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<config.h>
  17
  18 #include <apt-pkg/init.h>
  19 #include <apt-pkg/cmndline.h>
  20 #include <apt-pkg/pkgcache.h>
  21 #include <apt-pkg/configuration.h>
  22 #include <apt-pkg/progress.h>
  23 #include <apt-pkg/sourcelist.h>
  24 #include <apt-pkg/pkgcachegen.h>
  25 #include <apt-pkg/version.h>
  26 #include <apt-pkg/tagfile.h>
  27 #include <apt-pkg/extracttar.h>
  28 #include <apt-pkg/arfile.h>
  29 #include <apt-pkg/deblistparser.h>
  30 #include <apt-pkg/error.h>
  31 #include <apt-pkg/strutl.h>
  32 #include <apt-pkg/fileutl.h>
  33 #include <apt-pkg/pkgsystem.h>
  34
  35 #include <stdio.h>
  36 #include <string.h>
  37 #include <stdlib.h>
  38 #include <unistd.h>
  39 #include <fstream>
  40
  41 #include <locale.h>
  42 #include <apti18n.h>
  43 #include "apt-extracttemplates.h"
  44                                                                         /*}}}*/
  45
  46 using namespace std;
  47
  48 #define TMPDIR          "/tmp"
  49
  50 pkgCache *DebFile::Cache = 0;
  51
  52 // DebFile::DebFile - Construct the DebFile object                      /*{{{*/
  53 // ---------------------------------------------------------------------
  54 /* */
  55 DebFile::DebFile(const char *debfile)
  56         : File(debfile, FileFd::ReadOnly), Size(0), Control(NULL), ControlLen(0),
  57           DepOp(0), PreDepOp(0), Config(0), Template(0), Which(None)
  58 {
  59 }
  60                                                                         /*}}}*/
  61 // DebFile::~DebFile - Destruct the DebFile object                      /*{{{*/
  62 // ---------------------------------------------------------------------
  63 /* */
  64 DebFile::~DebFile()
  65 {
  66         delete [] Control;
  67         delete [] Config;
  68         delete [] Template;
  69 }
  70                                                                         /*}}}*/
  71 // DebFile::GetInstalledVer - Find out the installed version of a pkg   /*{{{*/
  72 // ---------------------------------------------------------------------
  73 /* */
  74 string DebFile::GetInstalledVer(const string &package)
  75 {
  76         pkgCache::PkgIterator Pkg = Cache->FindPkg(package);
  77         if (Pkg.end() == false)
  78         {
  79                 pkgCache::VerIterator V = Pkg.CurrentVer();
  80                 if (V.end() == false)
  81                 {
  82                         return V.VerStr();
  83                 }
  84         }
  85
  86         return string();
  87 }
  88                                                                         /*}}}*/
  89 // DebFile::Go - Start extracting a debian package                      /*{{{*/
  90 // ---------------------------------------------------------------------
  91 /* */
  92 bool DebFile::Go()
  93 {
  94         ARArchive AR(File);
  95         if (_error->PendingError() == true)
  96                 return false;
  97
  98         const ARArchive::Member *Member = AR.FindMember("control.tar.gz");
  99         if (Member == 0)
 100                 return _error->Error(_("%s not a valid DEB package."),File.Name().c_str());
 101
 102         if (File.Seek(Member->Start) == false)
 103                 return false;
 104         ExtractTar Tar(File, Member->Size,"gzip");
 105         return Tar.Go(*this);
 106 }
 107                                                                         /*}}}*/
 108 // DebFile::DoItem examine element in package and mark                  /*{{{*/
 109 // ---------------------------------------------------------------------
 110 /* */
 111 bool DebFile::DoItem(Item &I, int &Fd)
 112 {
 113         if (strcmp(I.Name, "control") == 0)
 114         {
 115                 delete [] Control;
 116                 Control = new char[I.Size+1];
 117                 Control[I.Size] = 0;
 118                 Which = IsControl;
 119                 ControlLen = I.Size;
 120                 // make it call the Process method below. this is so evil
 121                 Fd = -2;
 122         }
 123         else if (strcmp(I.Name, "config") == 0)
 124         {
 125                 delete [] Config;
 126                 Config = new char[I.Size+1];
 127                 Config[I.Size] = 0;
 128                 Which = IsConfig;
 129                 Fd = -2;
 130         }
 131         else if (strcmp(I.Name, "templates") == 0)
 132         {
 133                 delete [] Template;
 134                 Template = new char[I.Size+1];
 135                 Template[I.Size] = 0;
 136                 Which = IsTemplate;
 137                 Fd = -2;
 138         }
 139         else
 140         {
 141                 // Ignore it
 142                 Fd = -1;
 143         }
 144         return true;
 145 }
 146                                                                         /*}}}*/
 147 // DebFile::Process examine element in package and copy                 /*{{{*/
 148 // ---------------------------------------------------------------------
 149 /* */
 150 bool DebFile::Process(Item &I, const unsigned char *data,
 151                 unsigned long size, unsigned long pos)
 152 {
 153         switch (Which)
 154         {
 155         case IsControl:
 156                 memcpy(Control + pos, data, size);
 157                 break;
 158         case IsConfig:
 159                 memcpy(Config + pos, data, size);
 160                 break;
 161         case IsTemplate:
 162                 memcpy(Template + pos, data, size);
 163                 break;
 164         default: /* throw it away */ ;
 165         }
 166         return true;
 167 }
 168                                                                         /*}}}*/
 169 // DebFile::ParseInfo - Parse control file for dependency info          /*{{{*/
 170 // ---------------------------------------------------------------------
 171 /* */
 172 bool DebFile::ParseInfo()
 173 {
 174         if (Control == NULL) return false;
 175
 176         pkgTagSection Section;
 177         Section.Scan(Control, ControlLen);
 178
 179         Package = Section.FindS("Package");
 180         Version = GetInstalledVer(Package);
 181
 182         const char *Start, *Stop;
 183         if (Section.Find("Depends", Start, Stop) == true)
 184         {
 185                 while (1)
 186                 {
 187                         string P, V;
 188                         unsigned int Op;
 189                         Start = debListParser::ParseDepends(Start, Stop, P, V, Op);
 190                         if (Start == 0) return false;
 191                         if (P == "debconf")
 192                         {
 193                                 DepVer = V;
 194                                 DepOp = Op;
 195                                 break;
 196                         }
 197                         if (Start == Stop) break;
 198                 }
 199         }
 200
 201         if (Section.Find("Pre-Depends", Start, Stop) == true)
 202         {
 203                 while (1)
 204                 {
 205                         string P, V;
 206                         unsigned int Op;
 207                         Start = debListParser::ParseDepends(Start, Stop, P, V, Op);
 208                         if (Start == 0) return false;
 209                         if (P == "debconf")
 210                         {
 211                                 PreDepVer = V;
 212                                 PreDepOp = Op;
 213                                 break;
 214                         }
 215                         if (Start == Stop) break;
 216                 }
 217         }
 218
 219         return true;
 220 }
 221                                                                         /*}}}*/
 222 // ShowHelp - show a short help text                                    /*{{{*/
 223 // ---------------------------------------------------------------------
 224 /* */
 225 int ShowHelp(void)
 226 {
 227         ioprintf(cout,_("%s %s for %s compiled on %s %s\n"),PACKAGE,VERSION,
 228             COMMON_ARCH,__DATE__,__TIME__);
 229
 230         if (_config->FindB("version") == true)
 231                 return 0;
 232
 233         cout <<
 234                 _("Usage: apt-extracttemplates file1 [file2 ...]\n"
 235                 "\n"
 236                 "apt-extracttemplates is a tool to extract config and template info\n"
 237                 "from debian packages\n"
 238                 "\n"
 239                 "Options:\n"
 240                 "  -h   This help text\n"
 241                 "  -t   Set the temp dir\n"
 242                 "  -c=? Read this configuration file\n"
 243                 "  -o=? Set an arbitrary configuration option, eg -o dir::cache=/tmp\n");
 244         return 0;
 245 }
 246                                                                         /*}}}*/
 247 // WriteFile - write the contents of the passed string to a file        /*{{{*/
 248 // ---------------------------------------------------------------------
 249 /* */
 250 string WriteFile(const char *package, const char *prefix, const char *data)
 251 {
 252         char fn[512];
 253         static int i;
 254         const char *tempdir = NULL;
 255
 256         tempdir = getenv("TMPDIR");
 257         if (tempdir == NULL)
 258              tempdir = TMPDIR;
 259
 260         snprintf(fn, sizeof(fn), "%s/%s.%s.%u%d",
 261                  _config->Find("APT::ExtractTemplates::TempDir", tempdir).c_str(),
 262                  package, prefix, getpid(), i++);
 263         FileFd f;
 264         if (data == NULL)
 265                 data = "";
 266
 267         if (!f.Open(fn, FileFd::WriteTemp, 0600))
 268         {
 269                 _error->Errno("ofstream::ofstream",_("Unable to write to %s"),fn);
 270                 return string();
 271         }
 272
 273         f.Write(data, strlen(data));
 274         f.Close();
 275         return fn;
 276 }
 277                                                                         /*}}}*/
 278 // WriteConfig - write out the config data from a debian package file   /*{{{*/
 279 // ---------------------------------------------------------------------
 280 /* */
 281 void WriteConfig(const DebFile &file)
 282 {
 283         string templatefile = WriteFile(file.Package.c_str(), "template", file.Template);
 284         string configscript = WriteFile(file.Package.c_str(), "config", file.Config);
 285
 286         if (templatefile.empty() == true || configscript.empty() == true)
 287                 return;
 288         cout << file.Package << " " << file.Version << " "
 289              << templatefile << " " << configscript << endl;
 290 }
 291                                                                         /*}}}*/
 292 // InitCache - initialize the package cache                             /*{{{*/
 293 // ---------------------------------------------------------------------
 294 /* */
 295 bool Go(CommandLine &CmdL)
 296 {
 297         // Initialize the apt cache
 298         MMap *Map = 0;
 299         pkgSourceList List;
 300         List.ReadMainList();
 301         pkgCacheGenerator::MakeStatusCache(List,NULL,&Map,true);
 302         if (Map == 0)
 303            return false;
 304         DebFile::Cache = new pkgCache(Map);
 305         if (_error->PendingError() == true)
 306                 return false;
 307
 308         // Find out what version of debconf is currently installed
 309         string debconfver = DebFile::GetInstalledVer("debconf");
 310         if (debconfver.empty() == true)
 311                 return _error->Error( _("Cannot get debconf version. Is debconf installed?"));
 312
 313         // Process each package passsed in
 314         for (unsigned int I = 0; I != CmdL.FileSize(); I++)
 315         {
 316                 // Will pick up the errors later..
 317                 DebFile file(CmdL.FileList[I]);
 318                 if (file.Go() == false)
 319                 {
 320                         _error->Error("Prior errors apply to %s",CmdL.FileList[I]);
 321                         continue;
 322                 }
 323
 324                 // Does the package have templates?
 325                 if (file.Template != 0 && file.ParseInfo() == true)
 326                 {
 327                         // Check to make sure debconf dependencies are
 328                         // satisfied
 329                         // cout << "Check " << file.DepVer << ',' << debconfver << endl;
 330                         if (file.DepVer != "" &&
 331                             DebFile::Cache->VS->CheckDep(debconfver.c_str(),
 332                                         file.DepOp,file.DepVer.c_str()
 333                                                          ) == false)
 334                                 continue;
 335                         if (file.PreDepVer != "" &&
 336                             DebFile::Cache->VS->CheckDep(debconfver.c_str(),
 337                                         file.PreDepOp,file.PreDepVer.c_str()
 338                                                          ) == false)
 339                                 continue;
 340
 341                         WriteConfig(file);
 342                 }
 343         }
 344
 345
 346         delete Map;
 347         delete DebFile::Cache;
 348
 349         return !_error->PendingError();
 350 }
 351                                                                         /*}}}*/
 352 int main(int argc, const char **argv)                                   /*{{{*/
 353 {
 354         CommandLine::Args Args[] = {
 355                 {'h',"help","help",0},
 356                 {'v',"version","version",0},
 357                 {'t',"tempdir","APT::ExtractTemplates::TempDir",CommandLine::HasArg},
 358                 {'c',"config-file",0,CommandLine::ConfigFile},
 359                 {'o',"option",0,CommandLine::ArbItem},
 360                 {0,0,0,0}};
 361
 362         // Set up gettext support
 363         setlocale(LC_ALL,"");
 364         textdomain(PACKAGE);
 365
 366         // Parse the command line and initialize the package library
 367         CommandLine CmdL(Args,_config);
 368         if (pkgInitConfig(*_config) == false ||
 369             CmdL.Parse(argc,argv) == false ||
 370             pkgInitSystem(*_config,_system) == false)
 371         {
 372                 _error->DumpErrors();
 373                 return 100;
 374         }
 375
 376         // See if the help should be shown
 377         if (_config->FindB("help") == true ||
 378             CmdL.FileSize() == 0)
 379                 return ShowHelp();
 380
 381         Go(CmdL);
 382
 383         // Print any errors or warnings found during operation
 384         if (_error->empty() == false)
 385         {
 386                 // This goes to stderr..
 387                 bool Errors = _error->PendingError();
 388                 _error->DumpErrors();
 389                 return Errors == true?100:0;
 390         }
 391
 392         return 0;
 393 }
 394                                                                         /*}}}*/