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sbuild-chroot-lvm-snapshot.cc

/* Copyright © 2005-2006  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
 *
 *********************************************************************/

#include <config.h>

#include "sbuild.h"

#include <cerrno>
#include <iostream>

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/sysmacros.h>
#include <unistd.h>

#include <boost/format.hpp>

using std::endl;
using boost::format;
using namespace sbuild;

00038 chroot_lvm_snapshot::chroot_lvm_snapshot ():
  chroot_block_device(),
  chroot_source(),
  snapshot_device(),
  snapshot_options()
{
  set_run_setup_scripts(true);
  set_run_exec_scripts(true);
}

00048 chroot_lvm_snapshot::~chroot_lvm_snapshot ()
{
}

sbuild::chroot::ptr
00053 chroot_lvm_snapshot::clone () const
{
  return ptr(new chroot_lvm_snapshot(*this));
}

sbuild::chroot::ptr
chroot_lvm_snapshot::clone_source () const
{
  ptr clone(new chroot_block_device(*this));

  chroot_source::clone_source_setup(clone);

  return clone;
}

std::string const&
00069 chroot_lvm_snapshot::get_snapshot_device () const
{
  return this->snapshot_device;
}

void
00075 chroot_lvm_snapshot::set_snapshot_device (std::string const& snapshot_device)
{
  this->snapshot_device = snapshot_device;
}

std::string const&
00081 chroot_lvm_snapshot::get_mount_device () const
{
  return this->snapshot_device;
}

std::string const&
00087 chroot_lvm_snapshot::get_snapshot_options () const
{
  return this->snapshot_options;
}

void
00093 chroot_lvm_snapshot::set_snapshot_options (std::string const& snapshot_options)
{
  this->snapshot_options = snapshot_options;
}

std::string const&
00099 chroot_lvm_snapshot::get_chroot_type () const
{
  static const std::string type("lvm-snapshot");

  return type;
}

void
00107 chroot_lvm_snapshot::setup_env (environment& env)
{
  chroot_block_device::setup_env(env);
  chroot_source::setup_env(env);

  env.add("CHROOT_LVM_SNAPSHOT_NAME", sbuild::basename(get_snapshot_device()));
  env.add("CHROOT_LVM_SNAPSHOT_DEVICE", get_snapshot_device());
  env.add("CHROOT_LVM_SNAPSHOT_OPTIONS", get_snapshot_options());
}

void
00118 chroot_lvm_snapshot::setup_lock (setup_type type,
                         bool       lock)
{
  std::string device;
  struct stat statbuf;

  /* Lock is removed by setup script on setup stop.  Unlocking here
     would fail: the LVM snapshot device no longer exists. */
  if (!(type == SETUP_STOP && lock == false))
    {
      if (type == SETUP_START)
      device = get_device();
      else
      device = get_snapshot_device();

      if (device.empty())
      {
        format fmt(_("%1% chroot: device name not set"));
        fmt % get_name();
        throw error(fmt);
      }
      else if (stat(device.c_str(), &statbuf) == -1)
      {
        format fmt(_("%1% chroot: failed to stat device %2%: %3%"));
        fmt % get_name() % device % strerror(errno);
        throw error(fmt);
      }
      else if (!S_ISBLK(statbuf.st_mode))
      {
        format fmt(_("%1% chroot: %2% is not a block device\n"));
        fmt % get_name() % device;
        throw error(fmt);
      }
      else
      {
        /* Lock is preserved while running a command. */
        if ((type == EXEC_START && lock == false) ||
            (type == EXEC_STOP && lock == true))
          return;

        sbuild::device_lock dlock(device);
        if (lock)
          {
            try
            {
              dlock.set_lock(lock::LOCK_EXCLUSIVE, 15);
            }
            catch (sbuild::lock::error const& e)
            {
              format fmt(_("%1%: failed to lock device: %2%"));
              fmt % device % e.what();
              throw error(fmt);
            }
          }
        else
          {
            try
            {
              dlock.unset_lock();
            }
            catch (sbuild::lock::error const& e)
            {
              format fmt(_("%1%: failed to unlock device: %2%"));
              fmt % device % e.what();
              throw error(fmt);
            }
          }
      }
    }

  /* Create or unlink session information. */
  if ((type == SETUP_START && lock == true) ||
      (type == SETUP_STOP && lock == false))
    {
      bool start = (type == SETUP_START);
      setup_session_info(start);
    }
}

sbuild::chroot::session_flags
00198 chroot_lvm_snapshot::get_session_flags () const
{
  return SESSION_CREATE;
}

void
00204 chroot_lvm_snapshot::print_details (std::ostream& stream) const
{
  chroot_block_device::print_details(stream);
  chroot_source::print_details(stream);

  if (!this->snapshot_device.empty())
    stream << format_details(_("LVM Snapshot Device"),
                       get_snapshot_device());
  if (!this->snapshot_options.empty())
    stream << format_details(_("LVM Snapshot Options"),
                       get_snapshot_options());
  stream << std::flush;
}

void
00219 chroot_lvm_snapshot::get_keyfile (keyfile& keyfile) const
{
  chroot_block_device::get_keyfile(keyfile);
  chroot_source::get_keyfile(keyfile);

  keyfile.set_value(get_name(), "lvm-snapshot-device",
                get_snapshot_device());

  keyfile.set_value(get_name(), "lvm-snapshot-options",
                get_snapshot_options());
}

void
00232 chroot_lvm_snapshot::set_keyfile (keyfile const& keyfile)
{
  chroot_block_device::set_keyfile(keyfile);
  chroot_source::set_keyfile(keyfile);

  std::string snapshot_device;
  if (keyfile.get_value(get_name(), "lvm-snapshot-device",
                  get_active() ?
                  keyfile::PRIORITY_REQUIRED :
                  keyfile::PRIORITY_DISALLOWED,
                  snapshot_device))
    set_snapshot_device(snapshot_device);

  std::string snapshot_options;
  if (keyfile.get_value(get_name(), "lvm-snapshot-options",
                  keyfile::PRIORITY_REQUIRED, snapshot_options))
    set_snapshot_options(snapshot_options);
}

/*
 * Local Variables:
 * mode:C++
 * End:
 */

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