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When a LV loses an interface it ends up getting removed and recreated.
This happens after the VGs have been processed and updated. Thus when
this happens we need to re-check the VGs.
VDO pool LVs are represented by a new dbus interface VgVdo. Currently
the interface only has additional VDO properties, but when the
ability to support additional LV creation is added we can add a method
to the interface.
With Python 3.8 converting these directly to string using str()
no longer works, we need to convert these to integer first.
On Python 3.8:
>>> str(dbus.Int64(1))
'dbus.Int64(1)'
On Python 3.7 (and older):
>>> str(dbus.UInt64(1))
'1'
This is probably related to removing __str__ function from method
from int (dbus.UInt is subclass of int) which happened in 3.8, see
https://docs.python.org/3.8/whatsnew/3.8.html
Signed-off-by: Vojtech Trefny <vtrefny@redhat.com>
Lvm can at times have duplicate names. When this happens the daemon will
internally use vg_name:vg_uuid as the name for lookups, but display just
the vg_name externally. If an API user uses the Manager.LookUpByLvmId and
queries the vg name they will only get returned one result as the API
can only accommodate returning 1. The one returned is the first instance
found when sorting the volume groups by UUID.
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1583510
When we have two logical volumes which switch their names at the
same time we are left with incorrect lookups. Anytime we find
an entry by doing a lookup by UUID or by name we will ensure
that the lookups are indeed correct.
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1642176
When a VG is exported, the 'fullreport' returns an exit code of 5, but
otherwise returns the data we are wanting.
Signed-off-by: Tony Asleson <tasleson@redhat.com>
In some cases we get stuck where we are unable to retrieve the current
state of lvm as we are encountering an error. When the error is
persistent we will log and exit the daemon instead of consuming vast
amounts of resources.
Signed-off-by: Tony Asleson <tasleson@redhat.com>
If we don't know the meaning we will return the key with default text
instead of raising an exception and taking the daemon out in the
process.
Resolves: rhbz1657950
When we get bug reports we may not get the entire log, so lets
dump the fight recorder from newest to oldest as the one we
are interested in was likely to be the last command run.
lvmdbusd executable script must use python3 interpreter detected by
configure script, as site-packages directory used for library is only
used by that interpreter.
If you send a SIGUSR1 (10) to the daemon it will dump all the
threads current stacks to stdout. This will be useful when the
daemon is apparently hung and not processing requests.
eg.
$ sudo kill -10 <daemon pid>
Make sure that any and all code that executes in the main thread is
wrapped with a try/except block to ensure that at the very least
we log when things are going wrong.
In some cases we are seeing where there are no VGs, but the data returned from
lvm shows that the PVs have the following for the VG:
"vg_name":"[unknown]", "vg_uuid":""
The code was only checking for the exitence of the VG name and we called into
the function get_object_path_by_uuid_lvm_id which requires both the VG name and
the LV name to exist (asserts this) which results in the following stack trace:
Traceback (most recent call last):
File "/home/tasleson/lvm2/daemons/lvmdbusd/utils.py", line 563, in runner
obj._run()
File "/home/tasleson/lvm2/daemons/lvmdbusd/utils.py", line 584, in _run
self.rc = self.f(*self.args)
File "/home/tasleson/lvm2/daemons/lvmdbusd/fetch.py", line 26, in
_main_thread_load
cache_refresh=False)[1]
File "/home/tasleson/lvm2/daemons/lvmdbusd/pv.py", line 48, in load_pvs
emit_signal, cache_refresh)
File "/home/tasleson/lvm2/daemons/lvmdbusd/loader.py", line 37, in common
objects = retrieve(search_keys, cache_refresh=False)
File "/home/tasleson/lvm2/daemons/lvmdbusd/pv.py", line 40, in
pvs_state_retrieve
p["pv_attr"], p["pv_tags"], p["vg_name"], p["vg_uuid"]))
File "/home/tasleson/lvm2/daemons/lvmdbusd/pv.py", line 84, in __init__
vg_uuid, vg_name, vg_obj_path_generate)
File "/home/tasleson/lvm2/daemons/lvmdbusd/objectmanager.py", line 318,
in get_object_path_by_uuid_lvm_id
assert uuid
AssertionError
When executing in the main thread, if we encounter an exception we
will bypass the notify_all call on the condition and the calling thread
never wakes up.
@staticmethod
def runner(obj):
# noinspection PyProtectedMember
Exception thrown here
----> obj._run()
So the following code doesn't run, which causes calling thread to hang
with obj.cond:
obj.function_complete = True
obj.cond.notify_all()
Additionally for some unknown reason the stderr is lost.
Best guess is it's something to do with scheduling a python function
into the GLib.idle_add. That made finding issue quite difficult.
If during the process of fetching current lvm state we experience an
exception we fail to call set_result on the queued_requests we were
processing. When this happens those threads block forever which causes
the service to stall infinitely. Only clear the queued_requests after
we have called set_result.
We were not adding background tasks to flight recorder. Add the meta
data to the flight recorder when we start the command and update the meta
data when the command is finished. Locking was added to meta data to
prevent concurrent update and returning string representation as these can
happen in two different threads.
vgreduce previously allowed --all and --removemissing together even though
it only actual did the remove missing. The lvm dbus daemon was passing
--all anytime there was no entries in pv_object_paths. This change supplies
--all if and only if we are not removing missing and the pv_object_paths
is empty.
Vgreduce has and continues to enforce the invalid combination of supplying a
device list when you specify --all or --removemissing so we do not need
to check for that invalid combination explicitly in the lvm dbus service as
it's already covered.
Ref: https://bugzilla.redhat.com/show_bug.cgi?id=1455471
