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 #include <apt-private/private-output.h>
  28
  29 #include <string.h>
  30 #include <iostream>
  31 #include <sstream>
  32 #include <list>
  33 #include <string>
  34 #include <unistd.h>
  35 #include <cstdio>
  36 #include <stdlib.h>
  37
  38 #include <apti18n.h>
  39                                                                         /*}}}*/
  40
  41 // ShowHelp - Show a help screen                                        /*{{{*/
  42 // ---------------------------------------------------------------------
  43 /* */
  44 static bool ShowHelp(CommandLine &) {
  45         ioprintf(std::cout,_("%s %s for %s compiled on %s %s\n"),PACKAGE,PACKAGE_VERSION,
  46                  COMMON_ARCH,__DATE__,__TIME__);
  47
  48         std::cout <<
  49                 _("Usage: apt-internal-solver\n"
  50                 "\n"
  51                 "apt-internal-solver is an interface to use the current internal\n"
  52                 "like an external resolver for the APT family for debugging or alike\n"
  53                 "\n"
  54                 "Options:\n"
  55                 "  -h  This help text.\n"
  56                 "  -q  Loggable output - no progress indicator\n"
  57                 "  -c=? Read this configuration file\n"
  58                 "  -o=? Set an arbitrary configuration option, eg -o dir::cache=/tmp\n");
  59         return true;
  60 }
  61                                                                         /*}}}*/
  62 APT_NORETURN static void DIE(std::string const &message) {              /*{{{*/
  63         std::cerr << "ERROR: " << message << std::endl;
  64         _error->DumpErrors(std::cerr);
  65         exit(EXIT_FAILURE);
  66 }
  67                                                                         /*}}}*/
  68 int main(int argc,const char *argv[])                                   /*{{{*/
  69 {
  70         CommandLine::Args Args[] = {
  71                 {'h',"help","help",0},
  72                 {'v',"version","version",0},
  73                 {'q',"quiet","quiet",CommandLine::IntLevel},
  74                 {'q',"silent","quiet",CommandLine::IntLevel},
  75                 {'c',"config-file",0,CommandLine::ConfigFile},
  76                 {'o',"option",0,CommandLine::ArbItem},
  77                 {0,0,0,0}};
  78
  79         // we really don't need anything
  80         DropPrivs();
  81
  82         CommandLine CmdL(Args,_config);
  83         if (pkgInitConfig(*_config) == false ||
  84             CmdL.Parse(argc,argv) == false) {
  85                 _error->DumpErrors();
  86                 return 2;
  87         }
  88
  89         // See if the help should be shown
  90         if (_config->FindB("help") == true ||
  91             _config->FindB("version") == true) {
  92                 ShowHelp(CmdL);
  93                 return 1;
  94         }
  95
  96         if (CmdL.FileList[0] != 0 && strcmp(CmdL.FileList[0], "scenario") == 0)
  97         {
  98                 if (pkgInitSystem(*_config,_system) == false) {
  99                         std::cerr << "System could not be initialized!" << std::endl;
 100                         return 1;
 101                 }
 102                 pkgCacheFile CacheFile;
 103                 CacheFile.Open(NULL, false);
 104                 APT::PackageSet pkgset = APT::PackageSet::FromCommandLine(CacheFile, CmdL.FileList + 1);
 105                 FILE* output = stdout;
 106                 if (pkgset.empty() == true)
 107                         EDSP::WriteScenario(CacheFile, output);
 108                 else
 109                         EDSP::WriteLimitedScenario(CacheFile, output, pkgset);
 110                 fclose(output);
 111                 _error->DumpErrors(std::cerr);
 112                 return 0;
 113         }
 114
 115         // Deal with stdout not being a tty
 116         if (!isatty(STDOUT_FILENO) && _config->FindI("quiet", -1) == -1)
 117                 _config->Set("quiet","1");
 118
 119         if (_config->FindI("quiet", 0) < 1)
 120                 _config->Set("Debug::EDSP::WriteSolution", true);
 121
 122         _config->Set("APT::Solver", "internal");
 123         _config->Set("edsp::scenario", "stdin");
 124         int input = STDIN_FILENO;
 125         FILE* output = stdout;
 126         SetNonBlock(input, false);
 127
 128         EDSP::WriteProgress(0, "Start up solver…", output);
 129
 130         if (pkgInitSystem(*_config,_system) == false)
 131                 DIE("System could not be initialized!");
 132
 133         EDSP::WriteProgress(1, "Read request…", output);
 134
 135         if (WaitFd(input, false, 5) == false)
 136                 DIE("WAIT timed out in the resolver");
 137
 138         std::list<std::string> install, remove;
 139         bool upgrade, distUpgrade, autoRemove;
 140         if (EDSP::ReadRequest(input, install, remove, upgrade, distUpgrade, autoRemove) == false)
 141                 DIE("Parsing the request failed!");
 142
 143         EDSP::WriteProgress(5, "Read scenario…", output);
 144
 145         pkgCacheFile CacheFile;
 146         if (CacheFile.Open(NULL, false) == false)
 147                 DIE("Failed to open CacheFile!");
 148
 149         EDSP::WriteProgress(50, "Apply request on scenario…", output);
 150
 151         if (EDSP::ApplyRequest(install, remove, CacheFile) == false)
 152                 DIE("Failed to apply request to depcache!");
 153
 154         pkgProblemResolver Fix(CacheFile);
 155         for (std::list<std::string>::const_iterator i = remove.begin();
 156              i != remove.end(); ++i) {
 157                 pkgCache::PkgIterator P = CacheFile->FindPkg(*i);
 158                 Fix.Clear(P);
 159                 Fix.Protect(P);
 160                 Fix.Remove(P);
 161         }
 162
 163         for (std::list<std::string>::const_iterator i = install.begin();
 164              i != install.end(); ++i) {
 165                 pkgCache::PkgIterator P = CacheFile->FindPkg(*i);
 166                 Fix.Clear(P);
 167                 Fix.Protect(P);
 168         }
 169
 170         for (std::list<std::string>::const_iterator i = install.begin();
 171              i != install.end(); ++i)
 172                 CacheFile->MarkInstall(CacheFile->FindPkg(*i), true);
 173
 174         EDSP::WriteProgress(60, "Call problemresolver on current scenario…", output);
 175
 176         std::string failure;
 177         if (upgrade == true) {
 178                 if (APT::Upgrade::Upgrade(CacheFile, APT::Upgrade::FORBID_REMOVE_PACKAGES | APT::Upgrade::FORBID_INSTALL_NEW_PACKAGES) == false)
 179                         failure = "ERR_UNSOLVABLE_UPGRADE";
 180         } else if (distUpgrade == true) {
 181                 if (APT::Upgrade::Upgrade(CacheFile, APT::Upgrade::ALLOW_EVERYTHING) == false)
 182                         failure = "ERR_UNSOLVABLE_DIST_UPGRADE";
 183         } else if (Fix.Resolve() == false)
 184                 failure = "ERR_UNSOLVABLE";
 185
 186         if (failure.empty() == false) {
 187                 std::ostringstream broken;
 188                 ShowBroken(broken, CacheFile, false);
 189                 EDSP::WriteError(failure.c_str(), broken.str(), output);
 190                 return 0;
 191         }
 192
 193         EDSP::WriteProgress(95, "Write solution…", output);
 194
 195         if (EDSP::WriteSolution(CacheFile, output) == false)
 196                 DIE("Failed to output the solution!");
 197
 198         EDSP::WriteProgress(100, "Done", output);
 199
 200         bool const Errors = _error->PendingError();
 201         if (_config->FindI("quiet",0) > 0)
 202                 _error->DumpErrors(std::cerr);
 203         else
 204                 _error->DumpErrors(std::cerr, GlobalError::DEBUG);
 205         return Errors == true ? 100 : 0;
 206 }
 207                                                                         /*}}}*/