host package catalogues in lzma compressed format;
326 * we will decompress them "on the fly", as we download them. To achieve
327 * this, we will use a variant of the pkgInternetStreamingAgent, using a
328 * specialised TransferData method; additionally, this will incorporate
329 * a special derivative of a pkgLzmaArchiveStream, with its GetRawData
330 * method adapted to stream data from an internet URI, instead of
331 * reading from a local file.
333 * To derive the pkgInternetLzmaStreamingAgent, we need to include the
334 * specialised declarations of a pkgArchiveStream, in order to make the
335 * declaration of pkgLzmaArchiveStream available as our base class.
337 #define PKGSTRM_H_SPECIAL 1
340 class pkgInternetLzmaStreamingAgent :
341 public pkgInternetStreamingAgent, public pkgLzmaArchiveStream
343 /* Specialisation of the pkgInternetStreamingAgent base class,
344 * providing decompressed copies of LZMA encoded files downloaded
345 * from the Internet; (the LZMA decompression capability is derived
346 * from the pkgLzmaArchiveStream base class).
349 /* We need a specialised constructor...
351 pkgInternetLzmaStreamingAgent( const char*, const char* );
354 /* Specialisation requires overrides for each of this pair of
355 * methods, (the first from the pkgLzmaArchiveStream base class;
356 * the second from pkgInternetStreamingAgent).
358 virtual int GetRawData( int, uint8_t*, size_t );
359 virtual int TransferData( int );
362 /* This specialisation of the pkgInternetStreamingAgent class needs its
363 * own constructor, simply to invoke the constructors for the base classes,
364 * (since neither is instantiated by a default constructor).
366 pkgInternetLzmaStreamingAgent::pkgInternetLzmaStreamingAgent
367 ( const char *local_name, const char *dest_specification ):
368 pkgInternetStreamingAgent( local_name, dest_specification ),
370 * Note that, when we come to initialise the lzma streaming component
371 * of this derived class, we will be streaming directly from the internet,
372 * rather than from a file stream, so we don't require a file descriptor
373 * for the input stream; however, the class semantics still expect one.
374 * To avoid accidental association with an existing file stream, we
375 * use a negative value, (which is never a valid file descriptor);
376 * however, we must not choose -1, since the class implementation
377 * will decline to process the stream; hence, we choose -2.
379 pkgLzmaArchiveStream( -2 ){}
381 int pkgInternetLzmaStreamingAgent::GetRawData( int fd, uint8_t *buf, size_t max )
383 /* Fetch raw (compressed) data from the Internet host, and load it into
384 * the decompression filter's input buffer, whence the TransferData routine
385 * may retrieve it, via the filter, as an uncompressed stream.
388 dl_status = pkgDownloadAgent.Read( dl_host, (char *)(buf), max, &count );
392 int pkgInternetLzmaStreamingAgent::TransferData( int fd )
394 /* In this case, we read the file's data from the Internet source,
395 * stream it through the lzma decompression filter, and write a copy
396 * of the resultant decompressed data to the destination file.
398 char buf[8192]; DWORD count;
399 do { count = pkgLzmaArchiveStream::Read( buf, sizeof( buf ) );
400 write( fd, buf, count );
401 } while( dl_status && (count > 0) );
405 static const char *serial_number( const char *catalogue )
407 /* Local helper function to retrieve issue numbers from any repository
408 * package catalogue; returns the result as a duplicate of the internal
409 * string, allocated on the heap (courtesy of the strdup() function).
412 pkgXmlDocument src( catalogue );
415 && ((issue = src.GetRoot()->GetPropVal( issue_key, NULL )) != NULL) )
417 * Found an issue number; return a copy...
419 return strdup( issue );
421 /* If we get to here, we couldn't get a valid issue number;
422 * whatever the reason, return NULL to indicate failure.
427 void pkgXmlDocument::SyncRepository( const char *name, pkgXmlNode *repository )
429 /* Fetch a named package catalogue from a specified Internet repository.
431 * Package catalogues are XML files; the master copy on the Internet host
432 * must be stored in lzma compressed format, and named to comply with the
433 * convention "%F.xml.lzma", in which "%F" represents the value of the
434 * "name" argument passed to this pkgXmlDocument class method.
436 const char *url_template;
437 if( (url_template = repository->GetPropVal( uri_key, NULL )) != NULL )
439 /* Initialise a streaming agent, to manage the catalogue download;
440 * (note that we must include the "%/M" placeholder in the template
441 * for the local name, to accommodate the name of the intermediate
442 * "in-transit" directory used by the streaming agent).
444 pkgInternetLzmaStreamingAgent download( name, DATA_CACHE_PATH "%/M/%F.xml" );
446 /* Construct the full URI for the master catalogue, and stream it to
447 * a locally cached, decompressed copy of the XML file.
449 const char *mirror = repository->GetPropVal( mirror_key, NULL );
450 char catalogue_url[mkpath( NULL, url_template, name, mirror )];
451 mkpath( catalogue_url, url_template, name, mirror );
452 if( download.Get( catalogue_url ) <= 0 )
453 dmh_notify( DMH_ERROR,
454 "Sync Repository: %s: download failed\n", catalogue_url
458 /* We will only replace our current working copy of this catalogue,
459 * (if one already exists), with the copy we just downloaded, if this
460 * downloaded copy bears an issue number indicating that it is more
461 * recent than the working copy.
463 const char *repository_version, *working_version;
464 if( (repository_version = serial_number( download.DestFile() )) != NULL )
466 /* Identify the location for the working copy, (if it exists).
468 const char *working_copy_path_name = WORKING_DATA_PATH "/%F.xml";
469 char working_copy[mkpath( NULL, working_copy_path_name, name, NULL )];
470 mkpath( working_copy, working_copy_path_name, name, NULL );
472 /* Compare issue serial numbers...
474 if( ((working_version = serial_number( working_copy )) == NULL)
475 || ((strcmp( repository_version, working_version )) > 0) )
477 /* In these circumstances, we couldn't identify an issue number
478 * for the working copy of the catalogue; (maybe there is no such
479 * catalogue, or maybe it doesn't specify a valid issue number);
480 * in either case, we promote the downloaded copy in its place.
482 * FIXME: we assume that the working file and the downloaded copy
483 * are stored on the same physical file system device, so we may
484 * replace the former by simply deleting it, and renaming the
485 * latter with its original path name; we make no provision for
486 * replacing the working version by physical data copying.
488 unlink( working_copy );
489 rename( download.DestFile(), working_copy );
492 /* The issue numbers, returned by the serial_number() function, were
493 * allocated on the heap; free them to avoid leaking memory!
495 free( (void *)(repository_version) );
497 * The working copy issue number may be represented by a NULL pointer;
498 * while it may be safe to call free on this, it just *seems* wrong, so
499 * we check it first, to be certain.
501 if( working_version != NULL )
502 free( (void *)(working_version) );
505 /* If the downloaded copy of the catalogue is still in the download cache,
506 * we have chosen to keep a previous working copy, so we have no further
507 * use for the downloaded copy; discard it, noting that we don't need to
508 * confirm its existence because this will fail silently, if it is no
511 unlink( download.DestFile() );
515 /* $RCSfile$: end of file */