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Diffstat (limited to 'apt-pkg/acquire-item.h')
| -rw-r--r-- | apt-pkg/acquire-item.h | 1214 |
1 files changed, 1214 insertions, 0 deletions
diff --git a/apt-pkg/acquire-item.h b/apt-pkg/acquire-item.h new file mode 100644 index 0000000..3be8a9c --- /dev/null +++ b/apt-pkg/acquire-item.h @@ -0,0 +1,1214 @@ +// -*- mode: cpp; mode: fold -*- +// Description /*{{{*/ +/* ###################################################################### + + Acquire Item - Item to acquire + + When an item is instantiated it will add it self to the local list in + the Owner Acquire class. Derived classes will then call QueueURI to + register all the URI's they wish to fetch at the initial moment. + + Three item classes are provided to provide functionality for + downloading of Index, Translation and Packages files. + + A Archive class is provided for downloading .deb files. It does Hash + checking and source location as well as a retry algorithm. + + ##################################################################### */ + /*}}}*/ +#ifndef PKGLIB_ACQUIRE_ITEM_H +#define PKGLIB_ACQUIRE_ITEM_H + +#include <apt-pkg/acquire.h> +#include <apt-pkg/hashes.h> +#include <apt-pkg/indexfile.h> +#include <apt-pkg/pkgcache.h> +#include <apt-pkg/weakptr.h> + +#include <map> +#include <string> +#include <unordered_map> +#include <vector> + + +/** \addtogroup acquire + * @{ + * + * \file acquire-item.h + */ + +class pkgRecords; +class pkgSourceList; +class pkgAcqMetaClearSig; +class pkgAcqIndexMergeDiffs; +class metaIndex; + +class APT_PUBLIC pkgAcquire::Item : public WeakPointable /*{{{*/ +/** \brief Represents the process by which a pkgAcquire object should + * retrieve a file or a collection of files. + * + * By convention, Item subclasses should insert themselves into the + * acquire queue when they are created by calling QueueURI(), and + * remove themselves by calling Dequeue() when either Done() or + * Failed() is invoked. Item objects are also responsible for + * notifying the download progress indicator (accessible via + * #Owner->Log) of their status. + * + * \see pkgAcquire + */ +{ + public: + + /** \brief The current status of this item. */ + enum ItemState + { + /** \brief The item is waiting to be downloaded. */ + StatIdle, + + /** \brief The item is currently being downloaded. */ + StatFetching, + + /** \brief The item has been successfully downloaded. */ + StatDone, + + /** \brief An error was encountered while downloading this + * item. + */ + StatError, + + /** \brief The item was downloaded but its authenticity could + * not be verified. + */ + StatAuthError, + + /** \brief The item was could not be downloaded because of + * a transient network error (e.g. network down) + */ + StatTransientNetworkError, + } Status; + + /** \brief Contains a textual description of the error encountered + * if #ItemState is #StatError or #StatAuthError. + */ + std::string ErrorText; + + /** \brief The size of the object to fetch. */ + unsigned long long FileSize; + + /** \brief How much of the object was already fetched. */ + unsigned long long PartialSize; + + /** \brief contains the name of the subprocess that is operating on this object + * (for instance, "gzip", "rred" or "gpgv"). This is obsoleting #Mode from above + * as it can manage the lifetime of included string properly. */ + std::string ActiveSubprocess; + + /** \brief A client-supplied unique identifier. + * + * This field is initialized to 0; it is meant to be filled in by + * clients that wish to use it to uniquely identify items. + * + * APT progress reporting will store an ID there as shown in "Get:42 …" + */ + unsigned long ID; + + /** \brief If \b true, the entire object has been successfully fetched. + * + * Subclasses should set this to \b true when appropriate. + */ + bool Complete; + + /** \brief If \b true, the URI of this object is "local". + * + * The only effect of this field is to exclude the object from the + * download progress indicator's overall statistics. + */ + bool Local; + + std::string UsedMirror; + + /** \brief The number of fetch queues into which this item has been + * inserted. + * + * There is one queue for each source from which an item could be + * downloaded. + * + * \sa pkgAcquire + */ + unsigned int QueueCounter; + + /** \brief The number of additional fetch items that are expected + * once this item is done. + * + * Some items like pkgAcqMeta{Index,Sig} will queue additional + * items. This variable can be set by the methods if it knows + * in advance how many items to expect to get a more accurate + * progress. + */ + unsigned int ExpectedAdditionalItems; + + /** \brief The name of the file into which the retrieved object + * will be written. + */ + std::string DestFile; + + /** \brief Number of retries */ + unsigned int Retries; + + /** \brief Invoked by the acquire worker when the object couldn't + * be fetched. + * + * This is a branch of the continuation of the fetch process. + * + * \param Message An RFC822-formatted message from the acquire + * method describing what went wrong. Use LookupTag() to parse + * it. + * + * \param Cnf The method via which the worker tried to fetch this object. + * + * \sa pkgAcqMethod + */ + virtual void Failed(std::string const &Message,pkgAcquire::MethodConfig const * const Cnf); + APT_HIDDEN void FailMessage(std::string const &Message); + + /** \brief Invoked by the acquire worker to check if the successfully + * fetched object is also the objected we wanted to have. + * + * Note that the object might \e not have been written to + * DestFile; check for the presence of an Alt-Filename entry in + * Message to find the file to which it was really written. + * + * This is called before Done is called and can prevent it by returning + * \b false which will result in Failed being called instead. + * + * You should prefer to use this method over calling Failed() from Done() + * as this has e.g. the wrong progress reporting. + * + * \param Message Data from the acquire method. Use LookupTag() + * to parse it. + * \param Cnf The method via which the object was fetched. + * + * \sa pkgAcqMethod + */ + virtual bool VerifyDone(std::string const &Message, + pkgAcquire::MethodConfig const * const Cnf); + + /** \brief Invoked by the acquire worker when the object was + * fetched successfully. + * + * Note that the object might \e not have been written to + * DestFile; check for the presence of an Alt-Filename entry in + * Message to find the file to which it was really written. + * + * Done is often used to switch from one stage of the processing + * to the next (e.g. fetching, unpacking, copying). It is one + * branch of the continuation of the fetch process. + * + * \param Message Data from the acquire method. Use LookupTag() + * to parse it. + * \param Hashes The HashSums of the object that was fetched. + * \param Cnf The method via which the object was fetched. + * + * \sa pkgAcqMethod + */ + virtual void Done(std::string const &Message, HashStringList const &Hashes, + pkgAcquire::MethodConfig const * const Cnf); + + /** \brief Invoked when the worker starts to fetch this object. + * + * \param Message RFC822-formatted data from the worker process. + * Use LookupTag() to parse it. + * + * \param Hashes The expected hashes of the object being fetched. + * + * \sa pkgAcqMethod + */ + virtual void Start(std::string const &Message, unsigned long long const Size); + + /** \brief Custom headers to be sent to the fetch process. + * + * \return a string containing RFC822-style headers that are to be + * inserted into the 600 URI Acquire message sent to the fetch + * subprocess. The headers are inserted after a newline-less + * line, so they should (if nonempty) have a leading newline and + * no trailing newline. + */ + virtual std::string Custom600Headers() const; + // this is more a hack than a proper external interface, hence hidden + APT_HIDDEN std::unordered_map<std::string, std::string> &ModifyCustomFields(); + // this isn't the super nicest interface either… + APT_HIDDEN bool PopAlternativeURI(std::string &NewURI); + APT_HIDDEN bool IsGoodAlternativeURI(std::string const &AltUri) const; + APT_HIDDEN void PushAlternativeURI(std::string &&NewURI, std::unordered_map<std::string, std::string> &&fields, bool const at_the_back); + APT_HIDDEN void RemoveAlternativeSite(std::string &&OldSite); + + /** \brief A "descriptive" URI-like string. + * + * \return a URI that should be used to describe what is being fetched. + */ + virtual std::string DescURI() const = 0; + /** \brief Short item description. + * + * \return a brief description of the object being fetched. + */ + virtual std::string ShortDesc() const; + + /** \brief Invoked by the worker when the download is completely done. */ + virtual void Finished(); + + /** \return HashSums the DestFile is supposed to have in this stage */ + virtual HashStringList GetExpectedHashes() const = 0; + /** \return the 'best' hash for display proposes like --print-uris */ + std::string HashSum() const; + + /** \return if having no hashes is a hard failure or not + * + * Idealy this is always \b true for every subclass, but thanks to + * historical grow we don't have hashes for all files in all cases + * in all steps, so it is slightly more complicated than it should be. + */ + virtual bool HashesRequired() const { return true; } + + /** \return the acquire process with which this item is associated. */ + pkgAcquire *GetOwner() const; + pkgAcquire::ItemDesc &GetItemDesc(); + + /** \return \b true if this object is being fetched from a trusted source. */ + virtual bool IsTrusted() const; + + /** \brief Set the name of the current active subprocess + * + * See also #ActiveSubprocess + */ + void SetActiveSubprocess(std::string const &subprocess); + + /** \brief Initialize an item. + * + * Adds the item to the list of items known to the acquire + * process, but does not place it into any fetch queues (you must + * manually invoke QueueURI() to do so). + * + * \param Owner The new owner of this item. + */ + explicit Item(pkgAcquire * const Owner); + + /** \brief Remove this item from its owner's queue by invoking + * pkgAcquire::Remove. + */ + virtual ~Item(); + + bool APT_HIDDEN IsRedirectionLoop(std::string const &NewURI); + /** \brief The priority of the item, used for queuing */ + int APT_HIDDEN Priority(); + + protected: + /** \brief The acquire object with which this item is associated. */ + pkgAcquire * const Owner; + + /** \brief The item that is currently being downloaded. */ + pkgAcquire::ItemDesc Desc; + + enum RenameOnErrorState { + HashSumMismatch, + SizeMismatch, + InvalidFormat, + SignatureError, + NotClearsigned, + MaximumSizeExceeded, + PDiffError, + }; + + /** \brief Rename failed file and set error + * + * \param state respresenting the error we encountered + */ + bool RenameOnError(RenameOnErrorState const state); + + /** \brief Insert this item into its owner's queue. + * + * The method is designed to check if the request would end + * in an IMSHit and if it determines that it would, it isn't + * queueing the Item and instead sets it to completion instantly. + * + * \param Item Metadata about this item (its URI and + * description). + * \return true if the item was inserted, false if IMSHit was detected + */ + virtual bool QueueURI(ItemDesc &Item); + + /** \brief Remove this item from its owner's queue. */ + void Dequeue(); + + /** \brief Rename a file without modifying its timestamp. + * + * Many item methods call this as their final action. + * + * \param From The file to be renamed. + * + * \param To The new name of \a From. If \a To exists it will be + * overwritten. If \a From and \a To are equal nothing happens. + */ + bool Rename(std::string const &From, std::string const &To); + + /** \brief Get the full pathname of the final file for the current URI */ + virtual std::string GetFinalFilename() const; + + private: + class Private; + Private * const d; + + friend class pkgAcqMetaBase; + friend class pkgAcqMetaClearSig; +}; + /*}}}*/ +class APT_HIDDEN pkgAcqTransactionItem: public pkgAcquire::Item /*{{{*/ +/** \brief baseclass for the indexes files to manage them all together */ +{ + void * const d; + protected: + HashStringList GetExpectedHashesFor(std::string const &MetaKey) const; + + bool QueueURI(pkgAcquire::ItemDesc &Item) APT_OVERRIDE; + + public: + IndexTarget const Target; + + /** \brief storge name until a transaction is finished */ + std::string PartialFile; + + /** \brief TransactionManager */ + pkgAcqMetaClearSig * const TransactionManager; + + enum TransactionStates { + TransactionStarted, + TransactionCommit, + TransactionAbort, + }; + virtual bool TransactionState(TransactionStates const state); + + virtual std::string DescURI() const APT_OVERRIDE { return Target.URI; } + virtual HashStringList GetExpectedHashes() const APT_OVERRIDE; + virtual std::string GetMetaKey() const; + virtual bool HashesRequired() const APT_OVERRIDE; + virtual bool AcquireByHash() const; + + pkgAcqTransactionItem(pkgAcquire * const Owner, pkgAcqMetaClearSig * const TransactionManager, IndexTarget const &Target) APT_NONNULL(2, 3); + virtual ~pkgAcqTransactionItem(); + + friend class pkgAcqMetaBase; + friend class pkgAcqMetaClearSig; +}; + /*}}}*/ +class APT_HIDDEN pkgAcqMetaBase : public pkgAcqTransactionItem /*{{{*/ +/** \brief the manager of a transaction */ +{ + void * const d; + protected: + std::vector<pkgAcqTransactionItem*> Transaction; + + /** \brief If \b true, the index's signature is currently being verified. + */ + bool AuthPass; + + /** \brief Called when a file is finished being retrieved. + * + * If the file was not downloaded to DestFile, a copy process is + * set up to copy it to DestFile; otherwise, Complete is set to \b + * true and the file is moved to its final location. + * + * \param Message The message block received from the fetch + * subprocess. + */ + bool CheckDownloadDone(pkgAcqTransactionItem * const I, const std::string &Message, HashStringList const &Hashes) const; + + /** \brief Queue the downloaded Signature for verification */ + void QueueForSignatureVerify(pkgAcqTransactionItem * const I, std::string const &File, std::string const &Signature); + + virtual std::string Custom600Headers() const APT_OVERRIDE; + + /** \brief Called when authentication succeeded. + * + * Sanity-checks the authenticated file, queues up the individual + * index files for download, and saves the signature in the lists + * directory next to the authenticated list file. + * + * \param Message The message block received from the fetch + * subprocess. + * \param Cnf The method and its configuration which handled the request + */ + bool CheckAuthDone(std::string const &Message, pkgAcquire::MethodConfig const *const Cnf); + + /** Check if the current item should fail at this point */ + bool CheckStopAuthentication(pkgAcquire::Item * const I, const std::string &Message); + + /** \brief Check that the release file is a release file for the + * correct distribution. + * + * \return \b true if no fatal errors were encountered. + */ + bool VerifyVendor(std::string const &Message); + + virtual bool TransactionState(TransactionStates const state) APT_OVERRIDE; + + public: + // This refers more to the Transaction-Manager than the actual file + bool IMSHit; + TransactionStates State; + std::string BaseURI; + + virtual bool QueueURI(pkgAcquire::ItemDesc &Item) APT_OVERRIDE; + virtual HashStringList GetExpectedHashes() const APT_OVERRIDE; + virtual bool HashesRequired() const APT_OVERRIDE; + + // transaction code + void Add(pkgAcqTransactionItem * const I); + void AbortTransaction(); + bool TransactionHasError() const; + void CommitTransaction(); + + /** \brief Stage (queue) a copy action when the transaction is committed + */ + void TransactionStageCopy(pkgAcqTransactionItem * const I, + const std::string &From, + const std::string &To); + /** \brief Stage (queue) a removal action when the transaction is committed + */ + void TransactionStageRemoval(pkgAcqTransactionItem * const I, const std::string &FinalFile); + + /** \brief Get the full pathname of the final file for the current URI */ + virtual std::string GetFinalFilename() const APT_OVERRIDE; + + pkgAcqMetaBase(pkgAcquire * const Owner, pkgAcqMetaClearSig * const TransactionManager, + IndexTarget const &DataTarget) APT_NONNULL(2, 3); + virtual ~pkgAcqMetaBase(); +}; + /*}}}*/ +/** \brief An item that is responsible for downloading the meta-index {{{ + * file (i.e., Release) itself and verifying its signature. + * + * Once the download and verification are complete, the downloads of + * the individual index files are queued up using pkgAcqDiffIndex. + * If the meta-index file had a valid signature, the expected hashsums + * of the index files will be the md5sums listed in the meta-index; + * otherwise, the expected hashsums will be "" (causing the + * authentication of the index files to be bypassed). + */ +class APT_HIDDEN pkgAcqMetaIndex : public pkgAcqMetaBase +{ + void * const d; + protected: + IndexTarget const DetachedSigTarget; + + /** \brief delayed constructor */ + void Init(std::string const &URIDesc, std::string const &ShortDesc); + + public: + virtual std::string DescURI() const APT_OVERRIDE; + + // Specialized action members + virtual void Failed(std::string const &Message,pkgAcquire::MethodConfig const * const Cnf) APT_OVERRIDE; + virtual void Done(std::string const &Message, HashStringList const &Hashes, + pkgAcquire::MethodConfig const * const Cnf) APT_OVERRIDE; + + /** \brief Create a new pkgAcqMetaIndex. */ + pkgAcqMetaIndex(pkgAcquire * const Owner, pkgAcqMetaClearSig * const TransactionManager, + IndexTarget const &DataTarget, IndexTarget const &DetachedSigTarget) APT_NONNULL(2, 3); + virtual ~pkgAcqMetaIndex(); + + friend class pkgAcqMetaSig; +}; + /*}}}*/ +/** \brief An acquire item that downloads the detached signature {{{ + * of a meta-index (Release) file, then queues up the release + * file itself. + * + * \todo Why protected members? + * + * \sa pkgAcqMetaIndex + */ +class APT_HIDDEN pkgAcqMetaSig : public pkgAcqTransactionItem +{ + void * const d; + + pkgAcqMetaIndex * const MetaIndex; + + /** \brief The file we use to verify the MetaIndexFile with (not always set!) */ + std::string MetaIndexFileSignature; + + protected: + + /** \brief Get the full pathname of the final file for the current URI */ + virtual std::string GetFinalFilename() const APT_OVERRIDE; + + public: + virtual bool HashesRequired() const APT_OVERRIDE { return false; } + + // Specialized action members + virtual void Failed(std::string const &Message,pkgAcquire::MethodConfig const * const Cnf) APT_OVERRIDE; + virtual void Done(std::string const &Message, HashStringList const &Hashes, + pkgAcquire::MethodConfig const * const Cnf) APT_OVERRIDE; + virtual std::string Custom600Headers() const APT_OVERRIDE; + + /** \brief Create a new pkgAcqMetaSig. */ + pkgAcqMetaSig(pkgAcquire * const Owner, pkgAcqMetaClearSig * const TransactionManager, + IndexTarget const &Target, pkgAcqMetaIndex * const MetaIndex) APT_NONNULL(2, 3, 5); + virtual ~pkgAcqMetaSig(); +}; + /*}}}*/ +/** \brief An item responsible for downloading clearsigned metaindexes {{{*/ +class APT_HIDDEN pkgAcqMetaClearSig : public pkgAcqMetaIndex +{ + void * const d; + IndexTarget const DetachedDataTarget; + + public: + /** \brief A package-system-specific parser for the meta-index file. */ + metaIndex *MetaIndexParser; + metaIndex *LastMetaIndexParser; + + virtual void Failed(std::string const &Message,pkgAcquire::MethodConfig const * const Cnf) APT_OVERRIDE; + virtual std::string Custom600Headers() const APT_OVERRIDE; + virtual bool VerifyDone(std::string const &Message, pkgAcquire::MethodConfig const * const Cnf) APT_OVERRIDE; + virtual void Done(std::string const &Message, HashStringList const &Hashes, + pkgAcquire::MethodConfig const * const Cnf) APT_OVERRIDE; + virtual void Finished() APT_OVERRIDE; + + /** \brief Starts downloading the individual index files. + * + * \param verify If \b true, only indices whose expected hashsum + * can be determined from the meta-index will be downloaded, and + * the hashsums of indices will be checked (reporting + * #StatAuthError if there is a mismatch). If verify is \b false, + * no hashsum checking will be performed. + */ + void QueueIndexes(bool const verify); + + /** \brief Create a new pkgAcqMetaClearSig. */ + pkgAcqMetaClearSig(pkgAcquire * const Owner, + IndexTarget const &ClearsignedTarget, + IndexTarget const &DetachedDataTarget, + IndexTarget const &DetachedSigTarget, + metaIndex * const MetaIndexParser); + virtual ~pkgAcqMetaClearSig(); +}; + /*}}}*/ +/** \brief Common base class for all classes that deal with fetching indexes {{{*/ +class APT_HIDDEN pkgAcqBaseIndex : public pkgAcqTransactionItem +{ + void * const d; + + public: + /** \brief Get the full pathname of the final file for the current URI */ + virtual std::string GetFinalFilename() const APT_OVERRIDE; + virtual void Failed(std::string const &Message,pkgAcquire::MethodConfig const * const Cnf) APT_OVERRIDE; + + pkgAcqBaseIndex(pkgAcquire * const Owner, pkgAcqMetaClearSig * const TransactionManager, + IndexTarget const &Target) APT_NONNULL(2, 3); + virtual ~pkgAcqBaseIndex(); +}; + /*}}}*/ +/** \brief An acquire item that is responsible for fetching an index {{{ + * file (e.g., Packages or Sources). + * + * \sa pkgAcqDiffIndex, pkgAcqIndexDiffs, pkgAcqIndexTrans + * + * \todo Why does pkgAcqIndex have protected members? + */ +class APT_HIDDEN pkgAcqIndex : public pkgAcqBaseIndex +{ + void * const d; + + protected: + + /** \brief The stages the method goes through + * + * The method first downloads the indexfile, then its decompressed (or + * copied) and verified + */ + enum AllStages { + STAGE_DOWNLOAD, + STAGE_DECOMPRESS_AND_VERIFY, + }; + AllStages Stage; + + /** \brief Handle what needs to be done when the download is done */ + void StageDownloadDone(std::string const &Message); + + /** \brief Handle what needs to be done when the decompression/copy is + * done + */ + void StageDecompressDone(); + + /** \brief If \b set, this partially downloaded file will be + * removed when the download completes. + */ + std::string EraseFileName; + + /** \brief The compression-related file extensions that are being + * added to the downloaded file one by one if first fails (e.g., "gz bz2"). + */ + std::string CompressionExtensions; + + /** \brief The actual compression extension currently used */ + std::string CurrentCompressionExtension; + + /** \brief Do the changes needed to fetch via AptByHash (if needed) */ + void InitByHashIfNeeded(); + + /** \brief Get the full pathname of the final file for the current URI */ + virtual std::string GetFinalFilename() const APT_OVERRIDE; + + virtual bool TransactionState(TransactionStates const state) APT_OVERRIDE; + + public: + // Specialized action members + virtual void Failed(std::string const &Message,pkgAcquire::MethodConfig const * const Cnf) APT_OVERRIDE; + virtual void Done(std::string const &Message, HashStringList const &Hashes, + pkgAcquire::MethodConfig const * const Cnf) APT_OVERRIDE; + virtual std::string Custom600Headers() const APT_OVERRIDE; + virtual std::string DescURI() const APT_OVERRIDE {return Desc.URI;}; + virtual std::string GetMetaKey() const APT_OVERRIDE; + + pkgAcqIndex(pkgAcquire * const Owner, pkgAcqMetaClearSig * const TransactionManager, + IndexTarget const &Target, bool const Derived = false) APT_NONNULL(2, 3); + virtual ~pkgAcqIndex(); + + protected: + APT_HIDDEN void Init(std::string const &URI, std::string const &URIDesc, + std::string const &ShortDesc); + APT_HIDDEN bool CommonFailed(std::string const &TargetURI, + std::string const &Message, pkgAcquire::MethodConfig const *const Cnf); +}; + /*}}}*/ +struct APT_HIDDEN DiffInfo { /*{{{*/ + /** The filename of the diff. */ + std::string file; + + /** The hashes of the file after the diff is applied */ + HashStringList result_hashes; + + /** The hashes of the diff */ + HashStringList patch_hashes; + + /** The hashes of the compressed diff */ + HashStringList download_hashes; +}; + /*}}}*/ +/** \brief An item that is responsible for fetching an index file of {{{ + * package list diffs and starting the package list's download. + * + * This item downloads the Index file and parses it, then enqueues + * additional downloads of either the individual patches (using + * pkgAcqIndexDiffs) or the entire Packages file (using pkgAcqIndex). + * + * \sa pkgAcqIndexDiffs, pkgAcqIndex + */ +class APT_HIDDEN pkgAcqDiffIndex : public pkgAcqIndex +{ + void * const d; + std::vector<pkgAcqIndexMergeDiffs*> * diffs; + std::vector<DiffInfo> available_patches; + bool pdiff_merge; + + protected: + /** \brief If \b true, debugging information will be written to std::clog. */ + bool Debug; + + /** \brief Get the full pathname of the final file for the current URI */ + virtual std::string GetFinalFilename() const APT_OVERRIDE; + + virtual bool QueueURI(pkgAcquire::ItemDesc &Item) APT_OVERRIDE; + + virtual bool TransactionState(TransactionStates const state) APT_OVERRIDE; + public: + // Specialized action members + virtual void Failed(std::string const &Message, pkgAcquire::MethodConfig const * const Cnf) APT_OVERRIDE; + virtual bool VerifyDone(std::string const &Message, pkgAcquire::MethodConfig const * const Cnf) APT_OVERRIDE; + virtual void Done(std::string const &Message, HashStringList const &Hashes, + pkgAcquire::MethodConfig const * const Cnf) APT_OVERRIDE; + virtual std::string DescURI() const APT_OVERRIDE {return Target.URI + "Index";}; + virtual std::string GetMetaKey() const APT_OVERRIDE; + + /** \brief Parse the Index file for a set of Packages diffs. + * + * Parses the Index file and creates additional download items as + * necessary. + * + * \param IndexDiffFile The name of the Index file. + * + * \return \b true if the Index file was successfully parsed, \b + * false otherwise. + */ + bool ParseDiffIndex(std::string const &IndexDiffFile); + + /** \brief Create a new pkgAcqDiffIndex. + * + * \param Owner The Acquire object that owns this item. + * + * \param URI The URI of the list file to download. + * + * \param URIDesc A long description of the list file to download. + * + * \param ShortDesc A short description of the list file to download. + */ + pkgAcqDiffIndex(pkgAcquire * const Owner, pkgAcqMetaClearSig * const TransactionManager, + IndexTarget const &Target) APT_NONNULL(2, 3); + virtual ~pkgAcqDiffIndex(); + private: + APT_HIDDEN void QueueOnIMSHit() const; +}; + /*}}}*/ +/** \brief An item that is responsible for fetching client-merge patches {{{ + * that need to be applied to a given package index file. + * + * Instead of downloading and applying each patch one by one like its + * sister #pkgAcqIndexDiffs this class will download all patches at once + * and call rred with all the patches downloaded once. Rred will then + * merge and apply them in one go, which should be a lot faster – but is + * incompatible with server-based merges of patches like reprepro can do. + * + * \sa pkgAcqDiffIndex, pkgAcqIndex + */ +class APT_HIDDEN pkgAcqIndexMergeDiffs : public pkgAcqBaseIndex +{ + protected: + + /** \brief If \b true, debugging output will be written to + * std::clog. + */ + bool Debug; + + /** \brief information about the current patch */ + struct DiffInfo const patch; + + /** \brief list of all download items for the patches */ + std::vector<pkgAcqIndexMergeDiffs*> const * const allPatches; + + /** The current status of this patch. */ + enum DiffState + { + /** \brief The diff is currently being fetched. */ + StateFetchDiff, + + /** \brief The diff is currently being applied. */ + StateApplyDiff, + + /** \brief the work with this diff is done */ + StateDoneDiff, + + /** \brief something bad happened and fallback was triggered */ + StateErrorDiff + } State; + + public: + /** \brief Called when the patch file failed to be downloaded. + * + * This method will fall back to downloading the whole index file + * outright; its arguments are ignored. + */ + virtual void Failed(std::string const &Message,pkgAcquire::MethodConfig const * const Cnf) APT_OVERRIDE; + virtual void Done(std::string const &Message, HashStringList const &Hashes, + pkgAcquire::MethodConfig const * const Cnf) APT_OVERRIDE; + virtual std::string Custom600Headers() const APT_OVERRIDE; + virtual std::string DescURI() const APT_OVERRIDE {return Target.URI + "Index";}; + virtual HashStringList GetExpectedHashes() const APT_OVERRIDE; + virtual bool HashesRequired() const APT_OVERRIDE; + virtual bool AcquireByHash() const APT_OVERRIDE; + + /** \brief Create an index merge-diff item. + * + * \param Owner The pkgAcquire object that owns this item. + * \param TransactionManager responsible for this item + * \param Target we intend to built via pdiff patching + * \param baseURI is the URI used for the Index, but stripped down to Target + * \param DiffInfo of the patch in question + * \param patch contains infos about the patch this item is supposed + * to download which were read from the index + * \param allPatches contains all related items so that each item can + * check if it was the last one to complete the download step + */ + pkgAcqIndexMergeDiffs(pkgAcquire *const Owner, pkgAcqMetaClearSig *const TransactionManager, + IndexTarget const &Target, DiffInfo const &patch, + std::vector<pkgAcqIndexMergeDiffs *> const *const allPatches) APT_NONNULL(2, 3, 6); + virtual ~pkgAcqIndexMergeDiffs(); +}; + /*}}}*/ +/** \brief An item that is responsible for fetching server-merge patches {{{ + * that need to be applied to a given package index file. + * + * After downloading and applying a single patch, this item will + * enqueue a new pkgAcqIndexDiffs to download and apply the remaining + * patches. If no patch can be found that applies to an intermediate + * file or if one of the patches cannot be downloaded, falls back to + * downloading the entire package index file using pkgAcqIndex. + * + * \sa pkgAcqDiffIndex, pkgAcqIndex + */ +class APT_HIDDEN pkgAcqIndexDiffs : public pkgAcqBaseIndex +{ + private: + + /** \brief Queue up the next diff download. + * + * Search for the next available diff that applies to the file + * that currently exists on disk, and enqueue it by calling + * QueueURI(). + * + * \return \b true if an applicable diff was found, \b false + * otherwise. + */ + APT_HIDDEN bool QueueNextDiff(); + + /** \brief Handle tasks that must be performed after the item + * finishes downloading. + * + * Dequeues the item and checks the resulting file's hashsums + * against ExpectedHashes after the last patch was applied. + * There is no need to check the md5/sha1 after a "normal" + * patch because QueueNextDiff() will check the sha1 later. + * + * \param allDone If \b true, the file was entirely reconstructed, + * and its md5sum is verified. + */ + APT_HIDDEN void Finish(bool const allDone=false); + + protected: + + /** \brief If \b true, debugging output will be written to + * std::clog. + */ + bool Debug; + + /** The patches that remain to be downloaded, including the patch + * being downloaded right now. This list should be ordered so + * that each diff appears before any diff that depends on it. + * + * \todo These are indexed by sha1sum; why not use some sort of + * dictionary instead of relying on ordering and stripping them + * off the front? + */ + std::vector<DiffInfo> available_patches; + + /** The current status of this patch. */ + enum DiffState + { + /** \brief The diff is currently being fetched. */ + StateFetchDiff, + + /** \brief The diff is currently being applied. */ + StateApplyDiff + } State; + + public: + + /** \brief Called when the patch file failed to be downloaded. + * + * This method will fall back to downloading the whole index file + * outright; its arguments are ignored. + */ + virtual void Failed(std::string const &Message,pkgAcquire::MethodConfig const * const Cnf) APT_OVERRIDE; + + virtual void Done(std::string const &Message, HashStringList const &Hashes, + pkgAcquire::MethodConfig const * const Cnf) APT_OVERRIDE; + virtual std::string Custom600Headers() const APT_OVERRIDE; + virtual std::string DescURI() const APT_OVERRIDE {return Target.URI + "IndexDiffs";}; + virtual HashStringList GetExpectedHashes() const APT_OVERRIDE; + virtual bool HashesRequired() const APT_OVERRIDE; + virtual bool AcquireByHash() const APT_OVERRIDE; + + /** \brief Create an index diff item. + * + * After filling in its basic fields, this invokes Finish(true) if + * \a diffs is empty, or QueueNextDiff() otherwise. + * + * \param Owner The pkgAcquire object that owns this item. + * \param TransactionManager responsible for this item + * \param Target we want to built via pdiff patching + * \param baseURI is the URI used for the Index, but stripped down to Target + * \param diffs The remaining diffs from the index of diffs. They + * should be ordered so that each diff appears before any diff + * that depends on it. + */ + pkgAcqIndexDiffs(pkgAcquire *const Owner, pkgAcqMetaClearSig *const TransactionManager, + IndexTarget const &Target, + std::vector<DiffInfo> const &diffs = std::vector<DiffInfo>()) APT_NONNULL(2, 3); + virtual ~pkgAcqIndexDiffs(); +}; + /*}}}*/ +/** \brief An item that is responsible for fetching a package file. {{{ + * + * If the package file already exists in the cache, nothing will be + * done. + */ +class APT_PUBLIC pkgAcqArchive : public pkgAcquire::Item +{ + void * const d; + + bool LocalSource; + HashStringList ExpectedHashes; + + protected: + /** \brief The package version being fetched. */ + pkgCache::VerIterator Version; + + /** \brief The list of sources from which to pick archives to + * download this package from. + */ + pkgSourceList *Sources; + + /** \brief A package records object, used to look up the file + * corresponding to each version of the package. + */ + pkgRecords *Recs; + + /** \brief A location in which the actual filename of the package + * should be stored. + */ + std::string &StoreFilename; + + /** \brief \b true if this version file is being downloaded from a + * trusted source. + */ + bool Trusted; + + /** \brief Queue up the next available file for this version. */ + bool QueueNext(); + + /** \brief Get the full pathname of the final file for the current URI */ + virtual std::string GetFinalFilename() const APT_OVERRIDE; + + public: + + virtual void Failed(std::string const &Message,pkgAcquire::MethodConfig const * const Cnf) APT_OVERRIDE; + virtual void Done(std::string const &Message, HashStringList const &Hashes, + pkgAcquire::MethodConfig const * const Cnf) APT_OVERRIDE; + virtual std::string DescURI() const APT_OVERRIDE; + virtual std::string ShortDesc() const APT_OVERRIDE; + virtual void Finished() APT_OVERRIDE; + virtual bool IsTrusted() const APT_OVERRIDE; + virtual HashStringList GetExpectedHashes() const APT_OVERRIDE; + virtual bool HashesRequired() const APT_OVERRIDE; + + /** \brief Create a new pkgAcqArchive. + * + * \param Owner The pkgAcquire object with which this item is + * associated. + * + * \param Sources The sources from which to download version + * files. + * + * \param Recs A package records object, used to look up the file + * corresponding to each version of the package. + * + * \param Version The package version to download. + * + * \param[out] StoreFilename A location in which the actual filename of + * the package should be stored. It will be set to a guessed + * basename in the constructor, and filled in with a fully + * qualified filename once the download finishes. + */ + pkgAcqArchive(pkgAcquire * const Owner,pkgSourceList * const Sources, + pkgRecords * const Recs,pkgCache::VerIterator const &Version, + std::string &StoreFilename); + virtual ~pkgAcqArchive(); +}; + /*}}}*/ +/** \brief Retrieve the changelog for the given version {{{ + * + * Downloads the changelog to a temporary file it will also remove again + * while it is deconstructed or downloads it to a named location. + */ +class APT_PUBLIC pkgAcqChangelog : public pkgAcquire::Item +{ + class Private; + Private * const d; + std::string TemporaryDirectory; + std::string const SrcName; + std::string const SrcVersion; + + public: + // we will never have hashes for changelogs. + // If you need verified ones, download the deb and extract the changelog. + virtual HashStringList GetExpectedHashes() const APT_OVERRIDE { return HashStringList(); } + virtual bool HashesRequired() const APT_OVERRIDE { return false; } + + // Specialized action members + virtual void Failed(std::string const &Message,pkgAcquire::MethodConfig const * const Cnf) APT_OVERRIDE; + virtual void Done(std::string const &Message, HashStringList const &CalcHashes, + pkgAcquire::MethodConfig const * const Cnf) APT_OVERRIDE; + virtual std::string DescURI() const APT_OVERRIDE {return Desc.URI;}; + + /** returns the URI to the changelog of this version + * + * @param Ver is the version to get the changelog for + * @return the URI which will be used to acquire the changelog + */ + static std::string URI(pkgCache::VerIterator const &Ver); + + /** returns the URI to the changelog of this version + * + * \param Rls is the Release file the package comes from + * \param Component in which the package resides, can be empty + * \param SrcName is the source package name + * \param SrcVersion is the source package version + * @return the URI which will be used to acquire the changelog + */ + static std::string URI(pkgCache::RlsFileIterator const &Rls, + char const * const Component, char const * const SrcName, + char const * const SrcVersion); + + /** returns the URI to the changelog of this version + * + * \param Template URI where @CHANGEPATH@ has to be filled in + * \param Component in which the package resides, can be empty + * \param SrcName is the source package name + * \param SrcVersion is the source package version + * @return the URI which will be used to acquire the changelog + */ + static std::string URI(std::string const &Template, + char const * const Component, char const * const SrcName, + char const * const SrcVersion); + + /** returns the URI template for this release file + * + * \param Rls is a Release file + * @return the URI template to use for this release file + */ + static std::string URITemplate(pkgCache::RlsFileIterator const &Rls); + + /** \brief Create a new pkgAcqChangelog object. + * + * \param Owner The pkgAcquire object with which this object is + * associated. + * \param Ver is the version to get the changelog for + * \param DestDir The directory the file should be downloaded into. + * Will be an autocreated (and cleaned up) temporary directory if not set. + * \param DestFilename The filename the file should have in #DestDir + * Defaults to sourcepackagename.changelog if not set. + */ + pkgAcqChangelog(pkgAcquire * const Owner, pkgCache::VerIterator const &Ver, + std::string const &DestDir="", std::string const &DestFilename=""); + + /** \brief Create a new pkgAcqChangelog object. + * + * \param Owner The pkgAcquire object with which this object is + * associated. + * \param Rls is the Release file the package comes from + * \param Component in which the package resides, can be empty + * \param SrcName is the source package name + * \param SrcVersion is the source package version + * \param DestDir The directory the file should be downloaded into. + * Will be an autocreated (and cleaned up) temporary directory if not set. + * \param DestFilename The filename the file should have in #DestDir + * Defaults to sourcepackagename.changelog if not set. + */ + pkgAcqChangelog(pkgAcquire * const Owner, pkgCache::RlsFileIterator const &Rls, + char const * const Component, char const * const SrcName, char const * const SrcVersion, + std::string const &DestDir="", std::string const &DestFilename=""); + + /** \brief Create a new pkgAcqChangelog object. + * + * \param Owner The pkgAcquire object with which this object is + * associated. + * \param URI is to be used to get the changelog + * \param SrcName is the source package name + * \param SrcVersion is the source package version + * \param DestDir The directory the file should be downloaded into. + * Will be an autocreated (and cleaned up) temporary directory if not set. + * \param DestFilename The filename the file should have in #DestDir + * Defaults to sourcepackagename.changelog if not set. + */ + pkgAcqChangelog(pkgAcquire * const Owner, std::string const &URI, + char const * const SrcName, char const * const SrcVersion, + std::string const &DestDir="", std::string const &DestFilename=""); + + virtual ~pkgAcqChangelog(); + +private: + APT_HIDDEN void Init(std::string const &DestDir, std::string const &DestFilename); +}; + /*}}}*/ +/** \brief Retrieve an arbitrary file to the current directory. {{{ + * + * The file is retrieved even if it is accessed via a URL type that + * normally is a NOP, such as "file". If the download fails, the + * partial file is renamed to get a ".FAILED" extension. + */ +class APT_PUBLIC pkgAcqFile : public pkgAcquire::Item +{ + void * const d; + + /** \brief Should this file be considered a index file */ + bool IsIndexFile; + + HashStringList const ExpectedHashes; + public: + virtual HashStringList GetExpectedHashes() const APT_OVERRIDE; + virtual bool HashesRequired() const APT_OVERRIDE; + + // Specialized action members + virtual void Done(std::string const &Message, HashStringList const &CalcHashes, + pkgAcquire::MethodConfig const * const Cnf) APT_OVERRIDE; + virtual std::string DescURI() const APT_OVERRIDE {return Desc.URI;}; + virtual std::string Custom600Headers() const APT_OVERRIDE; + + /** \brief Create a new pkgAcqFile object. + * + * \param Owner The pkgAcquire object with which this object is + * associated. + * + * \param URI The URI to download. + * + * \param Hashes The hashsums of the file to download, if they are known; + * otherwise empty list. + * + * \param Size The size of the file to download, if it is known; + * otherwise 0. + * + * \param Desc A description of the file being downloaded. + * + * \param ShortDesc A brief description of the file being + * downloaded. + * + * \param DestDir The directory the file should be downloaded into. + * + * \param DestFilename The filename+path the file is downloaded to. + * + * \param IsIndexFile The file is considered a IndexFile and cache-control + * headers like "cache-control: max-age=0" are send + * + * If DestFilename is empty, download to DestDir/\<basename\> if + * DestDir is non-empty, $CWD/\<basename\> otherwise. If + * DestFilename is NOT empty, DestDir is ignored and DestFilename + * is the absolute name to which the file should be downloaded. + */ + + pkgAcqFile(pkgAcquire * const Owner, std::string const &URI, HashStringList const &Hashes, unsigned long long const Size, + std::string const &Desc, std::string const &ShortDesc, + std::string const &DestDir="", std::string const &DestFilename="", + bool const IsIndexFile=false); + virtual ~pkgAcqFile(); +}; + /*}}}*/ +class APT_HIDDEN pkgAcqAuxFile : public pkgAcqFile /*{{{*/ +{ + pkgAcquire::Item *const Owner; + pkgAcquire::Worker *const Worker; + unsigned long long MaximumSize; + + public: + virtual void Failed(std::string const &Message, pkgAcquire::MethodConfig const *const Cnf) APT_OVERRIDE; + virtual void Done(std::string const &Message, HashStringList const &CalcHashes, + pkgAcquire::MethodConfig const *const Cnf) APT_OVERRIDE; + virtual std::string Custom600Headers() const APT_OVERRIDE; + virtual void Finished() APT_OVERRIDE; + + pkgAcqAuxFile(pkgAcquire::Item *const Owner, pkgAcquire::Worker *const Worker, + std::string const &ShortDesc, std::string const &Desc, std::string const &URI, + HashStringList const &Hashes, unsigned long long const MaximumSize); + virtual ~pkgAcqAuxFile(); +}; + /*}}}*/ +/** @} */ + +#endif |