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/* Copyright © 2005-2013 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 3 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, see
* <http://www.gnu.org/licenses/>.
*
*********************************************************************/
#include <config.h>
#include <sbuild/chroot/facet/factory.h>
#include <sbuild/chroot/facet/fsunion.h>
#include <sbuild/chroot/facet/loopback.h>
#include <sbuild/chroot/facet/mountable.h>
#include <sbuild/chroot/facet/session.h>
#include <sbuild/format-detail.h>
#include <cassert>
#include <cerrno>
#include <boost/format.hpp>
using std::endl;
using boost::format;
using namespace sbuild;
namespace sbuild
{
namespace chroot
{
namespace facet
{
namespace
{
factory::facet_info loopback_info =
{
"loopback",
N_("Support for ‘loopback’ chroots"),
false,
[]() -> facet::ptr { return loopback::create(); }
};
factory loopback_register(loopback_info);
}
loopback::loopback ():
storage(),
filename()
{
}
loopback::loopback (const loopback& rhs):
storage(rhs),
filename(rhs.filename)
{
}
loopback::~loopback ()
{
}
void
loopback::set_chroot (chroot& chroot,
bool copy)
{
storage::set_chroot(chroot);
if (!copy && !owner->get_facet<mountable>())
owner->add_facet(mountable::create());
#ifdef SBUILD_FEATURE_UNION
if (!copy && !owner->get_facet<fsunion>())
owner->add_facet(fsunion::create());
#endif // SBUILD_FEATURE_UNION
}
std::string const&
loopback::get_name () const
{
static const std::string name("loopback");
return name;
}
loopback::ptr
loopback::create ()
{
return ptr(new loopback());
}
facet::ptr
loopback::clone () const
{
return ptr(new loopback(*this));
}
std::string const&
loopback::get_filename () const
{
return this->filename;
}
void
loopback::set_filename (std::string const& filename)
{
if (!is_absname(filename))
throw error(filename, chroot::FILE_ABS);
this->filename = filename;
}
std::string
loopback::get_path () const
{
mountable::const_ptr pmnt
(owner->get_facet<mountable>());
std::string path(owner->get_mount_location());
if (pmnt)
path += pmnt->get_location();
return path;
}
void
loopback::setup_env (environment& env) const
{
storage::setup_env(env);
env.add("CHROOT_FILE", get_filename());
}
void
loopback::setup_lock (chroot::setup_type type,
bool lock,
int status)
{
// Check ownership and permissions.
if (type == chroot::SETUP_START && lock == true)
{
stat file_status(this->filename);
// NOTE: taken from chroot_config::check_security.
if (file_status.uid() != 0)
throw error(this->filename, chroot::FILE_OWNER);
if (file_status.check_mode(stat::PERM_OTHER_WRITE))
throw error(this->filename, chroot::FILE_PERMS);
if (!file_status.is_regular())
throw error(this->filename, chroot::FILE_NOTREG);
}
/* Create or unlink session information. */
if ((type == chroot::SETUP_START && lock == true) ||
(type == chroot::SETUP_STOP && lock == false && status == 0))
{
bool start = (type == chroot::SETUP_START);
owner->get_facet_strict<session>()->setup_session_info(start);
}
}
void
loopback::get_details (format_detail& detail) const
{
storage::get_details(detail);
if (!this->filename.empty())
detail.add(_("File"), get_filename());
}
void
loopback::get_used_keys (string_list& used_keys) const
{
storage::get_used_keys(used_keys);
used_keys.push_back("file");
}
void
loopback::get_keyfile (keyfile& keyfile) const
{
storage::get_keyfile(keyfile);
keyfile::set_object_value(*this, &loopback::get_filename,
keyfile, owner->get_name(), "file");
}
void
loopback::set_keyfile (keyfile const& keyfile)
{
storage::set_keyfile(keyfile);
keyfile::get_object_value(*this, &loopback::set_filename,
keyfile, owner->get_name(), "file",
keyfile::PRIORITY_REQUIRED);
}
void
loopback::chroot_session_setup (chroot const& parent,
std::string const& session_id,
std::string const& alias,
std::string const& user,
bool root)
{
// Loopback chroots need the mount device name specifying.
mountable::ptr pmnt
(owner->get_facet<mountable>());
if (pmnt)
pmnt->set_mount_device(get_filename());
}
}
}
}
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