cmdline/apt-extracttemplates.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: apt-extracttemplates.cc,v 1.15 2003/07/26 00:00:11 mdz Exp $
   4 /* ######################################################################
   5
   6    APT Extract Templates - Program to extract debconf config and template
   7                            files
   8
   9    This is a simple program to extract config and template information
  10    from Debian packages. It can be used to speed up the preconfiguration
  11    process for debconf-enabled packages
  12
  13    ##################################################################### */
  14                                                                         /*}}}*/
  15 // Include Files                                                        /*{{{*/
  16 #include <apt-pkg/init.h>
  17 #include <apt-pkg/cmndline.h>
  18 #include <apt-pkg/pkgcache.h>
  19 #include <apt-pkg/configuration.h>
  20 #include <apt-pkg/progress.h>
  21 #include <apt-pkg/sourcelist.h>
  22 #include <apt-pkg/pkgcachegen.h>
  23 #include <apt-pkg/version.h>
  24 #include <apt-pkg/tagfile.h>
  25 #include <apt-pkg/extracttar.h>
  26 #include <apt-pkg/arfile.h>
  27 #include <apt-pkg/deblistparser.h>
  28 #include <apt-pkg/error.h>
  29 #include <apt-pkg/strutl.h>
  30 #include <apt-pkg/fileutl.h>
  31
  32 #include <stdio.h>
  33 #include <string.h>
  34 #include <stdlib.h>
  35 #include <unistd.h>
  36 #include <fstream>
  37
  38 #include <locale.h>
  39 #include <config.h>
  40 #include <apti18n.h>
  41 #include "apt-extracttemplates.h"
  42                                                                         /*}}}*/
  43
  44 using namespace std;
  45
  46 #define TMPDIR          "/tmp"
  47
  48 pkgCache *DebFile::Cache = 0;
  49
  50 // DebFile::DebFile - Construct the DebFile object                      /*{{{*/
  51 // ---------------------------------------------------------------------
  52 /* */
  53 DebFile::DebFile(const char *debfile)
  54         : File(debfile, FileFd::ReadOnly), Control(0), DepOp(0),
  55           PreDepOp(0), Config(0), Template(0), Which(None)
  56 {
  57 }
  58                                                                         /*}}}*/
  59 // DebFile::~DebFile - Destruct the DebFile object                      /*{{{*/
  60 // ---------------------------------------------------------------------
  61 /* */
  62 DebFile::~DebFile()
  63 {
  64         delete [] Control;
  65         delete [] Config;
  66         delete [] Template;
  67 }
  68                                                                         /*}}}*/
  69 // DebFile::GetInstalledVer - Find out the installed version of a pkg   /*{{{*/
  70 // ---------------------------------------------------------------------
  71 /* */
  72 string DebFile::GetInstalledVer(const string &package)
  73 {
  74         pkgCache::PkgIterator Pkg = Cache->FindPkg(package);
  75         if (Pkg.end() == false)
  76         {
  77                 pkgCache::VerIterator V = Pkg.CurrentVer();
  78                 if (V.end() == false)
  79                 {
  80                         return V.VerStr();
  81                 }
  82         }
  83
  84         return string();
  85 }
  86                                                                         /*}}}*/
  87 // DebFile::Go - Start extracting a debian package                      /*{{{*/
  88 // ---------------------------------------------------------------------
  89 /* */
  90 bool DebFile::Go()
  91 {
  92         ARArchive AR(File);
  93         if (_error->PendingError() == true)
  94                 return false;
  95
  96         const ARArchive::Member *Member = AR.FindMember("control.tar.gz");
  97         if (Member == 0)
  98                 return _error->Error(_("%s not a valid DEB package."),File.Name().c_str());
  99
 100         if (File.Seek(Member->Start) == false)
 101                 return false;
 102         ExtractTar Tar(File, Member->Size,"gzip");
 103         return Tar.Go(*this);
 104 }
 105                                                                         /*}}}*/
 106 // DebFile::DoItem examine element in package and mark                  /*{{{*/
 107 // ---------------------------------------------------------------------
 108 /* */
 109 bool DebFile::DoItem(Item &I, int &Fd)
 110 {
 111         if (strcmp(I.Name, "control") == 0)
 112         {
 113                 delete [] Control;
 114                 Control = new char[I.Size+1];
 115                 Control[I.Size] = 0;
 116                 Which = IsControl;
 117                 ControlLen = I.Size;
 118                 // make it call the Process method below. this is so evil
 119                 Fd = -2;
 120         }
 121         else if (strcmp(I.Name, "config") == 0)
 122         {
 123                 delete [] Config;
 124                 Config = new char[I.Size+1];
 125                 Config[I.Size] = 0;
 126                 Which = IsConfig;
 127                 Fd = -2;
 128         }
 129         else if (strcmp(I.Name, "templates") == 0)
 130         {
 131                 delete [] Template;
 132                 Template = new char[I.Size+1];
 133                 Template[I.Size] = 0;
 134                 Which = IsTemplate;
 135                 Fd = -2;
 136         }
 137         else
 138         {
 139                 // Ignore it
 140                 Fd = -1;
 141         }
 142         return true;
 143 }
 144                                                                         /*}}}*/
 145 // DebFile::Process examine element in package and copy                 /*{{{*/
 146 // ---------------------------------------------------------------------
 147 /* */
 148 bool DebFile::Process(Item &I, const unsigned char *data,
 149                 unsigned long size, unsigned long pos)
 150 {
 151         switch (Which)
 152         {
 153         case IsControl:
 154                 memcpy(Control + pos, data, size);
 155                 break;
 156         case IsConfig:
 157                 memcpy(Config + pos, data, size);
 158                 break;
 159         case IsTemplate:
 160                 memcpy(Template + pos, data, size);
 161                 break;
 162         default: /* throw it away */ ;
 163         }
 164         return true;
 165 }
 166                                                                         /*}}}*/
 167 // DebFile::ParseInfo - Parse control file for dependency info          /*{{{*/
 168 // ---------------------------------------------------------------------
 169 /* */
 170 bool DebFile::ParseInfo()
 171 {
 172         if (Control == NULL) return false;
 173
 174         pkgTagSection Section;
 175         Section.Scan(Control, ControlLen);
 176
 177         Package = Section.FindS("Package");
 178         Version = GetInstalledVer(Package);
 179
 180         const char *Start, *Stop;
 181         if (Section.Find("Depends", Start, Stop) == true)
 182         {
 183                 while (1)
 184                 {
 185                         string P, V;
 186                         unsigned int Op;
 187                         Start = debListParser::ParseDepends(Start, Stop, P, V, Op);
 188                         if (Start == 0) return false;
 189                         if (P == "debconf")
 190                         {
 191                                 DepVer = V;
 192                                 DepOp = Op;
 193                                 break;
 194                         }
 195                         if (Start == Stop) break;
 196                 }
 197         }
 198
 199         if (Section.Find("Pre-Depends", Start, Stop) == true)
 200         {
 201                 while (1)
 202                 {
 203                         string P, V;
 204                         unsigned int Op;
 205                         Start = debListParser::ParseDepends(Start, Stop, P, V, Op);
 206                         if (Start == 0) return false;
 207                         if (P == "debconf")
 208                         {
 209                                 PreDepVer = V;
 210                                 PreDepOp = Op;
 211                                 break;
 212                         }
 213                         if (Start == Stop) break;
 214                 }
 215         }
 216
 217         return true;
 218 }
 219                                                                         /*}}}*/
 220 // ShowHelp - show a short help text                                    /*{{{*/
 221 // ---------------------------------------------------------------------
 222 /* */
 223 int ShowHelp(void)
 224 {
 225         ioprintf(cout,_("%s %s for %s compiled on %s %s\n"),PACKAGE,VERSION,
 226             COMMON_ARCH,__DATE__,__TIME__);
 227
 228         if (_config->FindB("version") == true)
 229                 return 0;
 230
 231         cout <<
 232                 _("Usage: apt-extracttemplates file1 [file2 ...]\n"
 233                 "\n"
 234                 "apt-extracttemplates is a tool to extract config and template info\n"
 235                 "from debian packages\n"
 236                 "\n"
 237                 "Options:\n"
 238                 "  -h   This help text\n"
 239                 "  -t   Set the temp dir\n"
 240                 "  -c=? Read this configuration file\n"
 241                 "  -o=? Set an arbitrary configuration option, eg -o dir::cache=/tmp\n");
 242         return 0;
 243 }
 244                                                                         /*}}}*/
 245 // WriteFile - write the contents of the passed string to a file        /*{{{*/
 246 // ---------------------------------------------------------------------
 247 /* */
 248 string WriteFile(const char *package, const char *prefix, const char *data)
 249 {
 250         char fn[512];
 251         static int i;
 252         const char *tempdir = NULL;
 253
 254         tempdir = getenv("TMPDIR");
 255         if (tempdir == NULL)
 256              tempdir = TMPDIR;
 257
 258         snprintf(fn, sizeof(fn), "%s/%s.%s.%u%d",
 259                  _config->Find("APT::ExtractTemplates::TempDir", tempdir).c_str(),
 260                  package, prefix, getpid(), i++);
 261         FileFd f;
 262         if (data == NULL)
 263                 data = "";
 264
 265         if (!f.Open(fn, FileFd::WriteTemp, 0600))
 266         {
 267                 _error->Errno("ofstream::ofstream",_("Unable to write to %s"),fn);
 268                 return string();
 269         }
 270
 271         f.Write(data, strlen(data));
 272         f.Close();
 273         return fn;
 274 }
 275                                                                         /*}}}*/
 276 // WriteConfig - write out the config data from a debian package file   /*{{{*/
 277 // ---------------------------------------------------------------------
 278 /* */
 279 void WriteConfig(const DebFile &file)
 280 {
 281         string templatefile = WriteFile(file.Package.c_str(), "template", file.Template);
 282         string configscript = WriteFile(file.Package.c_str(), "config", file.Config);
 283
 284         if (templatefile.empty() == true || configscript.empty() == true)
 285                 return;
 286         cout << file.Package << " " << file.Version << " "
 287              << templatefile << " " << configscript << endl;
 288 }
 289                                                                         /*}}}*/
 290 // InitCache - initialize the package cache                             /*{{{*/
 291 // ---------------------------------------------------------------------
 292 /* */
 293 bool Go(CommandLine &CmdL)
 294 {
 295         // Initialize the apt cache
 296         MMap *Map = 0;
 297         pkgSourceList List;
 298         List.ReadMainList();
 299         pkgCacheGenerator::MakeStatusCache(List,NULL,&Map,true);
 300         if (Map == 0)
 301            return false;
 302         DebFile::Cache = new pkgCache(Map);
 303         if (_error->PendingError() == true)
 304                 return false;
 305
 306         // Find out what version of debconf is currently installed
 307         string debconfver = DebFile::GetInstalledVer("debconf");
 308         if (debconfver.empty() == true)
 309                 return _error->Error( _("Cannot get debconf version. Is debconf installed?"));
 310
 311         // Process each package passsed in
 312         for (unsigned int I = 0; I != CmdL.FileSize(); I++)
 313         {
 314                 // Will pick up the errors later..
 315                 DebFile file(CmdL.FileList[I]);
 316                 if (file.Go() == false)
 317                 {
 318                         _error->Error("Prior errors apply to %s",CmdL.FileList[I]);
 319                         continue;
 320                 }
 321
 322                 // Does the package have templates?
 323                 if (file.Template != 0 && file.ParseInfo() == true)
 324                 {
 325                         // Check to make sure debconf dependencies are
 326                         // satisfied
 327                         // cout << "Check " << file.DepVer << ',' << debconfver << endl;
 328                         if (file.DepVer != "" &&
 329                             DebFile::Cache->VS->CheckDep(debconfver.c_str(),
 330                                         file.DepOp,file.DepVer.c_str()
 331                                                          ) == false)
 332                                 continue;
 333                         if (file.PreDepVer != "" &&
 334                             DebFile::Cache->VS->CheckDep(debconfver.c_str(),
 335                                         file.PreDepOp,file.PreDepVer.c_str()
 336                                                          ) == false)
 337                                 continue;
 338
 339                         WriteConfig(file);
 340                 }
 341         }
 342
 343
 344         delete Map;
 345         delete DebFile::Cache;
 346
 347         return !_error->PendingError();
 348 }
 349                                                                         /*}}}*/
 350 int main(int argc, const char **argv)                                   /*{{{*/
 351 {
 352         CommandLine::Args Args[] = {
 353                 {'h',"help","help",0},
 354                 {'v',"version","version",0},
 355                 {'t',"tempdir","APT::ExtractTemplates::TempDir",CommandLine::HasArg},
 356                 {'c',"config-file",0,CommandLine::ConfigFile},
 357                 {'o',"option",0,CommandLine::ArbItem},
 358                 {0,0,0,0}};
 359
 360         // Set up gettext support
 361         setlocale(LC_ALL,"");
 362         textdomain(PACKAGE);
 363
 364         // Parse the command line and initialize the package library
 365         CommandLine CmdL(Args,_config);
 366         if (pkgInitConfig(*_config) == false ||
 367             CmdL.Parse(argc,argv) == false ||
 368             pkgInitSystem(*_config,_system) == false)
 369         {
 370                 _error->DumpErrors();
 371                 return 100;
 372         }
 373
 374         // See if the help should be shown
 375         if (_config->FindB("help") == true ||
 376             CmdL.FileSize() == 0)
 377                 return ShowHelp();
 378
 379         Go(CmdL);
 380
 381         // Print any errors or warnings found during operation
 382         if (_error->empty() == false)
 383         {
 384                 // This goes to stderr..
 385                 bool Errors = _error->PendingError();
 386                 _error->DumpErrors();
 387                 return Errors == true?100:0;
 388         }
 389
 390         return 0;
 391 }
 392                                                                         /*}}}*/