def _run_dog(self, command, subcommand, *params):
cmd = ('env', 'LC_ALL=C', 'LANG=C', 'dog', command, subcommand, '-a',
self.addr, '-p', self.port) + params
try:
return utils.execute(*cmd)
except OSError as e:
with excutils.save_and_reraise_exception():
if e.errno == errno.ENOENT:
msg = _LE('Sheepdog is not installed. '
'OSError: command is %s.')
else:
msg = _LE('OSError: command is %s.')
LOG.error(msg, cmd)
except processutils.ProcessExecutionError as e:
_stderr = e.stderr
if _stderr.startswith(self.DOG_RESP_CONNECTION_ERROR):
reason = (_('Failed to connect to sheep daemon. '
'addr: %(addr)s, port: %(port)s'), {
'addr': self.addr,
'port': self.port
})
raise exception.SheepdogError(reason=reason)
raise exception.SheepdogCmdError(
cmd=e.cmd,
exit_code=e.exit_code,
stdout=e.stdout.replace('\n', '\\n'),
stderr=e.stderr.replace('\n', '\\n'))
def backup_volume(self, context, backup, backup_service):
"""Create a new backup from an existing volume."""
src_volume = self.db.volume_get(context, backup.volume_id)
temp_snapshot_name = 'tmp-snap-%s' % src_volume.name
# NOTE(tishizaki): If previous backup_volume operation has failed,
# a temporary snapshot for previous operation may exist.
# So, the old snapshot must be deleted before backup_volume.
# Sheepdog 0.9 or later 'delete_snapshot' operation
# is done successfully, although target snapshot does not exist.
# However, sheepdog 0.8 or before 'delete_snapshot' operation
# is failed, and raise ProcessExecutionError when target snapshot
# does not exist.
try:
self.client.delete_snapshot(src_volume.name, temp_snapshot_name)
except (exception.SheepdogCmdError):
pass
try:
self.client.create_snapshot(src_volume.name, temp_snapshot_name)
except (exception.SheepdogCmdError, OSError):
msg = (_('Failed to create a temporary snapshot for volume %s.') %
src_volume.id)
LOG.exception(msg)
raise exception.SheepdogError(reason=msg)
try:
sheepdog_fd = SheepdogIOWrapper(self.addr, self.port, src_volume,
temp_snapshot_name)
backup_service.backup(backup, sheepdog_fd)
finally:
self.client.delete_snapshot(src_volume.name, temp_snapshot_name)
def delete_snapshot(self, vdiname, snapname):
try:
(_stdout, _stderr) = self._run_dog('vdi', 'delete', '-s', snapname,
vdiname)
if _stderr.rstrip().endswith(self.DOG_RESP_SNAPSHOT_NOT_FOUND):
LOG.warning(_LW('Snapshot "%s" not found.'), snapname)
elif _stderr.rstrip().endswith(self.DOG_RESP_VDI_NOT_FOUND):
LOG.warning(_LW('Volume "%s" not found.'), vdiname)
elif _stderr.startswith(self.DOG_RESP_CONNECTION_ERROR):
# NOTE(tishizaki)
# Dog command does not return error_code although
# dog command cannot connect to sheep process.
# That is a Sheepdog's bug.
# To avoid a Sheepdog's bug, now we need to check stderr.
# If Sheepdog has been fixed, this check logic is needed
# by old Sheepdog users.
reason = (_('Failed to connect to sheep daemon. '
'addr: %(addr)s, port: %(port)s'), {
'addr': self.addr,
'port': self.port
})
raise exception.SheepdogError(reason=reason)
except exception.SheepdogCmdError as e:
cmd = e.kwargs['cmd']
_stderr = e.kwargs['stderr']
with excutils.save_and_reraise_exception():
LOG.error(_LE('Failed to delete snapshot. (command: %s)'), cmd)
def check_cluster_status(self):
try:
(_stdout, _stderr) = self._run_dog('cluster', 'info')
except exception.SheepdogCmdError as e:
cmd = e.kwargs['cmd']
_stderr = e.kwargs['stderr']
with excutils.save_and_reraise_exception():
if _stderr.startswith(self.DOG_RESP_CONNECTION_ERROR):
msg = _LE('Failed to connect to sheep daemon. '
'addr: %(addr)s, port: %(port)s')
LOG.error(msg, {'addr': self.addr, 'port': self.port})
else:
LOG.error(_LE('Failed to check cluster status.'
'(command: %s)'), cmd)
if _stdout.startswith(self.DOG_RESP_CLUSTER_RUNNING):
LOG.debug('Sheepdog cluster is running.')
return
reason = _('Invalid sheepdog cluster status.')
if _stdout.startswith(self.DOG_RESP_CLUSTER_NOT_FORMATTED):
reason = _('Cluster is not formatted. '
'You should probably perform "dog cluster format".')
elif _stdout.startswith(self.DOG_RESP_CLUSTER_WAITING):
reason = _('Waiting for all nodes to join cluster. '
'Ensure all sheep daemons are running.')
raise exception.SheepdogError(reason=reason)
def _run_dog(self, command, subcommand, *params):
"""Execute dog command wrapper."""
addr = self.get_addr()
cmd = ('env', 'LC_ALL=C', 'LANG=C', 'dog', command, subcommand, '-a',
addr, '-p', self.port) + params
try:
(_stdout, _stderr) = utils.execute(*cmd)
if _stderr.startswith(self.DOG_RESP_CONNECTION_ERROR):
# NOTE(tishizaki)
# Dog command does not return error_code although
# dog command cannot connect to sheep process.
# That is a Sheepdog's bug.
# To avoid a Sheepdog's bug, now we need to check stderr.
# If Sheepdog has been fixed, this check logic is needed
# by old Sheepdog users.
reason = (_('Failed to connect to sheep daemon. '
'addr: %(addr)s, port: %(port)s'), {
'addr': addr,
'port': self.port
})
raise exception.SheepdogError(reason=reason)
return (_stdout, _stderr)
except OSError as e:
with excutils.save_and_reraise_exception():
if e.errno == errno.ENOENT:
msg = _LE('Sheepdog is not installed. '
'OSError: command is %s.')
else:
msg = _LE('OSError: command is %s.')
LOG.error(msg, cmd)
except processutils.ProcessExecutionError as e:
_stderr = e.stderr
if _stderr.startswith(self.DOG_RESP_CONNECTION_ERROR):
reason = (_('Failed to connect to sheep daemon. '
'addr: %(addr)s, port: %(port)s'), {
'addr': addr,
'port': self.port
})
raise exception.SheepdogError(reason=reason)
raise exception.SheepdogCmdError(
cmd=e.cmd,
exit_code=e.exit_code,
stdout=e.stdout.replace('\n', '\\n'),
stderr=e.stderr.replace('\n', '\\n'))
def check_cluster_status(self):
try:
(_stdout, _stderr) = self._run_dog('cluster', 'info')
except exception.SheepdogCmdError as e:
cmd = e.kwargs['cmd']
with excutils.save_and_reraise_exception():
LOG.error('Failed to check cluster status.'
'(command: %s)', cmd)
if _stdout.startswith(self.DOG_RESP_CLUSTER_RUNNING):
LOG.debug('Sheepdog cluster is running.')
return
reason = _('Invalid sheepdog cluster status.')
if _stdout.startswith(self.DOG_RESP_CLUSTER_NOT_FORMATTED):
reason = _('Cluster is not formatted. '
'You should probably perform "dog cluster format".')
elif _stdout.startswith(self.DOG_RESP_CLUSTER_WAITING):
reason = _('Waiting for all nodes to join cluster. '
'Ensure all sheep daemons are running.')
raise exception.SheepdogError(reason=reason)
def _run_qemu_img(self, command, *params):
"""Executes qemu-img command wrapper."""
addr = self.get_addr()
cmd = ['env', 'LC_ALL=C', 'LANG=C', 'qemu-img', command]
for param in params:
if param.startswith(self.QEMU_SHEEPDOG_PREFIX):
# replace 'sheepdog:vdiname[:snapshotname]' to
# 'sheepdog:addr:port:vdiname[:snapshotname]'
param = param.replace(
self.QEMU_SHEEPDOG_PREFIX,
'%(prefix)s%(addr)s:%(port)s:' % {
'prefix': self.QEMU_SHEEPDOG_PREFIX,
'addr': addr,
'port': self.port
}, 1)
cmd.append(param)
try:
return utils.execute(*cmd)
except OSError as e:
with excutils.save_and_reraise_exception():
if e.errno == errno.ENOENT:
msg = ('Qemu-img is not installed. OSError: command is '
'%(cmd)s.')
else:
msg = 'OSError: command is %(cmd)s.'
LOG.error(msg, {'cmd': tuple(cmd)})
except processutils.ProcessExecutionError as e:
_stderr = e.stderr
if self.QEMU_IMG_RESP_CONNECTION_ERROR in _stderr:
reason = (_('Failed to connect to sheep daemon. '
'addr: %(addr)s, port: %(port)s'), {
'addr': addr,
'port': self.port
})
raise exception.SheepdogError(reason=reason)
raise exception.SheepdogCmdError(
cmd=e.cmd,
exit_code=e.exit_code,
stdout=e.stdout.replace('\n', '\\n'),
stderr=e.stderr.replace('\n', '\\n'))