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Latest upstream build of lvm results in the following error when
trying to use lvmshell.
"Argument --reportformat cannot be used in interactive mode.,
Error during parsing of command line."
When lvm is compiled with editline, if the file descriptors don't look like
a tty, then no "lvm> " prompt is done. Having lvm output the shell prompt
when consuming JSON on a report file descriptor is very useful in
determining if lvm command is complete.
Historically we have seen a few different errors which occur when we call
fullreport. Failing exit code and JSON which is missing one or more keys.
Instruct lvm to dump the debug to a file during fullreport calls when we
fork & exec lvm. If we encounter an error, ouput the debug data.
The reason this isn't being done when lvmshell is used is because we
don't have an easy way to test the error paths.
This change is complicated by the following:
1. We don't know if fullreport was good until we evaluate all the JSON.
This is done a bit after we have called into lvm and returned.
2. We don't want to orphan the debug file used by lvm if the daemon is
killed. Thus we try to minimize the window where the debug file hasn't
already been unlinked. A RFE to pass an open FD to lvm for this
purpose is outstanding.
The temp. file is:
-rw------. 1 root root /tmp/lvmdbusd.lvm.debug.XXXXXXXX.log
Introduce an exception which is used for known existing issues with lvm.
This is used to distinguish between errors between lvm itself and lvmdbusd.
In the case of lvm bugs, when we simply retry the operation we will log
very little. Otherwise, we will dump a full traceback for investigation
when we do the retry.
Instead of lumping all the exceptions, break them out to handle the dbus
exceptions separately, to reduce the amount of debug information that ends
up in the journal that has questionable value.
Lvm occasionally fails to return all the request JSON keys in the output of
"fullreport". This happens very rarely. When it does the daemon was reporting
the resulting informational exception:
MThreadRunner: exception
Traceback (most recent call last):
File "/usr/lib/python3.9/site-packages/lvmdbusd/utils.py", line 667, in _run
self.rc = self.f(*self.args)
File "/usr/lib/python3.9/site-packages/lvmdbusd/fetch.py", line 40, in _main_thread_load
(lv_changes, remove) = load_lvs(
File "/usr/lib/python3.9/site-packages/lvmdbusd/lv.py", line 143, in load_lvs
return common(
File "/usr/lib/python3.9/site-packages/lvmdbusd/loader.py", line 37, in common
objects = retrieve(search_keys, cache_refresh=False)
File "/usr/lib/python3.9/site-packages/lvmdbusd/lv.py", line 95, in lvs_state_retrieve
l['vdo_operating_mode'],
KeyError: 'vdo_operating_mode'
The daemon retries the operation, which usually works and the daemon continues.
However, simply reporting this informational stack trace is causing CI and other
automated tests to fail as they expect no tracebacks in the log output.
Remove the reporting of this code path unless it persists and causes the daemon
to give up and exit.
Ref: https://bugzilla.redhat.com/show_bug.cgi?id=2120267
When the daemon isn't started with --debug we will keep a circular
buffer of the past N number of debug messages which we will output
when we encounter an issue.
Rather than trying to bubble up return codes that get us to exit cleanly
it's better to just raise an exception to bail. In some cases functions
don't have return codes, so they cannot be checked.
We were incorrectly only setting this if --udev wasn't present on the
command line. In all cases when we see a manager.ExternalEvent we want
to set this.
Depending on when an occurs, it maynot have any information available for
lastlog. In this case try to grab an error message from the original
response.
Introduce a new lock for the flight recorder, so that we can dump it when
a command is block waiting for lvm to complete. Also in all paths we will
addthe metadata to the flight recorder before it's done, so we will have
it when a command hangs and we dump the flight recorder. Add the missing
bits after the command has finished.
Cleaned up the output too.
