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Diffstat (limited to 'cmdline/apt-extracttemplates.cc')
| -rw-r--r-- | cmdline/apt-extracttemplates.cc | 336 |
1 files changed, 336 insertions, 0 deletions
diff --git a/cmdline/apt-extracttemplates.cc b/cmdline/apt-extracttemplates.cc new file mode 100644 index 0000000..a578fa8 --- /dev/null +++ b/cmdline/apt-extracttemplates.cc @@ -0,0 +1,336 @@ +// -*- 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 <cstdio> +#include <cstdlib> +#include <cstring> +#include <iostream> +#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, {}); +} + /*}}}*/ |