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Fix check-mode incorrectly returning changed (#2220)

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The lvol module has a different logic in check-mode for knowing when a change is induced. And this logic is *only* based on a size check. However during a normal run, it is the lvreduce or lvextend tool that decides when a change is performed (or when the requested and existing sizes differ). So while in check-mode the module reports a change, in real run-mode it does not in fact changes anything an reports ok.

One solution would be to implement the exact size-comparison logic that is implemented in lvextend and lvreduce, but we opted to use the `--test` option to each command to verify if a change is induced or not. In effect both check-mode and run-mode use the exact same logic and conclusion.
This commit is contained in:
Dag Wieers 2016-05-14 10:40:49 +02:00 committed by René Moser
parent f953d5dc0c
commit 7618fd8749
1 changed files with 36 additions and 37 deletions
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31
system/lvol.py
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@ -214,6 +214,12 @@ def main():
if opts is None:
opts = ""
# Add --test option when running in check-mode
if module.check_mode:
test_opt = ' --test'
else:
test_opt = ''
if size:
# LVCREATE(8) -l --extents option with percentage
if '%' in size:
@ -297,14 +303,11 @@ def main():
if this_lv is None:
if state == 'present':
### create LV
if module.check_mode:
changed = True
else:
lvcreate_cmd = module.get_bin_path("lvcreate", required=True)
if snapshot is not None:
cmd = "%s %s -%s %s%s -s -n %s %s %s/%s" % (lvcreate_cmd, yesopt, size_opt, size, size_unit, snapshot, opts, vg, lv)
cmd = "%s %s %s -%s %s%s -s -n %s %s %s/%s" % (lvcreate_cmd, test_opt, yesopt, size_opt, size, size_unit, snapshot, opts, vg, lv)
else:
cmd = "%s %s -n %s -%s %s%s %s %s %s" % (lvcreate_cmd, yesopt, lv, size_opt, size, size_unit, opts, vg, pvs)
cmd = "%s %s %s -n %s -%s %s%s %s %s %s" % (lvcreate_cmd, test_opt, yesopt, lv, size_opt, size, size_unit, opts, vg, pvs)
rc, _, err = module.run_command(cmd)
if rc == 0:
changed = True
@ -313,12 +316,10 @@ def main():
else:
if state == 'absent':
### remove LV
if module.check_mode:
module.exit_json(changed=True)
if not force:
module.fail_json(msg="Sorry, no removal of logical volume %s without force=yes." % (this_lv['name']))
lvremove_cmd = module.get_bin_path("lvremove", required=True)
rc, _, err = module.run_command("%s --force %s/%s" % (lvremove_cmd, vg, this_lv['name']))
rc, _, err = module.run_command("%s %s --force %s/%s" % (lvremove_cmd, test_opt, vg, this_lv['name']))
if rc == 0:
module.exit_json(changed=True)
else:
@ -349,10 +350,7 @@ def main():
tool = '%s %s' % (tool, '--force')
if tool:
if module.check_mode:
changed = True
else:
cmd = "%s -%s %s%s %s/%s %s" % (tool, size_opt, size, size_unit, vg, this_lv['name'], pvs)
cmd = "%s %s -%s %s%s %s/%s %s" % (tool, test_opt, size_opt, size, size_unit, vg, this_lv['name'], pvs)
rc, out, err = module.run_command(cmd)
if "Reached maximum COW size" in out:
module.fail_json(msg="Unable to resize %s to %s%s" % (lv, size, size_unit), rc=rc, err=err, out=out)
@ -361,6 +359,8 @@ def main():
msg="Volume %s resized to %s%s" % (this_lv['name'], size_requested, unit)
elif "matches existing size" in err:
module.exit_json(changed=False, vg=vg, lv=this_lv['name'], size=this_lv['size'])
elif "not larger than existing size" in err:
module.exit_json(changed=False, vg=vg, lv=this_lv['name'], size=this_lv['size'], msg="Original size is larger than requested size", err=err)
else:
module.fail_json(msg="Unable to resize %s to %s%s" % (lv, size, size_unit), rc=rc, err=err)
@ -379,10 +379,7 @@ def main():
tool = '%s %s' % (tool, '--force')
if tool:
if module.check_mode:
changed = True
else:
cmd = "%s -%s %s%s %s/%s %s" % (tool, size_opt, size, size_unit, vg, this_lv['name'], pvs)
cmd = "%s %s -%s %s%s %s/%s %s" % (tool, test_opt, size_opt, size, size_unit, vg, this_lv['name'], pvs)
rc, out, err = module.run_command(cmd)
if "Reached maximum COW size" in out:
module.fail_json(msg="Unable to resize %s to %s%s" % (lv, size, size_unit), rc=rc, err=err, out=out)
@ -390,6 +387,8 @@ def main():
changed = True
elif "matches existing size" in err:
module.exit_json(changed=False, vg=vg, lv=this_lv['name'], size=this_lv['size'])
elif "not larger than existing size" in err:
module.exit_json(changed=False, vg=vg, lv=this_lv['name'], size=this_lv['size'], msg="Original size is larger than requested size", err=err)
else:
module.fail_json(msg="Unable to resize %s to %s%s" % (lv, size, size_unit), rc=rc, err=err)