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// Includes /*{{{*/
#include <apt-pkg/acquire-item.h>
#include <apt-pkg/fileutl.h>
#include <apt-pkg/mmap.h>
#include <apt-pkg/error.h>
#include <apt-pkg/acquire-method.h>
#include <apt-pkg/strutl.h>
#include <apt-pkg/hashes.h>
#include <apt-pkg/init.h>
#include <sys/stat.h>
#include <sys/uio.h>
#include <unistd.h>
#include <utime.h>
#include <stdio.h>
#include <errno.h>
#include <zlib.h>
#include <apti18n.h>
/*}}}*/
/** \brief DebdeltaMethod - This method is used to patch a new deb from
* an input deb and a debdelta file.
* */
class DebdeltaMethod : public pkgAcqMethod {
bool Debug;
protected:
// the main(i.e. most important) method of the debdelta method.
virtual bool Fetch(FetchItem *Itm);
public:
DebdeltaMethod() : pkgAcqMethod("1.1", SingleInstance | SendConfig) {};
string GetNewPackageName(string debdeltaName);
};
bool DebdeltaMethod::Fetch(FetchItem *Itm) /*{{{*/
{
Debug = _config->FindB("Debug::pkgAcquire::RRed", false);
string OldDebFile = Itm->DestFile;
string DebDeltaFile = Itm->Uri;
if (!FileExists(OldDebFile))
OldDebFile = "/";
if (!FileExists(DebDeltaFile))
return _error->Error("Could not find a debdelta file.");
string NewDeb = GetNewPackageName(DebDeltaFile);
Itm->DestFile = _config->FindDir("Dir::Cache::Archives") + "partial/" + NewDeb;
if (FileExists(Itm->DestFile))
return _error->Error("New .deb already exists.");
pid_t Process = ExecFork();
if (Process == 0)
{
const char* Args[6] = {0};
Args[0] = "/usr/bin/debpatch";
if (!FileExists(Args[0]))
return _error->Error("Could not find debpatch.");
Args[1] = "-A";
Args[2] = DebDeltaFile.c_str();
Args[3] = OldDebFile.c_str();
Args[4] = Itm->DestFile.c_str();
if (Debug == true)
{
std::cerr << "Debdelta command:" << std::endl;
std::cerr << Args[0] << " " << Args[1] << " " << Args[2] << " " << Args[3] << " "
<< Args[4] << std::endl;
}
execv(Args[0], (char **)Args);
}
if (ExecWait(Process, "debpatch"))
{
if (!FileExists(Itm->DestFile))
return _error->Error("Failed to patch %s", Itm->DestFile.c_str());
// move the .deb to Dir::Cache::Archives
OldDebFile = _config->FindDir("Dir::Cache::Archives") + NewDeb;
Rename(Itm->DestFile, OldDebFile);
Itm->DestFile = OldDebFile;
return true;
}
Itm->DestFile = OldDebFile;
return false;
}
/**
* \brief Receives a debdelta file name in the form of path/P_O_N_A.debdelta and constructs the name
* of the deb with the newer version.
* @param debdeltaName the name of the debdelta file.
* @return path/P_N_A.deb
*/
string DebdeltaMethod::GetNewPackageName(string DebdeltaName)
{
int Slashpos = DebdeltaName.rfind("/", DebdeltaName.length() - 1);
string Path = DebdeltaName.substr(0, Slashpos + 1);
DebdeltaName = DebdeltaName.substr(Slashpos + 1, DebdeltaName.length() - 1);
int NewBegin = DebdeltaName.find("_", 0);
string PkgName = DebdeltaName.substr(0, NewBegin);
NewBegin = DebdeltaName.find("_", NewBegin + 1);
int NewEnd = DebdeltaName.find("_", NewBegin + 1);
string NewVersion = DebdeltaName.substr(NewBegin + 1, NewEnd - NewBegin - 1);
string Arch = DebdeltaName.substr(NewEnd + 1, DebdeltaName.find(".", NewEnd + 1) - NewEnd - 1);
return PkgName + "_" + NewVersion + "_" + Arch + ".deb";
}
/*}}}*/
/** \brief Wrapper class for testing debdelta */ /*{{{*/
class TestDebdeltaMethod : public DebdeltaMethod {
public:
/** \brief Run debdelta in debug test mode
*
* This method can be used to run the debdelta method outside
* of the "normal" acquire environment for easier testing.
*
* \param base basename of all files involved in this debdelta test
*/
bool Run(char const *debFile, char const *debdeltaFile)
{
if (pkgInitConfig(*_config) == false ||
pkgInitSystem(*_config,_system) == false)
{
std::cerr << "E: Could not initialize the system/configuration." << std::endl;
_error->DumpErrors();
return 100;
}
_config->CndSet("Debug::pkgAcquire::Debdetla", "true");
FetchItem *test = new FetchItem;
test->DestFile = debFile;
test->Uri = debdeltaFile;
test->FailIgnore = false;
test->IndexFile = false;
test->Next = 0;
if (Fetch(test))
{
std::cout << "Result-Deb: " << test->DestFile << std::endl;
return true;
}
return false;
}
};
/*}}}*/
/** \brief Starter for the debdelta method (or its test method) {{{
*
* Used without parameters is the normal behavior for methods for
* the APT acquire system. While this works great for the acquire system
* it is very hard to test the method and therefore the method also
* accepts one parameter which will switch it directly to debug test mode:
*/
int main(int argc, char *argv[])
{
if (argc <= 1)
{
DebdeltaMethod Mth;
return Mth.Run();
}
else
{
TestDebdeltaMethod Mth;
bool result = Mth.Run(argv[1], argv[2]);
_error->DumpErrors();
return result;
}
}
/*}}}*/
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