Bug 1370002

Summary:	vgchange --addtag completes without error but queried tag value does not match
Product:	[Fedora] Fedora	Reporter:	Tony Asleson <tasleson>
Component:	lvm2	Assignee:	LVM and device-mapper development team <lvm-team>
Status:	CLOSED WONTFIX	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	rawhide	CC:	agk, anprice, bmarzins, bmr, heinzm, jonathan, lvm-team, msnitzer, prajnoha, prockai, teigland, zkabelac
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Last Closed:	2016-08-26 14:38:49 UTC	Type:	Bug
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
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Description Tony Asleson 2016-08-25 03:14:06 UTC

Description of problem:

# vgchange test --addtag "--h/K.6g0A4FOEatf3+k_nI/Yp&L_u2oy-=j649x:+dUcYWPEo6.IWT0c"
  Volume group "test" successfully changed
[root@localhost dbus]# vgs -o+tags
  VG   #PV #LV #SN Attr   VSize  VFree  VG Tags                                                 
  test   1   0   0 wz--n- 16.00g 16.00g --h/K.6g0A4FOEatf3+k_nI/Yp&L_u2oy=j649x:+dUcYWPEo6.IWT0c


The tags do not match
--h/K.6g0A4FOEatf3+k_nI/Yp&L_u2oy-=j649x:+dUcYWPEo6.IWT0c
--h/K.6g0A4FOEatf3+k_nI/Yp&L_u2oy=j649x:+dUcYWPEo6.IWT0c

Version-Release number of selected component (if applicable):

F24 & Rawhide both exhibit same behavior

How reproducible:
100%

Steps to Reproduce:
See problem description

Actual results:
Tag added != tag retrieved

Expected results:
Tag added == tag retrieved

Additional info:

Comment 1 David Teigland 2016-08-26 14:19:53 UTC

any argv lvm sees that starts with -- is de-hypenated before matching with known options, so the '-' in the middle is removed.

Comment 2 Zdenek Kabelac 2016-08-26 14:27:54 UTC

so we surely need to 'dehyphen' only options - not their args.

Comment 3 David Teigland 2016-08-26 14:38:49 UTC

when using unusual tag names like this, either one of the following forms would work:

--addtag=--h/K.6g0A4FOEatf3+k_nI/Yp&L_u2oy-=j649x:+dUcYWPEo6.IWT0c
--addtag @--h/K.6g0A4FOEatf3+k_nI/Yp&L_u2oy-=j649x:+dUcYWPEo6.IWT0c

Comment 4 Alasdair Kergon 2016-08-26 20:35:19 UTC

(In reply to Zdenek Kabelac from comment #2)
> so we surely need to 'dehyphen' only options - not their args.

That's hard.  There are some easy improvements we could make though, like not touching items that don't have the right characteristics to be arguments.

Comment 5 Zdenek Kabelac 2016-08-26 20:41:45 UTC

We should just keep args in both forms hyphened and de-hyphened - and use the right one for option and for its arg