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