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+// -*- 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-keys.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.Find(pkgTagSection::Key::Package).to_string();
+ Version = GetInstalledVer(Package);
+
+ const char *Start, *Stop;
+ if (Section.Find(pkgTagSection::Key::Depends, Start, Stop))
+ {
+ 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(pkgTagSection::Key::Pre_Depends, Start, Stop))
+ {
+ 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;
+ ParseCommandLine(CmdL, APT_CMD::APT_EXTRACTTEMPLATES, &_config, &_system, argc, argv, &ShowHelp, &GetCommands);
+
+ Go(CmdL);
+
+ return DispatchCommandLine(CmdL, {});
+}
+ /*}}}*/
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