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apt-extracttemplates stuff from debconf

Author: tausq
Date: 2001-02-23 04:28:49 GMT
apt-extracttemplates stuff from debconf
debian/1.8.y
Arch Librarian 18 years ago
parent
commit
3fc8f68523
  1. 142
      cmdline/apt-extracttemplates.cc
  2. 304
      cmdline/debfile.cc
  3. 45
      cmdline/debfile.h
  4. 7
      cmdline/makefile

142
cmdline/apt-extracttemplates.cc

@ -0,0 +1,142 @@
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#define _GNU_SOURCE
#include <getopt.h>
#include <wait.h>
#include <fstream.h>
#include <apt-pkg/init.h>
#if APT_PKG_MAJOR >= 3
#define APT_COMPATIBILITY 986
#include <apt-pkg/debversion.h>
#endif
#include <apt-pkg/pkgcache.h>
#include <apt-pkg/configuration.h>
#include <apt-pkg/progress.h>
#include <apt-pkg/sourcelist.h>
#include <apt-pkg/pkgcachegen.h>
#include <apt-pkg/version.h>
#include "debfile.h"
#define TMPDIR "/var/lib/debconf/"
#define STR(x) (x ? x : "")
//#define TMPDIR "tmp/"
void help(void)
{
fprintf(stderr, "apt-extracttemplates deb [deb]\n");
exit(0);
}
char *writefile(const char *prefix, const char *data)
{
char fn[512];
static int i;
snprintf(fn, sizeof(fn), "%s%s.%u%d", TMPDIR, prefix, getpid(), i++);
if (data == NULL) data = "";
ofstream ofs(fn);
if (!ofs) return NULL;
ofs << data;
ofs.close();
return strdup(fn);
}
void writeconfig(const DebFile &file)
{
char *templatefile = writefile("template", file.Template);
char *configscript = writefile("config", file.Config);
if (templatefile == 0 || configscript == 0)
{
fprintf(stderr, "Cannot write config script or templates\n");
return;
}
printf("%s %s %s %s\n",
STR(file.Package), // Package
STR(file.Version), // Version
templatefile, // Template
configscript // Config
);
}
void init(MMap *&Map, pkgCache *&Cache)
{
// Initialize the apt cache
if (pkgInitConfig(*_config) == false || pkgInitSystem(*_config, _system) == false)
{
fprintf(stderr, "Cannot initialize apt cache\n");
return;
}
pkgSourceList List;
List.ReadMainList();
OpProgress Prog;
pkgMakeStatusCache(List,Prog,&Map,true);
Cache = new pkgCache(Map);
}
int main(int argc, char **argv, char **env)
{
int idx = 0;
char **debs = 0;
int numdebs = 0;
MMap *Map = 0;
const char *debconfver = NULL;
init(Map, DebFile::Cache);
if (Map == 0 || DebFile::Cache == 0)
{
fprintf(stderr, "Cannot initialize APT cache\n");
return 1;
}
debconfver = DebFile::GetInstalledVer("debconf");
if (debconfver == NULL)
{
fprintf(stderr, "Cannot get debconf version. Is debconf installed?\n");
return 1;
}
numdebs = argc - 1;
debs = new char *[numdebs];
memcpy(debs, &argv[1], sizeof(char *) * numdebs);
if (numdebs < 1)
{
fprintf(stderr, "apt-extracttemplates foo.deb [...]\n");
return 0;
}
for (idx = 0; idx < numdebs; idx++)
{
DebFile file(debs[idx]);
if (file.Go() == false)
{
fprintf(stderr, "Cannot read %s\n", debs[idx]);
continue;
}
if (file.Template != 0 && file.ParseInfo() == true)
{
if (file.DepVer != 0 && *file.DepVer != 0 &&
pkgCheckDep(file.DepVer,
debconfver, file.DepOp) == false)
continue;
if (file.PreDepVer != 0 && *file.PreDepVer != 0 &&
pkgCheckDep(file.PreDepVer,
debconfver, file.PreDepOp) == false)
continue;
writeconfig(file);
}
}
delete Map;
delete DebFile::Cache;
return 0;
}

304
cmdline/debfile.cc

@ -0,0 +1,304 @@
#include <stdio.h>
#include <apt-pkg/tagfile.h>
#include <apt-pkg/extracttar.h>
#include <apt-pkg/arfile.h>
#include <apt-pkg/pkgcache.h>
#include "debfile.h"
pkgCache *DebFile::Cache = 0;
DebFile::DebFile(const char *debfile)
: File(debfile, FileFd::ReadOnly), Control(0), Package(0), Version(0), DepVer(0), PreDepVer(0), DepOp(0), PreDepOp(0), Config(0), Template(0), Which(None)
{
}
DebFile::~DebFile()
{
delete [] Control;
delete [] Config;
delete [] Template;
}
char *DebFile::GetInstalledVer(const char *package)
{
char *ver = 0;
pkgCache::PkgIterator Pkg = Cache->FindPkg(package);
if (Pkg.end() == false)
{
pkgCache::VerIterator V = Pkg.CurrentVer();
if (V.end() == false)
{
ver = strdup(V.VerStr());
}
}
return ver;
}
bool DebFile::Go()
{
ARArchive AR(File);
const ARArchive::Member *Member = AR.FindMember("control.tar.gz");
if (Member == 0)
{
fprintf(stderr, "This is not a valid DEB archive.\n");
return false;
}
if (File.Seek(Member->Start) == false)
{
return false;
}
ExtractTar Tar(File, Member->Size);
return Tar.Go(*this);
}
bool DebFile::DoItem(Item &I, int &Fd)
{
if (strcmp(I.Name, "control") == 0)
{
delete [] Control;
Control = new char[I.Size+1];
Control[I.Size] = 0;
Which = IsControl;
ControlLen = I.Size;
// 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
{
Fd = -1;
}
return true;
}
bool DebFile::Process(Item &I, const unsigned char *data,
unsigned long size, unsigned 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;
}
bool DebFile::ParseInfo()
{
if (Control == NULL) return false;
pkgTagSection Section;
Section.Scan(Control, ControlLen);
const char *pkgtmp = Section.FindS("Package").c_str();
Package = CopyString(pkgtmp, strlen(pkgtmp));
Version = GetInstalledVer(Package);
const char *Start, *Stop;
if (Section.Find("Depends", Start, Stop) == true)
{
while (1)
{
char *P = 0, *V = 0;
unsigned int Op;
Start = ParseDepends(Start, Stop, P, V, Op);
if (Start == 0) return false;
if (strcmp(P, "debconf") == 0)
{
DepVer = V;
DepOp = Op;
delete[] P;
break;
}
else
{
delete[] P;
delete[] V;
}
if (Start == Stop) break;
}
}
if (Section.Find("Pre-Depends", Start, Stop) == true)
{
while (1)
{
char *P = 0, *V = 0;
unsigned int Op;
Start = ParseDepends(Start, Stop, P, V, Op);
if (Start == 0) return false;
if (strcmp(P, "debconf") == 0)
{
PreDepVer = V;
PreDepOp = Op;
delete[] P;
break;
}
else
{
delete[] P;
delete[] V;
}
if (Start == Stop) break;
}
}
return true;
}
char *DebFile::CopyString(const char *start, unsigned int len)
{
char *s = new char[len + 1];
s[len] = 0;
memcpy(s, start, len);
return s;
}
const char *DebFile::ParseDepends(const char *Start,const char *Stop,
char *&Package, char *&Ver,
unsigned int &Op)
{
// Strip off leading space
for (;Start != Stop && isspace(*Start) != 0; Start++);
// Parse off the package name
const char *I = Start;
for (;I != Stop && isspace(*I) == 0 && *I != '(' && *I != ')' &&
*I != ',' && *I != '|'; I++);
// Malformed, no '('
if (I != Stop && *I == ')')
return 0;
if (I == Start)
return 0;
// Stash the package name
Package = CopyString(Start, I - Start);
// Skip white space to the '('
for (;I != Stop && isspace(*I) != 0 ; I++);
// Parse a version
if (I != Stop && *I == '(')
{
// Skip the '('
for (I++; I != Stop && isspace(*I) != 0 ; I++);
if (I + 3 >= Stop)
return 0;
// Determine the operator
switch (*I)
{
case '<':
I++;
if (*I == '=')
{
I++;
Op = pkgCache::Dep::LessEq;
break;
}
if (*I == '<')
{
I++;
Op = pkgCache::Dep::Less;
break;
}
// < is the same as <= and << is really Cs < for some reason
Op = pkgCache::Dep::LessEq;
break;
case '>':
I++;
if (*I == '=')
{
I++;
Op = pkgCache::Dep::GreaterEq;
break;
}
if (*I == '>')
{
I++;
Op = pkgCache::Dep::Greater;
break;
}
// > is the same as >= and >> is really Cs > for some reason
Op = pkgCache::Dep::GreaterEq;
break;
case '=':
Op = pkgCache::Dep::Equals;
I++;
break;
// HACK around bad package definitions
default:
Op = pkgCache::Dep::Equals;
break;
}
// Skip whitespace
for (;I != Stop && isspace(*I) != 0; I++);
Start = I;
for (;I != Stop && *I != ')'; I++);
if (I == Stop || Start == I)
return 0;
// Skip trailing whitespace
const char *End = I;
for (; End > Start && isspace(End[-1]); End--);
Ver = CopyString(Start, End - Start);
I++;
}
else
{
Ver = CopyString("", 0);
Op = pkgCache::Dep::NoOp;
}
// Skip whitespace
for (;I != Stop && isspace(*I) != 0; I++);
if (I != Stop && *I == '|')
Op |= pkgCache::Dep::Or;
if (I == Stop || *I == ',' || *I == '|')
{
if (I != Stop)
for (I++; I != Stop && isspace(*I) != 0; I++);
return I;
}
return 0;
}

45
cmdline/debfile.h

@ -0,0 +1,45 @@
#ifndef _debfile_H
#define _debfile_H
#include <apt-pkg/fileutl.h>
#include <apt-pkg/pkgcache.h>
#include <apt-pkg/dirstream.h>
class DebFile : public pkgDirStream
{
const char *ParseDepends(const char *Start,const char *Stop,
char *&Package, char *&Ver,
unsigned int &Op);
char *CopyString(const char *start, unsigned int len);
FileFd File;
unsigned long Size;
char *Control;
unsigned long ControlLen;
public:
DebFile(const char *FileName);
~DebFile();
bool DoItem(Item &I, int &fd);
bool Process(pkgDirStream::Item &I, const unsigned char *data,
unsigned long size, unsigned long pos);
bool Go();
bool ParseInfo();
static char *GetInstalledVer(const char *package);
char *Package;
char *Version;
char *DepVer, *PreDepVer;
unsigned int DepOp, PreDepOp;
char *Config;
char *Template;
static pkgCache *Cache;
enum { None, IsControl, IsConfig, IsTemplate } Which;
};
#endif

7
cmdline/makefile

@ -39,3 +39,10 @@ SLIBS = -lapt-pkg
LIB_MAKES = apt-pkg/makefile
SOURCE = apt-sortpkgs.cc
include $(PROGRAM_H)
# The apt-extracttemplates program
PROGRAM=apt-extracttemplates
SLIBS = -lapt-pkg -lapt-inst
LIB_MAKES = apt-pkg/makefile
SOURCE = apt-extracttemplates.cc debfile.cc
include $(PROGRAM_H)

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