def supports_vdo():
cmd = ['segtypes']
rc, out, err = call(cmd)
if rc == 0:
if "vdo" in out:
log_debug("We have VDO support")
return True
return False
def refresh(self, log=True):
"""
Go out and query lvm for the latest data in as few trips as possible
:param log Add debug log entry/exit messages
:return: None
"""
self.num_refreshes += 1
if log:
log_debug("lvmdb - refresh entry")
# Grab everything first then parse it
if self.json:
# Do a single lvm retrieve for everything in json
a = cmdhandler.lvm_full_report_json()
_pvs, _pvs_lookup, _pvs_in_vgs = self._parse_pvs_json(a)
_vgs, _vgs_lookup = self._parse_vgs_json(a)
_lvs, _lvs_in_vgs, _lvs_hidden, _lvs_lookup = self._parse_lvs_json(
a)
else:
_raw_pvs = cmdhandler.pv_retrieve_with_segs()
_raw_vgs = cmdhandler.vg_retrieve(None)
_raw_lvs = cmdhandler.lv_retrieve_with_segments()
_pvs, _pvs_lookup, _pvs_in_vgs = self._parse_pvs(_raw_pvs)
_vgs, _vgs_lookup = self._parse_vgs(_raw_vgs)
_lvs, _lvs_in_vgs, _lvs_hidden, _lvs_lookup = self._parse_lvs(
_raw_lvs)
# Set all
self.pvs = _pvs
self.pv_path_to_uuid = _pvs_lookup
self.vg_name_to_uuid = _vgs_lookup
self.lv_full_name_to_uuid = _lvs_lookup
self.vgs = _vgs
self.lvs = _lvs
self.lvs_in_vgs = _lvs_in_vgs
self.pvs_in_vgs = _pvs_in_vgs
self.lvs_hidden = _lvs_hidden
# Create lookup table for which LV and segments are on each PV
self.pv_lvs, self.lv_pvs = self._parse_pv_in_lvs()
if log:
log_debug("lvmdb - refresh exit")
def _read_until_prompt(self):
stdout = ""
report = ""
stderr = ""
# Try reading from all FDs to prevent one from filling up and causing
# a hang. We are also assuming that we won't get the lvm prompt back
# until we have already received all the output from stderr and the
# report descriptor too.
while not stdout.endswith(SHELL_PROMPT):
try:
rd_fd = [
self.lvm_shell.stdout.fileno(), self.report_r,
self.lvm_shell.stderr.fileno()
]
ready = select.select(rd_fd, [], [], 2)
for r in ready[0]:
if r == self.lvm_shell.stdout.fileno():
while True:
tmp = self.lvm_shell.stdout.read()
if tmp:
stdout += tmp.decode("utf-8")
else:
break
elif r == self.report_r:
while True:
tmp = os.read(self.report_r, 16384)
if tmp:
report += tmp.decode("utf-8")
if len(tmp) != 16384:
break
elif r == self.lvm_shell.stderr.fileno():
while True:
tmp = self.lvm_shell.stderr.read()
if tmp:
stderr += tmp.decode("utf-8")
else:
break
except IOError as ioe:
log_debug(str(ioe))
pass
return stdout, report, stderr
def pv_retrieve_with_segs(device=None):
d = []
err = ""
out = ""
rc = 0
columns = [
'pv_name', 'pv_uuid', 'pv_fmt', 'pv_size', 'pv_free', 'pv_used',
'dev_size', 'pv_mda_size', 'pv_mda_free', 'pv_ba_start', 'pv_ba_size',
'pe_start', 'pv_pe_count', 'pv_pe_alloc_count', 'pv_attr', 'pv_tags',
'vg_name', 'vg_uuid', 'pvseg_start', 'pvseg_size', 'segtype',
'pv_missing'
]
# Lvm has some issues where it returns failure when querying pvs when other
# operations are in process, see:
# https://bugzilla.redhat.com/show_bug.cgi?id=1274085
for i in range(0, 10):
cmd = _dc('pvs', ['-o', ','.join(columns)])
if device:
cmd.extend(device)
rc, out, err = call(cmd)
if rc == 0:
d = parse_column_names(out, columns)
break
else:
time.sleep(0.2)
log_debug("LVM Bug workaround, retrying pvs command...")
if rc != 0:
msg = "We were unable to get pvs to return without error after " \
"trying 10 times, RC=%d, STDERR=(%s), STDOUT=(%s)" % \
(rc, err, out)
log_error(msg)
raise RuntimeError(msg)
return d
def pv_retrieve_with_segs(device=None):
d = []
err = ""
out = ""
rc = 0
columns = ['pv_name', 'pv_uuid', 'pv_fmt', 'pv_size', 'pv_free',
'pv_used', 'dev_size', 'pv_mda_size', 'pv_mda_free',
'pv_ba_start', 'pv_ba_size', 'pe_start', 'pv_pe_count',
'pv_pe_alloc_count', 'pv_attr', 'pv_tags', 'vg_name',
'vg_uuid', 'pvseg_start', 'pvseg_size', 'segtype', 'pv_missing']
# Lvm has some issues where it returns failure when querying pvs when other
# operations are in process, see:
# https://bugzilla.redhat.com/show_bug.cgi?id=1274085
for i in range(0, 10):
cmd = _dc('pvs', ['-o', ','.join(columns)])
if device:
cmd.extend(device)
rc, out, err = call(cmd)
if rc == 0:
d = parse_column_names(out, columns)
break
else:
time.sleep(0.2)
log_debug("LVM Bug workaround, retrying pvs command...")
if rc != 0:
msg = "We were unable to get pvs to return without error after " \
"trying 10 times, RC=%d, STDERR=(%s), STDOUT=(%s)" % \
(rc, err, out)
log_error(msg)
raise RuntimeError(msg)
return d
def call_lvm(command, debug=False, line_cb=None,
cb_data=None):
"""
Call an executable and return a tuple of exitcode, stdout, stderr
:param command: Command to execute
:param debug: Dump debug to stdout
:param line_cb: Call the supplied function for each line read from
stdin, CALL MUST EXECUTE QUICKLY and not *block*
otherwise call_lvm function will fail to read
stdin/stdout. Return value of call back is ignored
:param cb_data: Supplied to callback to allow caller access to
its own data
# Callback signature
def my_callback(my_context, line_read_stdin)
pass
"""
# Prepend the full lvm executable so that we can run different versions
# in different locations on the same box
command.insert(0, cfg.LVM_CMD)
command = add_no_notify(command)
process = Popen(command, stdout=PIPE, stderr=PIPE, close_fds=True,
env=os.environ)
stdout_text = ""
stderr_text = ""
stdout_index = 0
make_non_block(process.stdout)
make_non_block(process.stderr)
while True:
try:
rd_fd = [process.stdout.fileno(), process.stderr.fileno()]
ready = select.select(rd_fd, [], [], 2)
for r in ready[0]:
if r == process.stdout.fileno():
stdout_text += read_decoded(process.stdout)
elif r == process.stderr.fileno():
stderr_text += read_decoded(process.stderr)
if line_cb is not None:
# Process the callback for each line read!
while True:
i = stdout_text.find("\n", stdout_index)
if i != -1:
try:
line_cb(cb_data, stdout_text[stdout_index:i])
except:
st = traceback.format_exc()
log_error("call_lvm: line_cb exception: \n %s" % st)
stdout_index = i + 1
else:
break
# Check to see if process has terminated, None when running
if process.poll() is not None:
break
except IOError as ioe:
log_debug("call_lvm:" + str(ioe))
pass
if debug or process.returncode != 0:
_debug_c(command, process.returncode, (stdout_text, stderr_text))
return process.returncode, stdout_text, stderr_text
def _read_until_prompt(self, no_output=False):
stdout = ""
report = ""
stderr = ""
keep_reading = True
extra_passes = 3
report_json = {}
prev_report_len = 0
# Try reading from all FDs to prevent one from filling up and causing
# a hang. Keep reading until we get the prompt back and the report
# FD does not contain valid JSON
while keep_reading:
try:
rd_fd = [
self.lvm_shell.stdout.fileno(),
self.report_stream.fileno(),
self.lvm_shell.stderr.fileno()]
ready = select.select(rd_fd, [], [], 2)
for r in ready[0]:
if r == self.lvm_shell.stdout.fileno():
stdout += LVMShellProxy._read(self.lvm_shell.stdout)
elif r == self.report_stream.fileno():
report += LVMShellProxy._read(self.report_stream)
elif r == self.lvm_shell.stderr.fileno():
stderr += LVMShellProxy._read(self.lvm_shell.stderr)
# Check to see if the lvm process died on us
if self.lvm_shell.poll():
raise Exception(self.lvm_shell.returncode, "%s" % stderr)
if stdout.endswith(SHELL_PROMPT):
if no_output:
keep_reading = False
else:
cur_report_len = len(report)
if cur_report_len != 0:
# Only bother to parse if we have more data
if prev_report_len != cur_report_len:
prev_report_len = cur_report_len
# Parse the JSON if it's good we are done,
# if not we will try to read some more.
try:
report_json = json.loads(report)
keep_reading = False
except ValueError:
pass
if keep_reading:
extra_passes -= 1
if extra_passes <= 0:
if len(report):
raise ValueError("Invalid json: %s" %
report)
else:
raise ValueError(
"lvm returned no JSON output!")
except IOError as ioe:
log_debug(str(ioe))
pass
return stdout, report_json, stderr
