add a small wrapper to use the internal apt solver as an external one

[ntk/apt.git] / cmdline / apt-internal-solver.cc

diff --git a/cmdline/apt-internal-solver.cc b/cmdline/apt-internal-solver.cc
new file mode 100644 (file)
index 0000000..83d79e4
--- /dev/null
+++ b/cmdline/apt-internal-solver.cc
@@ -0,0 +1,129 @@
+// -*- mode: cpp; mode: fold -*-
+// Description                                                         /*{{{*/
+/* #####################################################################
+
+   cover around the internal solver to be able to run it like an external
+
+   ##################################################################### */
+                                                                       /*}}}*/
+// Include Files                                                       /*{{{*/
+#include <apt-pkg/error.h>
+#include <apt-pkg/cmndline.h>
+#include <apt-pkg/init.h>
+#include <apt-pkg/cachefile.h>
+#include <apt-pkg/strutl.h>
+#include <apt-pkg/edsp.h>
+#include <apt-pkg/algorithms.h>
+#include <apt-pkg/fileutl.h>
+
+#include <config.h>
+#include <apti18n.h>
+
+#include <unistd.h>
+#include <cstdio>
+                                                                       /*}}}*/
+
+// ShowHelp - Show a help screen                                       /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool ShowHelp(CommandLine &CmdL) {
+       ioprintf(std::cout,_("%s %s for %s compiled on %s %s\n"),PACKAGE,VERSION,
+                COMMON_ARCH,__DATE__,__TIME__);
+
+       std::cout <<
+               _("Usage: apt-internal-resolver\n"
+               "\n"
+               "apt-internal-resolver is an interface to use the current internal\n"
+               "like an external resolver for the APT family for debugging or alike\n"
+               "\n"
+               "Options:\n"
+               "  -h  This help text.\n"
+               "  -q  Loggable output - no progress indicator\n"
+               "  -c=? Read this configuration file\n"
+               "  -o=? Set an arbitrary configuration option, eg -o dir::cache=/tmp\n"
+               "apt.conf(5) manual pages for more information and options.\n"
+               "                       This APT has Super Cow Powers.\n");
+       return true;
+}
+                                                                       /*}}}*/
+int main(int argc,const char *argv[])                                  /*{{{*/
+{
+       CommandLine::Args Args[] = {
+               {'h',"help","help",0},
+               {'v',"version","version",0},
+               {'q',"quiet","quiet",CommandLine::IntLevel},
+               {'q',"silent","quiet",CommandLine::IntLevel},
+               {0,0,0,0}};
+
+       CommandLine CmdL(Args,_config);
+       if (pkgInitConfig(*_config) == false ||
+           CmdL.Parse(argc,argv) == false) {
+               _error->DumpErrors();
+               return 2;
+       }
+
+       // See if the help should be shown
+       if (_config->FindB("help") == true ||
+           _config->FindB("version") == true) {
+               ShowHelp(CmdL);
+               return 1;
+       }
+
+       // Deal with stdout not being a tty
+       if (!isatty(STDOUT_FILENO) && _config->FindI("quiet", -1) == -1)
+               _config->Set("quiet","1");
+
+       if (_config->FindI("quiet", 0) < 1)
+               _config->Set("Debug::EDSP::WriteSolution", true);
+
+       _config->Set("APT::Solver::Name", "internal");
+       _config->Set("edsp::scenario", "stdin");
+       int input = STDIN_FILENO;
+       FILE* output = stdout;
+       SetNonBlock(input, false);
+
+       if (pkgInitSystem(*_config,_system) == false) {
+               std::cerr << "System could not be initialized!" << std::endl;
+               return 1;
+       }
+
+       if (WaitFd(input, false, 5) == false)
+               std::cerr << "WAIT timed out in the resolver" << std::endl;
+
+       std::list<std::string> install, remove;
+       bool upgrade, distUpgrade, autoRemove;
+       if (EDSP::ReadRequest(input, install, remove, upgrade, distUpgrade, autoRemove) == false) {
+               std::cerr << "Parsing the request failed!" << std::endl;
+               return 2;
+       }
+
+       pkgCacheFile CacheFile;
+       CacheFile.Open(NULL, false);
+
+       if (EDSP::ApplyRequest(install, remove, CacheFile) == false) {
+               std::cerr << "Failed to apply request to depcache!" << std::endl;
+               return 3;
+       }
+       for (std::list<std::string>::const_iterator i = install.begin();
+            i != install.end(); ++i)
+               CacheFile->MarkInstall(CacheFile->FindPkg(*i), true);
+
+       pkgProblemResolver Fix(CacheFile);
+       if (Fix.Resolve() == false) {
+               EDSP::WriteError("An error occured", output);
+               return 0;
+       }
+
+       if (EDSP::WriteSolution(CacheFile, output) == false) {
+               std::cerr << "Failed to output the solution!" << std::endl;
+               return 4;
+       }
+
+       bool const Errors = _error->PendingError();
+       if (_config->FindI("quiet",0) > 0)
+               _error->DumpErrors();
+       else
+               _error->DumpErrors(GlobalError::DEBUG);
+       return Errors == true ? 100 : 0;
+}
+                                                                       /*}}}*/