cmdline/apt-dump-solver.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 /* #####################################################################
   4
   5    dummy solver to get quickly a scenario file out of APT
   6
   7    ##################################################################### */
   8                                                                         /*}}}*/
   9 // Include Files                                                        /*{{{*/
  10 #include <apt-pkg/edsp.h>
  11
  12 #include <string.h>
  13 #include <unistd.h>
  14 #include <cstdio>
  15 #include <iostream>
  16 #include <sstream>
  17
  18 #include <config.h>
  19                                                                         /*}}}*/
  20
  21 // ShowHelp - Show a help screen                                        /*{{{*/
  22 // ---------------------------------------------------------------------
  23 /* */
  24 static bool ShowHelp() {
  25         ioprintf(std::cout, "%s %s (%s)\n", PACKAGE, PACKAGE_VERSION, COMMON_ARCH);
  26         std::cout <<
  27                 "Usage: apt-dump-solver\n"
  28                 "\n"
  29                 "apt-dump-solver is a dummy solver who just dumps its input to the\n"
  30                 "file specified in the environment variable APT_EDSP_DUMP_FILENAME and\n"
  31                 "exists with a proper EDSP error.\n"
  32                 "\n"
  33                 "                       This dump has lost Super Cow Powers.\n";
  34         return true;
  35 }
  36                                                                         /*}}}*/
  37 int main(int argc,const char *argv[])                                   /*{{{*/
  38 {
  39         if (argc > 1 && (strcmp(argv[1], "--help") == 0 || strcmp(argv[1],"-h") == 0 ||
  40             strcmp(argv[1],"-v") == 0 || strcmp(argv[1],"--version") == 0)) {
  41                 ShowHelp();
  42                 return 0;
  43         }
  44
  45         // we really don't need anything
  46         DropPrivileges();
  47         char const * const filename = getenv("APT_EDSP_DUMP_FILENAME");
  48         if (filename == NULL || strlen(filename) == 0)
  49         {
  50            EDSP::WriteError("ERR_NO_FILENAME", "You have to set the environment variable APT_EDSP_DUMP_FILENAME\n"
  51                  "to a valid filename to store the dump of EDSP solver input in.\n"
  52                  "For example with: export APT_EDSP_DUMP_FILENAME=/tmp/dump.edsp", stdout);
  53            return 0;
  54         }
  55
  56         unlink(filename);
  57         FileFd input, output;
  58         if (input.OpenDescriptor(STDIN_FILENO, FileFd::ReadOnly) == false ||
  59               output.Open(filename, FileFd::WriteOnly | FileFd::Create | FileFd::Exclusive, 0600) == false ||
  60               CopyFile(input, output) == false || input.Close() == false || output.Close() == false)
  61         {
  62            std::ostringstream out;
  63            out << "Writing EDSP solver input to file '" << filename << "' failed!\n";
  64            _error->DumpErrors(out);
  65            EDSP::WriteError("ERR_WRITE_ERROR", out.str(), stdout);
  66            return 0;
  67         }
  68
  69         EDSP::WriteError("ERR_JUST_DUMPING", "I am too dumb, i can just dump!\nPlease use one of my friends instead!", stdout);
  70         return 0;
  71 }