def build_snapshot(config, logical_volume, suppress_tmpdir=False):
"""Create a snapshot process for running through the various steps
of creating, mounting, unmounting and removing a snapshot
"""
snapshot_name = config['snapshot-name'] or \
logical_volume.lv_name + '_snapshot'
extent_size = int(logical_volume.vg_extent_size)
snapshot_size = config['snapshot-size']
if not snapshot_size:
snapshot_size = min(
int(logical_volume.vg_free_count),
(int(logical_volume.lv_size) * 0.2) / extent_size,
(15 * 1024**3) / extent_size,
)
LOG.info("Auto-sizing snapshot-size to %s (%d extents)",
format_bytes(snapshot_size * extent_size), snapshot_size)
if snapshot_size < 1:
raise BackupError(
"Insufficient free extents on %s "
"to create snapshot (free extents = %s)" %
(logical_volume.device_name(), logical_volume.vg_free_count))
else:
try:
_snapshot_size = snapshot_size
snapshot_size = parse_bytes(snapshot_size) / extent_size
LOG.info(
"Using requested snapshot-size %s "
"rounded by extent-size %s to %s.", _snapshot_size,
format_bytes(extent_size),
format_bytes(snapshot_size * extent_size))
if snapshot_size < 1:
raise BackupError("Requested snapshot-size (%s) is "
"less than 1 extent" % _snapshot_size)
if snapshot_size > int(logical_volume.vg_free_count):
LOG.info(
"Snapshot size requested %s, but only %s available.",
config['snapshot-size'],
format_bytes(int(logical_volume.vg_free_count) *
extent_size,
precision=4))
LOG.info(
"Truncating snapshot-size to %d extents (%s)",
int(logical_volume.vg_free_count),
format_bytes(int(logical_volume.vg_free_count) *
extent_size,
precision=4))
snapshot_size = int(logical_volume.vg_free_count)
except ValueError, exc:
raise BackupError("Problem parsing snapshot-size %s" % exc)
def build_snapshot(config, logical_volume):
"""Create a snapshot process for running through the various steps
of creating, mounting, unmounting and removing a snapshot
"""
snapshot_name = config["snapshot-name"] or logical_volume.lv_name + "_snapshot"
extent_size = int(logical_volume.vg_extent_size)
snapshot_size = config["snapshot-size"]
if not snapshot_size:
snapshot_size = min(
int(logical_volume.vg_free_count),
(int(logical_volume.lv_size) * 0.2) / extent_size,
(15 * 1024 ** 3) / extent_size,
)
LOG.info(
"Auto-sizing snapshot-size to %s (%d extents)", format_bytes(snapshot_size * extent_size), snapshot_size
)
if snapshot_size < 1:
raise BackupError(
"Insufficient free extents on %s "
"to create snapshot (free extents = %s)" % (logical_volume.device_name(), logical_volume.vg_free_count)
)
else:
try:
_snapshot_size = snapshot_size
snapshot_size = parse_bytes(snapshot_size) / extent_size
LOG.info(
"Using requested snapshot-size %s " "rounded by extent-size %s to %s.",
_snapshot_size,
format_bytes(extent_size),
format_bytes(snapshot_size * extent_size),
)
if snapshot_size < 1:
raise BackupError("Requested snapshot-size (%s) is " "less than 1 extent" % _snapshot_size)
if snapshot_size > int(logical_volume.vg_free_count):
LOG.info(
"Snapshot size requested %s, but only %s available.",
config["snapshot-size"],
format_bytes(int(logical_volume.vg_free_count) * extent_size, precision=4),
)
LOG.info(
"Truncating snapshot-size to %d extents (%s)",
int(logical_volume.vg_free_count),
format_bytes(int(logical_volume.vg_free_count) * extent_size, precision=4),
)
snapshot_size = int(logical_volume.vg_free_count)
except ValueError, exc:
raise BackupError("Problem parsing snapshot-size %s" % exc)
def build_snapshot(config, logical_volume, suppress_tmpdir=False):
"""Create a snapshot process for running through the various steps
of creating, mounting, unmounting and removing a snapshot
"""
snapshot_name = config['snapshot-name'] or \
logical_volume.lv_name + '_snapshot'
extent_size = int(logical_volume.vg_extent_size)
snapshot_size = config['snapshot-size']
if not snapshot_size:
snapshot_size = min(
int(logical_volume.vg_free_count),
(int(logical_volume.lv_size) * 0.2) / extent_size,
(15 * 1024**3) / extent_size,
)
LOG.info("Auto-sizing snapshot-size to %s (%d extents)",
format_bytes(snapshot_size * extent_size), snapshot_size)
if snapshot_size < 1:
raise BackupError(
"Insufficient free extents on %s "
"to create snapshot (free extents = %s)" %
(logical_volume.device_name(), logical_volume.vg_free_count))
else:
try:
_snapshot_size = snapshot_size
snapshot_size = parse_bytes(snapshot_size) / extent_size
LOG.info(
"Using requested snapshot-size %s "
"rounded by extent-size %s to %s.", _snapshot_size,
format_bytes(extent_size),
format_bytes(snapshot_size * extent_size))
if snapshot_size < 1:
raise BackupError("Requested snapshot-size (%s) is "
"less than 1 extent" % _snapshot_size)
if snapshot_size > int(logical_volume.vg_free_count):
LOG.info(
"Snapshot size requested %s, but only %s available.",
config['snapshot-size'],
format_bytes(int(logical_volume.vg_free_count) *
extent_size,
precision=4))
LOG.info(
"Truncating snapshot-size to %d extents (%s)",
int(logical_volume.vg_free_count),
format_bytes(int(logical_volume.vg_free_count) *
extent_size,
precision=4))
snapshot_size = int(logical_volume.vg_free_count)
except ValueError as exc:
raise BackupError("Problem parsing snapshot-size %s" % exc)
mountpoint = config['snapshot-mountpoint']
tempdir = False
if not mountpoint:
tempdir = True
if not suppress_tmpdir:
mountpoint = tempfile.mkdtemp()
else:
try:
os.makedirs(mountpoint)
LOG.info("Created mountpoint %s", mountpoint)
except OSError as exc:
# silently ignore if the mountpoint already exists
if exc.errno != errno.EEXIST:
raise BackupError("Failure creating snapshot mountpoint: %s" %
str(exc))
snapshot = Snapshot(snapshot_name, int(snapshot_size), mountpoint)
if tempdir:
snapshot.register('finish',
lambda *args, **kwargs: cleanup_tempdir(mountpoint))
return snapshot
def build_snapshot(config, logical_volume, suppress_tmpdir=False):
"""Create a snapshot process for running through the various steps
of creating, mounting, unmounting and removing a snapshot
"""
snapshot_name = config["snapshot-name"] or logical_volume.lv_name + "_snapshot"
extent_size = int(logical_volume.vg_extent_size)
snapshot_size = config["snapshot-size"]
if not snapshot_size:
snapshot_size = min(
int(logical_volume.vg_free_count),
(int(logical_volume.lv_size) * 0.2) / extent_size,
(15 * 1024 ** 3) / extent_size,
)
LOG.info(
"Auto-sizing snapshot-size to %s (%d extents)",
format_bytes(snapshot_size * extent_size),
snapshot_size,
)
if snapshot_size < 1:
raise BackupError(
"Insufficient free extents on %s "
"to create snapshot (free extents = %s)"
% (logical_volume.device_name(), logical_volume.vg_free_count)
)
else:
try:
_snapshot_size = snapshot_size
snapshot_size = parse_bytes(snapshot_size) / extent_size
LOG.info(
"Using requested snapshot-size %s " "rounded by extent-size %s to %s.",
_snapshot_size,
format_bytes(extent_size),
format_bytes(snapshot_size * extent_size),
)
if snapshot_size < 1:
raise BackupError(
"Requested snapshot-size (%s) is " "less than 1 extent" % _snapshot_size
)
if snapshot_size > int(logical_volume.vg_free_count):
LOG.info(
"Snapshot size requested %s, but only %s available.",
config["snapshot-size"],
format_bytes(int(logical_volume.vg_free_count) * extent_size, precision=4),
)
LOG.info(
"Truncating snapshot-size to %d extents (%s)",
int(logical_volume.vg_free_count),
format_bytes(int(logical_volume.vg_free_count) * extent_size, precision=4),
)
snapshot_size = int(logical_volume.vg_free_count)
except ValueError as exc:
raise BackupError("Problem parsing snapshot-size %s" % exc)
mountpoint = config["snapshot-mountpoint"]
tempdir = False
if not mountpoint:
tempdir = True
if not suppress_tmpdir:
mountpoint = tempfile.mkdtemp()
else:
try:
os.makedirs(mountpoint)
LOG.info("Created mountpoint %s", mountpoint)
except OSError as exc:
# silently ignore if the mountpoint already exists
if exc.errno != errno.EEXIST: # pylint: disable=no-member
raise BackupError("Failure creating snapshot mountpoint: %s" % str(exc))
snapshot = Snapshot(snapshot_name, int(snapshot_size), mountpoint)
if tempdir:
snapshot.register("finish", lambda *args, **kwargs: cleanup_tempdir(mountpoint))
return snapshot