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