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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/block-device.h>
#include <sbuild/chroot/facet/lvm-snapshot.h>
#include <sbuild/chroot/facet/factory.h>
#include <sbuild/chroot/facet/session.h>
#include <sbuild/chroot/facet/session-clonable.h>
#include <sbuild/chroot/facet/source-clonable.h>
#ifdef SBUILD_FEATURE_UNION
#include <sbuild/chroot/facet/fsunion.h>
#endif // SBUILD_FEATURE_UNION
#include <sbuild/format-detail.h>
#include <sbuild/util.h>
#include <cassert>
#include <cerrno>
#include <cstring>
#include <boost/format.hpp>
using boost::format;
using namespace sbuild;
namespace sbuild
{
namespace chroot
{
namespace facet
{
namespace
{
factory::facet_info block_device_info =
{
"block-device",
N_("Support for ‘block-device’ chroots"),
false,
[]() -> facet::ptr { return block_device::create(); }
};
factory block_device_register(block_device_info);
}
block_device::block_device ():
block_device_base()
{
}
block_device::~block_device ()
{
}
block_device::block_device (const block_device& rhs):
block_device_base(rhs)
{
}
#ifdef SBUILD_FEATURE_LVMSNAP
block_device::block_device (const lvm_snapshot& rhs):
block_device_base(rhs)
{
}
#endif // SBUILD_FEATURE_LVMSNAP
void
block_device::set_chroot (chroot& chroot,
bool copy)
{
block_device_base::set_chroot(chroot, copy);
#ifdef SBUILD_FEATURE_UNION
if (!copy && !owner->get_facet<fsunion>())
owner->add_facet(fsunion::create());
#endif // SBUILD_FEATURE_UNION
}
std::string const&
block_device::get_name () const
{
static const std::string name("block-device");
return name;
}
block_device::ptr
block_device::create ()
{
return ptr(new block_device());
}
#ifdef SBUILD_FEATURE_LVMSNAP
block_device::ptr
block_device::create (const lvm_snapshot& rhs)
{
return ptr(new block_device(rhs));
}
#endif // SBUILD_FEATURE_LVMSNAP
facet::ptr
block_device::clone () const
{
return ptr(new block_device(*this));
}
void
block_device::setup_lock (chroot::setup_type type,
bool lock,
int status)
{
/* Lock is preserved through the entire session. */
if ((type == chroot::SETUP_START && lock == false) ||
(type == chroot::SETUP_STOP && lock == true))
return;
try
{
if (!stat
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
(this->get_device()).is_character()
#else
(this->get_device()).is_block()
#endif
)
{
throw error(get_device(), chroot::DEVICE_NOTBLOCK);
}
else
{
#ifdef SBUILD_FEATURE_UNION
/* We don't lock the device if fsunion is configured. */
fsunion::const_ptr puni
(owner->get_facet<fsunion>());
#endif // SBUILD_FEATURE_UNION
}
}
catch (sbuild::stat::error const& e) // Failed to stat
{
// Don't throw if stopping a session and the device stat
// failed. This is because the setup scripts shouldn't fail
// to be run if the block device no longer exists, which
// would prevent the session from being ended.
if (type != chroot::SETUP_STOP)
throw;
}
/* 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
block_device::chroot_session_setup (chroot const& parent,
std::string const& session_id,
std::string const& alias,
std::string const& user,
bool root)
{
// Block devices need the mount device name specifying.
mountable::ptr pmnt
(owner->get_facet<mountable>());
if (pmnt)
pmnt->set_mount_device(get_device());
}
}
}
}
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