cmdline/apt-internal-solver.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 /* #####################################################################
   4
   5    cover around the internal solver to be able to run it like an external
   6
   7    ##################################################################### */
   8                                                                         /*}}}*/
   9 // Include Files                                                        /*{{{*/
  10 #include <config.h>
  11
  12 #include <apt-pkg/error.h>
  13 #include <apt-pkg/cmndline.h>
  14 #include <apt-pkg/init.h>
  15 #include <apt-pkg/cachefile.h>
  16 #include <apt-pkg/cacheset.h>
  17 #include <apt-pkg/strutl.h>
  18 #include <apt-pkg/edsp.h>
  19 #include <apt-pkg/algorithms.h>
  20 #include <apt-pkg/fileutl.h>
  21 #include <apt-pkg/pkgsystem.h>
  22 #include <apt-pkg/upgrade.h>
  23 #include <apt-pkg/configuration.h>
  24 #include <apt-pkg/depcache.h>
  25 #include <apt-pkg/pkgcache.h>
  26 #include <apt-pkg/cacheiterators.h>
  27
  28 #include <apt-private/private-output.h>
  29 #include <apt-private/private-cmndline.h>
  30
  31 #include <string.h>
  32 #include <iostream>
  33 #include <sstream>
  34 #include <list>
  35 #include <string>
  36 #include <unistd.h>
  37 #include <cstdio>
  38 #include <stdlib.h>
  39
  40 #include <apti18n.h>
  41                                                                         /*}}}*/
  42
  43 // ShowHelp - Show a help screen                                        /*{{{*/
  44 // ---------------------------------------------------------------------
  45 /* */
  46 static bool ShowHelp(CommandLine &) {
  47         ioprintf(std::cout, "%s %s (%s)\n", PACKAGE, PACKAGE_VERSION, COMMON_ARCH);
  48
  49         std::cout <<
  50                 _("Usage: apt-internal-solver\n"
  51                 "\n"
  52                 "apt-internal-solver is an interface to use the current internal\n"
  53                 "like an external resolver for the APT family for debugging or alike\n"
  54                 "\n"
  55                 "Options:\n"
  56                 "  -h  This help text.\n"
  57                 "  -q  Loggable output - no progress indicator\n"
  58                 "  -c=? Read this configuration file\n"
  59                 "  -o=? Set an arbitrary configuration option, eg -o dir::cache=/tmp\n");
  60         return true;
  61 }
  62                                                                         /*}}}*/
  63 APT_NORETURN static void DIE(std::string const &message) {              /*{{{*/
  64         std::cerr << "ERROR: " << message << std::endl;
  65         _error->DumpErrors(std::cerr);
  66         exit(EXIT_FAILURE);
  67 }
  68                                                                         /*}}}*/
  69 int main(int argc,const char *argv[])                                   /*{{{*/
  70 {
  71         CommandLine::Args Args[] = {
  72                 {'h',"help","help",0},
  73                 {'v',"version","version",0},
  74                 {'q',"quiet","quiet",CommandLine::IntLevel},
  75                 {'q',"silent","quiet",CommandLine::IntLevel},
  76                 {'c',"config-file",0,CommandLine::ConfigFile},
  77                 {'o',"option",0,CommandLine::ArbItem},
  78                 {0,0,0,0}};
  79
  80         // we really don't need anything
  81         DropPrivileges();
  82
  83         CommandLine CmdL;
  84         ParseCommandLine(CmdL, NULL, Args, &_config, NULL, argc, argv, ShowHelp);
  85
  86         if (CmdL.FileList[0] != 0 && strcmp(CmdL.FileList[0], "scenario") == 0)
  87         {
  88                 if (pkgInitSystem(*_config,_system) == false) {
  89                         std::cerr << "System could not be initialized!" << std::endl;
  90                         return 1;
  91                 }
  92                 pkgCacheFile CacheFile;
  93                 CacheFile.Open(NULL, false);
  94                 APT::PackageSet pkgset = APT::PackageSet::FromCommandLine(CacheFile, CmdL.FileList + 1);
  95                 FILE* output = stdout;
  96                 if (pkgset.empty() == true)
  97                         EDSP::WriteScenario(CacheFile, output);
  98                 else
  99                         EDSP::WriteLimitedScenario(CacheFile, output, pkgset);
 100                 fclose(output);
 101                 _error->DumpErrors(std::cerr);
 102                 return 0;
 103         }
 104
 105         // Deal with stdout not being a tty
 106         if (!isatty(STDOUT_FILENO) && _config->FindI("quiet", -1) == -1)
 107                 _config->Set("quiet","1");
 108
 109         if (_config->FindI("quiet", 0) < 1)
 110                 _config->Set("Debug::EDSP::WriteSolution", true);
 111
 112         _config->Set("APT::System", "Debian APT solver interface");
 113         _config->Set("APT::Solver", "internal");
 114         _config->Set("edsp::scenario", "/nonexistent/stdin");
 115         int input = STDIN_FILENO;
 116         FILE* output = stdout;
 117         SetNonBlock(input, false);
 118
 119         EDSP::WriteProgress(0, "Start up solver…", output);
 120
 121         if (pkgInitSystem(*_config,_system) == false)
 122                 DIE("System could not be initialized!");
 123
 124         EDSP::WriteProgress(1, "Read request…", output);
 125
 126         if (WaitFd(input, false, 5) == false)
 127                 DIE("WAIT timed out in the resolver");
 128
 129         std::list<std::string> install, remove;
 130         bool upgrade, distUpgrade, autoRemove;
 131         if (EDSP::ReadRequest(input, install, remove, upgrade, distUpgrade, autoRemove) == false)
 132                 DIE("Parsing the request failed!");
 133
 134         EDSP::WriteProgress(5, "Read scenario…", output);
 135
 136         pkgCacheFile CacheFile;
 137         if (CacheFile.Open(NULL, false) == false)
 138                 DIE("Failed to open CacheFile!");
 139
 140         EDSP::WriteProgress(50, "Apply request on scenario…", output);
 141
 142         if (EDSP::ApplyRequest(install, remove, CacheFile) == false)
 143                 DIE("Failed to apply request to depcache!");
 144
 145         pkgProblemResolver Fix(CacheFile);
 146         for (std::list<std::string>::const_iterator i = remove.begin();
 147              i != remove.end(); ++i) {
 148                 pkgCache::PkgIterator P = CacheFile->FindPkg(*i);
 149                 Fix.Clear(P);
 150                 Fix.Protect(P);
 151                 Fix.Remove(P);
 152         }
 153
 154         for (std::list<std::string>::const_iterator i = install.begin();
 155              i != install.end(); ++i) {
 156                 pkgCache::PkgIterator P = CacheFile->FindPkg(*i);
 157                 Fix.Clear(P);
 158                 Fix.Protect(P);
 159         }
 160
 161         for (std::list<std::string>::const_iterator i = install.begin();
 162              i != install.end(); ++i)
 163                 CacheFile->MarkInstall(CacheFile->FindPkg(*i), true);
 164
 165         EDSP::WriteProgress(60, "Call problemresolver on current scenario…", output);
 166
 167         std::string failure;
 168         if (upgrade == true) {
 169                 if (APT::Upgrade::Upgrade(CacheFile, APT::Upgrade::FORBID_REMOVE_PACKAGES | APT::Upgrade::FORBID_INSTALL_NEW_PACKAGES) == false)
 170                         failure = "ERR_UNSOLVABLE_UPGRADE";
 171         } else if (distUpgrade == true) {
 172                 if (APT::Upgrade::Upgrade(CacheFile, APT::Upgrade::ALLOW_EVERYTHING) == false)
 173                         failure = "ERR_UNSOLVABLE_DIST_UPGRADE";
 174         } else if (Fix.Resolve() == false)
 175                 failure = "ERR_UNSOLVABLE";
 176
 177         if (failure.empty() == false) {
 178                 std::ostringstream broken;
 179                 ShowBroken(broken, CacheFile, false);
 180                 EDSP::WriteError(failure.c_str(), broken.str(), output);
 181                 return 0;
 182         }
 183
 184         EDSP::WriteProgress(95, "Write solution…", output);
 185
 186         if (EDSP::WriteSolution(CacheFile, output) == false)
 187                 DIE("Failed to output the solution!");
 188
 189         EDSP::WriteProgress(100, "Done", output);
 190
 191         bool const Errors = _error->PendingError();
 192         if (_config->FindI("quiet",0) > 0)
 193                 _error->DumpErrors(std::cerr);
 194         else
 195                 _error->DumpErrors(std::cerr, GlobalError::DEBUG);
 196         return Errors == true ? 100 : 0;
 197 }
 198                                                                         /*}}}*/