apt-pkg/acquire-item.h

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: acquire-item.h,v 1.26.2.3 2004/01/02 18:51:00 mdz Exp $
   4 /* ######################################################################
   5
   6    Acquire Item - Item to acquire
   7
   8    When an item is instantiated it will add it self to the local list in
   9    the Owner Acquire class. Derived classes will then call QueueURI to
  10    register all the URI's they wish to fetch at the initial moment.
  11
  12    Three item classes are provided to provide functionality for
  13    downloading of Index, Translation and Packages files.
  14
  15    A Archive class is provided for downloading .deb files. It does Hash
  16    checking and source location as well as a retry algorithm.
  17
  18    ##################################################################### */
  19                                                                         /*}}}*/
  20 #ifndef PKGLIB_ACQUIRE_ITEM_H
  21 #define PKGLIB_ACQUIRE_ITEM_H
  22
  23 #include <apt-pkg/acquire.h>
  24 #include <apt-pkg/indexfile.h>
  25 #include <apt-pkg/vendor.h>
  26 #include <apt-pkg/sourcelist.h>
  27 #include <apt-pkg/pkgrecords.h>
  28 #include <apt-pkg/indexrecords.h>
  29 #include <apt-pkg/hashes.h>
  30 #include <apt-pkg/weakptr.h>
  31
  32 /** \addtogroup acquire
  33  *  @{
  34  *
  35  *  \file acquire-item.h
  36  */
  37
  38 /** \brief Represents the process by which a pkgAcquire object should   {{{
  39  *  retrieve a file or a collection of files.
  40  *
  41  *  By convention, Item subclasses should insert themselves into the
  42  *  acquire queue when they are created by calling QueueURI(), and
  43  *  remove themselves by calling Dequeue() when either Done() or
  44  *  Failed() is invoked.  Item objects are also responsible for
  45  *  notifying the download progress indicator (accessible via
  46  *  #Owner->Log) of their status.
  47  *
  48  *  \see pkgAcquire
  49  */
  50 class pkgAcquire::Item : public WeakPointable
  51 {
  52    protected:
  53
  54    /** \brief The acquire object with which this item is associated. */
  55    pkgAcquire *Owner;
  56
  57    /** \brief Insert this item into its owner's queue.
  58     *
  59     *  \param ItemDesc Metadata about this item (its URI and
  60     *  description).
  61     */
  62    inline void QueueURI(ItemDesc &Item)
  63                  {Owner->Enqueue(Item);};
  64
  65    /** \brief Remove this item from its owner's queue. */
  66    inline void Dequeue() {Owner->Dequeue(this);};
  67
  68    /** \brief Rename a file without modifying its timestamp.
  69     *
  70     *  Many item methods call this as their final action.
  71     *
  72     *  \param From The file to be renamed.
  73     *
  74     *  \param To The new name of #From.  If #To exists it will be
  75     *  overwritten.
  76     */
  77    void Rename(string From,string To);
  78
  79    public:
  80
  81    /** \brief The current status of this item. */
  82    enum ItemState
  83      {
  84        /** \brief The item is waiting to be downloaded. */
  85        StatIdle,
  86
  87        /** \brief The item is currently being downloaded. */
  88        StatFetching,
  89
  90        /** \brief The item has been successfully downloaded. */
  91        StatDone,
  92
  93        /** \brief An error was encountered while downloading this
  94         *  item.
  95         */
  96        StatError,
  97
  98        /** \brief The item was downloaded but its authenticity could
  99         *  not be verified.
 100         */
 101        StatAuthError,
 102
 103        /** \brief The item was could not be downloaded because of
 104         *  a transient network error (e.g. network down)
 105         */
 106        StatTransientNetworkError
 107      } Status;
 108
 109    /** \brief Contains a textual description of the error encountered
 110     *  if #Status is #StatError or #StatAuthError.
 111     */
 112    string ErrorText;
 113
 114    /** \brief The size of the object to fetch. */
 115    unsigned long FileSize;
 116
 117    /** \brief How much of the object was already fetched. */
 118    unsigned long PartialSize;
 119
 120    /** \brief If not \b NULL, contains the name of a subprocess that
 121     *  is operating on this object (for instance, "gzip" or "gpgv").
 122     */
 123    const char *Mode;
 124
 125    /** \brief A client-supplied unique identifier.
 126     *
 127     *  This field is initalized to 0; it is meant to be filled in by
 128     *  clients that wish to use it to uniquely identify items.
 129     *
 130     *  \todo it's unused in apt itself
 131     */
 132    unsigned long ID;
 133
 134    /** \brief If \b true, the entire object has been successfully fetched.
 135     *
 136     *  Subclasses should set this to \b true when appropriate.
 137     */
 138    bool Complete;
 139
 140    /** \brief If \b true, the URI of this object is "local".
 141     *
 142     *  The only effect of this field is to exclude the object from the
 143     *  download progress indicator's overall statistics.
 144     */
 145    bool Local;
 146
 147    /** \brief The number of fetch queues into which this item has been
 148     *  inserted.
 149     *
 150     *  There is one queue for each source from which an item could be
 151     *  downloaded.
 152     *
 153     *  \sa pkgAcquire
 154     */
 155    unsigned int QueueCounter;
 156
 157    /** \brief The name of the file into which the retrieved object
 158     *  will be written.
 159     */
 160    string DestFile;
 161
 162    /** \brief Invoked by the acquire worker when the object couldn't
 163     *  be fetched.
 164     *
 165     *  This is a branch of the continuation of the fetch process.
 166     *
 167     *  \param Message An RFC822-formatted message from the acquire
 168     *  method describing what went wrong.  Use LookupTag() to parse
 169     *  it.
 170     *
 171     *  \param Cnf The method via which the worker tried to fetch this object.
 172     *
 173     *  \sa pkgAcqMethod
 174     */
 175    virtual void Failed(string Message,pkgAcquire::MethodConfig *Cnf);
 176
 177    /** \brief Invoked by the acquire worker when the object was
 178     *  fetched successfully.
 179     *
 180     *  Note that the object might \e not have been written to
 181     *  DestFile; check for the presence of an Alt-Filename entry in
 182     *  Message to find the file to which it was really written.
 183     *
 184     *  Done is often used to switch from one stage of the processing
 185     *  to the next (e.g. fetching, unpacking, copying).  It is one
 186     *  branch of the continuation of the fetch process.
 187     *
 188     *  \param Message Data from the acquire method.  Use LookupTag()
 189     *  to parse it.
 190     *  \param Size The size of the object that was fetched.
 191     *  \param Hash The HashSum of the object that was fetched.
 192     *  \param Cnf The method via which the object was fetched.
 193     *
 194     *  \sa pkgAcqMethod
 195     */
 196    virtual void Done(string Message,unsigned long Size,string Hash,
 197                      pkgAcquire::MethodConfig *Cnf);
 198
 199    /** \brief Invoked when the worker starts to fetch this object.
 200     *
 201     *  \param Message RFC822-formatted data from the worker process.
 202     *  Use LookupTag() to parse it.
 203     *
 204     *  \param Size The size of the object being fetched.
 205     *
 206     *  \sa pkgAcqMethod
 207     */
 208    virtual void Start(string Message,unsigned long Size);
 209
 210    /** \brief Custom headers to be sent to the fetch process.
 211     *
 212     *  \return a string containing RFC822-style headers that are to be
 213     *  inserted into the 600 URI Acquire message sent to the fetch
 214     *  subprocess.  The headers are inserted after a newline-less
 215     *  line, so they should (if nonempty) have a leading newline and
 216     *  no trailing newline.
 217     */
 218    virtual string Custom600Headers() {return string();};
 219
 220    /** \brief A "descriptive" URI-like string.
 221     *
 222     *  \return a URI that should be used to describe what is being fetched.
 223     */
 224    virtual string DescURI() = 0;
 225    /** \brief Short item description.
 226     *
 227     *  \return a brief description of the object being fetched.
 228     */
 229    virtual string ShortDesc() {return DescURI();}
 230
 231    /** \brief Invoked by the worker when the download is completely done. */
 232    virtual void Finished() {};
 233
 234    /** \brief HashSum
 235     *
 236     *  \return the HashSum of this object, if applicable; otherwise, an
 237     *  empty string.
 238     */
 239    virtual string HashSum() {return string();};
 240
 241    /** \return the acquire process with which this item is associated. */
 242    pkgAcquire *GetOwner() {return Owner;};
 243
 244    /** \return \b true if this object is being fetched from a trusted source. */
 245    virtual bool IsTrusted() {return false;};
 246
 247    /** \brief Initialize an item.
 248     *
 249     *  Adds the item to the list of items known to the acquire
 250     *  process, but does not place it into any fetch queues (you must
 251     *  manually invoke QueueURI() to do so).
 252     *
 253     *  Initializes all fields of the item other than Owner to 0,
 254     *  false, or the empty string.
 255     *
 256     *  \param Owner The new owner of this item.
 257     */
 258    Item(pkgAcquire *Owner);
 259
 260    /** \brief Remove this item from its owner's queue by invoking
 261     *  pkgAcquire::Remove.
 262     */
 263    virtual ~Item();
 264 };
 265                                                                         /*}}}*/
 266 /** \brief Information about an index patch (aka diff). */              /*{{{*/
 267 struct DiffInfo {
 268    /** The filename of the diff. */
 269    string file;
 270
 271    /** The sha1 hash of the diff. */
 272    string sha1;
 273
 274    /** The size of the diff. */
 275    unsigned long size;
 276 };
 277                                                                         /*}}}*/
 278 /** \brief An item that is responsible for fetching an index file of    {{{
 279  *  package list diffs and starting the package list's download.
 280  *
 281  *  This item downloads the Index file and parses it, then enqueues
 282  *  additional downloads of either the individual patches (using
 283  *  pkgAcqIndexDiffs) or the entire Packages file (using pkgAcqIndex).
 284  *
 285  *  \sa pkgAcqIndexDiffs, pkgAcqIndex
 286  */
 287 class pkgAcqDiffIndex : public pkgAcquire::Item
 288 {
 289  protected:
 290    /** \brief If \b true, debugging information will be written to std::clog. */
 291    bool Debug;
 292
 293    /** \brief The item that is currently being downloaded. */
 294    pkgAcquire::ItemDesc Desc;
 295
 296    /** \brief The URI of the index file to recreate at our end (either
 297     *  by downloading it or by applying partial patches).
 298     */
 299    string RealURI;
 300
 301    /** \brief The Hash that the real index file should have after
 302     *  all patches have been applied.
 303     */
 304    HashString ExpectedHash;
 305
 306    /** \brief The index file which will be patched to generate the new
 307     *  file.
 308     */
 309    string CurrentPackagesFile;
 310
 311    /** \brief A description of the Packages file (stored in
 312     *  pkgAcquire::ItemDesc::Description).
 313     */
 314    string Description;
 315
 316  public:
 317    // Specialized action members
 318    virtual void Failed(string Message,pkgAcquire::MethodConfig *Cnf);
 319    virtual void Done(string Message,unsigned long Size,string Md5Hash,
 320                      pkgAcquire::MethodConfig *Cnf);
 321    virtual string DescURI() {return RealURI + "Index";};
 322    virtual string Custom600Headers();
 323
 324    /** \brief Parse the Index file for a set of Packages diffs.
 325     *
 326     *  Parses the Index file and creates additional download items as
 327     *  necessary.
 328     *
 329     *  \param IndexDiffFile The name of the Index file.
 330     *
 331     *  \return \b true if the Index file was successfully parsed, \b
 332     *  false otherwise.
 333     */
 334    bool ParseDiffIndex(string IndexDiffFile);
 335
 336
 337    /** \brief Create a new pkgAcqDiffIndex.
 338     *
 339     *  \param Owner The Acquire object that owns this item.
 340     *
 341     *  \param URI The URI of the list file to download.
 342     *
 343     *  \param URIDesc A long description of the list file to download.
 344     *
 345     *  \param ShortDesc A short description of the list file to download.
 346     *
 347     *  \param ExpectedHash The list file's MD5 signature.
 348     */
 349    pkgAcqDiffIndex(pkgAcquire *Owner,string URI,string URIDesc,
 350                    string ShortDesc, HashString ExpectedHash);
 351 };
 352                                                                         /*}}}*/
 353 /** \brief An item that is responsible for fetching all the patches     {{{
 354  *  that need to be applied to a given package index file.
 355  *
 356  *  After downloading and applying a single patch, this item will
 357  *  enqueue a new pkgAcqIndexDiffs to download and apply the remaining
 358  *  patches.  If no patch can be found that applies to an intermediate
 359  *  file or if one of the patches cannot be downloaded, falls back to
 360  *  downloading the entire package index file using pkgAcqIndex.
 361  *
 362  *  \sa pkgAcqDiffIndex, pkgAcqIndex
 363  */
 364 class pkgAcqIndexDiffs : public pkgAcquire::Item
 365 {
 366    private:
 367
 368    /** \brief Queue up the next diff download.
 369     *
 370     *  Search for the next available diff that applies to the file
 371     *  that currently exists on disk, and enqueue it by calling
 372     *  QueueURI().
 373     *
 374     *  \return \b true if an applicable diff was found, \b false
 375     *  otherwise.
 376     */
 377    bool QueueNextDiff();
 378
 379    /** \brief Handle tasks that must be performed after the item
 380     *  finishes downloading.
 381     *
 382     *  Dequeues the item and checks the resulting file's md5sum
 383     *  against ExpectedHash after the last patch was applied.
 384     *  There is no need to check the md5/sha1 after a "normal"
 385     *  patch because QueueNextDiff() will check the sha1 later.
 386     *
 387     *  \param allDone If \b true, the file was entirely reconstructed,
 388     *  and its md5sum is verified.
 389     */
 390    void Finish(bool allDone=false);
 391
 392    protected:
 393
 394    /** \brief If \b true, debugging output will be written to
 395     *  std::clog.
 396     */
 397    bool Debug;
 398
 399    /** \brief A description of the item that is currently being
 400     *  downloaded.
 401     */
 402    pkgAcquire::ItemDesc Desc;
 403
 404    /** \brief The URI of the package index file that is being
 405     *  reconstructed.
 406     */
 407    string RealURI;
 408
 409    /** \brief The HashSum of the package index file that is being
 410     *  reconstructed.
 411     */
 412    HashString ExpectedHash;
 413
 414    /** A description of the file being downloaded. */
 415    string Description;
 416
 417    /** The patches that remain to be downloaded, including the patch
 418     *  being downloaded right now.  This list should be ordered so
 419     *  that each diff appears before any diff that depends on it.
 420     *
 421     *  \todo These are indexed by sha1sum; why not use some sort of
 422     *  dictionary instead of relying on ordering and stripping them
 423     *  off the front?
 424     */
 425    vector<DiffInfo> available_patches;
 426
 427    /** Stop applying patches when reaching that sha1 */
 428    string ServerSha1;
 429
 430    /** The current status of this patch. */
 431    enum DiffState
 432      {
 433         /** \brief The diff is in an unknown state. */
 434          StateFetchUnkown,
 435
 436          /** \brief The diff is currently being fetched. */
 437          StateFetchDiff,
 438
 439          /** \brief The diff is currently being uncompressed. */
 440          StateUnzipDiff,
 441
 442          /** \brief The diff is currently being applied. */
 443          StateApplyDiff
 444    } State;
 445
 446    public:
 447
 448    /** \brief Called when the patch file failed to be downloaded.
 449     *
 450     *  This method will fall back to downloading the whole index file
 451     *  outright; its arguments are ignored.
 452     */
 453    virtual void Failed(string Message,pkgAcquire::MethodConfig *Cnf);
 454
 455    virtual void Done(string Message,unsigned long Size,string Md5Hash,
 456                      pkgAcquire::MethodConfig *Cnf);
 457    virtual string DescURI() {return RealURI + "Index";};
 458
 459    /** \brief Create an index diff item.
 460     *
 461     *  After filling in its basic fields, this invokes Finish(true) if
 462     *  #diffs is empty, or QueueNextDiff() otherwise.
 463     *
 464     *  \param Owner The pkgAcquire object that owns this item.
 465     *
 466     *  \param URI The URI of the package index file being
 467     *  reconstructed.
 468     *
 469     *  \param URIDesc A long description of this item.
 470     *
 471     *  \param ShortDesc A brief description of this item.
 472     *
 473     *  \param ExpectedHash The expected md5sum of the completely
 474     *  reconstructed package index file; the index file will be tested
 475     *  against this value when it is entirely reconstructed.
 476     *
 477     *  \param diffs The remaining diffs from the index of diffs.  They
 478     *  should be ordered so that each diff appears before any diff
 479     *  that depends on it.
 480     */
 481    pkgAcqIndexDiffs(pkgAcquire *Owner,string URI,string URIDesc,
 482                     string ShortDesc, HashString ExpectedHash,
 483                     string ServerSha1,
 484                     vector<DiffInfo> diffs=vector<DiffInfo>());
 485 };
 486                                                                         /*}}}*/
 487 /** \brief An acquire item that is responsible for fetching an index    {{{
 488  *  file (e.g., Packages or Sources).
 489  *
 490  *  \sa pkgAcqDiffIndex, pkgAcqIndexDiffs, pkgAcqIndexTrans
 491  *
 492  *  \todo Why does pkgAcqIndex have protected members?
 493  */
 494 class pkgAcqIndex : public pkgAcquire::Item
 495 {
 496    protected:
 497
 498    /** \brief If \b true, the index file has been decompressed. */
 499    bool Decompression;
 500
 501    /** \brief If \b true, the partially downloaded file will be
 502     *  removed when the download completes.
 503     */
 504    bool Erase;
 505
 506    /** \brief The download request that is currently being
 507     *   processed.
 508     */
 509    pkgAcquire::ItemDesc Desc;
 510
 511    /** \brief The object that is actually being fetched (minus any
 512     *  compression-related extensions).
 513     */
 514    string RealURI;
 515
 516    /** \brief The expected hashsum of the decompressed index file. */
 517    HashString ExpectedHash;
 518
 519    /** \brief The compression-related file extension that is being
 520     *  added to the downloaded file (e.g., ".gz" or ".bz2").
 521     */
 522    string CompressionExtension;
 523
 524    public:
 525
 526    // Specialized action members
 527    virtual void Failed(string Message,pkgAcquire::MethodConfig *Cnf);
 528    virtual void Done(string Message,unsigned long Size,string Md5Hash,
 529                      pkgAcquire::MethodConfig *Cnf);
 530    virtual string Custom600Headers();
 531    virtual string DescURI() {return RealURI + CompressionExtension;};
 532    virtual string HashSum() {return ExpectedHash.toStr(); };
 533
 534    /** \brief Create a pkgAcqIndex.
 535     *
 536     *  \param Owner The pkgAcquire object with which this item is
 537     *  associated.
 538     *
 539     *  \param URI The URI of the index file that is to be downloaded.
 540     *
 541     *  \param URIDesc A "URI-style" description of this index file.
 542     *
 543     *  \param ShortDesc A brief description of this index file.
 544     *
 545     *  \param ExpectedHash The expected hashsum of this index file.
 546     *
 547     *  \param compressExt The compression-related extension with which
 548     *  this index file should be downloaded, or "" to autodetect
 549     *  Compression types can be set with config Acquire::CompressionTypes,
 550     *  default is ".lzma" or ".bz2" (if the needed binaries are present)
 551     *  fallback is ".gz" or none.
 552     */
 553    pkgAcqIndex(pkgAcquire *Owner,string URI,string URIDesc,
 554                string ShortDesc, HashString ExpectedHash, string compressExt="");
 555 };
 556                                                                         /*}}}*/
 557 /** \brief An acquire item that is responsible for fetching a           {{{
 558  *  translated index file.
 559  *
 560  *  The only difference from pkgAcqIndex is that transient failures
 561  *  are suppressed: no error occurs if the translated index file is
 562  *  missing.
 563  */
 564 class pkgAcqIndexTrans : public pkgAcqIndex
 565 {
 566    public:
 567
 568    virtual void Failed(string Message,pkgAcquire::MethodConfig *Cnf);
 569
 570    /** \brief Create a pkgAcqIndexTrans.
 571     *
 572     *  \param Owner The pkgAcquire object with which this item is
 573     *  associated.
 574     *
 575     *  \param URI The URI of the index file that is to be downloaded.
 576     *
 577     *  \param URIDesc A "URI-style" description of this index file.
 578     *
 579     *  \param ShortDesc A brief description of this index file.
 580     */
 581    pkgAcqIndexTrans(pkgAcquire *Owner,string URI,string URIDesc,
 582                     string ShortDesc);
 583 };
 584                                                                         /*}}}*/
 585 /** \brief Information about an index file. */                          /*{{{*/
 586 struct IndexTarget
 587 {
 588    /** \brief A URI from which the index file can be downloaded. */
 589    string URI;
 590
 591    /** \brief A description of the index file. */
 592    string Description;
 593
 594    /** \brief A shorter description of the index file. */
 595    string ShortDesc;
 596
 597    /** \brief The key by which this index file should be
 598     *  looked up within the meta signature file.
 599     */
 600    string MetaKey;
 601 };
 602                                                                         /*}}}*/
 603 /** \brief An acquire item that downloads the detached signature        {{{
 604  *  of a meta-index (Release) file, then queues up the release
 605  *  file itself.
 606  *
 607  *  \todo Why protected members?
 608  *
 609  *  \sa pkgAcqMetaIndex
 610  */
 611 class pkgAcqMetaSig : public pkgAcquire::Item
 612 {
 613    protected:
 614    /** \brief The last good signature file */
 615    string LastGoodSig;
 616
 617
 618    /** \brief The fetch request that is currently being processed. */
 619    pkgAcquire::ItemDesc Desc;
 620
 621    /** \brief The URI of the signature file.  Unlike Desc.URI, this is
 622     *  never modified; it is used to determine the file that is being
 623     *  downloaded.
 624     */
 625    string RealURI;
 626
 627    /** \brief The URI of the meta-index file to be fetched after the signature. */
 628    string MetaIndexURI;
 629
 630    /** \brief A "URI-style" description of the meta-index file to be
 631     *  fetched after the signature.
 632     */
 633    string MetaIndexURIDesc;
 634
 635    /** \brief A brief description of the meta-index file to be fetched
 636     *  after the signature.
 637     */
 638    string MetaIndexShortDesc;
 639
 640    /** \brief A package-system-specific parser for the meta-index file. */
 641    indexRecords* MetaIndexParser;
 642
 643    /** \brief The index files which should be looked up in the meta-index
 644     *  and then downloaded.
 645     *
 646     *  \todo Why a list of pointers instead of a list of structs?
 647     */
 648    const vector<struct IndexTarget*>* IndexTargets;
 649
 650    public:
 651
 652    // Specialized action members
 653    virtual void Failed(string Message,pkgAcquire::MethodConfig *Cnf);
 654    virtual void Done(string Message,unsigned long Size,string Md5Hash,
 655                      pkgAcquire::MethodConfig *Cnf);
 656    virtual string Custom600Headers();
 657    virtual string DescURI() {return RealURI; };
 658
 659    /** \brief Create a new pkgAcqMetaSig. */
 660    pkgAcqMetaSig(pkgAcquire *Owner,string URI,string URIDesc, string ShortDesc,
 661                  string MetaIndexURI, string MetaIndexURIDesc, string MetaIndexShortDesc,
 662                  const vector<struct IndexTarget*>* IndexTargets,
 663                  indexRecords* MetaIndexParser);
 664 };
 665                                                                         /*}}}*/
 666 /** \brief An item that is responsible for downloading the meta-index   {{{
 667  *  file (i.e., Release) itself and verifying its signature.
 668  *
 669  *  Once the download and verification are complete, the downloads of
 670  *  the individual index files are queued up using pkgAcqDiffIndex.
 671  *  If the meta-index file had a valid signature, the expected hashsums
 672  *  of the index files will be the md5sums listed in the meta-index;
 673  *  otherwise, the expected hashsums will be "" (causing the
 674  *  authentication of the index files to be bypassed).
 675  */
 676 class pkgAcqMetaIndex : public pkgAcquire::Item
 677 {
 678    protected:
 679    /** \brief The fetch command that is currently being processed. */
 680    pkgAcquire::ItemDesc Desc;
 681
 682    /** \brief The URI that is actually being downloaded; never
 683     *  modified by pkgAcqMetaIndex.
 684     */
 685    string RealURI;
 686
 687    /** \brief The file in which the signature for this index was stored.
 688     *
 689     *  If empty, the signature and the md5sums of the individual
 690     *  indices will not be checked.
 691     */
 692    string SigFile;
 693
 694    /** \brief The index files to download. */
 695    const vector<struct IndexTarget*>* IndexTargets;
 696
 697    /** \brief The parser for the meta-index file. */
 698    indexRecords* MetaIndexParser;
 699
 700    /** \brief If \b true, the index's signature is currently being verified.
 701     */
 702    bool AuthPass;
 703    // required to deal gracefully with problems caused by incorrect ims hits
 704    bool IMSHit;
 705
 706    /** \brief Check that the release file is a release file for the
 707     *  correct distribution.
 708     *
 709     *  \return \b true if no fatal errors were encountered.
 710     */
 711    bool VerifyVendor(string Message);
 712
 713    /** \brief Called when a file is finished being retrieved.
 714     *
 715     *  If the file was not downloaded to DestFile, a copy process is
 716     *  set up to copy it to DestFile; otherwise, Complete is set to \b
 717     *  true and the file is moved to its final location.
 718     *
 719     *  \param Message The message block received from the fetch
 720     *  subprocess.
 721     */
 722    void RetrievalDone(string Message);
 723
 724    /** \brief Called when authentication succeeded.
 725     *
 726     *  Sanity-checks the authenticated file, queues up the individual
 727     *  index files for download, and saves the signature in the lists
 728     *  directory next to the authenticated list file.
 729     *
 730     *  \param Message The message block received from the fetch
 731     *  subprocess.
 732     */
 733    void AuthDone(string Message);
 734
 735    /** \brief Starts downloading the individual index files.
 736     *
 737     *  \param verify If \b true, only indices whose expected hashsum
 738     *  can be determined from the meta-index will be downloaded, and
 739     *  the hashsums of indices will be checked (reporting
 740     *  #StatAuthError if there is a mismatch).  If verify is \b false,
 741     *  no hashsum checking will be performed.
 742     */
 743    void QueueIndexes(bool verify);
 744
 745    public:
 746
 747    // Specialized action members
 748    virtual void Failed(string Message,pkgAcquire::MethodConfig *Cnf);
 749    virtual void Done(string Message,unsigned long Size, string Hash,
 750                      pkgAcquire::MethodConfig *Cnf);
 751    virtual string Custom600Headers();
 752    virtual string DescURI() {return RealURI; };
 753
 754    /** \brief Create a new pkgAcqMetaIndex. */
 755    pkgAcqMetaIndex(pkgAcquire *Owner,
 756                    string URI,string URIDesc, string ShortDesc,
 757                    string SigFile,
 758                    const vector<struct IndexTarget*>* IndexTargets,
 759                    indexRecords* MetaIndexParser);
 760 };
 761                                                                         /*}}}*/
 762 /** \brief An item that is responsible for fetching a package file.     {{{
 763  *
 764  *  If the package file already exists in the cache, nothing will be
 765  *  done.
 766  */
 767 class pkgAcqArchive : public pkgAcquire::Item
 768 {
 769    protected:
 770    /** \brief The package version being fetched. */
 771    pkgCache::VerIterator Version;
 772
 773    /** \brief The fetch command that is currently being processed. */
 774    pkgAcquire::ItemDesc Desc;
 775
 776    /** \brief The list of sources from which to pick archives to
 777     *  download this package from.
 778     */
 779    pkgSourceList *Sources;
 780
 781    /** \brief A package records object, used to look up the file
 782     *  corresponding to each version of the package.
 783     */
 784    pkgRecords *Recs;
 785
 786    /** \brief The hashsum of this package. */
 787    HashString ExpectedHash;
 788
 789    /** \brief A location in which the actual filename of the package
 790     *  should be stored.
 791     */
 792    string &StoreFilename;
 793
 794    /** \brief The next file for this version to try to download. */
 795    pkgCache::VerFileIterator Vf;
 796
 797    /** \brief How many (more) times to try to find a new source from
 798     *  which to download this package version if it fails.
 799     *
 800     *  Set from Acquire::Retries.
 801     */
 802    unsigned int Retries;
 803
 804    /** \brief \b true if this version file is being downloaded from a
 805     *  trusted source.
 806     */
 807    bool Trusted;
 808
 809    /** \brief Queue up the next available file for this version. */
 810    bool QueueNext();
 811
 812    public:
 813
 814    virtual void Failed(string Message,pkgAcquire::MethodConfig *Cnf);
 815    virtual void Done(string Message,unsigned long Size,string Hash,
 816                      pkgAcquire::MethodConfig *Cnf);
 817    virtual string DescURI() {return Desc.URI;};
 818    virtual string ShortDesc() {return Desc.ShortDesc;};
 819    virtual void Finished();
 820    virtual string HashSum() {return ExpectedHash.toStr(); };
 821    virtual bool IsTrusted();
 822
 823    /** \brief Create a new pkgAcqArchive.
 824     *
 825     *  \param Owner The pkgAcquire object with which this item is
 826     *  associated.
 827     *
 828     *  \param Sources The sources from which to download version
 829     *  files.
 830     *
 831     *  \param Recs A package records object, used to look up the file
 832     *  corresponding to each version of the package.
 833     *
 834     *  \param Version The package version to download.
 835     *
 836     *  \param StoreFilename A location in which the actual filename of
 837     *  the package should be stored.  It will be set to a guessed
 838     *  basename in the constructor, and filled in with a fully
 839     *  qualified filename once the download finishes.
 840     */
 841    pkgAcqArchive(pkgAcquire *Owner,pkgSourceList *Sources,
 842                  pkgRecords *Recs,pkgCache::VerIterator const &Version,
 843                  string &StoreFilename);
 844 };
 845                                                                         /*}}}*/
 846 /** \brief Retrieve an arbitrary file to the current directory.         {{{
 847  *
 848  *  The file is retrieved even if it is accessed via a URL type that
 849  *  normally is a NOP, such as "file".  If the download fails, the
 850  *  partial file is renamed to get a ".FAILED" extension.
 851  */
 852 class pkgAcqFile : public pkgAcquire::Item
 853 {
 854    /** \brief The currently active download process. */
 855    pkgAcquire::ItemDesc Desc;
 856
 857    /** \brief The hashsum of the file to download, if it is known. */
 858    HashString ExpectedHash;
 859
 860    /** \brief How many times to retry the download, set from
 861     *  Acquire::Retries.
 862     */
 863    unsigned int Retries;
 864
 865    /** \brief Should this file be considered a index file */
 866    bool IsIndexFile;
 867
 868    public:
 869
 870    // Specialized action members
 871    virtual void Failed(string Message,pkgAcquire::MethodConfig *Cnf);
 872    virtual void Done(string Message,unsigned long Size,string CalcHash,
 873                      pkgAcquire::MethodConfig *Cnf);
 874    virtual string DescURI() {return Desc.URI;};
 875    virtual string HashSum() {return ExpectedHash.toStr(); };
 876    virtual string Custom600Headers();
 877
 878    /** \brief Create a new pkgAcqFile object.
 879     *
 880     *  \param Owner The pkgAcquire object with which this object is
 881     *  associated.
 882     *
 883     *  \param URI The URI to download.
 884     *
 885     *  \param Hash The hashsum of the file to download, if it is known;
 886     *  otherwise "".
 887     *
 888     *  \param Size The size of the file to download, if it is known;
 889     *  otherwise 0.
 890     *
 891     *  \param Desc A description of the file being downloaded.
 892     *
 893     *  \param ShortDesc A brief description of the file being
 894     *  downloaded.
 895     *
 896     *  \param DestDir The directory the file should be downloaded into.
 897     *
 898     *  \param DestFilename The filename+path the file is downloaded to.
 899     *
 900     *  \param IsIndexFile The file is considered a IndexFile and cache-control
 901     *                     headers like "cache-control: max-age=0" are send
 902     *
 903     * If DestFilename is empty, download to DestDir/<basename> if
 904     * DestDir is non-empty, $CWD/<basename> otherwise.  If
 905     * DestFilename is NOT empty, DestDir is ignored and DestFilename
 906     * is the absolute name to which the file should be downloaded.
 907     */
 908
 909    pkgAcqFile(pkgAcquire *Owner, string URI, string Hash, unsigned long Size,
 910               string Desc, string ShortDesc,
 911               const string &DestDir="", const string &DestFilename="",
 912               bool IsIndexFile=false);
 913 };
 914                                                                         /*}}}*/
 915 /** @} */
 916
 917 #endif