pkgAcqMetaIndex Class Reference
Acquire system {{{

An item that is responsible for downloading the meta-index {{{ file (i.e., Release) itself and verifying its signature. More...

`#include <apt-pkg/acquire-item.h>`

Inheritance diagram for pkgAcqMetaIndex:
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Collaboration diagram for pkgAcqMetaIndex:
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## Public Member Functions

std::string | DescURI () const override
| A "descriptive" URI-like string.
void | Failed (std::string const &Message, pkgAcquire::MethodConfig const *Cnf) override
| Invoked by the acquire worker when the object couldn't be fetched.
void | Done (std::string const &Message, HashStringList const &Hashes, pkgAcquire::MethodConfig const *Cnf) override
| Invoked by the acquire worker when the object was fetched successfully.
| pkgAcqMetaIndex (pkgAcquire *const Owner, pkgAcqMetaClearSig *const TransactionManager, IndexTarget const &DataTarget, IndexTarget const &DetachedSigTarget) APT_NONNULL(2
| Create a new pkgAcqMetaIndex.
Public Member Functions inherited from pkgAcqMetaBase
bool | QueueURI (pkgAcquire::ItemDesc &Item) override
| Insert this item into its owner's queue.
HashStringList | GetExpectedHashes () const override
bool | HashesRequired () const override
void | Add (pkgAcqTransactionItem *const I)
void | AbortTransaction ()
bool | TransactionHasError () const
void | CommitTransaction ()
void | TransactionStageCopy (pkgAcqTransactionItem *const I, const std::string &From, const std::string &To)
| Stage (queue) a copy action when the transaction is committed.
void | TransactionStageRemoval (pkgAcqTransactionItem *const I, const std::string &FinalFile)
| Stage (queue) a removal action when the transaction is committed.
std::string | GetFinalFilename () const override
| Get the full pathname of the final file for the current URI.
| pkgAcqMetaBase (pkgAcquire *const Owner, pkgAcqMetaClearSig *const TransactionManager, IndexTarget const &DataTarget) APT_NONNULL(2
Public Member Functions inherited from pkgAcqTransactionItem
std::string | DescURI () const override
| A "descriptive" URI-like string.
HashStringList | GetExpectedHashes () const override
virtual std::string | GetMetaKey () const
bool | HashesRequired () const override
virtual bool | AcquireByHash () const
| pkgAcqTransactionItem (pkgAcquire *const Owner, pkgAcqMetaClearSig *const TransactionManager, IndexTarget const &Target) APT_NONNULL(2
Public Member Functions inherited from pkgAcquire::Item
APT_HIDDEN void | FailMessage (std::string const &Message)
virtual bool | VerifyDone (std::string const &Message, pkgAcquire::MethodConfig const *const Cnf)
| Invoked by the acquire worker to check if the successfully fetched object is also the objected we wanted to have.
virtual void | Start (std::string const &Message, unsigned long long const Size)
| Invoked when the worker starts to fetch this object.
APT_HIDDEN std::unordered_map< std::string, std::string > & | ModifyCustomFields ()
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 const &AltUri)
virtual std::string | ShortDesc () const
| Short item description.
APT_HIDDEN void | Cancelled ()
| Invoked by the worker when the download is cancelled before completion.
virtual void | Finished ()
| Invoked by the worker when the download is completely done.
std::string | HashSum () const
pkgAcquire * | GetOwner () const
pkgAcquire::ItemDesc & | GetItemDesc ()
virtual bool | IsTrusted () const
void | SetActiveSubprocess (std::string const &subprocess)
| Set the name of the current active subprocess.
| Item (pkgAcquire *const Owner)
| Initialize an item.
virtual | ~Item ()
| Remove this item from its owner's queue by invoking pkgAcquire::Remove.
bool APT_HIDDEN | IsRedirectionLoop (std::string const &NewURI)
int APT_HIDDEN | Priority ()
| The priority of the item, used for queuing.
void APT_HIDDEN | FetchAfter (time_point FetchAfter)
| internal clock definitions to avoid typing all that all over the place
time_point APT_HIDDEN | FetchAfter ()
Public Member Functions inherited from WeakPointable
void | AddWeakPointer (WeakPointable **weakptr)
void | RemoveWeakPointer (WeakPointable **weakptr)
| ~WeakPointable ()

## Protected Member Functions

void | Init (std::string const &URIDesc, std::string const &ShortDesc)
| delayed constructor
Protected Member Functions inherited from pkgAcqMetaBase
bool | CheckDownloadDone (pkgAcqTransactionItem *const I, const std::string &Message, HashStringList const &Hashes) const
| Called when a file is finished being retrieved.
void | QueueForSignatureVerify (pkgAcqTransactionItem *const I, std::string const &File, std::string const &Signature)
| Queue the downloaded Signature for verification.
std::string | Custom600Headers () const override
| Custom headers to be sent to the fetch process.
bool | CheckAuthDone (std::string const &Message, pkgAcquire::MethodConfig const *const Cnf)
| Called when authentication succeeded.
bool | CheckStopAuthentication (pkgAcquire::Item *const I, const std::string &Message)
bool | VerifyVendor (std::string const &Message)
| Check that the release file is a release file for the correct distribution.
bool | TransactionState (TransactionStates state) override
Protected Member Functions inherited from pkgAcqTransactionItem
HashStringList | GetExpectedHashesFor (std::string const &MetaKey) const
bool | QueueURI (pkgAcquire::ItemDesc &Item) override
| Insert this item into its owner's queue.
Protected Member Functions inherited from pkgAcquire::Item
bool | RenameOnError (RenameOnErrorState const state)
| Rename failed file and set error.
void | Dequeue ()
| Remove this item from its owner's queue.
bool | Rename (std::string const &From, std::string const &To)
| Rename a file without modifying its timestamp.

## Protected Attributes

IndexTarget const | DetachedSigTarget
Protected Attributes inherited from pkgAcqMetaBase
std::vector< pkgAcqTransactionItem * > | Transaction
bool | AuthPass
| If true, the index's signature is currently being verified.
Protected Attributes inherited from pkgAcquire::Item
pkgAcquire *const | Owner
| The acquire object with which this item is associated.
pkgAcquire::ItemDesc | Desc
| The item that is currently being downloaded.

## Friends

class | pkgAcqMetaSig

## Additional Inherited Members

Public Types inherited from pkgAcqTransactionItem
enum | TransactionStates { TransactionStarted , TransactionCommit , TransactionAbort }
Public Types inherited from pkgAcquire::Item
enum | ItemState { StatIdle , StatFetching , StatDone , StatError , StatAuthError , StatTransientNetworkError }
| The current status of this item. More...
Public Attributes inherited from pkgAcqMetaBase
bool | IMSHit
TransactionStates | State
std::string | BaseURI
Public Attributes inherited from pkgAcqTransactionItem
IndexTarget const | Target
std::string | PartialFile
| storge name until a transaction is finished
pkgAcqMetaClearSig *const | TransactionManager
| TransactionManager.
Public Attributes inherited from pkgAcquire::Item
enum pkgAcquire::Item::ItemState | Status
std::string | ErrorText
| Contains a textual description of the error encountered if ItemState is StatError or StatAuthError.
unsigned long long | FileSize
| The size of the object to fetch.
unsigned long long | PartialSize
| How much of the object was already fetched.
std::string | ActiveSubprocess
| 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.
unsigned long | ID
| A client-supplied unique identifier.
bool | Complete
| If true, the entire object has been successfully fetched.
bool | Local
| If true, the URI of this object is "local".
std::string | UsedMirror
unsigned int | QueueCounter
| The number of fetch queues into which this item has been inserted.
unsigned int | ExpectedAdditionalItems
| The number of additional fetch items that are expected once this item is done.
std::string | DestFile
| The name of the file into which the retrieved object will be written.
unsigned int | Retries
| Number of retries.
Protected Types inherited from pkgAcquire::Item
enum | RenameOnErrorState { HashSumMismatch , SizeMismatch , InvalidFormat , SignatureError , NotClearsigned , MaximumSizeExceeded , PDiffError }

## Detailed Description

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).

## Member Function Documentation

## DescURI()

std::string DescURI | ( |  | ) | const

nodiscard override virtual

A "descriptive" URI-like string.

Returns
  a URI that should be used to describe what is being fetched.

Implements pkgAcquire::Item.

## Done()

void Done | ( | std::string const & | Message,
|  | HashStringList const & | Hashes,
|  | pkgAcquire::MethodConfig const * | Cnf )

override virtual

Invoked by the acquire worker when the object was fetched successfully.

Note that the object might 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.

Parameters

  Message | Data from the acquire method. Use LookupTag() to parse it.
  Hashes | The HashSums of the object that was fetched.
  Cnf | The method via which the object was fetched.

See also
  pkgAcqMethod

Reimplemented from pkgAcquire::Item.

References pkgAcqMetaBase::CheckDownloadDone(), pkgAcquire::Item::Owner, and pkgAcqTransactionItem::TransactionManager.

## Failed()

void Failed | ( | std::string const & | Message,
|  | pkgAcquire::MethodConfig const * | Cnf )

override virtual

Invoked by the acquire worker when the object couldn't be fetched.

This is a branch of the continuation of the fetch process.

Parameters

  Message | An RFC822-formatted message from the acquire method describing what went wrong. Use LookupTag() to parse it.
  Cnf | The method via which the worker tried to fetch this object.

See also
  pkgAcqMethod

Reimplemented from pkgAcquire::Item.

References pkgAcquire::Item::Failed(), pkgAcqMetaBase::GetFinalFilename(), pkgAcquire::Item::StatDone, and pkgAcqTransactionItem::TransactionManager.

The documentation for this class was generated from the following files:

- apt-pkg/acquire-item.h
- apt-pkg/acquire-item.cc