virtual int execute (Cmdline const &) override
{
throw UnknownCommand ();
}
void tryExternalCommand(char** argv)
{
std::vector<std::string> pathes;
char *execPath = getenv("KDB_EXEC_PATH");
if (execPath)
{
pathes.push_back(execPath);
}
pathes.push_back(buildinExecPath);
for(size_t p = 0; p<pathes.size(); ++p)
{
std::string command;
char* savedArg = 0;
if (pathes[p][0] != '/')
{
// no absolute path, so work with current path
char currentPath [PATH_MAX];
if (!getcwd(currentPath, sizeof(currentPath)))
{
std::cerr << "Could not determine "
<< "current path for path "
<< pathes[p]
<< " and command name: "
<< argv[0]
<< " because: "
<< strerror(errno)
<< std::endl;
continue;
}
command += currentPath;
command += "/";
}
command += pathes[p];
command += "/";
command += argv[0];
struct stat buf;
if (stat(command.c_str(), &buf) == -1)
{
if (errno == ENOENT)
{
// the file simply does not exist
// so it seems like it is an
// UnknownCommand
continue;
}
else
{
std::cerr << "The external command "
<< command
<< " could not be found, because: "
<< strerror(errno)
<< std::endl;
continue;
}
}
savedArg = argv[0];
argv[0] = const_cast<char*>(command.c_str());
execve(command.c_str(), argv, environ);
std::cerr << "Could not execute external command "
<< command
<< " because: " << strerror(errno)
<< std::endl;
argv[0] = savedArg;
}
throw UnknownCommand();
}
