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/* Copyright © 2006 Roger Leigh <rleigh@debian.org>
*
* schroot is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* schroot is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
*********************************************************************/
#ifndef SBUILD_PERSONALITY_H
#define SBUILD_PERSONALITY_H
#include <sbuild/sbuild-custom-error.h>
#include <map>
#include <ostream>
#include <string>
namespace sbuild
{
/**
* Chroot personality. A chroot may have a personality (also knows
* as a process execution domain) which is used to run non-native
* binaries. For example, running 32-bit Linux binaries on a 64-bit
* Linux system, or an SVR4 binary on a 32-bit Linux system. This
* is currently a Linux only feature; it does nothing on non-Linux
* systems. This is a wrapper around the personality(2) system
* call.
*/
class personality
{
public:
/// Personality type.
typedef unsigned long type;
/// Error codes.
enum error_code
{
BAD, ///< Personality is unknown.
SET ///< Could not set personality.
};
/// Exception type.
typedef custom_error<error_code> error;
/**
* The constructor. On Linux systems, this is initialised with
* the current process' personality. On non-Linux systems, it is
* initialised as "undefined".
*/
personality ();
/**
* The constructor.
*
* @param persona the persona to set.
*/
personality (type persona);
/**
* The constructor.
*
* @param persona the persona to set.
*/
personality (std::string const& persona);
///* The destructor.
~personality ();
/**
* Get the name of the personality.
*
* @returns the personality name.
*/
std::string const& get_name () const;
/**
* Get the personality.
*
* @returns the personality.
*/
type
get () const;
/**
* Set the process personality. This sets the personality (if valid) using
* the personality(2) system call. If setting the personality
* fails, an error is thown.
*/
void
set () const;
/**
* Print a list of the available personalities.
*
* @returns a string of the available personalities.
*/
static std::string
get_personalities ();
/**
* Get the personality name from a stream.
*
* @param stream the stream to get input from.
* @param rhs the personality to set.
* @returns the stream.
*/
template <class charT, class traits>
friend
std::basic_istream<charT,traits>&
operator >> (std::basic_istream<charT,traits>& stream,
personality& rhs)
{
std::string personality_name;
if (std::getline(stream, personality_name))
{
rhs.persona = find_personality(personality_name);
if (rhs.get_name() == "undefined" &&
rhs.get_name() != personality_name)
{
personality::error e(personality_name, personality::BAD);
e.set_reason(personality::get_personalities());
throw e;
}
}
return stream;
}
/**
* Print the personality name to a stream.
*
* @param stream the stream to output to.
* @param rhs the personality to output.
* @returns the stream.
*/
template <class charT, class traits>
friend
std::basic_ostream<charT,traits>&
operator << (std::basic_ostream<charT,traits>& stream,
personality const& rhs)
{
return stream << find_personality(rhs.persona);
}
private:
/**
* Find a personality by name.
*
* @param persona the personality to find.
* @returns the personality type; this is -1 if the personality
* was undefined, or -2 if the personality was unknown (not
* found).
*/
static type
find_personality (std::string const& persona);
/**
* Find a personality by number.
*
* @param persona the personality to find.
* @returns the personality name, "undefined" if the personality was
* not defined, or "unknown" if the personality was not found.
*/
static std::string const&
find_personality (type persona);
/// The personality type.
type persona;
/// Mapping between personality name and type.
static std::map<std::string,type> personalities;
};
}
#endif /* SBUILD_PERSONALITY_H */
/*
* Local Variables:
* mode:C++
* End:
*/
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