apt-pkg/edsp.h

   1 // -*- mode: cpp; mode: fold -*-
   2 /** Description \file edsp.h                                            {{{
   3    ######################################################################
   4    Set of methods to help writing and reading everything needed for EDSP
   5    with the notable exception of reading a scenario for conversion into
   6    a Cache as this is handled by edsp interface for listparser and friends
   7    ##################################################################### */
   8                                                                         /*}}}*/
   9 #ifndef PKGLIB_EDSP_H
  10 #define PKGLIB_EDSP_H
  11
  12 #include <apt-pkg/cacheset.h>
  13 #include <apt-pkg/pkgcache.h>
  14 #include <apt-pkg/cacheiterators.h>
  15 #include <apt-pkg/macros.h>
  16
  17 #include <stdio.h>
  18
  19 #include <list>
  20 #include <string>
  21 #include <vector>
  22
  23 #ifndef APT_8_CLEANER_HEADERS
  24 #include <apt-pkg/depcache.h>
  25 #include <apt-pkg/progress.h>
  26 #endif
  27
  28 class pkgDepCache;
  29 class OpProgress;
  30
  31 namespace EDSP                                                          /*{{{*/
  32 {
  33         namespace Request
  34         {
  35            enum Flags
  36            {
  37               AUTOREMOVE = (1 << 0), /*!< removal of unneeded packages should be performed */
  38               UPGRADE_ALL = (1 << 1), /*!< upgrade all installed packages, like 'apt-get full-upgrade' without forbid flags */
  39               FORBID_NEW_INSTALL = (1 << 2), /*!< forbid the resolver to install new packages */
  40               FORBID_REMOVE = (1 << 3), /*!< forbid the resolver to remove packages */
  41            };
  42         }
  43         /** \brief creates the EDSP request stanza
  44          *
  45          *  In the EDSP protocol the first thing send to the resolver is a stanza
  46          *  encoding the request. This method will write this stanza by looking at
  47          *  the given Cache and requests the installation of all packages which were
  48          *  marked for installation in it (equally for remove).
  49          *
  50          *  \param Cache in which the request is encoded
  51          *  \param output is written to this "file"
  52          *  \param flags effecting the request documented in #EDSP::Request::Flags
  53          *  \param Progress is an instance to report progress to
  54          *
  55          *  \return true if request was composed successfully, otherwise false
  56          */
  57         bool WriteRequest(pkgDepCache &Cache, FileFd &output,
  58                                  unsigned int const flags = 0,
  59                                 OpProgress *Progress = NULL);
  60         bool WriteRequest(pkgDepCache &Cache, FILE* output,
  61                                  bool const upgrade = false,
  62                                  bool const distUpgrade = false,
  63                                  bool const autoRemove = false,
  64                                 OpProgress *Progress = NULL) APT_DEPRECATED_MSG("Use FileFd-based interface instead");
  65
  66         /** \brief creates the scenario representing the package universe
  67          *
  68          *  After the request all known information about a package are send
  69          *  to the solver. The output looks similar to a Packages or status file
  70          *
  71          *  All packages and version included in this Cache are send, even if
  72          *  it doesn't make sense from an APT resolver point of view like versions
  73          *  with a negative pin to enable the solver to propose even that as a
  74          *  solution or at least to be able to give a hint what can be done to
  75          *  statisfy a request.
  76          *
  77          *  \param Cache is the known package universe
  78          *  \param output is written to this "file"
  79          *  \param Progress is an instance to report progress to
  80          *
  81          *  \return true if universe was composed successfully, otherwise false
  82          */
  83         bool WriteScenario(pkgDepCache &Cache, FileFd &output, OpProgress *Progress = NULL);
  84         bool WriteScenario(pkgDepCache &Cache, FILE* output, OpProgress *Progress = NULL) APT_DEPRECATED_MSG("Use FileFd-based interface instead");
  85
  86         /** \brief creates a limited scenario representing the package universe
  87          *
  88          *  This method works similar to #WriteScenario as it works in the same
  89          *  way but doesn't send the complete universe to the solver but only
  90          *  packages included in the pkgset which will have only dependencies
  91          *  on packages which are in the given set. All other dependencies will
  92          *  be removed, so that this method can be used to create testcases
  93          *
  94          *  \param Cache is the known package universe
  95          *  \param output is written to this "file"
  96          *  \param pkgset is a set of packages the universe should be limited to
  97          *  \param Progress is an instance to report progress to
  98          *
  99          *  \return true if universe was composed successfully, otherwise false
 100          */
 101         bool WriteLimitedScenario(pkgDepCache &Cache, FileFd &output,
 102                                          std::vector<bool> const &pkgset,
 103                                          OpProgress *Progress = NULL);
 104         bool WriteLimitedScenario(pkgDepCache &Cache, FILE* output,
 105                                          APT::PackageSet const &pkgset,
 106                                          OpProgress *Progress = NULL) APT_DEPRECATED_MSG("Use FileFd-based interface instead");
 107
 108         /** \brief waits and acts on the information returned from the solver
 109          *
 110          *  This method takes care of interpreting whatever the solver sends
 111          *  through the standard output like a solution, progress or an error.
 112          *  The main thread should handle his control over to this method to
 113          *  wait for the solver to finish the given task
 114          *
 115          *  \param input file descriptor with the response from the solver
 116          *  \param Cache the solution should be applied on if any
 117          *  \param Progress is an instance to report progress to
 118          *
 119          *  \return true if a solution is found and applied correctly, otherwise false
 120          */
 121         bool ReadResponse(int const input, pkgDepCache &Cache, OpProgress *Progress = NULL);
 122
 123         /** \brief search and read the request stanza for action later
 124          *
 125          *  This method while ignore the input up to the point it finds the
 126          *  Request: line as an indicator for the Request stanza.
 127          *  The request is stored in the parameters install and remove then,
 128          *  as the cache isn't build yet as the scenario follows the request.
 129          *
 130          *  \param input file descriptor with the edsp input for the solver
 131          *  \param[out] install is a list which gets populated with requested installs
 132          *  \param[out] remove is a list which gets populated with requested removals
 133          *  \param[out] upgrade is true if it is a request like apt-get upgrade
 134          *  \param[out] distUpgrade is true if it is a request like apt-get dist-upgrade
 135          *  \param[out] autoRemove is true if removal of uneeded packages should be performed
 136          *
 137          *  \return true if the request could be found and worked on, otherwise false
 138          */
 139         bool ReadRequest(int const input, std::list<std::string> &install,
 140                         std::list<std::string> &remove, unsigned int &flags);
 141         APT_DEPRECATED_MSG("use the flag-based version instead") bool ReadRequest(int const input, std::list<std::string> &install,
 142                         std::list<std::string> &remove, bool &upgrade,
 143                         bool &distUpgrade, bool &autoRemove);
 144
 145         /** \brief takes the request lists and applies it on the cache
 146          *
 147          *  The lists as created by #ReadRequest will be used to find the
 148          *  packages in question and mark them for install/remove.
 149          *  No solving is done and no auto-install/-remove.
 150          *
 151          *  \param install is a list of packages to mark for installation
 152          *  \param remove is a list of packages to mark for removal
 153          *  \param Cache is there the markers should be set
 154          *
 155          *  \return false if the request couldn't be applied, true otherwise
 156          */
 157         bool ApplyRequest(std::list<std::string> const &install,
 158                                  std::list<std::string> const &remove,
 159                                  pkgDepCache &Cache);
 160
 161         /** \brief formats a solution stanza for the given version
 162          *
 163          *  EDSP uses a simple format for reporting solutions:
 164          *  A single required field name with an ID as value.
 165          *  Additional fields might appear as debug aids.
 166          *
 167          *  \param output to write the stanza forming the solution to
 168          *  \param Type of the stanza, used as field name
 169          *  \param Ver this stanza applies to
 170          *
 171          *  \return true if stanza could be written, otherwise false
 172          */
 173         bool WriteSolutionStanza(FileFd &output, char const * const Type, pkgCache::VerIterator const &Ver);
 174         bool WriteSolution(pkgDepCache &Cache, FILE* output) APT_DEPRECATED_MSG("Use FileFd-based single-stanza interface instead");
 175
 176         /** \brief sends a progress report
 177          *
 178          *  \param percent of the solving completed
 179          *  \param message the solver wants the user to see
 180          *  \param output the front-end listens for progress report
 181          */
 182         bool WriteProgress(unsigned short const percent, const char* const message, FileFd &output);
 183         bool WriteProgress(unsigned short const percent, const char* const message, FILE* output) APT_DEPRECATED_MSG("Use FileFd-based interface instead");
 184
 185         /** \brief sends an error report
 186          *
 187          *  Solvers are expected to execute successfully even if
 188          *  they were unable to calculate a solution for a given task.
 189          *  Obviously they can't send a solution through, so this
 190          *  methods deals with formatting an error message correctly
 191          *  so that the front-ends can receive and display it.
 192          *
 193          *  The first line of the message should be a short description
 194          *  of the error so it can be used for dialog titles or alike
 195          *
 196          *  \param uuid of this error message
 197          *  \param message is free form text to describe the error
 198          *  \param output the front-end listens for error messages
 199          */
 200         bool WriteError(char const * const uuid, std::string const &message, FileFd &output);
 201         bool WriteError(char const * const uuid, std::string const &message, FILE* output) APT_DEPRECATED_MSG("Use FileFd-based interface instead");
 202
 203
 204         /** \brief executes the given solver and returns the pipe ends
 205          *
 206          *  The given solver is executed if it can be found in one of the
 207          *  configured directories and setup for it is performed.
 208          *
 209          *  \param solver to execute
 210          *  \param[out] solver_in will be the stdin of the solver
 211          *  \param[out] solver_out will be the stdout of the solver
 212          *
 213          *  \return PID of the started solver or 0 if failure occurred
 214          */
 215         pid_t ExecuteSolver(const char* const solver, int * const solver_in, int * const solver_out, bool /*overload*/);
 216         APT_DEPRECATED_MSG("add a dummy bool parameter to use the overload returning a pid_t") bool ExecuteSolver(const char* const solver, int *solver_in, int *solver_out);
 217
 218         /** \brief call an external resolver to handle the request
 219          *
 220          *  This method wraps all the methods above to call an external solver
 221          *
 222          *  \param solver to execute
 223          *  \param Cache with the problem and as universe to work in
 224          *  \param flags effecting the request documented in #EDSP::Request::Flags
 225          *  \param Progress is an instance to report progress to
 226          *
 227          *  \return true if the solver has successfully solved the problem,
 228          *  otherwise false
 229          */
 230         bool ResolveExternal(const char* const solver, pkgDepCache &Cache,
 231                                     unsigned int const flags = 0,
 232                                     OpProgress *Progress = NULL);
 233         APT_DEPRECATED_MSG("use the flag-based version instead") bool ResolveExternal(const char* const solver, pkgDepCache &Cache,
 234                                     bool const upgrade, bool const distUpgrade,
 235                                     bool const autoRemove, OpProgress *Progress = NULL);
 236 }
 237                                                                         /*}}}*/
 238 #endif