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Diffstat (limited to 'apt-pkg/edsp.h')
| -rw-r--r-- | apt-pkg/edsp.h | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/apt-pkg/edsp.h b/apt-pkg/edsp.h new file mode 100644 index 0000000..0c37e23 --- /dev/null +++ b/apt-pkg/edsp.h @@ -0,0 +1,252 @@ +// -*- mode: cpp; mode: fold -*- +/** Description \file edsp.h {{{ + ###################################################################### + Set of methods to help writing and reading everything needed for EDSP + with the notable exception of reading a scenario for conversion into + a Cache as this is handled by edsp interface for listparser and friends + ##################################################################### */ + /*}}}*/ +#ifndef PKGLIB_EDSP_H +#define PKGLIB_EDSP_H + +#include <apt-pkg/cacheset.h> +#include <apt-pkg/macros.h> +#include <apt-pkg/pkgcache.h> + +#include <cstdio> + +#include <list> +#include <string> +#include <vector> + + +class pkgDepCache; +class OpProgress; + +namespace EDSP /*{{{*/ +{ + namespace Request + { + enum Flags + { + AUTOREMOVE = (1 << 0), /*!< removal of unneeded packages should be performed */ + UPGRADE_ALL = (1 << 1), /*!< upgrade all installed packages, like 'apt-get full-upgrade' without forbid flags */ + FORBID_NEW_INSTALL = (1 << 2), /*!< forbid the resolver to install new packages */ + FORBID_REMOVE = (1 << 3), /*!< forbid the resolver to remove packages */ + }; + } + /** \brief creates the EDSP request stanza + * + * In the EDSP protocol the first thing send to the resolver is a stanza + * encoding the request. This method will write this stanza by looking at + * the given Cache and requests the installation of all packages which were + * marked for installation in it (equally for remove). + * + * \param Cache in which the request is encoded + * \param output is written to this "file" + * \param flags effecting the request documented in #EDSP::Request::Flags + * \param Progress is an instance to report progress to + * + * \return true if request was composed successfully, otherwise false + */ + APT_PUBLIC bool WriteRequest(pkgDepCache &Cache, FileFd &output, + unsigned int const flags = 0, + OpProgress *Progress = NULL); + + /** \brief creates the scenario representing the package universe + * + * After the request all known information about a package are send + * to the solver. The output looks similar to a Packages or status file + * + * All packages and version included in this Cache are send, even if + * it doesn't make sense from an APT resolver point of view like versions + * with a negative pin to enable the solver to propose even that as a + * solution or at least to be able to give a hint what can be done to + * satisfy a request. + * + * \param Cache is the known package universe + * \param output is written to this "file" + * \param Progress is an instance to report progress to + * + * \return true if universe was composed successfully, otherwise false + */ + APT_PUBLIC bool WriteScenario(pkgDepCache &Cache, FileFd &output, OpProgress *Progress = NULL); + + /** \brief creates a limited scenario representing the package universe + * + * This method works similar to #WriteScenario as it works in the same + * way but doesn't send the complete universe to the solver but only + * packages included in the pkgset which will have only dependencies + * on packages which are in the given set. All other dependencies will + * be removed, so that this method can be used to create testcases + * + * \param Cache is the known package universe + * \param output is written to this "file" + * \param pkgset is a set of packages the universe should be limited to + * \param Progress is an instance to report progress to + * + * \return true if universe was composed successfully, otherwise false + */ + APT_PUBLIC bool WriteLimitedScenario(pkgDepCache &Cache, FileFd &output, + std::vector<bool> const &pkgset, + OpProgress *Progress = NULL); + + /** \brief waits and acts on the information returned from the solver + * + * This method takes care of interpreting whatever the solver sends + * through the standard output like a solution, progress or an error. + * The main thread should hand his control over to this method to + * wait for the solver to finish the given task. The file descriptor + * used as input is completely consumed and closed by the method. + * + * \param input file descriptor with the response from the solver + * \param Cache the solution should be applied on if any + * \param Progress is an instance to report progress to + * + * \return true if a solution is found and applied correctly, otherwise false + */ + APT_PUBLIC bool ReadResponse(int const input, pkgDepCache &Cache, OpProgress *Progress = NULL); + + /** \brief search and read the request stanza for action later + * + * This method while ignore the input up to the point it finds the + * Request: line as an indicator for the Request stanza. + * The request is stored in the parameters install and remove then, + * as the cache isn't build yet as the scenario follows the request. + * + * \param input file descriptor with the edsp input for the solver + * \param[out] install is a list which gets populated with requested installs + * \param[out] remove is a list which gets populated with requested removals + * \param[out] upgrade is true if it is a request like apt-get upgrade + * \param[out] distUpgrade is true if it is a request like apt-get dist-upgrade + * \param[out] autoRemove is true if removal of unneeded packages should be performed + * + * \return true if the request could be found and worked on, otherwise false + */ + APT_PUBLIC bool ReadRequest(int const input, std::list<std::string> &install, + std::list<std::string> &remove, unsigned int &flags); + + /** \brief takes the request lists and applies it on the cache + * + * The lists as created by #ReadRequest will be used to find the + * packages in question and mark them for install/remove. + * No solving is done and no auto-install/-remove. + * + * \param install is a list of packages to mark for installation + * \param remove is a list of packages to mark for removal + * \param Cache is there the markers should be set + * + * \return false if the request couldn't be applied, true otherwise + */ + APT_PUBLIC bool ApplyRequest(std::list<std::string> const &install, + std::list<std::string> const &remove, + pkgDepCache &Cache); + + /** \brief formats a solution stanza for the given version + * + * EDSP uses a simple format for reporting solutions: + * A single required field name with an ID as value. + * Additional fields might appear as debug aids. + * + * \param output to write the stanza forming the solution to + * \param Type of the stanza, used as field name + * \param Ver this stanza applies to + * + * \return true if stanza could be written, otherwise false + */ + APT_PUBLIC bool WriteSolutionStanza(FileFd &output, char const * const Type, pkgCache::VerIterator const &Ver); + + /** \brief sends a progress report + * + * \param percent of the solving completed + * \param message the solver wants the user to see + * \param output the front-end listens for progress report + */ + APT_PUBLIC bool WriteProgress(unsigned short const percent, const char* const message, FileFd &output); + + /** \brief sends an error report + * + * Solvers are expected to execute successfully even if + * they were unable to calculate a solution for a given task. + * Obviously they can't send a solution through, so this + * methods deals with formatting an error message correctly + * so that the front-ends can receive and display it. + * + * The first line of the message should be a short description + * of the error so it can be used for dialog titles or alike + * + * \param uuid of this error message + * \param message is free form text to describe the error + * \param output the front-end listens for error messages + */ + APT_PUBLIC bool WriteError(char const * const uuid, std::string const &message, FileFd &output); + + + /** \brief executes the given solver and returns the pipe ends + * + * The given solver is executed if it can be found in one of the + * configured directories and setup for it is performed. + * + * \param solver to execute + * \param[out] solver_in will be the stdin of the solver + * \param[out] solver_out will be the stdout of the solver + * + * \return PID of the started solver or 0 if failure occurred + */ + APT_PUBLIC pid_t ExecuteSolver(const char* const solver, int * const solver_in, int * const solver_out, bool /*overload*/); + + /** \brief call an external resolver to handle the request + * + * This method wraps all the methods above to call an external solver + * + * \param solver to execute + * \param Cache with the problem and as universe to work in + * \param flags effecting the request documented in #EDSP::Request::Flags + * \param Progress is an instance to report progress to + * + * \return true if the solver has successfully solved the problem, + * otherwise false + */ + APT_PUBLIC bool ResolveExternal(const char* const solver, pkgDepCache &Cache, + unsigned int const flags = 0, + OpProgress *Progress = NULL); +} + /*}}}*/ +class pkgPackageManager; +namespace EIPP /*{{{*/ +{ + namespace Request + { + enum Flags + { + IMMEDIATE_CONFIGURATION_ALL = (1 << 0), /*!< try to keep the least amount of packages unconfigured as possible at all times */ + NO_IMMEDIATE_CONFIGURATION = (1 << 1), /*!< do not perform immediate configuration at all */ + ALLOW_TEMPORARY_REMOVE_OF_ESSENTIALS = (1 << 2), /*!< just as the name suggests, very special case and dangerous! */ + }; + } + + APT_HIDDEN bool WriteRequest(pkgDepCache &Cache, FileFd &output, + unsigned int const flags, OpProgress * const Progress); + APT_HIDDEN bool WriteScenario(pkgDepCache &Cache, FileFd &output, + OpProgress * const Progress); + + APT_HIDDEN bool OrderInstall(char const * const planner, pkgPackageManager * const PM, + unsigned int const version, OpProgress * const Progress); + APT_HIDDEN bool ReadResponse(int const input, pkgPackageManager * const PM, + OpProgress * const Progress); + + enum class PKG_ACTION + { + NOOP, + INSTALL, + REINSTALL, + REMOVE + }; + APT_PUBLIC bool ReadRequest(int const input, + std::list<std::pair<std::string,PKG_ACTION>> &actions, + unsigned int &flags); + APT_PUBLIC bool ApplyRequest(std::list<std::pair<std::string,PKG_ACTION>> &actions, + pkgDepCache &Cache); +} + /*}}}*/ +#endif |