apt-extracttemplates stuff from debconf

Author: tausq
Date: 2001-02-23 04:28:49 GMT
apt-extracttemplates stuff from debconf

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;
+}

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;
+}

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

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)