// -*- mode: cpp; mode: fold -*- // Description /*{{{*/ /* ###################################################################### APT Extract Templates - Program to extract debconf config and template files This is a simple program to extract config and template information from Debian packages. It can be used to speed up the preconfiguration process for debconf-enabled packages ##################################################################### */ /*}}}*/ // Include Files /*{{{*/ #include <config.h> #include <apt-pkg/cmndline.h> #include <apt-pkg/configuration.h> #include <apt-pkg/debfile.h> #include <apt-pkg/deblistparser.h> #include <apt-pkg/dirstream.h> #include <apt-pkg/error.h> #include <apt-pkg/fileutl.h> #include <apt-pkg/init.h> #include <apt-pkg/mmap.h> #include <apt-pkg/pkgcache.h> #include <apt-pkg/pkgcachegen.h> #include <apt-pkg/pkgsystem.h> #include <apt-pkg/sourcelist.h> #include <apt-pkg/strutl.h> #include <apt-pkg/tagfile.h> #include <apt-pkg/version.h> #include <apt-private/private-cmndline.h> #include <apt-private/private-main.h> #include <iostream> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include "apt-extracttemplates.h" #include <apti18n.h> /*}}}*/ using namespace std; pkgCache *DebFile::Cache = 0; // DebFile::DebFile - Construct the DebFile object /*{{{*/ // --------------------------------------------------------------------- /* */ DebFile::DebFile(const char *debfile) : File(debfile, FileFd::ReadOnly), Control(NULL), ControlLen(0), DepOp(0), PreDepOp(0), Config(0), Template(0), Which(None) { } /*}}}*/ // DebFile::~DebFile - Destruct the DebFile object /*{{{*/ // --------------------------------------------------------------------- /* */ DebFile::~DebFile() { delete [] Control; delete [] Config; delete [] Template; } /*}}}*/ // DebFile::GetInstalledVer - Find out the installed version of a pkg /*{{{*/ // --------------------------------------------------------------------- /* */ string DebFile::GetInstalledVer(const string &package) { pkgCache::PkgIterator Pkg = Cache->FindPkg(package); if (Pkg.end() == false) { pkgCache::VerIterator V = Pkg.CurrentVer(); if (V.end() == false) { return V.VerStr(); } } return string(); } /*}}}*/ // DebFile::Go - Start extracting a debian package /*{{{*/ // --------------------------------------------------------------------- /* */ bool DebFile::Go() { debDebFile Deb(File); return Deb.ExtractTarMember(*this, "control.tar"); } /*}}}*/ // DebFile::DoItem examine element in package and mark /*{{{*/ // --------------------------------------------------------------------- /* */ bool DebFile::DoItem(Item &I, int &Fd) { if (strcmp(I.Name, "control") == 0) { delete [] Control; Control = new char[I.Size+3]; Control[I.Size] = '\n'; Control[I.Size + 1] = '\n'; Control[I.Size + 2] = '\0'; Which = IsControl; ControlLen = I.Size + 3; // make it call the Process method below. this is so evil Fd = -2; } else if (strcmp(I.Name, "config") == 0) { delete [] Config; Config = new char[I.Size+1]; Config[I.Size] = 0; Which = IsConfig; Fd = -2; } else if (strcmp(I.Name, "templates") == 0) { delete [] Template; Template = new char[I.Size+1]; Template[I.Size] = 0; Which = IsTemplate; Fd = -2; } else { // Ignore it Fd = -1; } return true; } /*}}}*/ // DebFile::Process examine element in package and copy /*{{{*/ // --------------------------------------------------------------------- /* */ bool DebFile::Process(Item &/*I*/, const unsigned char *data, unsigned long long size, unsigned long long pos) { switch (Which) { case IsControl: memcpy(Control + pos, data, size); break; case IsConfig: memcpy(Config + pos, data, size); break; case IsTemplate: memcpy(Template + pos, data, size); break; default: /* throw it away */ ; } return true; } /*}}}*/ // DebFile::ParseInfo - Parse control file for dependency info /*{{{*/ // --------------------------------------------------------------------- /* */ bool DebFile::ParseInfo() { if (Control == NULL) return false; pkgTagSection Section; if (Section.Scan(Control, ControlLen) == false) return false; Package = Section.FindS("Package"); Version = GetInstalledVer(Package); const char *Start, *Stop; if (Section.Find("Depends", Start, Stop) == true) { while (1) { string P, V; unsigned int Op; Start = debListParser::ParseDepends(Start, Stop, P, V, Op); if (Start == 0) return false; if (P == "debconf") { DepVer = V; DepOp = Op; break; } if (Start == Stop) break; } } if (Section.Find("Pre-Depends", Start, Stop) == true) { while (1) { string P, V; unsigned int Op; Start = debListParser::ParseDepends(Start, Stop, P, V, Op); if (Start == 0) return false; if (P == "debconf") { PreDepVer = V; PreDepOp = Op; break; } if (Start == Stop) break; } } return true; } /*}}}*/ static bool ShowHelp(CommandLine &) /*{{{*/ { cout << _("Usage: apt-extracttemplates file1 [file2 ...]\n" "\n" "apt-extracttemplates is used to extract config and template files\n" "from debian packages. It is used mainly by debconf(1) to prompt for\n" "configuration questions before installation of packages.\n"); return true; } /*}}}*/ // WriteFile - write the contents of the passed string to a file /*{{{*/ // --------------------------------------------------------------------- /* */ static string WriteFile(const char *package, const char *prefix, const char *data) { FileFd f; std::string tplname; strprintf(tplname, "%s.%s", package, prefix); GetTempFile(tplname, false, &f); if (data != nullptr) f.Write(data, strlen(data)); return f.Name(); } /*}}}*/ // WriteConfig - write out the config data from a debian package file /*{{{*/ // --------------------------------------------------------------------- /* */ static void WriteConfig(const DebFile &file) { string templatefile = WriteFile(file.Package.c_str(), "template", file.Template); string configscript = WriteFile(file.Package.c_str(), "config", file.Config); if (templatefile.empty() == true || configscript.empty() == true) return; cout << file.Package << " " << file.Version << " " << templatefile << " " << configscript << endl; } /*}}}*/ // InitCache - initialize the package cache /*{{{*/ // --------------------------------------------------------------------- /* */ static bool Go(CommandLine &CmdL) { // Initialize the apt cache MMap *Map = 0; pkgSourceList List; List.ReadMainList(); pkgCacheGenerator::MakeStatusCache(List,NULL,&Map,true); if (Map == 0) return false; DebFile::Cache = new pkgCache(Map); if (_error->PendingError() == true) return false; // Find out what version of debconf is currently installed string debconfver = DebFile::GetInstalledVer("debconf"); if (debconfver.empty() == true) return _error->Error( _("Cannot get debconf version. Is debconf installed?")); auto const tmpdir = _config->Find("APT::ExtractTemplates::TempDir"); if (tmpdir.empty() == false) setenv("TMPDIR", tmpdir.c_str(), 1); // Process each package passsed in for (unsigned int I = 0; I != CmdL.FileSize(); I++) { // Will pick up the errors later.. DebFile file(CmdL.FileList[I]); if (file.Go() == false) { _error->Error("Prior errors apply to %s",CmdL.FileList[I]); continue; } // Does the package have templates? if (file.Template != 0 && file.ParseInfo() == true) { // Check to make sure debconf dependencies are // satisfied // cout << "Check " << file.DepVer << ',' << debconfver << endl; if (file.DepVer != "" && DebFile::Cache->VS->CheckDep(debconfver.c_str(), file.DepOp,file.DepVer.c_str() ) == false) continue; if (file.PreDepVer != "" && DebFile::Cache->VS->CheckDep(debconfver.c_str(), file.PreDepOp,file.PreDepVer.c_str() ) == false) continue; WriteConfig(file); } } delete Map; delete DebFile::Cache; return !_error->PendingError(); } /*}}}*/ static std::vector<aptDispatchWithHelp> GetCommands() /*{{{*/ { return { {nullptr, nullptr, nullptr} }; } /*}}}*/ int main(int argc, const char **argv) /*{{{*/ { CommandLine CmdL; auto const Cmds = ParseCommandLine(CmdL, APT_CMD::APT_EXTRACTTEMPLATES, &_config, &_system, argc, argv, &ShowHelp, &GetCommands); Go(CmdL); return DispatchCommandLine(CmdL, {}); } /*}}}*/