Public bug reported:
https://github.com/openstack/nova/blob/master/nova/virt/libvirt/imagebackend.py#L307
is incorrect, we need `-n` to specify the filename in order to detect
potential error
some test result, the file system is not able to fallocate so 2nd result
is expected
```
>>> from oslo_concurrency import processutils
>>> processutils.trycmd('fallocate', '-l', '1', "/gpfs/renpei_gpfs/icic/test/f")
('', '')
>>> a, b = processutils.trycmd('fallocate', '-l', '1',
>>> "/gpfs/renpei_gpfs/icic/test/f")
>>> a
''
>>> b
''
>>> can_fallocate = not err
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'err' is not defined
>>> can_fallocate = not b
>>> can_fallocate
True
```
```
>>> from oslo_concurrency import processutils
>>> processutils.trycmd('fallocate', '-l', '1', "-n",
>>> "/gpfs/renpei_gpfs/icic/test/f")
('', "Unexpected error while running command.\nCommand: fallocate -l 1 -n
/gpfs/renpei_gpfs/icic/test/f\nExit code: 1\nStdout: ''\nStderr: 'fallocate:
fallocate failed: keep size mode is unsupported\\n'")
>>> a,b = processutils.trycmd('fallocate', '-l', '1', "-n",
>>> "/gpfs/renpei_gpfs/icic/test/f")
>>> can_fallocate = not b
>>> can_fallocate
False
```
** Affects: nova
Importance: Undecided
Status: New
--
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Engineering Team, which is subscribed to OpenStack Compute (nova).
https://bugs.launchpad.net/bugs/2019463
Title:
processutils.trycmd('fallocate', '-l', '1', filepath) incorrect
Status in OpenStack Compute (nova):
New
Bug description:
https://github.com/openstack/nova/blob/master/nova/virt/libvirt/imagebackend.py#L307
is incorrect, we need `-n` to specify the filename in order to detect
potential error
some test result, the file system is not able to fallocate so 2nd
result is expected
```
>>> from oslo_concurrency import processutils
>>> processutils.trycmd('fallocate', '-l', '1',
"/gpfs/renpei_gpfs/icic/test/f")
('', '')
>>> a, b = processutils.trycmd('fallocate', '-l', '1',
"/gpfs/renpei_gpfs/icic/test/f")
>>> a
''
>>> b
''
>>> can_fallocate = not err
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'err' is not defined
>>> can_fallocate = not b
>>> can_fallocate
True
```
```
>>> from oslo_concurrency import processutils
>>> processutils.trycmd('fallocate', '-l', '1', "-n",
"/gpfs/renpei_gpfs/icic/test/f")
('', "Unexpected error while running command.\nCommand: fallocate -l 1 -n
/gpfs/renpei_gpfs/icic/test/f\nExit code: 1\nStdout: ''\nStderr: 'fallocate:
fallocate failed: keep size mode is unsupported\\n'")
>>> a,b = processutils.trycmd('fallocate', '-l', '1', "-n",
"/gpfs/renpei_gpfs/icic/test/f")
>>> can_fallocate = not b
>>> can_fallocate
False
```
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